WO2000056815A1 - Composition pour polymere solide a conductivite ionique, polyelectrolyte solide a conductivite ionique, resine de liaison et batterie secondaire - Google Patents
Composition pour polymere solide a conductivite ionique, polyelectrolyte solide a conductivite ionique, resine de liaison et batterie secondaire Download PDFInfo
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- WO2000056815A1 WO2000056815A1 PCT/JP2000/001734 JP0001734W WO0056815A1 WO 2000056815 A1 WO2000056815 A1 WO 2000056815A1 JP 0001734 W JP0001734 W JP 0001734W WO 0056815 A1 WO0056815 A1 WO 0056815A1
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- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/30—Introducing nitrogen atoms or nitrogen-containing groups
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/06—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances
- H01B1/12—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances organic substances
- H01B1/122—Ionic conductors
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- 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
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- 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
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- 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
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
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- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2810/00—Chemical modification of a polymer
- C08F2810/20—Chemical modification of a polymer leading to a crosslinking, either explicitly or inherently
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2810/00—Chemical modification of a polymer
- C08F2810/30—Chemical modification of a polymer leading to the formation or introduction of aliphatic or alicyclic unsaturated groups
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- 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
- Ion-conductive solid polymer composition Ion-conductive solid polymer composition, ionic-conductive solid polymer electrolyte, binder resin and secondary battery
- the present invention relates to a composition for an ionic conductive solid polymer having high ion conductivity, high adhesiveness, and excellent shape retention, an ionic conductive solid polymer electrolyte, a binder resin, and a secondary battery.
- low-molecular substances that are liquid at a temperature close to room temperature or higher, such as water, ethylene carbonate, propylene carbonate, and tetrahydrofuran, have been used as electrolytes for secondary batteries and the like.
- lithium-based batteries often use low-molecular-weight organic liquid electrolytes that easily evaporate, ignite, or burn.
- use metal cans on the battery exterior and use containers. Therefore, it is necessary to increase the airtightness, and thus, the electric element and the electronic element using the low molecular weight organic liquid electrolyte have the disadvantage that the weight becomes heavy and the manufacturing process becomes complicated.
- the most studied polyethylene oxide is a polymer that has a high ability to dissolve ionic conductive salts as described above, but is a semi-crystalline polymer and dissolves a large amount of metal salts.
- these metal salts form a pseudo-crosslinked structure between the polymer chains, the polymer crystallizes, and the ionic conductivity is much lower than expected.
- a ionic conductor dissolved in a linear polyether polymer matrix such as polyethylene oxide forms a local portion of the polymer chain in an amorphous region in the polymer matrix. Move with a typical segmental movement.
- the ionic conductivity, thione is strongly coordinated by the polymer chain, and its mobility is significantly reduced, so that the conductivity is also reduced.
- This local motion of the polymer chains is called Brownian motion. Therefore, as a matrix polymer of an ionic conductive polymer electrolyte, a linear polymer such as polyethylene oxide is used. It is not advisable to select a linear polyether polymer.
- ionic conductive polymer electrolytes consisting only of linear polymers such as polyethylene oxide, polypropylene oxide, and polyethyleneimine have an ionic conductivity of 10 at room temperature.
- the present inventor has previously introduced a polyoxyalkylene branched chain into a natural polymer such as cellulose and blocked the terminal hydroxyl group with an appropriate substituent to thereby provide a high ionic conductivity. It has been reported that a polymer for a molecular electrolyte can be obtained, and that a solid polymer electrolyte having excellent strength and high conductivity can be obtained by using the polymer (Japanese Patent Application Laid-Open No. H8-208). No. 2,256,266, Japanese Patent Application Laid-Open No. 9-50824).
- the solid polymer electrolyte obtained by introducing a polyoxyalkylene branched chain into the above-mentioned natural polymer substance such as cellulose has the following disadvantages. (1) Since the molecular weight per polymer chain (main chain) unit is large, the ionic conductivity per unit weight is high. However, there are problems that it is difficult to further increase the fraction of the polyoxyalkylene portion which dissolves and migrates, and that (2) the tackiness tends to be slightly inferior. Disclosure of the invention
- the present invention has been made in view of the above circumstances, and has high ionic conductivity, high adhesiveness, a semi-interpenetrating polymer network (semi-IPN) structure, and ionic conductivity with excellent shape retention.
- An object of the present invention is to provide a composition for a solid polymer, an ion-conductive solid polymer electrolyte, a binder resin, and a secondary battery.
- the inventor has conducted intensive studies to achieve the above object, and as a result, In order to further enhance the ionic conductivity of the polymer for the polymer electrolyte, it is effective to increase the introduction ratio of the polyoxyalkylene moiety in which the ionic conductive salt can be dissolved per unit weight of the polymer for the polymer electrolyte. was found.
- PVA polyvinyl alcohol
- a film battery using a solid polymer electrolyte has a positive electrode Z solid electrolyte / negative electrode configuration, unlike a cylindrical battery in which this positive electrode Z solid electrolyte / negative electrode composite is rolled into a can.
- a film battery since no winding pressure is applied, no pressure is applied between the positive electrode and the solid electrolyte, and no pressure is applied between the solid electrolyte and the negative electrode, so that the positive and negative electrodes and the solid electrolyte are easily separated from each other.
- the solid electrolyte to be provided must have a function of firmly bonding the positive and negative electrodes, that is, adhesiveness.
- A a polymer compound having a polyvinyl alcohol unit represented by the following general formula (1) in a molecule and having an average degree of polymerization of 20 or more, wherein part or all of the hydroxyl groups in the polyvinyl alcohol unit is an average molar substitution; Ionic conductivity mainly composed of a polymer compound substituted with an oxyalkylene-containing group having a degree of not less than 0.3, (B) an ion conductive salt, and (C) a compound having a crosslinkable functional group.
- A a polymer compound having a polyvinyl alcohol unit represented by the following general formula (1) in a molecule and having an average degree of polymerization of 20 or more, wherein part or all of the hydroxyl groups in the polyvinyl alcohol unit is an average molar substitution; Ionic conductivity mainly composed of a polymer compound substituted with an oxyalkylene-containing group having a degree of not less than 0.3, (B) an ion conductive salt, and (C) a
- the composition for a conductive solid polymer has a high oxyalkylene fraction, it has the ability to dissolve many ionic conductive salts, and the number of oxyalkylene moieties to which ions move in the molecule increases. Ion transfer is slowed down, and as a result, high ionic conductivity can be exhibited, high tackiness can be achieved, and a role as a binder component and a function of firmly bonding the positive and negative electrodes can be sufficiently exhibited.
- the three-dimensional network structure of the polymer obtained by crosslinking the compound of the component (C) has a semi-interpenetrating i3 ⁇ 4 molecular network in which the molecular chains of the polymer compound of the component (A) are entangled with each other.
- the semi-interpolating polymer network (semi-IPN)) structure and the ionic conductive solid polymer electrolyte containing the ionic conductive salt of the component (B) have a remarkable shape retention ability.
- the crystal structure is Since it is not formed and the matrix is amorphous (amorphous), it has high ionic conductivity and high adhesiveness, and is particularly suitable as an ionic conductive solid polymer electrolyte for secondary batteries such as film batteries.
- the present invention has been completed.
- a polymer compound having an average degree of polymerization of 20 or more and having a polyvinyl alcohol unit represented by the following general formula (1) in the molecule a part or a part of the hydroxyl group in the polyvinyl alcohol unit is used.
