WO2012115252A1 - 二次電池用多孔膜、二次電池多孔膜用スラリー及び二次電池 - Google Patents
二次電池用多孔膜、二次電池多孔膜用スラリー及び二次電池 Download PDFInfo
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- WO2012115252A1 WO2012115252A1 PCT/JP2012/054653 JP2012054653W WO2012115252A1 WO 2012115252 A1 WO2012115252 A1 WO 2012115252A1 JP 2012054653 W JP2012054653 W JP 2012054653W WO 2012115252 A1 WO2012115252 A1 WO 2012115252A1
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- Prior art keywords
- secondary battery
- group
- porous membrane
- meth
- slurry
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- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
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- FBCQUCJYYPMKRO-UHFFFAOYSA-N prop-2-enyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCC=C FBCQUCJYYPMKRO-UHFFFAOYSA-N 0.000 description 1
- QTECDUFMBMSHKR-UHFFFAOYSA-N prop-2-enyl prop-2-enoate Chemical compound C=CCOC(=O)C=C QTECDUFMBMSHKR-UHFFFAOYSA-N 0.000 description 1
- BOQSSGDQNWEFSX-UHFFFAOYSA-N propan-2-yl 2-methylprop-2-enoate Chemical compound CC(C)OC(=O)C(C)=C BOQSSGDQNWEFSX-UHFFFAOYSA-N 0.000 description 1
- LYBIZMNPXTXVMV-UHFFFAOYSA-N propan-2-yl prop-2-enoate Chemical compound CC(C)OC(=O)C=C LYBIZMNPXTXVMV-UHFFFAOYSA-N 0.000 description 1
- BWJUFXUULUEGMA-UHFFFAOYSA-N propan-2-yl propan-2-yloxycarbonyloxy carbonate Chemical compound CC(C)OC(=O)OOC(=O)OC(C)C BWJUFXUULUEGMA-UHFFFAOYSA-N 0.000 description 1
- FVSKHRXBFJPNKK-UHFFFAOYSA-N propionitrile Chemical compound CCC#N FVSKHRXBFJPNKK-UHFFFAOYSA-N 0.000 description 1
- NHARPDSAXCBDDR-UHFFFAOYSA-N propyl 2-methylprop-2-enoate Chemical compound CCCOC(=O)C(C)=C NHARPDSAXCBDDR-UHFFFAOYSA-N 0.000 description 1
- PNXMTCDJUBJHQJ-UHFFFAOYSA-N propyl prop-2-enoate Chemical compound CCCOC(=O)C=C PNXMTCDJUBJHQJ-UHFFFAOYSA-N 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical class CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
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- HNJBEVLQSNELDL-UHFFFAOYSA-N pyrrolidin-2-one Chemical compound O=C1CCCN1 HNJBEVLQSNELDL-UHFFFAOYSA-N 0.000 description 1
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- MHSKRLJMQQNJNC-UHFFFAOYSA-N terephthalamide Chemical compound NC(=O)C1=CC=C(C(N)=O)C=C1 MHSKRLJMQQNJNC-UHFFFAOYSA-N 0.000 description 1
- OPQYOFWUFGEMRZ-UHFFFAOYSA-N tert-butyl 2,2-dimethylpropaneperoxoate Chemical compound CC(C)(C)OOC(=O)C(C)(C)C OPQYOFWUFGEMRZ-UHFFFAOYSA-N 0.000 description 1
- SJMYWORNLPSJQO-UHFFFAOYSA-N tert-butyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OC(C)(C)C SJMYWORNLPSJQO-UHFFFAOYSA-N 0.000 description 1
- ISXSCDLOGDJUNJ-UHFFFAOYSA-N tert-butyl prop-2-enoate Chemical compound CC(C)(C)OC(=O)C=C ISXSCDLOGDJUNJ-UHFFFAOYSA-N 0.000 description 1
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- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
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- VPYJNCGUESNPMV-UHFFFAOYSA-N triallylamine Chemical compound C=CCN(CC=C)CC=C VPYJNCGUESNPMV-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/443—Particulate material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/417—Polyolefins
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/42—Acrylic resins
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/423—Polyamide resins
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/446—Composite material consisting of a mixture of organic and inorganic materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M50/491—Porosity
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a porous membrane, and more specifically, formed on the surface of an electrode or separator of a secondary battery such as a lithium ion secondary battery, which can be made into a thin film, improving the slidability of the electrode or separator, and battery safety.
- the present invention relates to a porous membrane that can contribute to maintenance and improvement.
- the present invention also relates to a slurry for a porous membrane for forming such a porous membrane.
- this invention relates to the secondary battery which comprises the electrode or separator provided with this porous film.
- lithium ion secondary batteries exhibit the highest energy density, and are often used especially for small electronics. In addition to small-sized applications, development for automobiles is also expected. Among them, there is a demand for higher capacity and longer life of lithium ion secondary batteries and further improvement of safety.
- Patent Document 1 discloses a porous film having plate-like particles as insulating fine particles and a binder having a breaking elongation of 300% or more. According to Patent Document 1, since the plate-like particles are oriented in this porous film, it is superior in safety to the use of spherical particles, and further, a binder having a breaking elongation of 300% or more is used. Therefore, it is described that the porous film is also excellent in elongation.
- the porous film described in Patent Document 1 does not become a uniform film when thinned, has low slidability, and has a manufacturing process for electrodes and separators, particularly electrodes. It was found that non-conductive particles are detached from the porous membrane when wound, and powder falling becomes a problem.
- the plate-like particles increase the viscosity of the slurry for forming the porous film, making it difficult to reduce the thickness of the porous film. Further, the plate-like particles themselves are inferior in dispersibility in the slurry. For this reason, it has been difficult to obtain a uniform porous thin film using a slurry containing plate-like particles.
- the present invention has been made in view of the above-described conventional technology, and even when plate-like particles are used as non-conductive particles, thinning is possible and no powder falls off.
- the object is to provide a porous membrane.
- Another object of the present invention is to provide a slurry having high storage stability for forming such a porous membrane.
- a further object of the present invention is to provide a secondary battery having such a porous membrane.
- the slurry for a porous membrane described in Patent Document 1 has a high viscosity and a low storage stability. As a result of diligent investigations to solve the above problems, the present inventors tend to settle when plate-like particles are used as non-conductive particles. Therefore, when producing a porous film using this slurry, it is bound during the drying process. It was found that the agent was unevenly distributed, and as a result, there were problems such as powder falling off from the resulting porous membrane. Furthermore, it was found that the slurry for the porous film described in Patent Document 1 has a slurry property that is not suitable for thinning and coating properties, and thinning and high-speed coating are difficult.
- the present inventors have determined that a non-conductive particle having a specific shape, a binder having a specific monomer unit, a water-soluble polymer having a sulfonic acid group, and a porous film containing water
- the orientation of the non-conductive particles in the porous film is improved, the slidability is further improved, and the porous film is wound at the same time as the electrode, separator, etc.
- the present inventors have found that powder falling is suppressed and the cycle characteristics of a secondary battery including the porous film are improved. Furthermore, since the orientation of the non-conductive particles is increased, it has been found that the safety when the film is thinned can be improved, and the present invention has been completed.
- the present invention for solving the above-mentioned problems includes the following matters as a gist. (1) comprising non-conductive particles, a binder and a water-soluble polymer;
- a gist. (1) comprising non-conductive particles, a binder and a water-soluble polymer;
- the triaxial diameter of the non-conductive particles is defined as a major axis L, a thickness t, and a width b
- the major axis L is 0.1 to 20 ⁇ m
- the ratio (b / t) between the width b and the thickness t is 1.
- the binder is a copolymer containing a (meth) acrylonitrile monomer unit and a (meth) acrylic acid ester monomer unit, A porous film for a secondary battery, wherein the water-soluble polymer contains a sulfonic acid group and has a weight average molecular weight of 1,000 to 15,000.
- the amount of the repeating unit having the sulfonic acid in the water-soluble polymer is from 25% by weight to 90% by weight in terms of the amount of the sulfonic acid group-containing monomer.
- the content of the binder is 0.1 to 20 parts by mass with respect to 100 parts by mass of the non-conductive particles
- porous membrane for a secondary battery according to any one of (1) to (8), further comprising a nonionic surfactant having a cloud point of 30 to 90 ° C.
- the binder is a copolymer containing a (meth) acrylonitrile monomer unit and a (meth) acrylic acid ester monomer unit, A slurry for a secondary battery porous membrane, wherein the water-soluble polymer contains a sulfonic acid group and has a weight average molecular weight of 1,000 to 15,000.
- the copolymer includes a heat-crosslinkable crosslinkable group, and the heat-crosslinkable crosslinkable group is at least one selected from the group consisting of an epoxy group, an N-methylolamide group, and an oxazoline group.
- the slurry for a porous membrane for a secondary battery according to any one of (10) to (13).
- a secondary battery separator having the porous film according to any one of (1) to (9) on an organic separator.
- a secondary battery comprising a positive electrode, a negative electrode, a separator, and an electrolytic solution, wherein at least one of the positive electrode and the negative electrode is the electrode for a secondary battery according to (15).
- a secondary battery comprising a positive electrode, a negative electrode, a separator, and an electrolytic solution, wherein the separator is the secondary battery separator according to (16).
- the non-conductive particles are uniformly dispersed, can be thinned, and have high slidability.
- a porous membrane with less dusting is provided.
- the porous membrane has a high dispersibility of non-conductive particles, is hard to thicken, has excellent storage stability, can be applied at high speed, and has less powder falling off. Can be easily formed.
- porous membrane for a secondary battery the slurry for a secondary battery porous membrane, and the secondary battery of the present invention will be described in order.
- porous membrane for secondary battery The porous membrane for a secondary battery of the present invention (hereinafter sometimes referred to as “porous membrane”) is a porous membrane installed between a positive electrode and a negative electrode of a secondary battery, and is a non-conductive particle.
- a binder and a water-soluble polymer The porous film can be used by being laminated on a separator or an electrode, or can be used as a separator itself.
- the slurry for the porous film is formed by dispersing non-conductive particles, a binder and a water-soluble polymer in water.
- the major axis L is 0.1 to 20 ⁇ m when the triaxial diameter is the major axis L, the thickness t, and the width b, and the ratio of the width b to the thickness t (b / t ) Is used in the range of 1.5 to 100.
- the triaxial diameter of the non-conductive particles can be determined by the following method.
- Each dimension of the triaxial diameter is measured by capturing non-conductive particles as a rectangular parallelepiped by the following method. That is, consider a rectangular box with a triaxial diameter that just fits one non-conductive particle, the longest length of this box is the long diameter L, and this non-conductive with thickness t and width b. It is defined as the particle size.
- the dimensions have a relationship of L> b ⁇ t, and the larger of b and t is defined as the width b unless otherwise the same.
- observation is performed at a magnification of 10,000 to 20,000 times, and L, b, and t of the nonconductive particles are directly measured from the printed photograph.
- the length of 300 nonconductive particles is randomly measured and averaged to define the triaxial diameter of the nonconductive particles.
- the average values of L, b, and t measured in any group of 300 non-conductive particles randomly selected should satisfy the numerical range described later.
- the ratio (b / t) between the width b and the thickness t of the nonconductive particles is 1.5 to 100, preferably 3 to 100, more preferably 5 to 100.
- the major axis L of the nonconductive particles is 0.1 ⁇ m to 20 ⁇ m, preferably 0.2 ⁇ m to 15 ⁇ m, and more preferably 0.5 ⁇ m to 10 ⁇ m.
- the ratio of the major axis L to the width b (L / b) of the nonconductive particles is preferably 1 to 100, more preferably 1 to 20, and particularly preferably 1 to 10.
- the material As a material constituting the non-conductive particles, it is desired that the material is stably present under the usage environment of the lithium ion secondary battery and is electrochemically stable.
- various non-conductive inorganic particles and organic particles can be used.
- oxide particles such as iron oxide, silicon oxide, aluminum oxide, magnesium oxide, and titanium oxide; nitride particles such as aluminum nitride and boron nitride; covalently bonded crystal particles such as silicon and diamond; barium sulfate, Insoluble ion crystal particles such as calcium fluoride and barium fluoride are used. These particles may be subjected to element substitution, surface treatment, or solid solution as necessary, and may be used alone or in combination of two or more. Among these, oxide particles are preferable from the viewpoints of stability in an electrolytic solution and potential stability.
- the organic particles particles made of various polymers such as polystyrene, polyethylene, polyimide, melamine resin, phenol resin and the like are used.
- the resin forming the particles may be a mixture of the above polymers, a modified body, a derivative, a random copolymer, an alternating copolymer, a graft copolymer, a block copolymer, a crosslinked body, or the like.
- conductive metal such as carbon black, graphite, SnO 2 , ITO, metal powder, and fine powder of conductive compounds and oxides with a non-conductive substance, electrical insulation can be achieved. It can also be used.
- These non-conductive particles may be used in combination of two or more.
- the average particle diameter (volume average D50 average particle diameter) of the non-conductive particles is preferably 5 nm to 10 ⁇ m, more preferably 10 nm to 5 ⁇ m.
- the average particle diameter of the non-conductive particles be in the range of 50 nm to 2 ⁇ m because the dispersion, the ease of coating, and the controllability of the voids are excellent.
- the BET specific surface area of these particles is preferably 0.9 to 200 m 2 / g from the viewpoint of suppressing the aggregation of the particles and optimizing the fluidity of the slurry. More preferably, it is ⁇ 150 m 2 / g.
- a copolymer containing a (meth) acrylonitrile monomer unit and a (meth) acrylic acid ester monomer unit is used as a binder.
- the binder is the copolymer, the porous film can be hardly deformed without showing elution into the electrolytic solution. Furthermore, it is difficult to elute while maintaining the swellability of the electrolyte even at high temperatures, and exhibits excellent high temperature characteristics. The safety of the porous membrane can be further improved by combining this with the non-conductive particles.
- This copolymer is obtained by copolymerizing at least a monomer that provides a (meth) acrylonitrile monomer unit and a monomer that provides a (meth) acrylic acid ester monomer unit.
- Examples of the monomer that gives the (meth) acrylic acid ester monomer unit include (meth) acrylic acid alkyl ester and (meth) acrylic acid ester having a functional group in the side chain.
- (meth) acrylic acid alkyl esters are preferred, and they exhibit lithium ion conductivity due to swelling in the electrolyte, and are difficult to cause bridging and aggregation due to the polymer in a small particle size dispersion.
- the number of carbon atoms of the alkyl group bonded to the non-carbonyl oxygen atom of the ester is preferably 1 to 14, more preferably 1 to 5.
- part or all of the hydrogen of the alkyl group may be a haloalkyl group substituted with a halogen such as fluorine.
- the copolymer containing the (meth) acrylonitrile monomer unit and the (meth) acrylic acid ester monomer unit and the surface functional group of the non-conductive particles Affinity is increased and a porous film with less powder falling can be obtained.
- Examples of (meth) acrylic acid alkyl esters in which the alkyl group bonded to the non-carbonyl oxygen atom has 1 to 5 carbon atoms include methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, and n-acrylate.
- Alkyl acrylates such as butyl and t-butyl acrylate; 2- (perfluoroalkyl) ethyl acrylates such as 2- (perfluorobutyl) ethyl acrylate and 2- (perfluoropentyl) ethyl acrylate; Alkyl methacrylates such as methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, and t-butyl methacrylate; and 2- (perfluorobutyl) ethyl methacrylate; Methacrylic acid 2- Methacrylate 2- (perfluoroalkyl) ethyl, such as perfluorobutyl) ethyl methacrylate 2- (perfluoroalkyl) ethyl; and the like.
- acrylic acid alkyl esters include non-carbonyl oxygen such as n-hexyl acrylate, 2-ethylhexyl acrylate, nonyl acrylate, lauryl acrylate, stearyl acrylate, cyclohexyl acrylate, and isobornyl acrylate
- Examples of the monomer giving the (meth) acrylonitrile monomer unit suitably used in the present invention include acrylonitrile and methacrylonitrile.
