WO2004049475A1 - 非水電解液電池の電極用バインダー組成物およびそれを用いた電極合剤、電極並びに電池 - Google Patents
非水電解液電池の電極用バインダー組成物およびそれを用いた電極合剤、電極並びに電池 Download PDFInfo
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- WO2004049475A1 WO2004049475A1 PCT/JP2003/014903 JP0314903W WO2004049475A1 WO 2004049475 A1 WO2004049475 A1 WO 2004049475A1 JP 0314903 W JP0314903 W JP 0314903W WO 2004049475 A1 WO2004049475 A1 WO 2004049475A1
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- WO
- WIPO (PCT)
- Prior art keywords
- electrode
- polymer
- battery
- negative electrode
- vinylidene fluoride
- Prior art date
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 50
- 239000011230 binding agent Substances 0.000 title claims abstract description 33
- 239000011255 nonaqueous electrolyte Substances 0.000 title claims abstract description 20
- 229920000642 polymer Polymers 0.000 claims abstract description 47
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 claims abstract description 44
- 125000000524 functional group Chemical group 0.000 claims abstract description 31
- 229920006112 polar polymer Polymers 0.000 claims abstract description 14
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 10
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 claims abstract description 4
- 239000007772 electrode material Substances 0.000 claims description 10
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 7
- 229920001577 copolymer Polymers 0.000 claims description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 6
- 229910052744 lithium Inorganic materials 0.000 claims description 6
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 5
- 239000005977 Ethylene Substances 0.000 claims description 5
- 229920002125 Sokalan® Polymers 0.000 claims description 5
- 239000003575 carbonaceous material Substances 0.000 claims description 4
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 claims description 4
- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims 1
- 241001654684 Pinda Species 0.000 claims 1
- 239000011737 fluorine Substances 0.000 claims 1
- 239000007788 liquid Substances 0.000 claims 1
- 239000011149 active material Substances 0.000 abstract description 11
- 239000000178 monomer Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 11
- 238000009782 nail-penetration test Methods 0.000 description 10
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 9
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 9
- 229910001416 lithium ion Inorganic materials 0.000 description 9
- 238000002360 preparation method Methods 0.000 description 9
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 6
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 description 5
- 239000004715 ethylene vinyl alcohol Substances 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- -1 more specifically Polymers 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 238000010557 suspension polymerization reaction Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- NKHAVTQWNUWKEO-UHFFFAOYSA-N fumaric acid monomethyl ester Natural products COC(=O)C=CC(O)=O NKHAVTQWNUWKEO-UHFFFAOYSA-N 0.000 description 3
- 229920000609 methyl cellulose Polymers 0.000 description 3
- NKHAVTQWNUWKEO-IHWYPQMZSA-N methyl hydrogen fumarate Chemical compound COC(=O)\C=C/C(O)=O NKHAVTQWNUWKEO-IHWYPQMZSA-N 0.000 description 3
- 239000001923 methylcellulose Substances 0.000 description 3
- 239000007773 negative electrode material Substances 0.000 description 3
- 239000004584 polyacrylic acid Substances 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 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 3
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000011883 electrode binding agent Substances 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical group FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 150000002642 lithium compounds Chemical class 0.000 description 2
- 229910021382 natural graphite Inorganic materials 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- LVGUZGTVOIAKKC-UHFFFAOYSA-N 1,1,1,2-tetrafluoroethane Chemical compound FCC(F)(F)F LVGUZGTVOIAKKC-UHFFFAOYSA-N 0.000 description 1
- FCBJLBCGHCTPAQ-UHFFFAOYSA-N 1-fluorobutane Chemical compound CCCCF FCBJLBCGHCTPAQ-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XLYMOEINVGRTEX-ARJAWSKDSA-N Ethyl hydrogen fumarate Chemical compound CCOC(=O)\C=C/C(O)=O XLYMOEINVGRTEX-ARJAWSKDSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920003174 cellulose-based polymer Polymers 0.000 description 1
- 229910052798 chalcogen Inorganic materials 0.000 description 1
- 150000001787 chalcogens Chemical class 0.000 description 1
- HNEGQIOMVPPMNR-IHWYPQMZSA-N citraconic acid Chemical compound OC(=O)C(/C)=C\C(O)=O HNEGQIOMVPPMNR-IHWYPQMZSA-N 0.000 description 1
- 229940018557 citraconic acid Drugs 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000002482 conductive additive Substances 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 229920006037 cross link polymer Polymers 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- GYZLOYUZLJXAJU-UHFFFAOYSA-N diglycidyl ether Chemical compound C1OC1COCC1CO1 GYZLOYUZLJXAJU-UHFFFAOYSA-N 0.000 description 1