- n a number of 20 or more.
- the semi-interpenetrating polymer network structure in which the molecular chains of the polymer compound (A) are entangled with the three-dimensional network structure of the polymer obtained by crosslinking the compound (C). And an ion-conductive solid polymer electrolyte comprising the ion-conductive salt of the component (B).
- the ionic conductive solid is used as the solid polymer electrolyte layer.
- a secondary battery comprising a polymer electrolyte and this layer interposed between a positive electrode and a negative electrode.
- Figure 1 is a 1 3 C-NMR spectrum of the dihydric Dorokishipuro pills poly Binirua alcohol of Synthesis Example 1 of the present invention.
- FIG. 2 is a wide-angle X-ray diagram of a composition (composite) comprising the polymer derivative of Synthesis Example 8 and lithium perchlorate.
- composition for an ion-conductive solid polymer of the present invention comprises (A) a polymer compound having a polyvinyl alcohol unit having an oxyalkylene chain, (B) an ion-conductive salt, and (C) a crosslinkable functional group. And a compound having the following formula:
- the high molecular compound of the component (A) is a high molecular compound having an average degree of polymerization of 20 or more, preferably 30 or more, more preferably 50 or more having a polyvinyl alcohol unit in the molecule.
- a hydroxyl group in a polyvinyl alcohol unit is partly or wholly substituted with an oxyalkylene-containing group.
- the upper limit of the average degree of polymerization is preferably at most 200, particularly preferably at most 200.
- the average degree of polymerization here is a number average degree of polymerization.
- a polymer having an excessively high degree of polymerization has a too high viscosity and is difficult to handle. Therefore, the preferable range of the degree of polymerization is from 20 to 500-mers.
- the polyvinyl alcohol unit constitutes the main chain of the polymer compound of the present invention, and is represented by the following general formula (1). ⁇ CH 2-CH ⁇ -...
- ⁇ is 20 or more, preferably 30 or more, more preferably 50 or more, and the upper limit is preferably 200 or less, particularly preferably 200 or less. .
- the high molecular compound having a polyvinyl alcohol unit of the present invention is preferably a homopolymer that satisfies the above average polymerization degree range and has a polyvinyl alcohol unit fraction of 98 mol% or more in the molecule.
- Polyvinyl formal in which some of the hydroxyl groups of coal are formalized, modified polyvinyl alcohol in which some of the hydroxyl groups in polyvinyl alcohol are alkylated, poly (ethylene pinyl alcohol), partially saponified polyvinyl acetate, Other modified polyvinyl alcohols and the like can be used.
- the polymer compound of the present invention is an oxyalkylene-containing group in which part or all of the hydroxyl groups in the polyvinyl alcohol unit has an average molar degree of substitution of 0.3 or more.
- a part of the hydrogen atoms may be substituted by a hydroxyl group), preferably at least 30 mol%, more preferably at least 50 mol%. preferable.
- the average molar substitution degree (MS) can be calculated by accurately measuring the charged weight and the weight of the reaction product. For example, consider the case where PVA Og is reacted with ethylene oxide, and the amount of the obtained PVA derivative is 15 g. Since the unit of PVA is one (CH 2 CH (OH)) one, the unit molecular weight is 44. On the other hand, PVA derived which is a reaction product, - (CH 2 CH (OH )) - Bruno - OH groups are one O- (CH 2 CH Ii) Since it is an n -H group, its unit molecular weight is 4 4 + 4 4 n. Therefore, the weight increase accompanying the reaction is equivalent to 44 ⁇ , and is as follows.
- the method for introducing an oxyalkylene-containing group into the polymer compound having a polyvinyl alcohol unit is as follows: (1) reacting an oxysilane compound such as ethylene oxide with the polymer compound having a polyvinyl alcohol unit. Or (2) a method in which a polymer compound having a polyvinyl alcohol unit is reacted with a polyoxyalkylene compound having a substituent having reactivity with a hydroxyl group at a terminal.
- one kind selected from ethylene oxide, propylene oxide and glycidol is used alone or as an oxysilane compound. Two or more kinds can be used in combination.
- an oxypropylene chain is usually introduced as shown by the following formula.
- the reaction between the hydroxyl group of PVA and glycidol can be of two types: a-attack and b-attack.
- a-attack When one glycidol reacts, two new hydroxyl groups are generated, and the hydroxyl groups react with the glycidol again.
- the following two branches (1) and (2) are introduced on the hydroxyl group of the PVA unit.
- PVA-OH hydroxyl group of PVA unit
- x + y is preferably from 1 to 10, more preferably from 1 to 5.
- the reaction between the polymer compound having a polyvinyl alcohol unit and the above oxylan compound can be carried out using a basic catalyst such as sodium hydroxide, potassium hydroxide, and various amide compounds. it can.
- a solvent and polyvinyl alcohol are charged in a reaction vessel.
- the polyvinyl alcohol does not necessarily need to be dissolved in the solvent, and may be uniformly dissolved, or the polyvinyl alcohol may be in a suspended state in the solvent.
- a predetermined amount of a basic catalyst for example, an aqueous solution of sodium hydroxide is added to this solution, and the mixture is stirred for a while, and then glycidol diluted with a solvent is added. After reacting at the specified temperature for the specified time, take out the polyvinyl alcohol. If polyvinyl alcohol is not dissolved, filter it off using a glass filter.
- Purification can be achieved by dissolving in water for neutralization, passing through an ion exchange resin, or dialysis, and freeze-drying to obtain dihydroxyl-opened pilled polyvinyl alcohol.
- the reaction ratio between the polyvinyl alcohol and the oxysilane compound is preferably 1:10, more preferably 1:20, in molar ratio.
- polyoxyalkylene compound having a substituent having a reactivity with a hydroxyl group at the terminal of (2) a compound represented by the following general formula (2) can be used.
- A is a monovalent substituent reactive with a hydroxyl group, for example, an isocyanate group, an epoxy group, a carboxylic acid group, a carboxylic acid chloride group, an ester group, an amide group, and fluorine.
- an isocyanate group for example, an epoxy group, a carboxylic acid group, a carboxylic acid chloride group, an ester group, an amide group, and fluorine.
- isocyanate groups, epoxy groups, Carboxyl chloride groups are preferred.
- carboxylic acid group may be an acid anhydride.
- ester group a methyl ester group and an ethyl ester group are preferable.
- silicon-containing reactive substituent include those having a SiH group, a SiOH group or the like at the terminal.
- the above-mentioned reactive group with a hydroxyl group such as an isocyanate group and an epoxy group may be directly bonded to the oxyalkylene group of R 20, and may be an oxygen atom, a sulfur atom, a carbonyl group, a carbonyloxy group, group, N (CH 3) group, N (C 2 H 5) nitrogen-containing groups such as groups, may be S 0 2 group or the like is interposed, preferably 1 to carbon atoms 1 0, especially 1 to 6 alkylene of It may be bonded to the oxyalkylene group of R 20 via a group, an alkenylene group, an arylene group or the like.
- a polyisocyanate compound is added to a terminal hydroxyl group of the polyoxyalkylene group.
- the compound having an isocyanate group includes, for example, tolylene diisocyanate, xylylene diisocyanate, naphthylene diisocyanate, diphenylmethane diisocyanate, biphenylenediisocyanate, diphenyl etherate.
- Compounds having two or more isocyanate groups in a molecule such as rudiisocyanate, trizine diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate, can be used.