- the ratio of the (meth) acrylonitrile monomer unit in the copolymer to the monomer unit derived from the (meth) acrylic acid ester is preferably in the range of 1/99 to 20/80, more preferably 1/99 to 15/85, and still more preferably 1/99 to 10/90 by mass ratio.
- the total content of the (meth) acrylonitrile monomer unit and the (meth) acrylic acid ester monomer unit in the copolymer is preferably 50% by mass to 99.9% by mass, The content is more preferably from 9% by mass to 99.5% by mass, and particularly preferably from 75% by mass to 99.0% by mass.
- flexibility of a porous film can be improved by making the total content rate of the said unit in a copolymer into the said range.
- the binder used in the present invention is preferably crosslinkable by heating or energy ray irradiation.
- the crosslinking density can be adjusted by the intensity of heating or energy beam irradiation.
- the degree of swelling decreases as the crosslink density increases, the degree of swelling can be adjusted by changing the crosslink density.
- a binder that can be cross-linked by heating or energy ray irradiation can be obtained by containing a cross-linking agent in the binder and / or by containing a cross-linkable group in the copolymer constituting the binder. it can.
- a crosslinking agent containing a thermally crosslinkable group is included, and / or in the copolymer constituting the binder,
- a crosslinkable group is contained, the porous film can be cross-linked by heat treatment after the porous film is formed, and further, the dissolution in the electrolyte can be suppressed, so that a tough and flexible porous film is obtained. This is preferable.
- the cross-linking agent to be used is not particularly limited, but the effect is exhibited by an organic peroxide, heat or light.
- a crosslinking agent or the like is used.
- an organic peroxide or a crosslinking agent that exhibits an effect by heat is preferable in that it contains a thermally crosslinkable group.
- organic peroxide examples include ketone peroxides such as methyl ethyl ketone peroxide and cyclohexanone peroxide; 1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane, 2,2-bis ( peroxyketals such as t-butylperoxy) butane; hydroperoxides such as t-butyl hydroperoxide, 2,5-dimethylhexane-2,5-dihydroperoxide; dicumyl peroxide, 2, Dialkyl peroxides such as 5-dimethyl-2,5-di (t-butylperoxy) hexyne-3, ⁇ , ⁇ 'bis (t-butylperoxy-m-isopropyl) benzene: octanoyl peroxide, iso Diacyl peroxides such as butyryl peroxide; peroxydicarbonate And peroxyesters. Among these, dialkyl
- the cross-linking agent (curing agent) that exhibits an effect by heat is not particularly limited as long as it can be cross-linked by heating, but diamine, triamine or higher aliphatic polyamine, alicyclic polyamine, aromatic polyamine bisazide. , Acid anhydrides, diols, polyhydric phenols, polyamides, diisocyanates, polyisocyanates and the like.
- aliphatic polyamines such as hexamethylenediamine, triethylenetetramine, diethylenetriamine, and tetraethylenepentamine; diaminocyclohexane, 3 (4), 8 (9) -bis (aminomethyl) tricyclo [ 5.2.1.0 2,6 ] decane; 1,3- (diaminomethyl) cyclohexane, mensendiamine, isophoronediamine N-aminoethylpiperazine, bis (4-amino-3-methylcyclohexyl) methane, bis ( Alicyclic polyamines such as 4-aminocyclohexyl) methane; 4,4′-diaminodiphenyl ether, 4,4′-diaminodiphenylmethane, ⁇ , ⁇ ′-bis (4-aminophenyl) -1,3-diisopropylbenzene, ⁇ , ⁇ '-bis (4-aminophen
- aromatic polyamines, acid anhydrides, polyhydric phenols and polyhydric alcohols are preferred for reasons such as excellent strength and adhesion of the porous membrane, and among them, 4,4-diaminodiphenylmethane (aromatic Polyamines), maleic anhydride-modified norbornene resins (acid anhydrides), polyhydric phenols and the like are particularly preferable.
- a crosslinking agent that exhibits an effect by light reacts with the copolymer by irradiation with actinic rays such as ultraviolet rays such as g rays, h rays and i rays, far ultraviolet rays, x rays and electron rays, and crosslinks.
- actinic rays such as ultraviolet rays such as g rays, h rays and i rays, far ultraviolet rays, x rays and electron rays, and crosslinks.
- actinic rays such as ultraviolet rays such as g rays, h rays and i rays, far ultraviolet rays, x rays and electron rays, and crosslinks.
- actinic rays such as ultraviolet rays such as g rays, h rays and i rays, far ultraviolet rays, x rays and electron rays, and crosslinks.
- aromatic bisazide compound examples include 4,4′-diazidochalcone, 2,6-bis (4′-azidobenzal) cyclohexanone, 2,6-bis (4′-azidobenzal) 4-methylcyclohexanone, Representative examples include 4'-diazidodiphenylsulfone, 4,4'-diazidobenzophenone, 4,4'-diazidodiphenyl, 2,7-diazidofluorene, 4,4'-diazidophenylmethane, and the like. . These can be used singly or in combination of two or more.
- the photoamine generator examples include o-nitrobenzyloxycarbonyl carbamate, 2,6-dinitrobenzyloxycarbonyl carbamate or ⁇ , ⁇ -dimethyl-3,5-dimethoxybenzyloxycarbonyl of aromatic amine or aliphatic amine. Examples thereof include carbamate bodies.
- aniline cyclohexylamine, piperidine, hexamethylenediamine, triethylenetetraamine, 1,3- (diaminomethyl) cyclohexane, 4,4'-diaminodiphenyl ether, 4,4'-diaminodiphenylmethane, phenylenediamine And o-nitrobenzyloxycarbonyl carbamate compounds such as These can be used singly or in combination of two or more.
- the photoacid generator is a substance that generates Bronsted acid or Lewis acid upon irradiation with actinic rays.
- onium salts halogenated organic compounds, quinonediazide compounds, ⁇ , ⁇ -bis (sulfonyl) diazomethane series Compounds, ⁇ -carbonyl- ⁇ -sulfonyl-diazomethane compounds, sulfone compounds, organic acid ester compounds, organic acid amide compounds, organic acid imide compounds, and the like.
- These compounds that can be cleaved by irradiation with actinic rays to generate an acid may be used alone or in combination of two or more.
- cross-linking agents can be used alone or in combination of two or more.
- the blending amount of the crosslinking agent is usually 0.001 to 30 parts by mass, preferably 0.01 to 25 parts by mass, more preferably 1 to 20 parts per 100 parts by mass of the copolymer used as the binder in the present invention. It is the range of mass parts. When the amount of these cross-linking agents is within this range, the crosslinkability and the properties of the cross-linked product such as lithium conductivity in the electrolytic solution, solubility in the electrolytic solution, and strength of the porous membrane are highly balanced, which is preferable.
- cross-linking aid when a cross-linking agent is used, it is preferable to further use a cross-linking aid (curing aid) because the cross-linking property and the dispersibility of the compounding agent can be further improved.
- the crosslinking aid used in the present invention is not particularly limited, but may be a known one disclosed in JP-A No. 62-34924, for example, quinone dioxime, benzoquinone dioxime, p.
- Oxime / nitroso crosslinking aids such as nitrosophenol; maleimide crosslinking aids such as N, Nm-phenylenebismaleimide; allylic crosslinking aids such as diallyl phthalate, triallyl cyanurate, triallyl isocyanurate; Examples thereof include methacrylate-based crosslinking aids such as ethylene glycol dimethacrylate and trimethylolpropane trimethacrylate; vinyl-based crosslinking aids such as vinyltoluene, ethylvinylbenzene and divinylbenzene; Among these, allylic crosslinking auxiliaries and methacrylate crosslinking auxiliaries are preferable because they are easily dispersed uniformly.
- the addition amount of the crosslinking aid is appropriately selected depending on the type of the crosslinking agent, but is usually 0.1 to 10 parts by mass, preferably 0.2 to 5 parts by mass with respect to 1 part by mass of the crosslinking agent. If the addition amount of the crosslinking aid is too small, crosslinking is difficult to occur. Conversely, if the addition amount is too large, the lithium conductivity and water resistance of the crosslinked binder may be lowered.
- a monofunctional monomer having one olefinic double bond having a heat-crosslinkable crosslinkable group is used.
- the thermally crosslinkable group contained in the monofunctional monomer having one olefinic double bond is at least one selected from the group consisting of an epoxy group, an N-methylolamide group, and an oxazoline group.
- an epoxy group is more preferable in terms of easy adjustment of cross-linking and cross-linking density.
- the thermally crosslinkable crosslinkable group includes a monomer that provides a (meth) acrylonitrile monomer unit and a monomer that provides a (meth) acrylic acid ester monomer, It can introduce
- Examples of the monomer containing an epoxy group include a monomer containing a carbon-carbon double bond and an epoxy group, and a monomer containing a halogen atom and an epoxy group.
- Examples of the monomer containing a carbon-carbon double bond and an epoxy group include unsaturated glycidyl ethers such as vinyl glycidyl ether, allyl glycidyl ether, butenyl glycidyl ether, o-allylphenyl glycidyl ether; butadiene monoepoxide, Diene or polyene monoepoxides such as chloroprene monoepoxide, 4,5-epoxy-2-pentene, 3,4-epoxy-1-vinylcyclohexene, 1,2-epoxy-5,9-cyclododecadiene; -Alkenyl epoxides such as epoxy-1-butene, 1,2-epoxy-5-hexene, 1,2-epoxy-9-decene; glycidyl acrylate, glycidyl methacrylate, glycidyl crotonate, glycidyl
- Examples of the monomer having a halogen atom and an epoxy group include epihalohydrin such as epichlorohydrin, epibromohydrin, epiiodohydrin, epifluorohydrin, ⁇ -methylepichlorohydrin; p-chlorostyrene oxide; dibromo Phenyl glycidyl ether;
- Examples of the monomer containing an N-methylolamide group include (meth) acrylamides having a methylol group such as N-methylol (meth) acrylamide.
- Monomers containing an oxazoline group include 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, 2-vinyl-5-methyl-2-oxazoline, 2-isopropenyl-2- Examples thereof include oxazoline, 2-isopropenyl-4-methyl-2-oxazoline, 2-isopropenyl-5-methyl-2-oxazoline, 2-isopropenyl-5-ethyl-2-oxazoline and the like.
- Polyfunctional monomers having at least two olefinic double bonds include allyl acrylate or allyl methacrylate, trimethylolpropane-triacrylate, trimethylolpropane-methacrylate, dipropylene glycol diallyl ether, polyglycol diallyl ether, triglyceride Ethylene glycol divinyl ether, hydroquinone diallyl ether, tetraallyloxyethane, or other allyl or vinyl ethers of polyfunctional alcohols, tetraethylene glycol diacrylate, triallylamine, trimethylolpropane-diallyl ether, methylenebisacrylamide and / or divinylbenzene Is preferred.
- the content of the heat-crosslinkable crosslinkable group in the copolymer is preferably 0 with respect to 100% by mass of the total amount of monomers as the amount of the monomer containing the heat-crosslinkable crosslinkable group at the time of polymerization.
- the range is from 1 to 10% by mass, more preferably from 0.1 to 5% by mass.
- the content of the heat crosslinkable crosslinkable group in the copolymer can be controlled by the monomer charge ratio at the time of producing the copolymer constituting the binder.
- the thermally crosslinkable group when producing the copolymer, a monomer that provides a (meth) acrylonitrile monomer unit and a monomer that provides a (meth) acrylate monomer unit, It can introduce
- monomers having a thermally crosslinkable crosslinkable group monomers having a thermally crosslinkable crosslinkable group are preferably used. After the monomer having an epoxy group is introduced into the copolymer, a part of the epoxy group is used for crosslinking as described above. Moreover, the unreacted epoxy group that has not been used for crosslinking reacts with a water-soluble polymer containing a sulfonic acid group described later, thereby strengthening the porous film. That is, after the application of the slurry for the porous membrane, the epoxy group in the copolymer and the sulfonic acid group in the water-soluble polymer are bonded in the drying step. As a result, the porous membrane becomes stronger, reducing powder falling and the like, and improving the reliability of the battery.
- an epoxy group including a glycidyl group
- the copolymer used as a binder further includes a hydrophilic group selected from the group consisting of a carboxylic acid group, a hydroxyl group and a sulfonic acid group.
- a hydrophilic group selected from the group consisting of a carboxylic acid group, a hydroxyl group and a sulfonic acid group.
- the binder contains the hydrophilic group, so that the binder is easily adsorbed on the surface of the non-conductive particles, and the non-conductive The dispersibility of the particles is high, and a smooth porous film can be formed on the electrode mixture layer or the organic separator.
- the hydrophilic group is preferably selected from the group consisting of a carboxylic acid group, a hydroxyl group, and a sulfonic acid group. From the viewpoint of further improving the dispersibility and binding properties of the non-conductive particles, the sulfonic acid group or the carboxylic acid group Is more preferable.
- the hydrophilic group contains a monomer that gives a (meth) acrylonitrile monomer unit, a monomer that gives a (meth) acrylic acid ester monomer unit, and a hydrophilic group when producing the copolymer. And / or other monomers copolymerizable with these can be introduced by copolymerization.
- Examples of the monomer containing a carboxylic acid group include monocarboxylic acid and derivatives thereof, dicarboxylic acid, acid anhydrides thereof, and derivatives thereof.
- monocarboxylic acids examples include acrylic acid, methacrylic acid, and crotonic acid.
- Monocarboxylic acid derivatives include 2-ethylacrylic acid, 2-ethylacrylic acid, isocrotonic acid, ⁇ -acetoxyacrylic acid, ⁇ -trans-aryloxyacrylic acid, ⁇ -chloro- ⁇ -E-methoxyacrylic acid, ⁇ -Diaminoacrylic acid etc. are mentioned.
- dicarboxylic acid examples include maleic acid, fumaric acid, itaconic acid and the like.
- acid anhydride of dicarboxylic acid examples include maleic anhydride, acrylic anhydride, methyl maleic anhydride, dimethyl maleic anhydride and the like.
- Dicarboxylic acid derivatives include methyl maleic acid, dimethyl maleic acid, phenyl maleic acid, chloromaleic acid, dichloromaleic acid, fluoromaleic acid and the like methyl allyl maleate, diphenyl maleate, nonyl maleate, decyl maleate, dodecyl maleate, And maleate esters such as octadecyl maleate and fluoroalkyl maleate.
- Alkanol esters of ethylenically unsaturated carboxylic acids general formula CH 2 ⁇ CR 1 —COO— (C n H 2n O) m—H (m is an integer from 2 to 9, n is an integer from 2 to 4, R 1 Represents a hydrogen or methyl group) and esters of polyalkylene glycol and (meth) acrylic acid; Mono (meth) acrylic acid esters of dihydroxy esters of dicarboxylic acids such as 2-hydroxyethyl-2 '-(meth) acryloyloxyphthalate, 2-hydroxyethyl-2'-(meth) acryloyloxysuccinate; 2-hydroxy Vinyl ethers such as ethyl vinyl ether and 2-hydroxypropyl vinyl ether; (meth) allyl-2-hydroxyethyl ether, (meth) allyl-2-hydroxypropyl ether, (meth) allyl-3-hydroxypropyl ether, (meth) allyl Mono (meta) of al
- Examples of the monomer containing a sulfonic acid group include vinyl sulfonic acid, methyl vinyl sulfonic acid, (meth) allyl sulfonic acid, styrene sulfonic acid, (meth) acrylic acid-2-ethyl sulfonate, 2-acrylamide-2- Examples thereof include methylpropane sulfonic acid and 3-allyloxy-2-hydroxypropane sulfonic acid.
- hydrophilic group a sulfonic acid group or a carboxylic acid group is preferable from the viewpoint of further improving the dispersibility and binding property of the nonconductive particles.