- CGBYBGVMDAPUIH-ARJAWSKDSA-N dimethylmaleic acid Chemical compound OC(=O)C(/C)=C(/C)C(O)=O CGBYBGVMDAPUIH-ARJAWSKDSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000007606 doctor blade method Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- XLYMOEINVGRTEX-UHFFFAOYSA-N fumaric acid monoethyl ester Natural products CCOC(=O)C=CC(O)=O XLYMOEINVGRTEX-UHFFFAOYSA-N 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- GNOIPBMMFNIUFM-UHFFFAOYSA-N hexamethylphosphoric triamide Chemical compound CN(C)P(=O)(N(C)C)N(C)C GNOIPBMMFNIUFM-UHFFFAOYSA-N 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 230000010220 ion permeability Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- 229910003455 mixed metal oxide Inorganic materials 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 239000003495 polar organic solvent Substances 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-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
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 150000003377 silicon compounds Chemical class 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- DQWPFSLDHJDLRL-UHFFFAOYSA-N triethyl phosphate Chemical compound CCOP(=O)(OCC)OCC DQWPFSLDHJDLRL-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Classifications
-
- 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
- H01M4/623—Binders being polymers fluorinated polymers
-
- 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
-
- 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
-
- 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
- Non-aqueous electrolyte battery electrode binder composition and electrode mixture using the same are non-aqueous electrolyte battery electrode binder composition and electrode mixture using the same,
- the present invention relates to an electrode binder used in the production of a nonaqueous electrolyte battery, particularly a lithium ion battery, an electrode mixture using the same, an electrode, and a nonaqueous electrolyte battery using the same.
- Non-aqueous rechargeable batteries using lithium as batteries that can obtain more energy with a small volume and weight are used as power sources for small electronic devices mainly used in homes such as mobile phones, personal computers, and video camcorders. Has been used.
- the electrode structure for a lithium-ion battery is used in a state where an active material and a conductive agent are held on a current collector by a binder.
- a lithium composite oxide is used as a positive electrode active material
- a carbon-based material is used as a negative electrode active material
- a carbon-based material is used as a negative electrode active material.
- a vinylidene fluoride polymer is mainly used as a binder for binding the active materials.
- Japanese Patent Application Laid-Open No. 11-329443 exemplifies a mixture of a vinylidene fluoride-based polymer and a cellulose-based polymer having no functional group. It was not considered at all.
- the main problem of the present invention is to maintain the required high capacity of a non-aqueous electrolyte battery while improving its performance stability and safety in the event of an internal short circuit.
- An object of the present invention is to provide a binder composition for an electrode, and an electrode and a non-aqueous electrolyte battery using the same.
- a positive electrode and / or a negative electrode of a nonaqueous electrolyte battery including a positive electrode capable of inserting and extracting lithium and a negative electrode.
- a binder composition used as a binder of the above comprising at least a functional group-containing vinylidene fluoride polymer and a polar polymer having a hydroxyl group and / or a carbonyl group in the molecule. It is intended to provide a binder composition for a non-aqueous electrolyte battery electrode characterized by the following.
- the present invention provides an electrode mixture containing the binder composition and an electrode active material, an electrode having a layer of the electrode mixture on a current collector, and at least one of a positive electrode and a negative electrode.
- the present invention provides a non-aqueous electrolyte battery including:
- the carboxyl group ⁇ glycidyl group in the vinylidene fluoride polymer and the hydroxyl group and carbonyl group of the polar polymer form a hydrogen bond with the hydroxyl group on the surface of the current collector and the surface of the electrode active material, and the adhesiveness as a binder
- a lithium ion selective permeable film is formed on the surface of the electrode active material to block the permeation of the non-aqueous electrolyte, and is synthesized by the reaction between the electrolyte and lithium ions during charging and discharging on the surface of the electrode active material.
- Examples of the functional group-containing vinylidene fluoride-based polymer of the present invention include vinylidene fluoride monomer alone or other monomers copolymerizable with a vinylidene fluoride monomer, for example, carbonization of ethylene or propylene.
- Copolymers are preferably used.
- Monomers having a functional group include those having a carboxyl group and those having a glycidyl group.
- carboxyl group-containing monomer examples include unsaturated monobasic acids such as acrylic acid and crotonic acid, unsaturated dibasic acids such as maleic acid and citraconic acid, and monomethyl maleate which is a monoalkyl ester thereof. Esters, monoethyl maleate, monomethyl citraconic acid, monoethyl citraconic ester and the like.