- compounds obtained by the following reaction can be used.
- R 2 ⁇ is an oxyalkylene group having 2 to 5 carbon atoms, for example, one CH 2 CH 2 O—, one CH 2 CH 2 CH 20 _, -CH 2 CH (CH 3 ) ⁇ —, one CH 2 CH ( CH 2 CH 3) O—, — CH 2 CH 2 CH 2 CH 2, etc.
- m represents the number of added moles of the oxyalkylene group, and the number of added moles (m) is preferably 1 to: L 00, more preferably 1 to 50 o
- polyoxyalkylene chain represented by the above formula (R 20 ) m in particular, a polyethylene glycol chain, a polypropylene glycol chain, or a polyethylene oxide (E 0) Z polypropylene oxide (PO) copolymer chains are preferred.
- the weight average molecular weight of these polyoxyalkylene chains is preferably in the range of 100 to 300, more preferably in the range of 200 to 100000, which is a molecular region that becomes a liquid state at room temperature. Are preferred.
- R 3 is a one-end blocking group, a hydrogen atom or an unsubstituted or substituted monovalent hydrocarbon group having 1 to 10 carbon atoms, or an R 4 C ⁇ — group (R 4 is a non-substituted carbon atom having 1 to 10 carbon atoms; Substituted or substituted monovalent hydrocarbon group).
- Examples of the unsubstituted or substituted monovalent hydrocarbon group having 1 to 10 carbon atoms include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a tert-butyl group, a pentyl group and a neopentyl group. , Hexyl, cyclohexyl, octyl, nonyl, decyl and other alkyl groups, phenyl, tolyl, xylyl and other aryl groups, and benzyl, phenylethyl and phenylpropyl groups and other aralkyl groups.
- R 2 is an alkylene group having 2 to 4 carbon atoms, and z is Substituted by an amino group, an aminoalkyl group, a phosphono group, etc., for example, a cyanoethyl group, a cyanobenzyl group, a substituent in which a cyano group is bonded to another alkyl group, chloromethyl Group, chloropropyl group, bromoethyl group, trifluoropropyl group and the like, and one of these can be used alone or in combination of two or more.
- R 4 is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 10 carbon atoms, and preferably, R 4 is an alkyl group optionally substituted by a cyano group. Or a phenyl group, preferably an acyl group, a benzoyl group, a cyanobenzoyl group or the like.
- the reaction between the polymer compound having a polyvinyl alcohol unit and the polyoxyalkylene compound having a substituent having reactivity with the hydroxyl group at the terminal can be carried out in the same manner as in the case of the oxysilane compound.
- a substituent having a reactivity between polyvinyl alcohol and a hydroxyl group is added.
- the reaction ratio with the polyoxyalkylene compound at the terminal is preferably 1: 1 to 1:20, more preferably 1: 1 to 1:10 in a molar ratio.
- the structure of the polymer compound into which the oxyalkylene-containing group has been introduced can be confirmed by 13 C-NMR. For example, by reacting glycidol polyvinyl alcohol dihydric Dorokishipuro pills polyvinyl alcohol 1 3 C-NMR
- the number of oxyalkylene groups of the polymer compound having a polyvinyl alcohol unit having an oxyalkylene chain of the present invention can be analyzed by various methods such as NMR and elemental analysis.
- a simple method is to obtain from the weight increase of the polymer produced by the reaction with the charged polymer.
- the method for obtaining from the yield is to accurately calculate the amount of the polymer compound having a polyvinyl alcohol unit and the weight of the polymer compound having a polypinyl alcohol unit having an oxyalkylene group obtained by the reaction.
- the amount of the introduced oxyalkylene chain (average molar substitution degree) can be determined from the difference as described above.
- This average molar substitution degree is an index indicating how many moles of oxyalkylene groups are introduced per vinyl alcohol unit.
- the average molar substitution degree is 0.3. It is necessary to be at least 0.5, preferably at least 0.5, more preferably at least 0.7, further preferably at least 1.0.
- the upper limit of the average molar substitution degree is not particularly limited, but is preferably at most 20 or less. If the average molar substitution degree is too small, the ionic conductive salt will not be dissolved, the ion mobility will be low, and the ionic conductivity will be low. On the other hand, if the concentration is higher than a certain level, the solubility and mobility of the ionic conductive salt will not change.
- the polymer compound having a polyvinyl alcohol unit having an oxyalkylene chain according to the present invention may be changed from a syrupy liquid having a high viscosity at room temperature (20 ° C.) to a rubbery solid, depending on the average degree of polymerization.
- the polymer compound of the present invention is not a linear polymer but an amorphous (amorphous) polymer formed by entanglement of highly branched molecular chains, regardless of the average degree of polymerization. This is confirmed by the fact that, as shown in FIG. 2, no peak suggesting the presence of crystals was observed from the result of wide-angle X-ray diffraction.
- the high molecular compound having a polyvinyl alcohol unit having an oxyalkylene chain according to the present invention has a hydroxyl group in the molecule (a residual hydroxyl group derived from the polyvinyl alcohol unit and a hydroxyl group derived from the introduced oxyalkylene-containing group).
- the blocking of the hydroxyl group of the polymer compound having a polyvinyl alcohol unit having an oxyalkylene chain by the above-mentioned substituent includes the following steps: (1) A polymer containing a high concentration of an ionic conductive salt, a polymer having a low dielectric constant; In the mixture, dissociation of the dissociated cation with the anion is apt to occur, causing a decrease in conductivity.However, if the polarity of the polymer matrix is increased, ion association is less likely to occur.
- a polymer compound having a polyvinyl alcohol unit having an oxyalkylene chain is reacted with a hydroxyl-reactive compound to thereby increase the hydroxyl group of the polymer compound. Is blocked with a highly polar substituent.
- Such a highly polar substituent is not particularly limited, but a neutral substituent is more preferable than an ionic substituent.
- a neutral substituent is more preferable than an ionic substituent.
- an unsubstituted or substituted monocyclic group having 1 to 10 carbon atoms is preferable.
- hydrophobic 2 polymer compound in the case of imparting flame retardancy, a hydroxyl group a halogen atom in the above-mentioned polymer compounds, R ig S i - group (R 1 is as defined above), with a re-emission atom Block with a group.
- halogen atom examples include fluorine, bromine, chlorine and the like, and unsubstituted or substituted monovalent having 1 to 10 (preferably 1 to 8) carbon atoms.
- hydrocarbon group those similar to the above can be exemplified.
- R 1 is the same as R 4 .
- R ⁇ Si— group examples include those in which R 1 is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 10 (preferably 1 to 6) carbon atoms, as described above. 1 is an alkyl group, preferably a trialkylsilyl group, among which a trimethylsilyl group is preferred.
- the substituent may be an amino group, an alkylamino group, a group having a phosphorus atom, or the like.
- the terminal blocking ratio by the substituent is preferably at least 10 mol%, more preferably at least 50 mol%, further preferably at least 90 mol%, and substantially all of the terminals Can be blocked with the above substituent (blocking ratio: about 100 mol%).
- all terminal hydroxyl groups of the polymer molecular chain are halogen atoms, R 1
- Blocking with a Si— group or a group having a phosphorus atom may reduce the ionic conductive salt dissolving ability of the polymer itself. Therefore, it is necessary to introduce an appropriate amount of a substituent while considering the degree of solubility. There is. Specifically, it is 10 to 95 mol%, preferably 50 to 95 mol%, and more preferably 50 to 90 mol%, based on all terminals (hydroxyl groups).