- the content of the hydrophilic group in the copolymer is preferably 0.1 to 20% by mass with respect to 100% by mass of the total amount of the monomer containing the hydrophilic group at the time of polymerization.
- the range is preferably from 0.5 to 15% by mass.
- the content of the hydrophilic group in the copolymer can be controlled by the monomer charge ratio when producing the copolymer constituting the binder. When the hydrophilic group in the copolymer is within the above range, the nonconductive particles can be more favorably dispersed.
- the copolymer in addition to the monomer that gives the (meth) acrylonitrile monomer unit and the monomer that gives the (meth) acrylic acid ester monomer unit, It preferably contains a crosslinkable crosslinkable group and a hydrophilic group.
- the copolymer contains a heat-crosslinkable crosslinkable group and a hydrophilic group, the crosslink density can be easily increased, and a high-strength porous film can be easily obtained.
- the copolymer used as a binder in the present invention may contain other monomers copolymerizable with these in addition to the above monomers.
- Other monomers include styrene monomers such as styrene, chlorostyrene, vinyl toluene, methyl t-butylstyrene vinyl benzoate, vinyl naphthalene, chloromethyl styrene, ⁇ -methyl styrene, divinylbenzene; ethylene, propylene Olefins such as: Diene monomers such as butadiene and isoprene; Halogen-containing monomers such as vinyl chloride and vinylidene chloride; Vinyl esters such as vinyl acetate, vinyl propionate and vinyl butyrate; Methyl vinyl ether, Ethyl Vinyl ethers such as vinyl ether and butyl vinyl ether; vinyl ketones such as methyl vinyl ketone, ethyl vinyl ketone, butyl vinyl ket
- the content ratio of monomer units other than (meth) acrylonitrile monomer units and (meth) acrylic acid alkyl ester monomer units in the copolymer is preferably 50% by mass or less, and 40% by mass or less. More preferably, it is particularly preferably 25% by mass or less.
- the method for producing the copolymer used as the binder is not particularly limited, and any method such as a solution polymerization method, a suspension polymerization method, a bulk polymerization method, and an emulsion polymerization method can be used.
- the polymerization method any method such as ionic polymerization, radical polymerization, and living radical polymerization can be used.
- the polymerization initiator used for the polymerization include lauroyl peroxide, diisopropyl peroxydicarbonate, di-2-ethylhexyl peroxydicarbonate, t-butyl peroxypivalate, 3,3,5-trimethylhexanoyl peroxide, and the like.
- Organic peroxides, azo compounds such as ⁇ , ⁇ ′-azobisisobutyronitrile, ammonium persulfate, potassium persulfate, and the like.
- the copolymer used as the binder is preferably dispersed in water.
- the method of dispersing the copolymer used as the binder in water is not particularly limited as long as the copolymer can be dispersed in water, but the monomers constituting the copolymer such as an emulsion polymerization method are dispersed in water. Then, the copolymer may be dispersed in water by a method of polymerizing, or the copolymer dissolved in a solvent may be dispersed in water and the solvent may be dispersed in water by a method of vaporizing the solvent. In these methods, a dispersant such as a surfactant may be used as appropriate.
- the glass transition temperature of the above-mentioned copolymer used as a binder can give flexibility to the porous film at room temperature, causing cracks during winding and winding, chipping of the porous film, etc. From the viewpoint of suppression, it is preferably 15 ° C. or lower, and more preferably 0 ° C. or lower.
- the glass transition temperature of the copolymer can be adjusted by changing the use ratio of the monomer constituting the copolymer.
- the copolymer is preferably 0.1 to 20 parts by weight, more preferably 0.5 to 15 parts by weight, particularly preferably 0. 0 parts by weight with respect to 100 parts by weight of the non-conductive particles. It is contained at a ratio of 5 to 10 parts by mass. If the amount of the copolymer used in the binder is too small, the adhesion between the non-conductive particles may be insufficient, or the adhesion between the porous membrane, the electrode mixture layer, and the organic separator may be poor. May be enough. On the other hand, when there is too much usage-amount of a copolymer, the relative ratio of a nonelectroconductive particle will fall and porosity will be impaired.
- binder in addition to a copolymer containing a (meth) acrylonitrile monomer unit and a (meth) acrylic acid ester monomer unit, strength and flexibility, swellability to the electrolyte used
- other binder components may be used.
- the other binder component is not particularly limited as long as it is a binder that does not easily elute while maintaining the swelling property of the electrolyte solution at high temperatures and exhibits excellent high-temperature characteristics.
- polymer compounds such as fluoropolymers, diene polymers, acrylic polymers that do not contain (meth) acrylonitrile monomer units, polyimides, polyamides, polyurethane polymers, etc., fluorine polymers, A diene polymer or an acrylic polymer containing no (meth) acrylonitrile monomer unit is preferred.
- acrylic polymer containing no (meth) acrylonitrile monomer unit examples include polybutyl acrylate, polybutyl methacrylate, polyhydroxyethyl methacrylate, polyacrylamide, and butyl acrylate / styrene copolymer.
- Diene polymers include polybutadiene, polyisoprene, butadiene / styrene random copolymer, isoprene / styrene random copolymer, acrylonitrile / butadiene copolymer, acrylonitrile / butadiene / styrene copolymer, butadiene / styrene / block copolymer.
- Examples include polymers, styrene / butadiene / styrene / block copolymers, isoprene / styrene / block copolymers, styrene / isoprene / styrene / block copolymers, and the like.
- fluoropolymer examples include vinylidene fluoride rubber and tetrafluoroethylene-propylene rubber.
- binder components when other binder components are used in addition to a copolymer containing a (meth) acrylonitrile monomer unit and a (meth) acrylate monomer unit as a binder, these binders are used.
- the content ratio in the agent is preferably 50% by mass or less, and more preferably 30% by mass or less, with respect to the total amount of the binder.
- the total content of the binder is preferably 0.1 to 20 parts by mass, more preferably 0.5 to 15 parts by mass, particularly preferably 100 parts by mass of the non-conductive particles. Is in the range of 0.5 to 10 parts by mass.
- the total content of the binder in the porous membrane is within the above range, so that the binding property between the non-conductive particles and the binding property to the electrode mixture layer or the organic separator and the flexibility are maintained. However, an increase in resistance can be suppressed without inhibiting the movement of Li ions.
- the porous film of the present invention contains a water-soluble polymer having a sulfonic acid group in addition to the non-conductive particles and the binder.
- the water-soluble polymer is used for further improving the dispersibility of the non-conductive particles in the slurry for a porous film described later. This is presumably because the water-soluble polymer dissolved in the solvent water adsorbs on the surface of the non-conductive particles and covers the surface, thereby suppressing aggregation of the non-conductive particles.
- the slurry for porous films has improved stability over time, and the aggregated particle diameter of the non-conductive particles can greatly change even when stored for a long period of time. Few. Further, even in a porous film obtained using such a slurry, since the dispersibility of non-conductive particles is maintained, a uniform and relatively thin porous film can be obtained. Furthermore, when the porous membrane is produced, a crosslinked structure is formed with the binder due to the sulfonic acid group in the water-soluble polymer, and thereby the strength (particularly hardness) of the resulting porous membrane is further increased. can do.
- the water-soluble polymer means a polymer having an insoluble content of less than 0.5% by weight when 0.5 g of the polymer is dissolved in 100 g of water at 25 ° C.
- the copolymer used as the above-mentioned binder may contain a sulfonic acid group or the like, but has a cross-linked structure, so is insoluble in water and has an insoluble content of 0.5% by weight or more. It is.
- the water-soluble polymer has many sulfonic acid groups.
- the weight ratio of the sulfonic acid group in 100% by weight of the water-soluble polymer is preferably 1% by weight or more, more preferably 2% by weight or more, and particularly preferably 4% by weight or more.
- the sulfonic acid group of the water-soluble polymer since the sulfonic acid group of the water-soluble polymer usually undergoes a crosslinking reaction when producing the porous membrane of the present invention, a crosslinked structure is formed between the sulfonic acid group and the binder in the porous membrane of the present invention. Is done.
- the water-soluble polymer has a sufficient amount of sulfonic acid groups, the number of crosslinked structures can be increased, and the strength (particularly hardness) of the resulting porous membrane can be increased.
- the upper limit of the weight ratio of the sulfonic acid group in the water-soluble polymer is preferably 70% by weight or less, more preferably 60% by weight or less, and particularly preferably 50% by weight or less.
- the water-soluble polymer has a repeating unit having a sulfonic acid group (hereinafter referred to as “sulfonic acid unit” as appropriate).
- sulfonic acid unit examples include monomers obtained by sulfonated one of conjugated double bonds of diene compounds such as isoprene and butadiene; vinyl sulfonic acid, styrene sulfonic acid, allyl sulfonic acid, sulfone.
- Sulfonic acid group-containing monomers such as ethyl methacrylate and sulfopropyl methacrylate or salts thereof; monomers containing amide groups and sulfonic acid groups such as 2-acrylamido-2-methylpropanesulfonic acid (AMPS) A salt thereof; a monomer containing a hydroxyl group and a sulfonic acid group, such as 3-allyloxy-2-hydroxypropanesulfonic acid (HAPS), or a salt thereof;
- the water-soluble polymer may contain only one type of sulfonic acid unit, or may contain two or more types in combination at any ratio.
- the amount of the sulfonic acid unit contained in 100% by weight of the water-soluble polymer is usually 20% by weight or more, preferably 25% by weight or more, and usually 100% by weight or less, preferably the amount of the sulfonic acid group-containing monomer. 90% by weight or less.
- the water-soluble polymer preferably contains a carboxyl group (—COOH).
- —COOH carboxyl group
- the adsorption of the water-soluble polymer to the non-conductive particles can be promoted, and the dispersibility of the non-conductive particles can be further improved.
- the weight ratio of the carboxyl group in 100% by weight of the water-soluble polymer is preferably 1% by weight or more, more preferably 2% by weight or more, particularly preferably 4% by weight or more, and preferably 60% by weight or less, 50% by weight. % Or less is preferable.
- the solubility in water of the water-soluble polymer is improved by the weight ratio of the carboxyl group being equal to or more than the lower limit of the above range, and the dispersibility of the non-conductive particles can be improved by electrostatic repulsion of the carboxyl group, By being below the upper limit, the adsorptivity to the nonconductive particles is improved, and aggregation of the nonconductive particles can be prevented.
- the water-soluble polymer has a repeating unit having a carboxyl group (hereinafter referred to as “carboxyl unit” as appropriate).
- carboxyl unit a repeating unit having a carboxyl group
- monomer corresponding to the carboxyl unit include monocarboxylic acid and derivatives thereof, dicarboxylic acid and acid anhydrides thereof, and derivatives thereof.
- monocarboxylic acids include acrylic acid, methacrylic acid, crotonic acid and the like.
- Examples of monocarboxylic acid derivatives include 2-ethylacrylic acid, isocrotonic acid, ⁇ -acetoxyacrylic acid, ⁇ -trans-aryloxyacrylic acid, ⁇ -chloro- ⁇ -E-methoxyacrylic acid, ⁇ -diaminoacrylic An acid etc. are mentioned.
- Examples of dicarboxylic acids include maleic acid, fumaric acid, itaconic acid and the like.
- Examples of acid anhydrides of dicarboxylic acids include maleic anhydride, acrylic anhydride, methyl maleic anhydride, dimethyl maleic anhydride, and the like.
- dicarboxylic acid derivatives include methyl maleate such as methylmaleic acid, dimethylmaleic acid, phenylmaleic acid, chloromaleic acid, dichloromaleic acid, fluoromaleic acid; diphenyl maleate, nonyl maleate, decyl maleate, And maleate esters such as dodecyl maleate, octadecyl maleate and fluoroalkyl maleate.
- the water-soluble polymer may contain only one type of carboxyl unit, or may contain two or more types in combination at any ratio.
- the amount of carboxyl units contained in 100% by weight of the water-soluble polymer is preferably 20% by weight or more, more preferably 25% by weight or more, preferably 100% by weight or less, more preferably 90% by weight or less. By keeping the amount of the carboxyl unit in such a range, the amount of the carboxyl group can be kept in the preferred range.
- the molar ratio of the sulfonic acid group to the carboxyl group is preferably 5/95 or more, more preferably 10/90. It is above, Preferably it is 95/5 or less, More preferably, it is 90/10 or less.
- the molar ratio is equal to or higher than the lower limit of the range, the sulfonic acid group can form a crosslinked structure with the copolymer constituting the binder, thereby improving the strength of the porous film.
- the adsorptivity between the water-soluble polymer and the nonconductive particles is improved, and the dispersibility of the nonconductive particles can be improved.
- the water-soluble polymer may contain a repeating unit other than the sulfonic acid unit and the carboxyl unit as long as the effects of the present invention are not significantly impaired.
- the water-soluble polymer when the water-soluble polymer contains two or more different repeating units, the water-soluble polymer becomes a copolymer.
- the water-soluble polymer may be, for example, a random copolymer, a block copolymer, a graft copolymer, or a structure in which these are combined.
- a random copolymer is usually used because of easy production.
- the weight average molecular weight of the water-soluble polymer is 1000 or more, preferably 1500 or more, and 15000 or less, preferably 10,000 or less.
- the weight average molecular weight of the water-soluble polymer is below the lower limit of the above range, the adsorptivity of the water-soluble polymer to the non-conductive particles is lowered and the dispersibility of the non-conductive particles is also lowered.
- the weight average molecular weight of a water-soluble polymer exceeds the upper limit of the said range, a nonelectroconductive particle will be easy to aggregate on the contrary, and the stability of the slurry for porous films of this invention will fall.
- what is necessary is just to obtain
- the water-soluble polymer layer (dispersion stable layer) present on the surface of the non-conductive particles becomes sparse, and as a result, the non-conductive particles may not be stably dispersed.
- the weight average molecular weight of the water-soluble polymer is too large, adsorption may occur between a plurality of non-conductive particles, bridging aggregation may occur, and stability may be reduced.
- the weight average molecular weight of a water-soluble polymer becomes large, the viscosity of the slurry for porous membranes will rise, and the fluidity
- the amount of the water-soluble polymer contained in the porous membrane of the present invention is preferably 0.01 parts by weight or more, more preferably 0.02 parts by weight or more, particularly 100 parts by weight of the non-conductive particles described above.
- it is 0.03 mass part or more,
- it is 0.8 mass part or less, More preferably, it is 0.5 weight part or less, Most preferably, it is 0.2 weight part or less.
- the method for producing the water-soluble polymer there is no limitation on the method for producing the water-soluble polymer. Further, there is no limitation on the method for introducing a sulfonic acid group and, if necessary, a carboxylic acid group into the water-soluble polymer. For example, a monomer having a sulfonic acid group or a carboxylic acid group is used during the production of the water-soluble polymer. The polymerization may be performed using a polymerization initiator having a sulfonic acid group or a carboxylic acid group, or a combination thereof. Furthermore, there is no restriction
- the porous membrane of the present invention contains the above non-conductive particles, a binder and a water-soluble polymer, and further has an electrolyte solution additive having functions such as a surfactant, a viscosity modifier, an antifoaming agent, and an electrolyte decomposition inhibitor.
- an electrolyte solution additive having functions such as a surfactant, a viscosity modifier, an antifoaming agent, and an electrolyte decomposition inhibitor.
- Other components such as may be included. These are not particularly limited as long as they do not affect the battery reaction. These include components added to improve the stability of the slurry for porous membranes and components added to improve battery performance.
- the surfactant examples include an anionic surfactant, a nonionic surfactant, a cationic surfactant, and an amphoteric surfactant.
- anionic surface activity soap, alkylbenzene sulfonate, higher alcohol sulfate, polyoxyethylene alkyl ether sulfate, ⁇ -sulfo fatty acid ester, ⁇ -olefin sulfonate, monoalkyl phosphate ester, alkanesulfone Acid salts.
- Nonionic surfactants include polyoxyethylene alkyl ether, polyoxyethylene alkylphenol ether, alkylphenol (poly) ethoxylate, alkyl glucoside, polyoxyethylene fatty acid ester, sucrose fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid Examples include esters and fatty acid alkanolamides.