- a cyano group-substituted monovalent hydrocarbon group is particularly preferred. Specifically, a cyanoethyl group, a cyanobenzyl group, a cyanobenzoyl group, or a substituent in which a cyano group is bonded to another alkyl group is preferred. And the like.
- a monovalent hydrocarbon group substituted with a cyano group such as a cyanoethyl group with a RigS group such as a trimethylsilyl group. 7 0-9 7 mol% of the total end edge of a hydrocarbon radical chains (hydroxyl groups), preferably 9 0-9 7 mol%, R 1 3 S i - 3 0 ⁇ 3 of total end groups (hydroxyl) Mol%, preferably 10 to 3 mol%.
- Polymer derivative has been introduced in this manner by combining the Shiano substituted monovalent hydrocarbon group and R 1 3 S i Ichiki are those having both excellent conductivity and hydrophobic.
- a cyanoethyl group for example, an oxyalkylene chain
- a polymer compound having a polyvinyl alcohol unit having the following formula is mixed with dioxane and acrylonitrile, and a sodium hydroxide solution is added to the mixed solution, and the mixture is reacted with stirring.
- a cyanoethylated polymer derivative having a cyanoethyl group introduced into a part or all of the side chain can be obtained.
- a polymer compound having a polyvinyl alcohol unit having an oxyalkylene chain is mixed with acetic acid and methylene chloride, and an aqueous solution of perchloric acid and acetic anhydride are added to the mixed solution. , Room The mixture is allowed to stir at a warm temperature, the reaction solution is poured into cold water, and the precipitate is collected. The precipitate is dissolved in acetone and poured into water again. Neutralize with sodium bicarbonate and filter. The precipitate is collected, put into a dialysis tube together with water, dialyzed against ion-exchanged water, collected, washed with water, and dried under reduced pressure to obtain an acetylated polymer derivative.
- the precipitate is dissolved in N, N-dimethylsulfoxide, placed in a dialysis tube, dialyzed, the precipitate is collected, washed with water, and dried under reduced pressure to obtain a cyanobenzoylated polymer derivative.
- a polymer compound having a polyvinyl alcohol unit having an oxyalkylene chain is dissolved in dimethylacetamide, and bis (trimethylsilyl) acetamide is added to this solution.
- the precipitated precipitate is separated by filtration, the filtrate is dissolved in acetate, filtered through filter paper, and the solution is dried under reduced pressure to obtain a trimethylsilylated polymer derivative.
- a polymer compound having a polyvinyl alcohol unit having an oxyalkylene chain of the component (A) of the present invention obtained by the above method or a polymer derivative in which a part or all of the hydroxyl groups in the molecule are blocked.
- ionic conductivity is imparted by adding the ionic conductive salt of the component (B).
- the ion-conductive salt component (B), so long as it is used for usual electrochemical devices can be used without particular limitation, if example embodiment L i C l ⁇ 4, L i BFL i A s F L i PF 6 , L i S b F 6 , L i CF 3 S ⁇ 3 , L i CF 3 COO, N a C l ⁇ 4 , N a BF 4 , N a SCN, KBF 4 , M g (C 1 0 4) 2 , M g (BF 4) 2, (C 4 H 9) 4 NBF 4, (C 2 H 5) 4 NBF 4, (C 4 H 9) 4 NC 1 O 4, L i N (CF 3 SO 2 ) 2 , Et 4 NPF 6 (E t is an ethyl group) and the like.
- One of these can be used alone, or two or more can be used in combination.
- the amount of the ion-conductive salt of component (B) varies depending on the type of the ion-conductive salt used, the molecular weight of the polymer for the polymer electrolyte, the type of the substituent to be blocked, and the like. Usually, 5 to 1000 parts by weight, preferably 10 to 500 parts by weight, more preferably 10 to 100 parts by weight of the ion conductive salt is added to 100 parts by weight of the polymer for a polymer electrolyte. The amount is more preferably 10 to 50 parts by weight. If the amount of the ionic conductive salt is too small, the concentration of the ionic conductor becomes too low, and the result may be that the conductivity is too low for practical use. On the other hand, if the amount is too large, the solubility of the polymer matrix in the ionic conductive salt may be exceeded, and salts may be precipitated out.
- composition for an ion-conductive solid polymer of the present invention is usually formed into a thin film.
- a compound having a crosslinkable functional group is added as a component (C) in view of physical strength such as shape retention, and this compound is reacted.
- a compound having a crosslinkable functional group of the component (C) is added to a mixture of the polymer compound of the component (A) (polymer for a polymer electrolyte) and the ion conductive salt of the component (B), The compound is reacted to form a three-dimensional network structure, in which the component (A) is highly branched.
- a strong semi-interpenetrating polymer network (semi-interpenetrating Polyme rNetwork (semi-IPN)) structure in which the polymer for polyelectrolyte is entangled.
- the component (C) is added, and the component (A) is entangled with the component (A).
- the adhesive strength and the shape retention ability are improved, and the solid polymer electrolyte and the binder are suitable as a polymer.
- the compound having a crosslinkable functional group of the component (C) includes: (1) a compound having an epoxy group in the molecule and a compound having two or more active hydrogen groups capable of reacting with the epoxy group; In addition, a compound having an isocyanate group, a compound having two or more active hydrogen groups capable of reacting with the isocyanate group, and a compound having two or more reactive double bonds in the molecule can be used.
- Compounds having an epoxy group in the molecule include, for example, sorbitol-polyglycidyl ether, sorbitan glycidyl ether, polyglycerol-polyglycidyl ether, penyu erythritol polyglycidyl ether, diglyceric ether Polyglycidyl ether, triglycidyl tris (2-hydroxyhydricyl) isocyanurate, glycerol polyglycidyl ether, trimethylpropane polyglycidyl ether, resorcin diglycidyl ether, 1,6-hexa Diglycidyl ether, ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, diglycidyl ether of ethylene 'propylene glycol copolymer, polytetramethylene glycol Korujiguri ether, compounds having 2 or more epoxy groups in the molecule, such as adip
- phenolic compound can be reacted to form a semi-IPN structure.
- high molecular polyols such as polyethylene glycol, polypropylene glycol, ethylene glycol and propylene glycol copolymers, ethylene glycol, 1,2—propylene glycol, 1,3— Propylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 2,2-dimethyl-1,3-propanediol, diethylene glycol, Dipropylene glycol, 1,4-cyclohexanedimethanol, 1,4-bis (/ 3 hydroxyethoxy) benzene, p-xylylene diol, phenyljetanolamine, methyljetanolamine, polyethylene And other polyfunctional amines and polyfunctional
- Compounds having an isocyanate group in the molecule include, for example, tolylene diisocyanate, xylylene diisocyanate, naphthylene diisocyanate, diphenylmethane diisocyanate, biphenylene diisocyanate, diphenylene diisocyanate, diphene diisocyanate.
- Compounds having two or more isocyanate groups in a molecule such as luterdiisocyanate, trizine diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate, may be mentioned.
- an isocyanate-terminated polyol compound obtained by reacting the above-mentioned isocyanate compound with a polyhydric polyol compound can also be used. These can be obtained by reacting an isocyanate compound such as diphenylmethanediisocyanate tolylenediisocyanate with the following polyol compounds.