- Examples of the cationic surfactant include alkyl trimethyl ammonium salts, dialkyl dimethyl ammonium salts, alkyl dimethyl benzyl ammonium salts, and amine salt systems.
- Examples of amphoteric surfactants include alkylamino fatty acid salts, alkylbetaines, and alkylamine oxides.
- nonionic surfactants are preferable, and polyoxyalkylene alkyl ether is particularly preferable.
- the molecular weight of the ether part is preferably 220 to 11000, and the ether part is preferably a polyethylene glycol type.
- nonionic surfactants having a cloud point of 30 to 90 ° C., preferably 32 to 88 ° C., more preferably 35 to 85 ° C. are suitable.
- Cloud point means a physical property value that is a measure of hydrophilicity / hydrophobicity of a surfactant. The higher the cloud point, the higher the hydrophilicity.
- ISO 1065-1975 (E) “Ethylene oxide nonionic interface It is measured in accordance with “Measurement method B” in “Activator—Cloud point measurement method”.
- a sample is put into a 25% by weight aqueous solution of butyl diglycol (3,6-oxadecyl alcohol: butanol EO 2-mole adduct) so as to have a concentration of 10% by weight and dissolved uniformly (usually at 25 ° C. If it does not dissolve, cool it until it becomes a clear liquid).
- a test tube having an outer diameter of 18 mm, a total length of 165 mm, and a wall thickness of about 1 mm, and a thermometer with a diameter of about 6 mm, a length of about 250 mm, and a half degree scale is placed in the sample solution.
- the sample solution is made cloudy by raising the temperature at 1.5 ⁇ 0.5 ° C./min. Thereafter, while stirring, the sample solution is cooled at 1.0 ⁇ 0.2 ° C./min to read the temperature at which the sample solution becomes completely transparent, and this is taken as the cloud point.
- Nonionic surfactants with a cloud point in the above range improve the wettability with the base material (organic separator or electrode mixture layer) because the dynamic surface tension of the slurry at the time of coating is lowered, Uneven coating can be prevented.
- the content of the surfactant in the slurry for the porous membrane is preferably within a range that does not affect the battery characteristics. Specifically, the content is 0.01 to 3 with respect to 100 parts by mass of the nonconductive particles in the slurry for the porous membrane. Part by mass, preferably 0.03 to 1.5 parts by mass, more preferably 0.05 to 1 part by mass.
- the content of the surfactant in the slurry for the porous membrane is too large, especially when the slurry for the porous membrane is applied to the organic separator, the permeability of the slurry to the organic separator becomes too large, and the slurry reaches the back of the organic separator. May be transmitted.
- a slurry may be repelled by an organic separator.
- the viscosity modifier include cellulose derivatives such as carboxymethyl cellulose; poly (meth) acrylates such as sodium poly (meth) acrylate; polyvinyl alcohol, modified polyvinyl alcohol, polyethylene oxide; polyvinylpyrrolidone, polycarboxylic acid, Examples thereof include oxidized starch, phosphate starch, casein, various modified starches, chitin, and chitosan derivatives. Among these, cellulose derivatives are particularly preferable.
- the cellulose derivative is a compound obtained by etherifying or esterifying at least a part of the hydroxyl group of cellulose, and is preferably water-soluble.
- Cellulose derivatives usually do not have a glass transition point. Specific examples include carboxymethyl cellulose, carboxymethyl ethyl cellulose, methyl cellulose, ethyl cellulose, ethyl hydroxyethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose.
- these ammonium salt and alkali metal salt are mentioned.
- a salt of carboxymethyl cellulose is preferable, and an ammonium salt of carboxymethyl cellulose is particularly preferable.
- the degree of etherification of the cellulose derivative is preferably 0.5 to 2, more preferably 0.5 to 1.5.
- the degree of etherification is a value representing how many hydroxyl groups contained per 3 glucose units of cellulose are etherified on average.
- the degree of etherification is within this range, the stability of the slurry for the porous membrane is high, and solid matter precipitation and aggregation are unlikely to occur.
- the coating property and fluidity liquidity of a coating material improve by using a cellulose derivative.
- the viscosity when the solid content concentration of the viscosity modifier is 1% is preferably 10 to 8000 mPa ⁇ s. By using a viscosity modifier having a viscosity in the range of this value, the uniform coating property of the porous membrane slurry is excellent, and the high-speed coating property and the temporal stability of the slurry are also excellent.
- the viscosity when the solid content concentration of the viscosity modifier is 1% is a value when measured after 60 seconds at 25 ° C. and a rotational speed of 60 rpm using a B-type viscometer.
- the content of the viscosity modifier in the slurry for the porous membrane is preferably 0.01 to 5 parts by mass, more preferably 0.05 to 4 parts by mass, particularly preferably 100 parts by mass of the nonconductive particles in the slurry. Is in the range of 0.05 to 3 parts by mass. If the blending amount of the viscosity modifier is excessive, the flexibility of the resulting porous membrane may be reduced. If the blending amount is too small, the strength of the porous membrane may be decreased.
- additives include nanoparticles such as fumed silica and fumed alumina. By mixing the nanoparticles, the thixotropy of the slurry for the porous film can be controlled, and the leveling property of the porous film obtained thereby can be improved.
- the solid content ratio of the non-conductive particles, the binder, the water-soluble polymer, and optional components used as necessary in the slurry for the porous membrane is the same as that of the porous membrane, and the slurry for the porous membrane of the present invention is These solid contents are dissolved or dispersed in water as a dispersion medium.
- the method for producing the slurry for the porous membrane is not particularly limited, and can be obtained by mixing non-conductive particles, a binder, a water-soluble polymer, and water and other components added as necessary.
- the mixing apparatus is not particularly limited as long as it can uniformly mix the above components, and a ball mill, a sand mill, a pigment disperser, a crusher, an ultrasonic disperser, a homogenizer, a planetary mixer, and the like can be used.
- a high dispersion apparatus such as a bead mill, a roll mill, or a fill mix that can add a high dispersion share.
- the solid content concentration of the slurry for the porous membrane is not particularly limited as long as it can be applied and immersed and has a fluid viscosity, but is generally about 20 to 50% by mass.
- the viscosity of the slurry for the porous membrane of the present invention is sufficient if it is suitable for coating, but is preferably 10 to 300 mPa ⁇ s.
- the viscosity of the slurry for the porous film is more preferably 10 to 200 mPa ⁇ s, particularly preferably 20 to 100 mPa ⁇ s.
- the viscosity of the slurry for a porous membrane is a value ( ⁇ 60 ) when measured after 60 seconds at 25 ° C. and a rotational speed of 60 rpm using an E-type viscometer.
- the TI value calculated from the following formula (1) is preferably 1.1 to 3.0, more preferably 1.2 to 2.0. It is particularly preferably 2 to 1.5.
- the TI value is an index that indicates the structural viscosity of the slurry.
- ⁇ 6 is the viscosity after 60 seconds measured at 25 ° C. and 6 rpm with an E-type viscometer
- ⁇ 60 is 25 ° C. and 60 rpm with an E-type viscometer. The measured viscosity after 60 seconds.
- the viscosity modifier used has a viscosity of 10 to 8000 mPa ⁇ s, preferably 20 to 5000 mPa ⁇ s, more preferably 50 to 1000 mPa ⁇ s when the solid content of the viscosity modifier is 1%.
- Use a viscosity modifier Use a viscosity modifier.
- the solid content concentration of the slurry is adjusted. And the like.
- the electrode for a secondary battery of the present invention comprises an electrode mixture layer comprising an electrode mixture layer binder and an electrode active material attached to a current collector, and the porous membrane on the electrode mixture layer.
- the electrode for a secondary battery of the present invention has a porous film formed on the electrode mixture layer by applying and drying the slurry for porous film.
- the electrode mixture layer used in the present invention comprises an electrode mixture layer binder and an electrode active material.
- Binder for electrode mixture layer Various resin components can be used as the binder for the electrode mixture layer.
- Various resin components can be used as the binder for the electrode mixture layer.
- polyethylene polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polyacrylic acid derivatives, polyacrylonitrile derivatives, and the like can be used. These may be used alone or in combination of two or more.
- the soft polymer illustrated below can also be used as a binder for electrode mixture layers.
- Acrylic acid such as polybutyl acrylate, polybutyl methacrylate, polyhydroxyethyl methacrylate, polyacrylamide, polyacrylonitrile, butyl acrylate / styrene copolymer, butyl acrylate / acrylonitrile copolymer, butyl acrylate / acrylonitrile / glycidyl methacrylate copolymer
- Isobutylene-based soft polymers such as polyisobutylene, isobutylene-isoprene rubber, isobutylene-styrene copolymer;
- Olefinic soft polymers of Vinyl-based soft polymers such as polyvinyl alcohol, polyvinyl acetate, polyvinyl stearate, vinyl acetate / styrene copolymer; Epoxy-based soft polymers such as polyethylene oxide, polypropylene oxide, epichlorohydrin rubber; Fluorine-containing soft polymers such as vinylidene fluoride rubber and tetrafluoroethylene-propylene rubber; Examples thereof include other soft polymers such as natural rubber, polypeptide, protein, polyester-based thermoplastic elastomer, vinyl chloride-based thermoplastic elastomer, and polyamide-based thermoplastic elastomer. These soft polymers may have a cross-linked structure or may have a functional group introduced by modification.
- the amount of the binder for the electrode mixture layer in the electrode mixture layer is preferably 0.1 to 5 parts by mass, more preferably 0.2 to 4 parts by mass, particularly preferably 100 parts by mass of the electrode active material. Is 0.5 to 3 parts by mass. When the amount of the binder for the electrode mixture layer in the electrode mixture layer is within the above range, it is possible to prevent the active material from dropping from the electrode without inhibiting the battery reaction.
- the binder for the electrode mixture layer is prepared as a solution or a dispersion for producing an electrode.
- the viscosity at that time is usually in the range of 1 mPa ⁇ s to 300,000 mPa ⁇ s, preferably 50 mPa ⁇ s to 10,000 mPa ⁇ s.
- the viscosity is 25 ° C. using a B-type viscometer, It is a value when measured at a rotational speed of 60 rpm.
- the electrode active material used for the electrode for the lithium ion secondary battery is not particularly limited as long as it can reversibly insert and release lithium ions by applying a potential in the electrolyte, and can be an inorganic compound or an organic compound.
- Electrode active materials (positive electrode active materials) for lithium ion secondary battery positive electrodes are broadly classified into those made of inorganic compounds and those made of organic compounds.
- Examples of the positive electrode active material made of an inorganic compound include transition metal oxides, composite oxides of lithium and transition metals, and transition metal sulfides.
- As the transition metal Fe, Co, Ni, Mn and the like are used.
- the inorganic compound used for the positive electrode active material include LiCoO 2 , LiNiO 2 , LiMnO 2 , LiMn 2 O 4 , LiFePO 4 , LiFeVO 4 and other lithium-containing composite metal oxides; TIS 2 , TIS 3 , non- Transition metal sulfides such as crystalline MoS 2 ; transition metal oxides such as Cu 2 V 2 O 3 , amorphous V 2 O—P 2 O 5 , MoO 3 , V 2 O 5 , V 6 O 13 It is done. These compounds may be partially element-substituted.
- the positive electrode active material made of an organic compound for example, a conductive polymer such as polyacetylene or poly-p-phenylene can be used.
- An iron-based oxide having poor electrical conductivity may be used as an electrode active material covered with a carbon material by allowing a carbon source material to be present during reduction firing. These compounds may be partially element-substituted.
- the positive electrode active material for a lithium ion secondary battery may be a mixture of the above inorganic compound and organic compound.
- the particle diameter of the positive electrode active material is appropriately selected in consideration of other constituent elements of the battery. From the viewpoint of improving battery characteristics such as load characteristics and cycle characteristics, the 50% volume cumulative diameter is usually 0.1. It is ⁇ 50 ⁇ m, preferably 1 to 20 ⁇ m. When the 50% volume cumulative diameter is within this range, a secondary battery having a large charge / discharge capacity can be obtained, and handling of the slurry for electrodes and the electrodes is easy.
- the 50% volume cumulative diameter can be determined by measuring the particle size distribution by laser diffraction.
- Examples of electrode active materials (negative electrode active materials) for negative electrodes of lithium ion secondary batteries include carbonaceous materials such as amorphous carbon, graphite, natural graphite, mesocarbon microbeads, pitch-based carbon fibers, and high conductivity such as polyacene. Examples include molecules.
- the negative electrode active material metals such as silicon, tin, zinc, manganese, iron, nickel, alloys thereof, oxides or sulfates of the metals or alloys are used.
- lithium alloys such as lithium metal, Li—Al, Li—Bi—Cd, and Li—Sn—Cd, lithium transition metal nitride, silicon, and the like can be used.
- the electrode active material a material obtained by attaching a conductivity imparting material to the surface by a mechanical modification method can be used.
- the particle diameter of the negative electrode active material is appropriately selected in consideration of other constituent elements of the battery. From the viewpoint of improving battery characteristics such as initial efficiency, load characteristics, and cycle characteristics, a 50% volume cumulative diameter is usually The thickness is 1 to 50 ⁇ m, preferably 15 to 30 ⁇ m.
- the electrode mixture layer may contain a conductivity imparting material or a reinforcing material.
- a conductivity imparting material conductive carbon such as acetylene black, ketjen black, carbon black, graphite, vapor-grown carbon fiber, and carbon nanotube can be used. Examples thereof include carbon powders such as graphite, and fibers and foils of various metals.
- the reinforcing material various inorganic and organic spherical, plate-like, rod-like or fibrous fillers can be used.
- the amount of the conductivity-imparting material used is usually 0 to 20 parts by mass, preferably 1 to 10 parts by mass with respect to 100 parts by mass of the electrode active material.
- the electrode mixture layer is formed by attaching a slurry containing a binder for an electrode mixture layer, an electrode active material, and a solvent (hereinafter sometimes referred to as “mixture slurry”) to a current collector. Can do.
- the solvent is not particularly limited as long as it dissolves or disperses the binder for the electrode mixture layer in the form of particles, but preferably dissolves.
- the electrode active layer binder is adsorbed on the surface, thereby stabilizing the dispersion of the electrode active material and the like.
- the mixture slurry contains a solvent, and can be obtained by dispersing optional components such as an electrode active material, an essential component of the binder for the electrode mixture layer, and a conductivity-imparting material.
- a solvent it is preferable to use a solvent capable of dissolving the binder because the dispersibility of the electrode active material and the conductivity-imparting material is excellent.
- organic solvents include cycloaliphatic hydrocarbons such as cyclopentane and cyclohexane; aromatic hydrocarbons such as toluene and xylene; ketones such as ethyl methyl ketone and cyclohexanone; ethyl acetate, butyl acetate, ⁇ -butyrolactone, ⁇ -Esters such as caprolactone; Acylonitriles such as acetonitrile and propionitrile; Ethers such as tetrahydrofuran and ethylene glycol diethyl ether; Alcohols such as methanol, ethanol, isopropanol, ethylene glycol and ethylene glycol monomethyl ether; N-methyl Amides such as pyrrolidone and N, N-dimethylformamide are exemplified. These solvents may be used alone or in admixture of two or more
- the mixture slurry may further contain additives that exhibit various functions such as a thickener.
- a thickener a polymer soluble in the organic solvent used for the mixture slurry is used. Specifically, acrylonitrile-butadiene copolymer hydride or the like is used.
- the mixture slurry contains trifluoropropylene carbonate, vinylene carbonate, catechol carbonate, 1,6-dioxaspiro [4,4] nonane-2,7 in order to increase the stability and life of the battery.
- -Dione, 12-crown-4-ether and the like can be used. These may be used by being contained in an electrolyte solution described later.
- the amount of the solvent in the mixture slurry is adjusted so as to have a viscosity suitable for coating according to the type of the electrode active material, the binder for the electrode mixture layer, and the like.