- the stoichiometric ratio of [NCO] of the isocyanate compound and [ ⁇ H] of the polyol compound is [NC ⁇ ]> [OH].
- [NCO]: [OH] l 0 3 1 ⁇ : in the range of L 0 Z 1, preferably 1.10 :! In the range of ⁇ 5/1.
- Polyol compounds include, for example, polyethylene glycol, High-molecular-weight polyols such as propylene glycol, ethylene glycol and propylene glycol copolymers, ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,3-butanediol, 1 1,4-butanediol, 1,5-pentanedyldiol, 1,6-hexanediol, 2,2-dimethyl-1,3-propanediol, diethylene glycol, dipropylene glycol, 1,4-silicone Chlohexanedimethanol, 1,4-bis (3-hydroxyethoxy) benzene, ⁇ -xylylenediol, phenyljetanolamine, methylgenolamine, 3,9bis (2-hydroxy1) , 1-dimethyl) 1,2,4,8,10-tetraoxaspiro [5,5] -opendecane.
- an amine compound having two or more active hydrogen groups may be reacted with the isocyanate compound.
- a compound having a primary or secondary amino group can be used, but a compound having a primary amino group is more preferable.
- Examples thereof include amino alcohols such as amino, and among these, more preferred are diamines having the same functional group reactivity.
- the Isoshiane preparative compounds also [NCO], in ⁇ Mi emission compound [Nyuita 2], the stoichiometric ratio of [NH] a [NCO]> [NH 2] + [NH].
- a semi-IPN structure cannot be formed only with these compounds having an isocyanate group.
- these compounds are reacted with a compound having two or more active hydrogen groups, for example, an amine compound, an alcohol compound, a carboxylic acid compound, and a phenol compound, to form a semi- An IPN structure can be formed.
- a compound having two or more active hydrogen groups for example, an amine compound, an alcohol compound, a carboxylic acid compound, and a phenol compound.
- examples thereof include polyethylene glycol, polypropylene glycol, ethylene glycol and propylene glycol copolymer.
- Polymer polyols such as ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 2,2-dimethyl-1,3-propanediol, diethylene glycol, dipropylene glycol, 1,4-cyclohexandimethanol, 1,4-bis (/ 3 (Droxyethoxy) Benzene, p-xylylene diol, phenylethanolamine, methyldiethanolamine, polyethyleneimine, other polyfunctional amines, polyfunctional carboxylic acids and the like.
- Compounds having a reactive double bond include divinyl benzene, divinyl sulfone, aryl methacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, and dimethacrylic acid.
- acrylic acid or methacrylic acid ester such as glycidyl methacrylate, glycidyl acrylate, tetrahydrofurfuryl methacrylate, methacryloyl isocyanate, 2 —Hydroxymethyl methacrylic acid, N, N—Dimethylaminoethyl methacrylic acid and other compounds having one acrylic acid group or methacrylic acid group in the molecule can be added.
- N-methylol acrylamide, methylene bis acrylamide, diacetone acrylamide and other acrylamide compounds, vinyloxazoles, vinylene carbonate and other vinyl compounds, and other reactive double bonds. can be added.
- Particularly preferred reactive monomers among the compounds containing a reactive double bond include diester compounds containing a polyoxyalkylene component represented by the following formula (3). And a monoester compound containing a polyoxyalkylene component It is recommended to use in combination R
- R 4 , R 5 , and R 6 are each a hydrogen atom, or a methyl group, an ethyl group, an n_propyl group, an i-propyl group, an n-butyl group, an i-butyl group, an s-butyl group, t — represents an alkyl group having 1 to 6 carbon atoms, especially 1 to 4 carbon atoms, such as a butyl group.
- R 4 , R 5 and R 6 are preferably a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, an s-butyl group, and a t-butyl group.
- R 7 , R 8 , and R 9 are a hydrogen atom, or a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, an s-butyl group, t Alkyl group having 1 to 6, especially 1 to 4 carbon atoms, such as monobutyl group, which satisfies the condition of A ⁇ l and B ⁇ 0, or satisfies the condition of A ⁇ 0 and B ⁇ l A + B is preferably 100 or less, particularly preferably 1 to 30.
- R 7 , R 8 , and R 9 represent a methyl group, an ethyl group, an n-propyl group, and an i-propyl Groups, n-butyl groups, i-butyl groups, s-butyl groups, and t-butyl groups are preferred.
- the diester compound containing a polyoxyalkylene component and the monoester compound containing a polyoxyalkylene component can be used in a mixture of a polymer derivative and an ionic conductive salt in the form of ultraviolet light, electron beam, X-ray, ⁇ -ray, By irradiating waves, high frequency, etc. or heating the mixture By doing so, a three-dimensional cross-linked network structure with a semi-IPN structure is formed.
- a diester compound containing a polyoxyalkylene component can be used alone to be added to the polymer for the polymer electrolyte of the component (A) and then polymerized to form a semi-one IPN structure.
- a monoester compound containing a polyoxyalkylene component which is a monofunctional monomer
- the diester compound containing the polyoxyalkylene component it is preferable to further add a monoester compound containing a polyoxyalkylene component, which is a monofunctional monomer, to the diester compound containing the polyoxyalkylene component. This is because a polyoxyalkylene branched chain is introduced onto a three-dimensional network by the addition of the monoester compound.
- composition ratio of the diester compound containing the polyoxyalkylene component and the monoester compound containing the polyoxyalkylene component is not particularly limited.
- Monoester compound containing alkylene component] 1 to 0.5, particularly preferably 1 to 0.2 from the viewpoint of improving the film strength.
- the compounding amount of the compound having a crosslinkable functional group of the component (C) is 10 to 50 parts by weight of the compound having a crosslinkable functional group with respect to 100 parts by weight of the polymer compound of the component (A). 0 parts by weight, preferably 10 to 150 parts by weight, more preferably 20 to 100 parts by weight.
- the amount of the compound having a crosslinkable functional group is less than 10 parts by weight, the film strength may not be increased.
- the amount exceeds 500 parts by weight the ion-conductive metal salt dissolving ability of the entire matrix is reduced, which may cause inconveniences such as salt precipitation and brittleness of the formed film.
- a solvent capable of dissolving the ion-conductive salt is added to the composition for an ion-conductive solid polymer of the present invention in an ordinary amount. can do.
- solvents include dibutyl ether, 1,2-dimethoxetane, 1,2-ethoxymethoxetane, methyldiglyme, methyltriglyme, methyltetraglyme, ethylglyme, ethylglyme, butylglyme.
- Chain ethers such as glycol ethers (Ethyl cellosolve, ethyl carbitol, butyl cellosolve, butyl carbitol, etc.)
- the compound having a crosslinkable functional group of the component (C) is reacted or polymerized by irradiation or by heating, and the resulting three-dimensional network structure has a polyoxyalkylene branched chain. It can form a three-dimensional cross-linked network (semi_IPN) structure that is entangled with the molecular chain of a polymer compound having a vinyl alcohol unit.
- the above polymerization reaction is mainly a radical reaction, Structure can be formed.
- a polymerization initiator catalyst
- a polymerization initiator is usually added.
- the polymerization initiator is not particularly limited, and is acetophenone, trichloroacetophenone, 2-hydroxy-12-methylpropiophenone, 2-hydroxy-12-methylisopropiopheno.
- Photoinitiators such as 1,1-hydroxycyclohexyl ketone, benzoin ether, 2,2-getoxyacetophenone and benzyldimethyl ketone can be used.
- thermal polymerization initiator examples include high-temperature initiators such as cumene hydroperoxide, tert-butyl hydroperoxide, dicumyl peroxide, and di-tert-butyl peroxide, benzoyl peroxide, lauroyl peroxide, and the like.
- Ordinary initiators such as persulfate and azobisisobutyronitrile, hydrogen peroxide, ferrous salt, persulfate, sodium acid sulfite, cumene dropoperoxide, ferrous salt, peroxide
- Low-temperature initiators such as benzoyl oxide and dimethylaniline, peroxides, organometallic alkyls, triethyl boron, getyl zinc, oxygen, and organometallic alkyls can be used.
- the amount of the radical reaction catalyst added depends on the amount of the compound (C) having a crosslinkable functional group of component 10 described above. It is in the range of 0.1 to 1 part by weight, preferably 0.1 to 0.5 part by weight, based on 0 part by weight. If the amount of the catalyst is less than 0.1 part by weight, the polymerization rate may be significantly reduced. On the other hand, if it exceeds 1 part by weight, the reactivity is not affected and the reagent is simply wasted.
- Conditions of the polymerization reaction is not particularly limited, for example, reaction conditions in the case of photopolymerization, at room temperature, ultraviolet irradiation 5-3 0 minutes or more light amount of l ⁇ 5 0 mW / cm 2 in air Do it.
- the polymer formed by the polymerization forms a strong semi-IPN three-dimensional network structure by entanglement with the polymer chains of the polymer compound having a polypinyl alcohol unit having an oxyalkylene branched chain. No crystalline structure is formed, and the matrix is amorphous (amorphous).
- the polymerization reaction is preferably performed by ultraviolet irradiation or heat polymerization in view of simplicity of the apparatus and running cost.
- composition for an ionic conductive solid polymer and the ionic conductive solid polymer electrolyte of the present invention are a method based on the standard of the peeling adhesive strength test method of an adhesive in accordance with JISK 6854 (1994).
- Adhesive strength as measured by (1) is preferably at least 0.2 lkN / m, more preferably at least 0.2 kNZm, and even more preferably at least 0.4 kNZm.
- the ion-conductive solid polymer electrolyte of the present invention has a strong semi-one IPN structure in which a polymer compound having a polyvinyl alcohol unit having an oxyalkylene branched chain highly branched into a three-dimensional network structure is entangled. Despite the dramatic improvement in shape retention capability, the molecular structure is amorphous polymer and is not crystallized, so the ionic conductor can move smoothly within the molecule, and the — 3 to 10— 4 SZ cm High conductivity, high adhesive strength and adhesiveness, and no risk of evaporation and liquid leakage. Solid for various batteries including lithium ion secondary batteries. It is suitable as a polymer electrolyte.
- the ionic conductive solid polymer electrolyte of the present invention is obtained, for example, by coating a mixed solution obtained by mixing the components (A) to (C) and a diluting solvent on a support, and then adding the component (C).
- a film is formed by a cross-linking reaction, and a uniform coating is further obtained by means of mouth coating such as a roll of applicator, screen coating, doctor blade method, spin coating, bar coating, etc. It can be formed into a thick electrolyte membrane.
- This ionic conductive solid polymer electrolyte has high ionic conductivity and high adhesiveness, and in addition to its role as a solid electrolyte, is disposed between the positive electrode and the negative electrode, and functions to firmly bond the positive and negative electrodes. It is suitable as a solid electrolyte for various types of secondary batteries such as film batteries.
- the binder resin of the present invention mainly comprises a polymer compound having a polyvinyl alcohol unit having an oxyalkylene chain as the component (A) and a compound having a crosslinkable functional group as the component (C). Ingredients. in this case
- the binder resin may be substantially composed of the component (A) and may not include the component (C).
- the compounding amount of the compound having a crosslinkable functional group of the component (C) is 10 to 500 parts by weight, preferably 10 to 1 part by weight, based on 100 parts by weight of the polymer compound of the component (A). 50 parts by weight, more preferably 20 to 100 parts by weight.
- the binder resin of the present invention preferably has an adhesive strength of 0.1 lk NZm when measured by a method based on the standard of the peeling adhesive strength test method of an adhesive in accordance with JISK 6854 (1994). As described above, more preferably, it exhibits a high adhesive force of 0.2 kNZm or more, more preferably 0.4 kN / m or more.
- the secondary battery of the present invention comprises a positive electrode, a negative electrode, and a solid polymer electrolyte layer, and uses the ion-conductive solid polymer electrolyte of the present invention as the solid polymer electrolyte layer. And a negative electrode.
- a composite positive electrode in which a positive electrode solution prepared by mixing the binder resin of the present invention and the positive electrode active material is applied on a positive electrode current collector is used as the positive electrode, and a negative electrode made of lithium foil or
- the composition for an ion-conductive polymer electrolyte of the present invention is interposed between a negative electrode solution prepared by mixing the binder resin of the present invention and a negative electrode active material, and a composite negative electrode coated on a negative electrode current collector.
- a solid polymer electrolyte layer made of Note that the bin It is also possible to adopt a configuration in which the base resin substantially comprises the component (A) and does not contain the component (C).
- the positive electrode active material is appropriately selected according to the use of the electrode, the type of the battery, and the like.
- a chalcogen compound or a lithium ion-containing chalcogen compound capable of adsorbing and desorbing lithium ions is used as a positive electrode active material.
- the adsorption removable chalcogen compound of the above lithium ion for example F e S 2, T i S 2, M o S 2, V 2 0 5, V 6 0 1 3, M N_ ⁇ 2, and the like.
- lithium ion-containing chalcogen compounds such as L i C o 0 2, L i M N_ ⁇ 2, L i M n 2 ⁇ 4, L i M o 2 0 4, L i V 3 O 8, L i N i ⁇ 2 , L ix N i yM i— y 0 2 (where M is at least one selected from Co, M n, T i, C r, V, A l, S n, P b, and Z n Represents one or more types of metal elements, such as 0.55 ⁇ x ⁇ l.10, 0.5 ⁇ y ⁇ 1.0).
- positive electrode active materials can be used as a composite positive electrode to which an ion-conductive solid polymer electrolyte, a binder (binder), a conductive agent, and the like are added.
- the ionic conductive solid polymer electrolyte and the binder resin of the present invention may be used as the ionic conductive solid polymer electrolyte and the binder.
- the conductive agent include acetylene black and natural graphite.
- the method for thinning the composite positive electrode is not particularly limited.
- roller coating such as a roll of applicator, screen coating, doc evening blade method, spin coating, barco evening, etc. It is desirable that the film is formed to have a uniform thickness by using the above means.
- the negative electrode active material is appropriately selected depending on the use of the electrode, the type of battery, and the like.
- an alkali metal or an alkali alloy is used.
- a carbon material, the same material as the above-described positive electrode active material, or the like can be used.
- examples of the alkali metal include Li, Na, and K.
- examples of the alkali metal alloy include, for example, metals Li, Li—Al, Li—Mg, and Li—Al. — Ni, Na, Na-Hg, Na—Zn and the like.
- the carbon material examples include graphite, carbon black, coke, glassy carbon, carbon fiber, and a sintered body thereof. These negative electrode active materials can be used alone. Usually, however, it is preferably used as a composite negative electrode to which an ion-conductive solid polymer electrolyte, a binder, a conductive agent and the like are added. In this case, it is preferable to use the ion-conductive solid polymer electrolyte and the binder resin of the present invention as the ion-conductive solid polymer electrolyte and the binder.