- the concentration of the solid content of the electrode active material, the binder for the electrode mixture layer and other additives is preferably 30 to 90% by mass, more preferably 40 to 40%.
- the amount used is adjusted to 80% by mass.
- the mixture slurry is obtained by mixing an electrode active material, a binder for the electrode mixture layer, a conductivity-imparting material added as necessary, other additives, and a solvent using a mixer. Mixing may be performed by supplying the above components all at once to a mixer.
- the conductivity-imparting material and the thickener are mixed in a solvent. It is preferable that the conductive material is dispersed in the form of fine particles, and then the binder for the electrode mixture layer and the electrode active material are added and further mixed to improve the dispersibility of the slurry.
- a mixer As a mixer, a ball mill, a sand mill, a pigment disperser, a pulverizer, an ultrasonic disperser, a homogenizer, a planetary mixer, a Hobart mixer, and the like can be used. It is preferable because aggregation of the resin can be suppressed.
- the particle size of the mixture slurry is preferably 35 ⁇ m or less, and more preferably 25 ⁇ m or less.
- the conductive material is highly dispersible and a homogeneous electrode can be obtained.
- the current collector is not particularly limited as long as it is an electrically conductive and electrochemically durable material. From the viewpoint of having heat resistance, for example, iron, copper, aluminum, nickel, stainless steel, etc. Metal materials such as titanium, tantalum, gold, and platinum are preferable. Among these, aluminum is particularly preferable for the positive electrode of the nonaqueous electrolyte lithium ion secondary battery, and copper is particularly preferable for the negative electrode.
- the shape of the current collector is not particularly limited, but a sheet shape having a thickness of about 0.001 to 0.5 mm is preferable. In order to increase the adhesive strength of the mixture, the current collector is preferably used after roughening in advance.
- Examples of the roughening method include a mechanical polishing method, an electrolytic polishing method, and a chemical polishing method.
- a mechanical polishing method an abrasive cloth paper with a fixed abrasive particle, a grindstone, an emery buff, a wire brush provided with a steel wire or the like is used.
- an intermediate layer may be formed on the current collector surface in order to increase the adhesive strength and conductivity of the electrode mixture layer.
- the method for producing the electrode mixture layer may be any method in which the electrode mixture layer is bound in layers on at least one side, preferably both sides of the current collector.
- the mixture slurry is applied to a current collector and dried, and then heated at 120 ° C. or higher for 1 hour or longer to form an electrode mixture layer.
- the method for applying the mixture slurry to the current collector is not particularly limited. Examples thereof include a doctor blade method, a dip method, a reverse roll method, a direct roll method, a gravure method, an extrusion method, and a brush coating method.
- Examples of the drying method include drying by warm air, hot air, low-humidity air, vacuum drying, and drying by irradiation with (far) infrared rays or electron beams.
- the porosity of the electrode mixture is preferably cured.
- the thickness of the electrode mixture layer is usually 5 to 300 ⁇ m, preferably 10 to 250 ⁇ m, for both the positive electrode and the negative electrode.
- the method for applying the slurry for the porous membrane of the present invention onto the electrode mixture layer is not particularly limited. Examples thereof include a doctor blade method, a dip method, a reverse roll method, a direct roll method, a gravure method, an extrusion method, and a brush coating method. Among them, the dip method and the gravure method are preferable in that a uniform porous film can be obtained.
- drying method examples include drying with warm air, hot air, low-humidity air, vacuum drying, and drying by irradiation with (far) infrared rays or electron beams.
- the drying temperature can be changed depending on the type of solvent used. In order to completely remove the solvent, for example, when a low-volatility solvent such as N-methylpyrrolidone is used as the solvent, it is preferably dried at a high temperature of 120 ° C. or more with a blower-type dryer. Conversely, when a highly volatile solvent is used, it can be dried at a low temperature of 100 ° C. or lower.
- a low-volatility solvent such as N-methylpyrrolidone
- the adhesion between the electrode mixture layer and the porous film can be improved by a press treatment using a mold press or a roll press.
- the pressure treatment is excessively performed, the porosity of the porous film may be impaired, so the pressure and the pressure time are controlled appropriately.
- the separator for a secondary battery of the present invention has the porous film on an organic separator.
- the separator for secondary batteries of the present invention has a porous film formed by applying and drying the slurry for porous film on an organic separator.
- Organic separator As the organic separator used in the present invention, a porous membrane having a fine pore size, having no electron conductivity and ionic conductivity, high resistance to organic solvents, is used. Vinyl), and a microporous film made of a resin such as a mixture or a copolymer thereof, polyethylene terephthalate, polycycloolefin, polyether sulfone, polyamide, polyimide, polyimide amide, polyaramid, polycycloolefin, nylon, polytetrafluoroethylene Examples thereof include a microporous membrane made of a resin such as the above, or a woven fabric of polyolefin fibers, a nonwoven fabric thereof, an aggregate of insulating substance particles, or the like.
- a resin such as a mixture or a copolymer thereof, polyethylene terephthalate, polycycloolefin, polyether sulfone, polyamide, polyimide, polyimide amide, polyaramid, polycycl
- a microporous membrane made of a polyolefin-based resin can be used because the coating property of the slurry for the porous membrane is excellent, the separator film thickness can be reduced and the active material ratio in the battery can be increased to increase the capacity per volume. Is preferred.
- the thickness of the organic separator is usually 0.5 to 40 ⁇ m, preferably 1 to 30 ⁇ m, more preferably 1 to 10 ⁇ m. Within this range, the resistance due to the organic separator in the battery is reduced, and the workability during application to the organic separator is good.
- examples of the polyolefin resin used as the material for the organic separator include homopolymers such as polyethylene and polypropylene, copolymers, and mixtures thereof.
- examples of the polyethylene include low density, medium density, and high density polyethylene, and high density polyethylene is preferable from the viewpoint of piercing strength and mechanical strength. These polyethylenes may be mixed in two or more types for the purpose of imparting flexibility.
- the polymerization catalyst used for these polyethylenes is not particularly limited, and examples thereof include Ziegler-Natta catalysts, Phillips catalysts, and metallocene catalysts.
- the viscosity average molecular weight of polyethylene is preferably 100,000 or more and 12 million or less, more preferably 200,000 or more and 3 million or less.
- polypropylene include homopolymers, random copolymers, and block copolymers, and one kind or a mixture of two or more kinds can be used.
- the polymerization catalyst is not particularly limited, and examples thereof include Ziegler-Natta catalysts and metallocene catalysts.
- the stereoregularity is not particularly limited, and isotactic, syndiotactic or atactic can be used. However, it is desirable to use isotactic polypropylene because it is inexpensive.
- an appropriate amount of a polyolefin other than polyethylene or polypropylene, and an additive such as an antioxidant or a nucleating agent may be added to the polyolefin as long as the effects of the present invention are not impaired.
- a method for producing a polyolefin-based organic separator known and publicly used methods are used.For example, after forming a film of polypropylene and polyethylene by melt extrusion, annealing is performed at a low temperature to grow a crystal domain, and stretching is performed in this state.
- a wet method in which a microporous film is formed by removing a film that has started to form a gathered island phase by using this solvent or other low-molecular solvent with another volatile solvent is selected.
- a dry method is preferable in that a large void can be easily obtained for the purpose of reducing the resistance.
- the organic separator used in the present invention may contain other fillers and fiber compounds other than non-conductive particles for the purpose of controlling strength, hardness, and heat shrinkage rate.
- other fillers and fiber compounds other than non-conductive particles for the purpose of controlling strength, hardness, and heat shrinkage rate.
- laminating a layer of a porous film containing non-conductive particles and a binder in order to improve the adhesion, or to reduce the surface tension with the electrolytic solution to improve the liquid impregnation property, it is reduced in advance.
- the surface of the organic separator may be coated with a molecular compound or a polymer compound, or may be subjected to electromagnetic radiation treatment such as ultraviolet rays or plasma treatment such as corona discharge / plasma gas.
- it contains polar groups such as a carboxylic acid group, a hydroxyl group, and a sulfonic acid group from the viewpoint that the impregnation property of the electrolytic solution is high and the adhesion to the porous membrane layer containing the non-conductive particles and the binder is easily obtained. It is preferable to coat with a polymer compound.
- the organic separator used in the present invention may have a multilayer structure between the organic separators for the purpose of increasing the tear strength and the piercing strength. Specifically, a laminate of a polyethylene microporous membrane and a polypropylene microporous membrane, a laminate of a nonwoven fabric and a polyolefin separator, and the like can be given.
- the method for applying the slurry for the porous membrane of the present invention onto the organic separator is not particularly limited. Examples thereof include a doctor blade method, a dip method, a reverse roll method, a direct roll method, a gravure method, an extrusion method, and a brush coating method. Among them, the dip method and the gravure method are preferable in that a uniform porous film can be obtained.
- Examples of the method for drying the slurry for the porous film applied on the organic separator include hot air, Drying by hot air, low-humidity air, vacuum drying, (far) infrared or electron beam irradiation can be used.
- the drying temperature can be changed depending on the type of solvent used for the slurry for the porous membrane.
- a low-volatility solvent such as N-methylpyrrolidone
- it is preferably dried at a high temperature of 120 ° C. or more with a blower type dryer.
- a highly volatile solvent when used, it can be dried at a low temperature of 100 ° C. or lower.
- the Gurley value after the formation of the porous film generally increases.
- the rate of increase of the Gurley value can be kept low. The lower the increase rate of the Gurley value, the better the ion permeability and the better the rate characteristics of the battery.
- the thermal shrinkage rate of the separator with the porous film can be lowered. For this reason, even when the battery temperature rises, a short circuit due to thermal contraction of the organic separator is prevented, which can contribute to improvement of battery safety.
- the temperature is preferably as high as possible as long as the organic separator as the base material does not shrink, but a temperature range of 50 to 90 ° C. is preferable.
- the film thickness of the porous film formed on the electrode mixture layer or the organic separator is not particularly limited, and is appropriately set according to the use or application field of the porous film. Since the capacity per volume (mass) decreases, 0.5 to 50 ⁇ m is preferable, and 0.5 to 10 ⁇ m is more preferable.
- the porous film formed on the electrode mixture layer or the organic separator has a structure in which non-conductive particles are bound via a binder, and voids between the non-conductive particles are formed. Since the electrolytic solution can penetrate into the voids, the battery reaction is not hindered.
- the secondary battery of the present invention includes a positive electrode, a negative electrode, a separator, and an electrolyte solution, and at least one of the positive electrode and the negative electrode is the electrode for the secondary battery (hereinafter referred to as “first secondary battery”). May be described.)
- Examples of the secondary battery include lithium ion secondary batteries and nickel metal hydride secondary batteries.
- lithium ion secondary batteries are the most demanded for improving safety and having the highest effect of introducing a porous film. preferable.
- the case where it uses for a lithium ion secondary battery is demonstrated.
- Electrode As the electrolytic solution for the lithium ion secondary battery, an organic electrolytic solution in which a supporting electrolyte is dissolved in an organic solvent is used. A lithium salt is used as the supporting electrolyte.
- the lithium salt is not particularly limited, LiPF 6, LiAsF 6, LiBF 4, LiSbF 6, LiAlCl 4, LiClO 4, CF 3 SO 3 Li, C 4 F 9 SO 3 Li, CF 3 COOLi, (CF 3 CO) 2 NLi, (CF 3 SO 2 ) 2 NLi, (C 2 F 5 SO 2 ) NLi, and the like.
- LiPF 6 , LiClO 4 , and CF 3 SO 3 Li that are easily soluble in a solvent and exhibit a high degree of dissociation are preferable. Two or more of these may be used in combination. Since the lithium ion conductivity increases as the supporting electrolyte having a higher degree of dissociation is used, the lithium ion conductivity can be adjusted depending on the type of the supporting electrolyte.
- the organic solvent used in the electrolyte for the lithium ion secondary battery is not particularly limited as long as it can dissolve the supporting electrolyte, but dimethyl carbonate (DMC), ethylene carbonate (EC), diethyl carbonate (DEC), propylene Carbonates such as carbonate (PC), butylene carbonate (BC) and methyl ethyl carbonate (MEC); esters such as ⁇ -butyrolactone and methyl formate; ethers such as 1,2-dimethoxyethane and tetrahydrofuran; sulfolane and dimethyl sulfoxide Sulfur-containing compounds such as are preferably used. Moreover, you may use the liquid mixture of these solvents.
- DMC dimethyl carbonate
- EC ethylene carbonate
- DEC diethyl carbonate
- PC butylene carbonate
- MEC methyl ethyl carbonate
- esters such as ⁇ -butyrolactone and methyl formate
- ethers such as 1,2-d
- carbonates are preferable because they have a high dielectric constant and a wide stable potential region. Since the lithium ion conductivity increases as the viscosity of the solvent used decreases, the lithium ion conductivity can be adjusted depending on the type of the solvent.
- the concentration of the supporting electrolyte in the electrolyte for a lithium ion secondary battery is usually 1 to 30% by mass, preferably 5% to 20% by mass.
- the concentration is usually 0.5 to 2.5 mol / L depending on the type of the supporting electrolyte. If the concentration of the supporting electrolyte is too low or too high, the ionic conductivity tends to decrease. Since the degree of swelling of the polymer particles increases as the concentration of the electrolytic solution used decreases, the lithium ion conductivity can be adjusted by the concentration of the electrolytic solution.
- examples of the separator include organic separators exemplified by the above-described secondary battery separator.
- the positive electrode and the negative electrode the secondary battery electrode may be used.
- an electrode comprising the electrode mixture layer binder exemplified in the secondary battery electrode and an electrode active material Examples thereof include those in which the mixture layer is attached to the current collector. What is necessary is just to use the said separator for secondary batteries as a separator as a separator.
- the secondary battery electrode may be used as a positive electrode or a negative electrode
- the secondary battery separator may be used as a separator
- a positive electrode and a negative electrode are overlapped via a separator, and this is wound into a battery container according to the shape of the battery.
- the method of injecting and sealing is mentioned.
- the porous film of the present invention is formed on either the positive electrode, the negative electrode, or the separator. In addition, lamination with only a porous film is possible. If necessary, an expanded metal, an overcurrent prevention element such as a fuse or a PTC element, a lead plate, or the like can be inserted to prevent an increase in pressure inside the battery and overcharge / discharge.
- the shape of the battery may be any of a coin shape, a button shape, a sheet shape, a cylindrical shape, a square shape, a flat shape, and the like.
- Example Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited thereto.
- the part and% in a present Example are a mass reference
- various physical properties are evaluated as follows.
- volume average particle size of the non-conductive particles is measured with a laser diffraction particle size distribution analyzer (SALD-2000: manufactured by Shimadzu Corporation).
- D: The volume average particle diameter D50 of the nonconductive particles in the slurry is 1.8 times or more and less than 2.0 times the primary particle diameter of the nonconductive particles.
- SA Change rate of volume average particle diameter D50 is less than 1.2 times
- A Change rate of volume average particle diameter D50 is 1.2 times or more and less than 1.4 times.
- B The rate of change of the volume average particle diameter D50 is 1.4 times or more and less than 1.6 times.
- C Change rate of volume average particle diameter D50 is 1.6 times or more and less than 1.8 times.
- D The change rate of the volume average particle diameter D50 is 1.8 times or more and less than 2.0 times.
- E Change rate of volume average particle diameter D50 is 2.0 times or more.
- Viscosity of slurry for porous film The viscosity of the slurry for the porous membrane is measured with a cone-plate rotary viscometer (25 ° C., rotation speed: 6 rpm, 60 rpm, plate No: 42) according to JIS Z8803: 1991, and is a value 60 seconds after the start of measurement. Ask for.
- the TI value (thixotropic index value) is calculated from the viscosity ⁇ 6 after 60 seconds and the viscosity ⁇ 60 after 60 seconds and the viscosity ⁇ 60 after 60 seconds using the following formula (1).
- TI value ⁇ 6 / ⁇ 60 (1)
- An electrode with a porous film or a separator with a porous film is cut into a rectangle having a width of 1 cm and a length of 5 cm to obtain a test piece. Place the test piece on the desk with the porous membrane side facing up, and place a stainless steel rod with a diameter of 1 mm on the collector in the center of the length direction (position 2.5 cm from the end), or on the organic separator side. Lay in the short direction. The test piece is bent 180 ° around the stainless steel bar so that the porous film faces the outside. The above test is performed on ten test pieces, and the presence or absence of cracks or powder falling is observed in the bent portion of the porous film of each test piece, and the determination is made according to the following criteria.
- the porous film formed on the electrode mixture layer or the organic separator is more excellent in the powder-off property as the number of cracks and peeling powder-off is smaller.
- the powder falling property is evaluated for the porous film formed first.
- SA Cracks and powder fall are not observed in all 10 sheets.
- A Cracking or powder falling is observed in 1 out of 10 sheets.
- B Cracking or powder falling is observed on 3 or 4 out of 10 sheets.
- C Cracking or powder falling is observed on 5 or 6 of 10 sheets.
- D Cracking or powder falling is observed on 7 or 8 sheets out of 10 sheets.
- E Cracking or powder falling is observed on 9 or more of 10 sheets.
- Gurley value increase rate is less than 4%.
- Gurley value increase rate is 4% or more and less than 8%.
- B: Gurley value increase rate is 8% or more and less than 12%
- C: Gurley value increase rate is 12% or more and less than 16%
- D: Gurley value increase rate is 16% or more and less than 20%.
- Heat shrinkage of separator A separator with a porous membrane is cut into a square having a width of 5 cm and a length of 5 cm to form a test piece. The test piece was placed in a thermostatic bath at 150 ° C. and allowed to stand for 1 hour, and then the square area change was determined as the heat shrinkage rate. The above test is performed on five test pieces, and the thermal contraction rate of each test piece is obtained and determined according to the following criteria. The smaller the heat shrinkage rate, the better the heat shrinkability of the separator. SA: The thermal shrinkage rate of all 5 sheets is less than 1%. A: The thermal shrinkage rate of 1 sheet out of 5 sheets is 1% or more. B: The thermal shrinkage rate of 2 sheets out of 5 sheets is 1% or more. C: The thermal contraction rate of 3 sheets out of 5 sheets is 1% or more. D: The heat shrinkage rate of 4 sheets out of 5 sheets is 1% or more. E: The thermal shrinkage rate of all five sheets is 1% or more.
- B The charge / discharge capacity retention is 60% or more and less than 70%.
- C The charge / discharge capacity retention is 50% or more and less than 60%.
- D The charge / discharge capacity retention is 40% or more and less than 50%.
- E The charge / discharge capacity retention is 30% or more and less than 40%.
- F Charge / discharge capacity retention is less than 30%.
- B The charge / discharge rate characteristic is 70% or more and less than 75%.
- C The charge / discharge rate characteristic is 65% or more and less than 70%.
- D The charge / discharge rate characteristic is 60% or more and less than 65%.
- E The charge / discharge rate characteristics are 55% or more and less than 60%.
- F The charge / discharge rate characteristic is less than 55%.
- the nonelectroconductive particle, binder, and water-soluble polymer which were used are as follows.
- [Non-conductive particles] (Plate Alumina A) Alumina particles having L / b of 1.5, b / t of 50, L of 5 ⁇ m, and volume average particle size of 0.6 ⁇ m
- Platinum Alumina C Alumina particles (granular alumina) having L / b of 1.4, b / t of 100, L of 10 ⁇ m, and volume average particle size of 5 ⁇ m
- ion exchange water 50 parts of ion exchange water, 0.5 part of sodium dodecylbenzenesulfonate, 94.8 parts of butyl acrylate as a polymerizable monomer, 2 parts of acrylonitrile, 2 parts of methacrylic acid, N-methylolacrylamide 1.2 parts and 1 part of allyl glycidyl ether (AGE) were mixed to obtain a monomer mixture.
- This monomer mixture was continuously added to the reactor over 4 hours for polymerization. During the addition, the reaction was carried out at 60 ° C. After completion of the addition, the reaction was further terminated by stirring at 70 ° C. for 3 hours to obtain an aqueous dispersion (binder dispersion) containing a binder.
- the polymerization conversion rate was 99% or more.
- the mass ratio represented by “(meth) acrylonitrile monomer unit / (meth) acrylic acid ester monomer unit” was 2 / 94.8, and (meth) acrylonitrile monomer
- the abundance of the crosslinkable monomer unit with respect to 100 parts by weight of the total amount of the body unit and the (meth) acrylate monomer unit is 2.2 parts by weight.
- the volume average particle diameter was 370 nm.
- aqueous dispersion binder dispersion
- the polymerization conversion rate was 99% or more.
- 320 parts of NMP was added to 100 parts of this aqueous dispersion, and water was evaporated under reduced pressure to obtain an NMP solution of a binder.
- the solid content concentration of the NMP solution of the binder was 10%, and the viscosity was 75 mPa ⁇ s.
- the mass ratio represented by “(meth) acrylonitrile monomer unit / (meth) acrylic acid ester monomer unit” was 2 / 94.8, and (meth) acrylonitrile monomer
- the abundance of the crosslinkable monomer unit with respect to 100 parts by weight of the total amount of the body unit and the (meth) acrylate monomer unit is 2.2 parts by weight.
- the boiling point reflux state was maintained for 30 minutes to complete the polymerization to obtain an aqueous solution of water-soluble polymer A as a copolymer.
- the weight average molecular weight of the water-soluble polymer A was 6,000.
- the amount of the sulfonic acid unit contained in the water-soluble polymer A was 50% by weight, and the weight ratio of the sulfonic acid group in the water-soluble polymer A was 15% by weight.
- Water-soluble polymer B The amount of sodium acrylate aqueous solution was 429 g (solid content 150 g), the amount of sodium 3-allyloxy-2-hydroxy-1-propanesulfonate was 150 g (solid content 60 g), and the amount of ammonium persulfate aqueous solution was 100 g. Except for this, an aqueous solution of water-soluble polymer B as a copolymer was obtained in the same manner as in the production example of water-soluble polymer A. When the aqueous solution of the obtained water-soluble polymer B was analyzed, the weight average molecular weight of the water-soluble polymer B was 11,500. The amount of the sulfonic acid unit contained in the water-soluble polymer B was 29% by weight, and the weight ratio of the sulfonic acid group in the water-soluble polymer B was 5% by weight.
- Example 1 (Preparation of sample) As the non-conductive particles, plate-like alumina particles A having L / b of 1.5, b / t of 50, L of 5 ⁇ m, and volume average particle size of 0.6 ⁇ m were prepared.
- As the viscosity modifier an average polymerization degree of 1600 to 1800 and an etherification degree of 0.65 to 0.75 carboxymethylcellulose (product name BSH-12, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) were used.
- the viscosity of a 1% aqueous solution of a viscosity modifier was 6000 to 8000 mPa ⁇ s.
- the porous slurry 1 is dried on a single-layer polyethylene separator manufactured by a wet process having a width of 300 mm, a length of 1000 m, and a thickness of 15 ⁇ m so that the thickness after drying is 5 ⁇ m. Coating was carried out at a speed of 20 m / min, followed by drying in a drying furnace at 50 ° C. and winding to form a porous film on the polyethylene separator.
- the porous membrane slurry 1 was applied to the other surface and dried to obtain a separator (a separator with a porous membrane) 1 having a porous membrane with a thickness of 25 ⁇ m.
- a separator a separator with a porous membrane
- powder fall-off property, the increase rate of the Gurley value, and heat shrinkability were evaluated.
- ⁇ Manufacture of negative electrode> 98 parts of graphite having a particle size of 20 ⁇ m and a specific surface area of 4.2 m 2 / g as a negative electrode active material, and 1 part in terms of solid content of SBR (styrene-butadiene rubber, glass transition temperature: ⁇ 10 ° C.) as a binder
- SBR styrene-butadiene rubber, glass transition temperature: ⁇ 10 ° C.
- This negative electrode mixture layer slurry was applied to one side of a 18 ⁇ m thick copper foil, dried at 120 ° C. for 3 hours, and then roll pressed to obtain a negative electrode having a negative electrode mixture layer with a total thickness of 60 ⁇ m. .
- the positive electrode obtained above was cut into a circle having a diameter of 13 mm to obtain a circular positive electrode.
- the negative electrode obtained above was cut out into a circle having a diameter of 14 mm to obtain a circular negative electrode.
- the organic separator with a porous film obtained above was cut out into a circle having a diameter of 18 mm to obtain a circular organic separator with a porous film.
- a circular positive electrode is placed on the inner bottom surface of a stainless steel coin-type outer container provided with a polypropylene packing, a circular porous membrane separator is placed thereon, and a circular negative electrode is placed thereon. They were placed and stored in a container.
- the circular positive electrode was placed such that the surface on the aluminum foil side was directed to the bottom surface side of the outer container, and the surface on the positive electrode mixture layer side was directed upward.
- the circular negative electrode was placed so that the surface on the negative electrode mixture layer side faces the separator with a circular porous film and the surface on the copper foil side faces the upper side.
- a lithium ion secondary battery (coin cell CR2032) having a thickness of about 3.2 mm was manufactured.
- Example 2 Preparation of electrode with porous film
- Example 2 Preparation of electrode with porous film
- Coating was performed at a speed of 10 m / min, then drying at 90 ° C. and winding were performed to obtain an electrode 1 with a porous film.
- the obtained electrode 1 with a porous film was evaluated for flexibility and powder-off property. The results are shown in Table 2 .
- Example 1 The positive electrode obtained in Example 1 was cut out into a circle having a diameter of 13 mm to obtain a circular positive electrode.
- the negative electrode with a porous film obtained above was cut into a circle having a diameter of 14 mm to obtain a circular negative electrode.
- the single-layer polyethylene separator used in Example 1 was cut into a circle having a diameter of 18 mm to obtain a circular organic separator.
- a circular positive electrode is placed on the inner bottom surface of a stainless steel coin-type outer container provided with polypropylene packing, a circular organic separator is placed thereon, and a circular negative electrode with a porous film is further placed thereon.
- the circular positive electrode was placed such that the surface on the aluminum foil side was directed to the bottom surface side of the outer container, and the surface on the positive electrode mixture layer side was directed upward.
- the circular negative electrode with a porous film was placed so that the surface on the porous film layer side faced the circular organic separator side and the surface on the copper foil side faced upward.
- a lithium ion secondary battery (coin cell CR2032) having a thickness of about 3.2 mm was manufactured.
- Example 3 The same procedure as in Example 1 was conducted except that the blending amount of the viscosity modifier was changed as shown in Table 1 . The results are shown in Table 2 . In Example 4, the coating speed was 15 m / min.
- Example 5 The same procedure as in Example 1 was conducted except that the surfactant type and blending amount were changed as shown in Table 1 . The results are shown in Table 2 .
- Example 9 The same procedure as in Example 1 was conducted except that the surfactant B was used in place of the surfactant A, and the blending amount of the water-soluble polymer was changed as shown in Table 1 . The results are shown in Table 2 .
- Example 12 The procedure was the same as Example 1 except that the surfactant was not used. The results are shown in Table 2 .
- Example 13 The same procedure as in Example 1 was conducted except that the surfactant B was used in place of the surfactant A, and the type of the water-soluble polymer was changed as shown in Table 1 . The results are shown in Table 2 .
- Example 14 The procedure was the same as Example 1 except that the type of the water-soluble polymer was changed as shown in Table 1 . The results are shown in Table 2 .
- Example 15 The same procedure as in Example 1 was performed except that the plate-like alumina particles B were used in place of the plate-like alumina particles A. The results are shown in Table 2 .
- Example 16 The same procedure as in Example 1 was performed except that the plate-like alumina particles C were used instead of the plate-like alumina particles A. The results are shown in Table 2 .
- Example 1 The same procedure as in Example 1 was conducted except that the surfactant B was used in place of the surfactant A and the water-soluble polymer was not blended. The results are shown in Table 2 .
- Comparative Example 2 100 parts of plate-like alumina particles, 25 parts of an NMP solution of a binder, and N-methylpyrrolidone are mixed so that the solid content concentration is 40%, and dispersed using a bead mill to obtain slurry 2 for porous membrane. Manufactured. It replaced with the slurry 1 for porous films, and was the same as that of Example 1 except having used the said slurry 2 for porous films. The results are shown in Table 2 .
- Example 3 The procedure was the same as Example 2 except that the water-soluble polymer, surfactant, and viscosity modifier were not blended. The results are shown in Table 2 .