- the conductive agent include acetylene black and natural graphite.
- the method for thinning the composite negative electrode is not particularly limited, and examples thereof include roller coating such as apparel roll, screen coating, Doc Yu-Blade method, spin coating, and Bar Co-Ou ichi.
- roller coating such as apparel roll, screen coating, Doc Yu-Blade method, spin coating, and Bar Co-Ou ichi.
- a uniform thickness can be obtained by using a means.
- the binder resin of the present invention is used as a binder for the positive electrode, the negative electrode, and the ionic conductive solid polymer electrolyte layer constituting the secondary battery of the present invention.
- the powdered positive and negative electrode active materials can be firmly bonded, and the interface resistance between the electrode and the solid electrolyte can be reduced because the binder resin and the solid polymer electrolyte have the same composition.
- a film battery having high ion conductivity and excellent performance in which an electrode and a solid electrolyte are firmly adhered to each other, in particular, various secondary batteries such as a lithium secondary battery and a lithium ion secondary battery can be obtained. .
- CH 2 0- calculated molar substitution from the weight of the product obtained with P VA weight of the feed result is as follows.
- Dihydroxypropylated polyvinyl alcohol was prepared in the same manner as in Synthesis Example 1 except that glycidol was used in an amount of 134 parts by weight.
- the yield was 33.04 parts by weight, and the average degree of molar substitution (MS) of the introduced dihydroxypropyl unit calculated from the yield was 1.37.
- MS from NMR was 1.49.
- a solution of 67 parts by weight of glycidol in 100 parts by weight of dimethyl sulfoxide was gradually added to the solution over 3 hours, and the mixture was stirred at 50 ° C. for 8 hours to react. After completion of the reaction, a homogeneous solution was obtained.
- the solution was diluted with water, neutralized with acetic acid, purified by dialysis, and the solution was freeze-dried to obtain dihydroxypropylated polyvinyl alcohol.
- the yield was 30.01 parts by weight, and the average degree of molar substitution (MS) of the introduced dihydroxypropyl unit calculated from the yield was 1.19.
- Hydroxypropylated polyvinyl alcohol was obtained in the same manner as in Synthesis Example 3 except that 53 parts by weight of propylene oxide was used instead of glycidol.
- the yield was 24.63 parts by weight, and the average molar substitution (MS) of the introduced hydroxypropyl units calculated from the yield was 1. It was 1 1 MS can be calculated from the following equation.
- An aqueous solution in which 1.8 parts by weight of tritium was dissolved in 2.5 parts by weight of water was gradually added, and the mixture was stirred at room temperature for 1 hour.
- phenol (EO) 5 glycidyl ether (Denacol EX-1445, manufactured by Nagase Kasei Kogyo Co., Ltd.) was gradually added, and the mixture was stirred and reacted at 50 ° C. for 8 hours.
- the structural formula of the reaction product is shown below.
- the average molar substitution degree (MS) of the ethylene oxide unit determined by NMR was 2.6.
- the solution was diluted with water, neutralized with acetic acid, purified by dialysis, and the solution was freeze-dried to obtain dihydroxypropylated polyvinyl alcohol.
- the yield was 23.45 parts by weight, and the average degree of molar substitution (MS) of the introduced dihydroxypropyl unit calculated from the yield was 0.8.
- the solution was diluted with water, neutralized with acetic acid, purified by dialysis, and the purified solution was freeze-dried to obtain dihydroxypropylated polyethylene vinyl alcohol.
- the yield was 25.0 parts by weight, and the average degree of molar substitution (MS) of the introduced dihydroxypropylunitite calculated from the yield was 0.8. MS can be calculated from the following equation.
- the polymers of Synthesis Examples 2 to 7 were cyanoethylated in exactly the same manner as in Synthesis Example 8 to prepare cyanoethylated polymer derivatives of Synthesis Examples 9 to 14.
- absorption of hydroxyl groups in the infrared absorption spectrum was not confirmed, and it was confirmed that the hydroxyl groups were completely blocked by cyanoethyl groups (blocking rate: 100%). did it.
- the obtained composition was sandwiched between two copper plates having a gap of 200 m and then heated at 100 ° C for 1 hour using an incubator to cure. 1 to 7 ionic conductive solid polymer electrolytes (membrane) were obtained.
- the conductivity and adhesive strength of the obtained solid polymer electrolyte were measured by the following methods.
- wide-angle X-ray measurement was performed to confirm the crystallinity, and the state at room temperature was visually observed (S: soft paste solid, L: high viscosity) Liquid).
- S soft paste solid
- L high viscosity Liquid
- the solid polymer electrolyte was left at 100 ° C. for 5 hours, and the weight loss due to evaporation was measured. Table 2 shows the results.
- the cured solid polymer electrolyte was sandwiched between two copper plates having a gap of 200 m, and the measurement was performed by an AC impedance method.
- the evaluation was made based on the standard of the test method for the peel adhesion strength of the adhesive of JISK 6854. Specifically, a composition for an ion-conductive polymer electrolyte was applied to a copper plate 0.6 mm thick, 25.5 ⁇ 0.2 mm wide, and 300 mm long, which had been surface-treated with abrasive paper. The cured product was used as a T-peel test specimen. Both ends of the test piece were attached to a gripper of a tester capable of being fixed, and the measurement was performed. The moving speed of the crosshead was 100 ⁇ 0.2 mmZmin, and the movement was continued until the remaining portion of the bonded portion became about 10 mm. The measurement results were processed by the optimal linear method, and the peel adhesion strength was determined from the obtained peel load according to: Is S8401
- Example 8 to 10 Production of composition for ion-conductive solid polymer and ion-conductive solid polymer electrolyte (2) Polymer derivatives of synthesis examples 8, 11, 14 and perchloric acid Lithium was dissolved in tetrahydrofuran. The solution was left under reduced pressure to evaporate tetrahydrofuran. Next, a predetermined amount of a polyurethane-based crosslinking agent was added. As this polyurethane-based crosslinking agent, a mixture of a polyol solution and an isocyanate solution was used.
- composition was sandwiched between two copper plates having a gap of 200 m, heated at 100 ° C. for 1 hour using a thermostat, and cured to form Examples 8 to 10
- An ionic conductive solid polymer electrolyte (membrane) was obtained.
- the conductivity and adhesive strength of the obtained composite were measured in the same manner as described above.
- the state at room temperature was visually judged (S: soft base solid, 'L: high viscosity liquid), and the crystallinity was confirmed by wide-angle X-ray measurement. Further, the obtained composite was allowed to stand at 100 ° C. for 5 hours, and a weight reduction ratio due to evaporation was measured. Table 4 shows the results.
- a hydroxypropylcellulose / lithium perchlorate composite (composition for ion-conductive solid polymer) was prepared in the same manner as in Examples 1 to 7, except that hydroxypropylcellulose was used as the polymer.
- the conductivity and adhesive strength of the obtained composite were measured in the same manner as described above.
- the state at room temperature was visually judged (S: soft base solid, L: high viscosity liquid), and the crystallinity was confirmed by wide-angle X-ray measurement. Further, the obtained composite was allowed to stand at 100 ° C. for 5 hours, and a weight reduction ratio due to evaporation was measured. Table 4 shows the results.