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Abstract
Description
例えば、特許文献1では、絶縁性微粒子として板状粒子と、破断伸びが300%以上の結着剤とを有する多孔質膜が開示されている。特許文献1によれば、この多孔質膜は板状粒子が配向するため、球状の粒子を使用するよりも安全性に優れ、さらに、破断伸びが300%以上の結着剤を使用しているため多孔膜の伸びにも優れることが記載されている。
さらに、非導電性粒子の配向性が高くなるため、薄膜化した際の安全性を高めることができることを見出し、本発明を完成するに至った。
(1)非導電性粒子、結着剤および水溶性重合体を含んでなり、
前記非導電性粒子の3軸径を、長径L、厚さt、幅bとしたとき、長径Lが0.1~20μm、幅bと厚さtとの比(b/t)が1.5~100であり、
前記結着剤が、(メタ)アクリロニトリル単量体単位及び(メタ)アクリル酸エステル単量体単位を含む共重合体であり、
前記水溶性重合体が、スルホン酸基を含み、重量平均分子量が1000~15000である二次電池用多孔膜。
前記水溶性重合体の含有量が、非導電性粒子100質量部に対し、0.01~0.8質量部である、(1)~(7)のいずれかに記載の二次電池用多孔膜。
前記非導電性粒子の3軸径を、長径L、厚さt、幅bとしたとき、長径Lが0.1~20μm、幅bと厚さtとの比(b/t)が1.5~100であり、
前記結着剤が、(メタ)アクリロニトリル単量体単位及び(メタ)アクリル酸エステル単量体単位を含む共重合体であり、
前記水溶性重合体が、スルホン酸基を含み、重量平均分子量が1000~15000である二次電池多孔膜用スラリー。
粉落ちが少ない多孔膜が提供される。さらに、本発明の多孔膜用スラリーによれば、非導電性粒子の分散性が高く、しかも増粘しにくく保存安定性に優れ、高速塗工が可能であり、さらに粉落ちが少ない上記多孔膜を簡便に形成することができる。
本発明の二次電池用多孔膜(以下、「多孔膜」と表すことがある。)は、二次電池の正極と負極との間に設置される多孔性の膜であり、非導電性粒子、結着剤および水溶性重合体を含有する。また多孔膜は、セパレータや電極に積層して用いたり、セパレータそのものとして用いることもできる。また、多孔膜用スラリーは、非導電性粒子、結着剤および水溶性重合体が水に分散されてなる。
非導電性粒子としては、その3軸径を、長径L、厚さt、幅bとしたとき、長径Lが0.1~20μmであり、幅bと厚さtとの比(b/t)が1.5~100である板状粒子が用いられる。
本発明では、(メタ)アクリロニトリル単量体単位及び(メタ)アクリル酸エステル単量体単位を含む共重合体を結着剤として用いる。結着剤が、前記共重合体であることにより、電解液への溶出を示さずに多孔膜の変形を生じにくくすることができる。さらに、高温においても電解液の膨潤性を保ちながら溶出しにくく、優れた高温特性を示す。これと前記の非導電性粒子とを組み合わせることで多孔膜の安全性をさらに向上することができる。この共重合体は、少なくとも、(メタ)アクリロニトリル単量体単位を与える単量体と、(メタ)アクリル酸エステル単量体単位を与える単量体とを共重合して得られる。
モノカルボン酸誘導体としては、2-エチルアクリル酸、2-エチルアクリル酸、イソクロトン酸、α―アセトキシアクリル酸、β-trans-アリールオキシアクリル酸、α-クロロ-β-E-メトキシアクリル酸、β-ジアミノアクリル酸などが挙げられる。
ジカルボン酸の酸無水物としては、無水マレイン酸、アクリル酸無水物、メチル無水マレイン酸、ジメチル無水マレイン酸などが挙げられる。
2-ヒドロキシエチル-2’-(メタ)アクリロイルオキシフタレート、2-ヒドロキシエチル-2’-(メタ)アクリロイルオキシサクシネートなどのジカルボン酸のジヒドロキシエステルのモノ(メタ)アクリル酸エステル類;2-ヒドロキシエチルビニルエーテル、2-ヒドロキシプロピルビニルエーテルなどのビニルエーテル類;(メタ)アリル-2-ヒドロキシエチルエーテル、(メタ)アリル-2-ヒドロキシプロピルエーテル、(メタ)アリル-3-ヒドロキシプロピルエーテル、(メタ)アリル-2-ヒドロキシブチルエーテル、(メタ)アリル-3-ヒドロキシブチルエーテル、(メタ)アリル-4-ヒドロキシブチルエーテル、(メタ)アリル-6-ヒドロキシヘキシルエーテルなどのアルキレングリコールのモノ(メタ)アリルエーテル類;ジエチレングリコールモノ(メタ)アリルエーテル、ジプロピレングリコールモノ(メタ)アリルエーテルなどのポリオキシアルキレングリコール(メタ)モノアリルエーテル類;グリセリンモノ(メタ)アリルエーテル、(メタ)アリル-2-クロロ-3-ヒドロキシプロピルエーテル、(メタ)アリル-2-ヒドロキシ-3-クロロプロピルエーテルなどの、(ポリ)アルキレングリコールのハロゲン及びヒドロキシ置換体のモノ(メタ)アリルエーテル;オイゲノール、イソオイゲノールなどの多価フェノールのモノ(メタ)アリルエーテル及びそのハロゲン置換体;(メタ)アリル-2-ヒドロキシエチルチオエーテル、(メタ)アリル-2-ヒドロキシプロピルチオエーテルなどのアルキレングリコールの(メタ)アリルチオエーテル類;などが挙げられる。
N-ビニルピロリドン、ビニルピリジン、ビニルイミダゾール等の複素環含有ビニル化合物;アクリルアミド、アクリルアミド-2-メチルプロパンスルホン酸などのアミド系単量体;が挙げられる。
本発明の多孔膜は、上記非導電性粒子および結着剤に加えて、スルホン酸基を有する水溶性重合体を含む。水溶性重合体は、後述する多孔膜用スラリーにおいて、非導電性粒子の分散性をより改善するために用いられる。これは、溶媒である水に溶解した水溶性重合体が非導電性粒子の表面に吸着して該表面を覆うことにより、非導電性粒子の凝集が抑制されるためと考えられる。このようにスラリー中の非導電性粒子の分散性を改善できるので、多孔膜用スラリーは経時安定性が改善され、長期間保存しても非導電性粒子の凝集粒子径が大きく変化することが少ない。また、かかるスラリーを用いて得られる多孔膜においても、非導電性粒子の分散性が維持されるため、均一で比較的膜厚の薄い多孔膜が得られる。さらに、多孔膜を製造する際に水溶性重合体中のスルホン酸基により、結着剤との間に架橋構造が形成され、それにより得られる多孔膜の強度(特に、硬さ)をより強くすることができる。
本発明の多孔膜は、上記非電導性粒子、結着剤および水溶性重合体を含み、さらに界面活性剤、粘度調整剤、消泡剤や電解液分解抑制等の機能を有する電解液添加剤等の他の成分が含まれていてもよい。これらは電池反応に影響を及ぼさないものであれば特に限られない。これらは、多孔膜用スラリーの安定性向上のために添加される成分や、電池性能の向上のために添加される成分を含む。
陰イオン界面活性としては、セッケン、アルキルベンゼンスルホン酸塩、高級アルコール硫酸エステル塩、ポリオキシエチレンアルキルエーテル硫酸塩、α-スルホ脂肪酸エステル、α-オレフィンスルホン酸塩、モノアルキルリン酸エステル塩、アルカンスルホン酸塩があげられる。
両性界面活性剤としてはアルキルアミノ脂肪酸塩、アルキルベタイン、アルキルアミンオキシドがあげられる。
界面活性剤を混合することにより、塗工時に発生するはじきを防止したり、電極の平滑性を向上させることができる。
本発明の多孔膜用スラリーに用いる分散媒としては、水が用いられる。分散媒として水を用いると、水に溶解した水溶性重合体が非導電性粒子の表面に吸着して該表面を覆うことにより、非導電性粒子の凝集が抑制されると考えられる。このため、スラリー中の非導電性粒子の分散性を改善できるので、多孔膜用スラリーは経時安定性が向上する。
(1)使用する粘度調整剤として、粘度調整剤の固形分濃度1%のときの粘度が10~8000mPa・s、好ましくは20~5000mPa・s、より好ましくは50~1000mPa・sの範囲にある粘度調整剤を用いる。
(2)使用する粘度調整剤の添加量を調整する。
(3)スラリーの固形分濃度を調整する。
などの手段があげられる。
本発明の二次電池用電極は、電極合剤層用バインダー及び電極活物質を含んでなる電極合剤層が、集電体に付着してなり、かつ電極合剤層上に、上記多孔膜を有する。本発明の二次電池用電極は、前記電極合剤層上に、上記多孔膜用スラリーを塗布・乾燥することにより形成されてなる多孔膜を有する。
電極合剤層用結着剤としては、様々な樹脂成分を用いることができる。例えば、ポリエチレン、ポリテトラフルオロエチレン(PTFE)、ポリフッ化ビニリデン(PVDF)、テトラフルオロエチレン-ヘキサフルオロプロピレン共重合体(FEP)、ポリアクリル酸誘導体、ポリアクリロニトリル誘導体などを用いることができる。これらは単独で用いてもよく、2種以上を組み合わせて用いてもよい。
ポリブチルアクリレート、ポリブチルメタクリレート、ポリヒドロキシエチルメタクリレート、ポリアクリルアミド、ポリアクリロニトリル、ブチルアクリレート・スチレン共重合体、ブチルアクリレート・アクリロニトリル共重合体、ブチルアクリレート・アクリロニトリル・グリシジルメタクリレート共重合体などの、アクリル酸またはメタクリル酸誘導体の単独重合体またはそれと共重合可能な単量体との共重合体である、アクリル系軟質重合体;
ポリイソブチレン、イソブチレン・イソプレンゴム、イソブチレン・スチレン共重合体などのイソブチレン系軟質重合体;
ポリブタジエン、ポリイソプレン、ブタジエン・スチレンランダム共重合体、イソプレン・スチレンランダム共重合体、アクリロニトリル・ブタジエン共重合体、アクリロニトリル・ブタジエン・スチレン共重合体、ブタジエン・スチレン・ブロック共重合体、スチレン・ブタジエン・スチレン・ブロック共重合体、イソプレン・スチレン・ブロック共重合体、スチレン・イソプレン・スチレン・ブロック共重合体などジエン系軟質重合体;
ジメチルポリシロキサン、ジフェニルポリシロキサン、ジヒドロキシポリシロキサンなどのケイ素含有軟質重合体;
液状ポリエチレン、ポリプロピレン、ポリ-1-ブテン、エチレン・α-オレフィン共重合体、プロピレン・α-オレフィン共重合体、エチレン・プロピレン・ジエン共重合体(EPDM)、エチレン・プロピレン・スチレン共重合体などのオレフィン系軟質重合体;
ポリビニルアルコール、ポリ酢酸ビニル、ポリステアリン酸ビニル、酢酸ビニル・スチレン共重合体などビニル系軟質重合体;
ポリエチレンオキシド、ポリプロピレンオキシド、エピクロルヒドリンゴムなどのエポキシ系軟質重合体;
フッ化ビニリデン系ゴム、四フッ化エチレン-プロピレンゴムなどのフッ素含有軟質重合体;
天然ゴム、ポリペプチド、蛋白質、ポリエステル系熱可塑性エラストマー、塩化ビニル系熱可塑性エラストマー、ポリアミド系熱可塑性エラストマーなどのその他の軟質重合体などが挙げられる。これらの軟質重合体は、架橋構造を有したものであってもよく、また、変性により官能基を導入したものであってもよい。
回転数60rpmで測定した時の値である。
リチウムイオン二次電池用電極に用いられる電極活物質は、電解質中で電位をかける事により可逆的にリチウムイオンを挿入放出できるものであればよく、無機化合物でも有機化合物でも用いることができる。
本発明に用いる有機セパレータとしては、電子伝導性がなくイオン伝導性があり、有機溶媒の耐性が高い、孔径の微細な多孔質膜が用いられ、例えばポリオレフィン系(ポリエチレン、ポリプロピレン、ポリブテン、ポリ塩化ビニル)、及びこれらの混合物あるいは共重合体等の樹脂からなる微多孔膜、ポリエチレンテレフタレート、ポリシクロオレフィン、ポリエーテルスルフォン、ポリアミド、ポリイミド、ポリイミドアミド、ポリアラミド、ポリシクロオレフィン、ナイロン、ポリテトラフルオロエチレン等の樹脂からなる微多孔膜またはポリオレフィン系の繊維を織ったもの、またはその不織布、絶縁性物質粒子の集合体等が挙げられる。これらの中でも、多孔膜用スラリーの塗工性が優れ、セパレータ膜厚を薄くし電池内の活物質比率を上げて体積あたりの容量を上げることができるため、ポリオレフィン系の樹脂からなる微多孔膜が好ましい。
熱風、低湿風による乾燥、真空乾燥、(遠)赤外線や電子線などの照射による乾燥法を用いることができる。
本発明の二次電池は、正極、負極、セパレータ及び電解液を備えてなり、前記正極、負極の少なくとも一方が、前記二次電池用電極である(以下、「第一の二次電池」と記載することがある。)。
リチウムイオン二次電池用の電解液としては、有機溶媒に支持電解質を溶解した有機電解液が用いられる。支持電解質としては、リチウム塩が用いられる。リチウム塩としては、特に制限はないが、LiPF6、LiAsF6、LiBF4、LiSbF6、LiAlCl4、LiClO4、CF3SO3Li、C4F9SO3Li、CF3COOLi、(CF3CO)2NLi、(CF3SO2)2NLi、(C2F5SO2)NLiなどが挙げられる。中でも、溶媒に溶けやすく高い解離度を示すLiPF6、LiClO4、CF3SO3Liが好ましい。これらは、二種以上を併用してもよい。解離度の高い支持電解質を用いるほどリチウムイオン伝導度が高くなるので、支持電解質の種類によりリチウムイオン伝導度を調節することができる。
以下に、実施例を挙げて本発明を説明するが、本発明はこれに限定されるものではない。尚、本実施例における部および%は、特記しない限り質量基準である。
実施例および比較例において、各種物性は以下のように評価する。
非導電性粒子の体積平均粒子径は、レーザ回折式粒度分布測定装置(SALD-2000:島津製作所社製)で測定する。
非導電性粒子の長径L、幅b、厚さtは、走査型電子顕微鏡(SEM)で観察を行い、
印刷した写真から直接測定する。これらを、無作為に300個測定して、これらの平均値として求める。
レーザ回折式粒度分布測定装置(SALD-2000:島津製作所社製)を用いて、調整後の多孔膜用スラリーの非導電性粒子の体積平均粒子径D50を求め、下記の基準でスラリーの分散性を判定する。スラリー中の非導電性粒子の体積平均粒子径D50が非導電性粒子の1次粒子径に近いほど、分散性に優れることを示す。
SA:スラリー中の非導電性粒子の体積平均粒子径D50が、非導電性粒子の一次粒子径の1.2倍未満である。
A:スラリー中の非導電性粒子の体積平均粒子径D50が、非導電性粒子の一次粒子径の1.2倍以上1.4未満である。
B:スラリー中の非導電性粒子の体積平均粒子径D50が、非導電性粒子の一次粒子径の1.4倍以上1.6倍未満である。
C:スラリー中の非導電性粒子の体積平均粒子径D50が、非導電性粒子の一次粒子径の1.6倍以上1.8倍未満である。
D:スラリー中の非導電性粒子の体積平均粒子径D50が、非導電性粒子の一次粒子径の1.8倍以上2.0倍未満である。
E:スラリー中の非導電性粒子の体積平均粒子径D50が、非導電性粒子の一次粒子径の2.0倍以上である。
レーザ回折式粒度分布測定装置(SALD-2000:島津製作所社製)を用いて、多孔膜用スラリー調製1日後の体積平均粒子径(d501)と5日後の体積平均粒子径(d505)を測定し、スラリー中の非導電性粒子の体積粒子径変化率(=d505/d501)を求め、下記の基準でスラリーの凝集性を判定する。体積平均粒子径の変化率が小さいほど、スラリー保存安定性に優れることを示す。
SA:体積平均粒子径D50の変化率が1.2倍未満である
A:体積平均粒子径D50の変化率が1.2倍以上、1.4倍未満である。
B:体積平均粒子径D50の変化率が1.4倍以上1.6倍未満である。
C:体積平均粒子径D50の変化率が1.6倍以上1.8倍未満である。
D:体積平均粒子径D50の変化率が1.8倍以上2.0倍未満である。
E:体積平均粒子径D50の変化率が2.0倍以上である。
多孔膜用スラリーの粘度は、JIS Z8803:1991に準じて、円すい-板形回転粘度計(25℃、回転数:6rpm、60rpm、プレートNo:42)により測定し、測定開始60秒後の値を求める。
TI値(チクソトロピックインデックス値)は、回転数6rpm、60秒後の粘度η6と、回転数60rpm、60秒後の粘度η60から、下記式(1)を用いて算出する。
TI値=η6/η60 (1)
多孔膜付電極または多孔膜付セパレータを、幅1cm×長さ5cmの矩形に切って試験片とする。試験片の多孔膜側の面を上にして机上に置き、長さ方向の中央(端部から2.5cmの位置)の集電体、または有機セパレータ側の面に、直径1mmのステンレス棒を短手方向に横たえて設置する。このステンレス棒を中心にして、試験片を多孔膜が外側になるように180°折り曲げる。以上の試験を10枚の試験片について行い、各試験片の多孔膜の折り曲げた部分について、ひび割れまたは粉落ちの有無を観察し、下記の基準により判定する。ひび割れ、剥がれ粉落ちが少ないほど、電極合剤層上または有機セパレータ上に形成した多孔膜が粉落ち性に優れることを示す。なお、多孔膜付セパレータにおいて、有機セパレータの両面に多孔膜が形成されている場合は、最初に形成した多孔膜について粉落ち性を評価する。
SA:10枚中全てに、ひび割れ及び粉落ちがみられない。
A:10枚中1、2枚に、ひび割れまたは粉落ちがみられる。
B:10枚中3、4枚に、ひび割れまたは粉落ちがみられる。
C:10枚中5、6枚に、ひび割れまたは粉落ちがみられる。
D:10枚中7、8枚に、ひび割れまたは粉落ちがみられる。
E:10枚中9枚以上に、ひび割れまたは粉落ちがみられる。
元の基材(有機セパレータ)および多孔膜付セパレータを、ガーレー測定器(熊谷理機工業製 SMOOTH & POROSITY METER(測定径:φ2.9cm))を用いてガーレー値(sec/100cc)を測定する。これにより、多孔膜を設けることで、元の基材(有機セパレータ)からガーレー値が増加する割合を求め、下記の基準により判定する。ガーレー値の増加率が低いほどイオンの透過性に優れ、電池でのレート特性に優れることを示す。
SA:ガーレー値の増加率が4%未満である。
A:ガーレー値の増加率が4%以上8%未満である。
B:ガーレー値の増加率が8%以上12%未満である
C:ガーレー値の増加率が12%以上16%未満である
D:ガーレー値の増加率が16%以上20%未満である。
E:ガーレー値の増加率が20%以上である。
多孔膜付セパレータを、幅5cm×長さ5cmの正方形に切って試験片とする。試験片を150℃の恒温槽に入れ1時間放置した後、正方形の面積変化を熱収縮率として求めた。以上の試験を5枚の試験片について行い、各試験片の熱収縮率を求め下記の基準により判定する。熱収縮率が小さいほどセパレータの熱収縮性が優れることを示す。
SA:5枚中全ての熱収縮率が1%未満である。
A:5枚中、1枚の熱収縮率が1%以上である。
B:5枚中、2枚の熱収縮率が1%以上である。
C:5枚中、3枚の熱収縮率が1%以上である。
D:5枚中、4枚の熱収縮率が1%以上である。
E:5枚全ての熱収縮率が1%以上である。
10セルのフルセルコイン型電池を60℃雰囲気下、0.2Cの定電流法によって4.2Vに充電し、3.0Vまで放電する充放電を繰り返し電気容量を測定した。10セルの平均値を測定値とし、50サイクル終了時の電気容量と5サイクル終了時の電気容量の比(%)で表される充放電容量保持率を求め、これをサイクル特性の評価基準とする。この値が高いほど高温サイクル特性に優れることを示す。
SA:充放電容量保持率が80%以上である。
A:充放電容量保持率が70%以上80%未満である。
B:充放電容量保持率が60%以上70%未満である。
C:充放電容量保持率が50%以上60%未満である。
D:充放電容量保持率が40%以上50%未満である。
E:充放電容量保持率が30%以上40%未満である。
F:充放電容量保持率が30%未満である。
10セルのフルセルコイン型電池を用いて、25℃で0.1Cの定電流で4.2Vまで充電し、0.1Cの定電流で3.0Vまで放電する充放電サイクルと、25℃で1.0Cの定電流で3.0Vまで放電する充放電サイクルをそれぞれ行った。0.1Cにおける電池容量に対する1.0Cにおける放電容量の割合を百分率で算出して充放電レート特性とし、下記の基準で判定した。この値が大きいほど、内部抵抗が小さく、高速充放電が可能であることを示す。
SA:充放電レート特性が80%以上である。
A:充放電レート特性が75%以上80%未満である。
B:充放電レート特性が70%以上75%未満である。
C:充放電レート特性が65%以上70%未満である。
D:充放電レート特性が60%以上65%未満である。
E:充放電レート特性が55%以上60%未満である。
F:充放電レート特性が55%未満である。
[非導電性粒子]
(板状アルミナA)
L/bが1.5、b/tが50、Lが5μm、体積平均粒径が0.6μmであるアルミナ粒子
(板状アルミナB)
L/bが1.3、b/tが113、Lが6μm、体積平均粒径が2μmであるアルミナ粒子
(板状アルミナC)
L/bが1.4、b/tが100、Lが10μm、体積平均粒径が5μmであるアルミナ粒子
(粒状アルミナ)
L/bが1.2、b/tが1、Lが1μm、体積平均粒径が0.5μmであるアルミナ粒子
(結着剤を含む水分散液)
撹拌機を備えた反応器に、イオン交換水70部、ドデシルベンゼンスルホン酸ナトリウム0.2部、過流酸アンモニウム0.5部、並びに、乳化剤としてラウリル硫酸ナトリウム(花王ケミカル社製、製品名「エマール2F」)0.15部をそれぞれ供給し、気相部を窒素ガスで置換し、60℃に昇温した。
撹拌機を備えた反応器に、イオン交換水110部、ドデシルベンゼンスルホン酸ナトリウム0.2部、過流酸アンモニウム0.5部、並びに、乳化剤としてラウリル硫酸ナトリウム(花王ケミカル社製、製品名「エマール2F」)0.15部をそれぞれ供給し、気相部を窒素ガスで置換し、60℃に昇温した。
(水溶性重合体A)
攪拌機、還流冷却管および温度計を備えた容量1LのSUS製セパラブルフラスコに、脱塩水249.0gを予め仕込み、90℃にて攪拌しながら、濃度35%のアクリル酸ナトリウム水溶液286g(固形分100g)と、濃度40%の3-アリロキシ-2-ヒドロキシ-1-プロパンスルホン酸ナトリウム水溶液250g(固形分100g)と、濃度5%の過硫酸アンモニウム水溶液200gとを、それぞれ別々に3.5時間かけて滴下した。全ての滴下終了後、さらに30分間にわたって沸点還流状態を維持して重合を完結させ、共重合体である水溶性重合体Aの水溶液を得た。得られた水溶性重合体Aの水溶液を分析したところ、水溶性重合体Aの重量平均分子量は6,000であった。この水溶性重合体Aが含むスルホン酸単位の量は50重量%であり、水溶性重合体A中のスルホン酸基の重量割合は15重量%であった。
アクリル酸ナトリウム水溶液の量を429g(固形分150g)にし、3-アリロキシ-2-ヒドロキシ-1-プロパンスルホン酸ナトリウム水溶液の量を150g(固形分60g)にし、過硫酸アンモニウム水溶液の量を100gにしたこと以外は水溶性重合体Aの製造例と同様にして、共重合体である水溶性重合体Bの水溶液を得た。得られた水溶性重合体Bの水溶液を分析したところ、水溶性重合体Bの重量平均分子量は11,500であった。この水溶性重合体Bが含むスルホン酸単位の量は29重量%であり、水溶性重合体B中のスルホン酸基の重量割合は5重量%であった。
アクリル酸ナトリウム水溶液の量を114g(固形分40g)にし、3-アリロキシ-2-ヒドロキシ-1-プロパンスルホン酸ナトリウム水溶液の量を400g(固形分160g)にし、過硫酸アンモニウム水溶液の量を300gにしたこと以外は水溶性重合体Aの製造例と同様にして、共重合体である水溶性重合体Cの水溶液を得た。得られた水溶性重合体Cの水溶液を分析したところ、水溶性重合体Cの重量平均分子量は4,000であった。この水溶性重合体Cが含むスルホン酸単位の量は80重量%であり、水溶性重合体C中のスルホン酸基の重量割合は23重量%であった。
(界面活性剤A)
ポリオキシアルキレンアルキルエーテル型界面活性剤(サンノプコSNウェット980)(曇点36℃)
(界面活性剤B)
ポリエチレングリコール型界面活性剤(サンノプコSNウェット366)(曇点44℃)
(界面活性剤C)
ポリオキシアルキレンアルキルエーテル型界面活性剤(エマルゲンLS-114)(曇点88℃)
(試料の用意)
非導電性粒子として、L/bで1.5、b/tが50、Lが5μm、体積平均粒径が0.6μmである板状アルミナ粒子Aを用意した。
粘度調整剤として、平均重合度1600~1800、エーテル化度0.65~0.75カルボキシメチルセルロース(第一工業製薬社製、製品名BSH-12)を用いた。なお、粘度調整剤の1%水溶液の粘度は、6000~8000mPa・sであった。
板状アルミナ粒子Aを100部、水溶性重合体Aを0.1部、及び粘度調整剤を0.1部混合し、更に水を固形分濃度が40質量%になるように混合して、ビーズミルを用いて分散させた。その後、結着剤を含む水分散液を固形分相当量で4部となる量、及び界面活性剤Aを0.2部添加し、多孔膜用スラリー1を製造した。なお、水溶性重合体、粘度調整剤、結着剤、界面活性剤の使用量は、いずれも板状アルミナ粒子A100部に対する割合である。
多孔膜用スラリー1について粘度、TI値、分散性及び保存安定性を評価した。
前記多孔膜用スラリー1を、幅300mm、長さ1000m、厚さ15μmの湿式法により製造された単層のポリエチレン製セパレータ上に、乾燥後の厚さが5μmになるようにグラビアコーターを用いて20m/minの速度で塗工し、次いで50℃の乾燥炉で乾燥し、巻き取ることによりポリエチレン製セパレータ上に多孔膜を形成した。
正極活物質としてのスピネル構造を有するマンガン酸リチウム95部に、バインダーとしてのPVDF(ポリフッ化ビニリデン、呉羽化学社製、商品名:KF-1100)を固形分換算量で3部となるように加え、さらに、アセチレンブラック2部、及びN-メチルピロリドン20部を加えて、これらをプラネタリーミキサーで混合して、正極合剤層用スラリーを得た。この正極合剤層用スラリーを、厚さ18μmのアルミニウム箔の片面に塗布し、120℃で3時間乾燥した後、ロールプレスして、全厚みが100μmの正極合剤層を有する正極を得た。
負極活物質としての粒径20μm、比表面積4.2m2/gのグラファイト98部と、バインダーとしてのSBR(スチレン-ブタジエンゴム、ガラス転移温度:-10℃)の固形分換算量1部とを混合し、この混合物にさらにカルボキシメチルセルロース1.0部を混合し、更に溶媒として水を加えて、これらをプラネタリーミキサーで混合し、負極合剤層用スラリーを得た。この負極合剤層用スラリーを、厚さ18μmの銅箔の片面に塗布し、120℃で3時間乾燥した後、ロールプレスして、全厚みが60μmの負極合剤層を有する負極を得た。
上記で得られた正極を直径13mmの円形に切り抜いて、円形の正極を得た。上記で得られた負極を直径14mmの円形に切り抜いて、円形の負極を得た。また、上記で得た多孔膜付有機セパレータを直径18mmの円形に切り抜いて、円形の多孔膜付有機セパレータを得た。
(多孔膜付電極の作製)
前記多孔膜用スラリー1を、実施例1と同様にして得られた負極に、負極合剤層が完全に覆われるように、かつ乾燥後の厚さが5μmとなるようにグラビアコーターを用いて10m/minの速度で塗工し、次いで90℃で乾燥し、巻き取ることにより多孔膜付電極1を得た。得られた多孔膜付電極1の柔軟性および粉落ち性を評価した。その結果を表2に示す。
粘度調整剤の配合量を表1に記載のように変更した以外は、実施例1と同様とした。結果を表2に示す。なお、実施例4では、塗工速度を15m/minとした。
界面活性剤の種類および配合量を表1に記載のように変更した以外は、実施例1と同様とした。結果を表2に示す。
界面活性剤Aに代えて、界面活性剤Bを用い、水溶性重合体の配合量を表1に記載のように変更した以外は、実施例1と同様とした。結果を表2に示す。
界面活性剤を用いなかった以外は、実施例1と同様とした。結果を表2に示す。
界面活性剤Aに代えて、界面活性剤Bを用い、水溶性重合体の種類を表1に記載のように変更した以外は、実施例1と同様とした。結果を表2に示す。
水溶性重合体の種類を表1に記載のように変更した以外は、実施例1と同様とした。結果を表2に示す。
板状アルミナ粒子Aに代えて、板状アルミナ粒子Bを用いた以外は、実施例1と同様とした。結果を表2に示す。
板状アルミナ粒子Aに代えて、板状アルミナ粒子Cを用いた以外は、実施例1と同様とした。結果を表2に示す。
界面活性剤Aに代えて、界面活性剤Bを用い、水溶性重合体を配合しなかった以外は、実施例1と同様とした。結果を表2に示す。
板状アルミナ粒子を100部、結着剤のNMP溶液を25部、更にN-メチルピロリドンを固形分濃度が40%になるように混合して、ビーズミルを用いて分散させ多孔膜用スラリー2を製造した。
多孔膜用スラリー1に代えて、上記多孔膜用スラリー2を用いた以外は、実施例1と同様とした。結果を表2に示す。
水溶性重合体、界面活性剤、及び粘度調整剤を配合しなかった以外は、実施例2と同様とした。結果を表2に示す。
Claims (18)
- 非導電性粒子、結着剤および水溶性重合体を含んでなり、
前記非導電性粒子の3軸径を、長径L、厚さt、幅bとしたとき、長径Lが0.1~20μm、幅bと厚さtとの比(b/t)が1.5~100であり、
前記結着剤が、(メタ)アクリロニトリル単量体単位及び(メタ)アクリル酸エステル単量体単位を含む共重合体であり、
前記水溶性重合体が、スルホン酸基を含み、重量平均分子量が1000~15000である二次電池用多孔膜。 - 前記共重合体中の(メタ)アクリロニトリル単量体単位と(メタ)アクリル酸エステル単量体単位との比率(=(メタ)アクリロニトリル単量体単位/(メタ)アクリル酸エステル単量体単位)が、質量比で1/99~20/80の範囲にある請求項1に記載の二次電池用多孔膜。
- 前記結着剤が、加熱またはエネルギー照射により架橋可能なものである請求項1または2に記載の二次電池用多孔膜。
- 前記共重合体が、熱架橋性の架橋性基を含み、前記熱架橋性の架橋性基が、エポキシ基、N-メチロールアミド基、及びオキサゾリン基からなる群から選ばれる少なくとも1種である請求項1~3のいずれかに記載の二次電池用多孔膜。
- 前記共重合体が、カルボン酸基、水酸基及びスルホン酸基からなる群から選ばれる親水性基を含む請求項1~4のいずれかに記載の二次電池用多孔膜。
- 前記水溶性重合体における、前記スルホン酸を有する繰り返し単位の量が、スルホン酸基含有単量体量で、25重量%以上90重量%である請求項1~5のいずれかに記載の二次電池用多孔膜。
- 前記水溶性重合体が、カルボキシル基を有する繰り返し単位を含む請求項1~6のいずれかに記載の二次電池用多孔膜。
- 前記結着剤の含有量が、非導電性粒子100質量部に対し、0.1~20質量部であり、
前記水溶性重合体の含有量が、非導電性粒子100質量部に対し、0.01~0.8質量部である、
請求項1~7のいずれかに記載の二次電池用多孔膜。 - さらに、曇点30~90℃の非イオン界面活性剤を含む請求項1~8のいずれかに記載の二次電池用多孔膜。
- 非導電性粒子、結着剤、水溶性重合体および水を含んでなり、
前記非導電性粒子の3軸径を、長径L、厚さt、幅bとしたとき、長径Lが0.1~20μm、幅bと厚さtとの比(b/t)が1.5~100であり、
前記結着剤が、(メタ)アクリロニトリル単量体単位及び(メタ)アクリル酸エステル単量体単位を含む共重合体であり、
前記水溶性重合体が、スルホン酸基を含み、重量平均分子量が1000~15000である二次電池多孔膜用スラリー。 - 前記多孔膜スラリーのTI値が1.1~3.0である請求項10に記載の二次電池多孔膜用スラリー。
- 前記共重合体中の(メタ)アクリロニトリル単量体単位と(メタ)アクリル酸エステル単量体単位との比率(=(メタ)アクリロニトリル単量体単位/(メタ)アクリル酸エステル単量体単位)が、質量比で1/99~20/80の範囲にある請求項10又は11に記載の二次電池多孔膜用スラリー。
- 前記結着剤が、加熱またはエネルギー照射により架橋可能なものである請求項10~13のいずれかに記載の二次電池用多孔膜用スラリー。
- 前記共重合体が、熱架橋性の架橋性基を含み、前記熱架橋性の架橋性基が、エポキシ基、N-メチロールアミド基、及びオキサゾリン基からなる群から選ばれる少なくとも1種である請求項10~13のいずれかに記載の二次電池用多孔膜用スラリー。
- 電極合剤層用、結着剤及び電極活物質を含んでなる電極合剤層が、集電体に付着してなり、かつ電極合剤層上に、請求項1~9のいずれかに記載の多孔膜を有する二次電池用電極。
- 有機セパレータ上に、請求項1~9のいずれかに記載の多孔膜を有する二次電池用セパレータ。
- 正極、負極、セパレータ及び電解液を備えてなり、前記正極、負極の少なくとも一方が、請求項15に記載の二次電池用電極である、二次電池。
- 正極、負極、セパレータ及び電解液を備えてなり、前記セパレータが、請求項16に記載の二次電池用セパレータである、二次電池。
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