- a cyanoethylated hydroxypropylcellulose ′ lithium perchlorate complex (composition for ionic conductive solid polymer) was prepared in the same manner as in Examples 1 to 7, except that cyanoethylated hydroxypropylcellulose was used as the polymer. Created.
- Crosslinking agent 1 Polyethylene glycol dichloride
- Crosslinking agent 2 Methoxypolyethylene glycol monomethacrylate Room temperature s: Soft paste solid
- Crosslinking agent 3 Ethylene oxide / polyethylene oxide copolymer Polymer polyol
- Crosslinking agent 4 Polyisocyanate
- Crosslinking agent 1 Polyethylene glycol dimethacrylate
- Crosslinking agent 2 Methoxypolyethylene glycol monomethacrylate Room temperature
- composition for an ionic conductive solid polymer and the ionic conductive solid polymer electrolyte of the present invention have high ionic conductivity, high adhesiveness, and excellent shape retention properties. It is the best binder polymer.
- the positive electrode, L i C O_ ⁇ 2 and Ketjen Black 9 as Seikyokudo one flop liquid 0: 1 0 weight ratio in the mixed powder by Sunda first resin (I solution): powder 1: 1 0 , And an appropriate amount of N-methyl-pyrrolidone was added as a diluting solvent to obtain a positive electrode dope solution.
- This positive electrode dope solution was cast on a positive electrode current collector made of aluminum foil using a knife, and then left at 80 for 1 hour to obtain a semi-solid. A sheet-like composite positive electrode in a state was prepared.
- a lithium foil was used for the negative electrode, and the lithium foil was pressed on a stainless steel current collector.
- composition (solution II) for the ion-conductive polymer electrolyte of Example 1 was slightly overlaid on the surface of the negative electrode lithium foil, and a sheet-like composite positive electrode was placed on the negative electrode while facing the negative electrode. Then, pressure was applied by overlapping the composite positive electrode surface and the negative electrode lithium foil surface so that the gap was 25 zm. In this state, the entire electrode was left at about 80 ⁇ for 6 hours to be cured.
- a conductive solid polymer electrolyte film battery was obtained.
- the obtained film battery had a configuration of [aluminum foil composite positive electrode 1I liquid cured lithium metal foil stainless steel current collector], was chargeable and dischargeable, and was confirmed to function effectively as a lithium secondary battery. .
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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KR1020007013190A KR20010025102A (ko) | 1999-03-23 | 2000-03-22 | 이온도전성 고체고분자용 조성물, 이온도전성 고체고분자전해질, 바인더수지 및 2차전지 |
CA002333277A CA2333277A1 (en) | 1999-03-23 | 2000-03-22 | Ion-conductive solid polymer-forming composition and ion-conductive solid polymer electrolyte, binder resin and secondary cell |
EP00911270A EP1090956A1 (en) | 1999-03-23 | 2000-03-22 | Composition for ionically conductive solid polymer, ionically conductive solid polyelectrolyte, binder resin, and secondary battery |
US09/700,912 US6537468B1 (en) | 1999-03-23 | 2000-03-22 | Composition for ionically conductive solid polymer, ionically conductive solid polyelectrolyte, binder resin, and secondary battery |
Applications Claiming Priority (2)
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JP11/78087 | 1999-03-23 | ||
JP7808799 | 1999-03-23 |
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WO2000056815A1 true WO2000056815A1 (fr) | 2000-09-28 |
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PCT/JP2000/001734 WO2000056815A1 (fr) | 1999-03-23 | 2000-03-22 | Composition pour polymere solide a conductivite ionique, polyelectrolyte solide a conductivite ionique, resine de liaison et batterie secondaire |
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US (1) | US6537468B1 (ja) |
EP (1) | EP1090956A1 (ja) |
KR (1) | KR20010025102A (ja) |
CN (2) | CN1249156C (ja) |
CA (1) | CA2333277A1 (ja) |
WO (1) | WO2000056815A1 (ja) |
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JP2006307012A (ja) * | 2005-04-28 | 2006-11-09 | Yamaguchi Univ | 高分子固体電解質 |
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- 2000-03-22 KR KR1020007013190A patent/KR20010025102A/ko active IP Right Grant
- 2000-03-22 EP EP00911270A patent/EP1090956A1/en not_active Withdrawn
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Cited By (14)
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JP2003017129A (ja) * | 2001-05-03 | 2003-01-17 | Samsung Sdi Co Ltd | 高分子電解質、その製造方法及びこれを採用したリチウム電池 |
JPWO2002093679A1 (ja) * | 2001-05-10 | 2004-09-02 | 日清紡績株式会社 | 非水電解質溶液、高分子ゲル電解質用組成物、および高分子ゲル電解質、ならびに二次電池および電気二重層キャパシタ |
JP2006307012A (ja) * | 2005-04-28 | 2006-11-09 | Yamaguchi Univ | 高分子固体電解質 |
JP2011506629A (ja) * | 2007-12-06 | 2011-03-03 | ビーエーエスエフ ソシエタス・ヨーロピア | 室温で架橋可能なイオン伝導性重合体系 |
US9065150B2 (en) | 2009-12-09 | 2015-06-23 | Nippon Shokubai Co., Ltd. | Electrolyte material, and battery material and secondary battery using said electrolyte material |
WO2011071101A1 (ja) * | 2009-12-09 | 2011-06-16 | 株式会社日本触媒 | 電解質材料並びにそれを用いた電池用材料及び二次電池 |
JP2014139909A (ja) * | 2012-02-14 | 2014-07-31 | Mitsubishi Chemicals Corp | 非水系二次電池負極用活物質、それを用いた負極及び非水系二次電池 |
JP2018526799A (ja) * | 2015-11-23 | 2018-09-13 | エルジー・ケム・リミテッド | 接着力が改善されたリチウム二次電池用電極およびその製造方法 |
US10811687B2 (en) | 2015-11-23 | 2020-10-20 | Lg Chem, Ltd. | Electrode with improved adhesion property for lithium secondary battery, and manufacturing method thereof |
JP2019525445A (ja) * | 2017-03-09 | 2019-09-05 | 深▲セン▼市貝特瑞新能源材料股▲ふん▼有限公司 | リチウムイオン二次電池用水性粘着剤、およびその調製方法とリチウムイオン二次電池極板 |
JPWO2019181660A1 (ja) * | 2018-03-23 | 2021-03-25 | 日本ゼオン株式会社 | 非水系二次電池電極用バインダー組成物、非水系二次電池電極用導電材ペースト組成物、非水系二次電池電極用スラリー組成物、非水系二次電池用電極および非水系二次電池 |
WO2020066917A1 (ja) * | 2018-09-28 | 2020-04-02 | 積水化学工業株式会社 | 二次電池電極用組成物 |
JPWO2020066917A1 (ja) * | 2018-09-28 | 2021-08-30 | 積水化学工業株式会社 | 二次電池電極用組成物 |
JP7497158B2 (ja) | 2018-09-28 | 2024-06-10 | 積水化学工業株式会社 | 二次電池電極用組成物 |
Also Published As
Publication number | Publication date |
---|---|
CA2333277A1 (en) | 2000-09-28 |
US6537468B1 (en) | 2003-03-25 |
EP1090956A1 (en) | 2001-04-11 |
KR20010025102A (ko) | 2001-03-26 |
CN1482171A (zh) | 2004-03-17 |
CN1304429A (zh) | 2001-07-18 |
CN1249156C (zh) | 2006-04-05 |
CN1121446C (zh) | 2003-09-17 |
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