- the glycidyl group-containing monomer examples include acrylidicidyl ether, methacrylic glycidyl ether, glycidinole crotonate, and dalicidyl acetyl acetate.
- a functional group-containing vinylidene fluoride polymer obtained by copolymerizing at least one or more of these is preferably used.
- These functional group-containing vinylidene fluoride polymers can be obtained by known methods such as suspension polymerization, emulsion polymerization, and solution polymerization.
- a vinylidene fluoride-based polymer may be dehydrofluorinated with a heated base or the like, and then treated with an organic acid or an oxidizing agent to obtain a polymer containing a functional group.
- the molecular weight of a functional group-containing vinylidene fluoride polymer is determined by measuring the intrinsic viscosity (4 g of resin in 1 liter of N, N —The logarithmic viscosity at 30 ° C. of a solution dissolved in dimethylformamide) is 0.8 to 20 dl / g, preferably 1.0 to 20 dl Zg, and more preferably 1.0 to 1 dl / g. 5 dl / g, more preferably 1.2 to 15 dl Zg is suitably used. If the intrinsic viscosity of the vinylidene fluoride polymer is less than the above range, the viscosity of the electrode mixture becomes low and coating becomes difficult, and if it exceeds the above range, dissolution in an organic solvent becomes difficult and Absent.
- the polar polymer used in the present invention includes a polymer having a hydroxyl group and a polymer having a carboxy group.
- the polymer having a hydroxyl group include an ethylene vinylinoleanol copolymer, a senorelose polymer, and a vinylol phenol polymer.
- the polymer having a carboxy group include a polyacrylic acid-based polymer, more specifically, polyacrylic acid, a polyacrylic acid cross-linked polymer, and metal salts thereof.
- the polar polymer include polybutylpyrrolidone Is also preferably used.
- a polar polymer having a hydroxyl group or a hydroxyl group, a homopolymer of vinylidene fluoride, vinylidene fluoride and fusidani vinyl a copolymer of vinylidene fluoride and a monomer copolymerizable with vinylidene fluoride such as trifluoroethylene, chlorofluoroethylene, tetrafluoroethylene, and hexafluoropropylene can be added.
- the mixing ratio between the functional group-containing vinylidene fluoride copolymer and the polar polymer is 10 to 99% by weight, preferably, the functional group-containing vinylidene fluoride copolymer. 20-95 weight. / 0 , the polar polymer is 1 to 90% by weight, preferably 5 to 80% by weight. If the mixing ratio of the polar polymer is less than the above range, the state of coating on the surface of the active material is insufficient and the contact area between the surface of the active material and the electrolytic solution is increased, resulting in poor battery safety. Further, the adhesiveness between the polymer electrode and the current collector and the binding property between the electrode active materials are reduced, and there is a concern that the discharge capacity during repeated charge and discharge is reduced.
- the mixing ratio of the polar polymer is larger than the above range, the film formed on the electrode surface becomes too thick, the lithium ion permeability at the interface between the active material and the electrolyte is inferior, and the internal resistance increases. There is a concern that the charge / discharge capacity may decrease.
- the binder composition of the present invention is usually prepared by dissolving a functional group-containing vinylidene fluoride polymer and a polar polymer constituting the binder composition in a solvent, and further dissolving the positive electrode or negative electrode active material and, if necessary, An auxiliary agent such as a conductive auxiliary agent to be added is dispersed to form a slurry-like electrode mixture, which is used for manufacturing an electrode.
- the solvent is preferably a polar organic solvent, such as N-methyl-2-pyrrolidone, N, N-dimethylformamide, N, N-dimethylacetamide, N, N-dimethylsulfoxide, Hexamethylphosphamide, triethyl phosphate, acetone and the like. These organic solvents can be used alone or in combination of two or more.
- the active material of the lithium ion secondary battery for other in the case of the positive electrode, the general formula L i MY 2 (M is C o, N i, F e , Mn, C r, transition metals V, etc. At least one of the following: Y is a chalcogen element such as 0 or S); in the case of a negative electrode, natural graphite, artificial graphite, coke, activated carbon, phenolic resin, pitch, etc.
- powdery carbonaceous material a metal oxide-based G e 0, G e 0 2 , SO, S n0 2, P b O, P b 0 2 or the like or a mixed metal oxide thereof, S i, S i S
- a key compound such as n and a silicon compound are used.
- the binder composition is used in an amount of 0.1 to 30 parts by weight, and especially 0 to 30 parts by weight, based on 100 parts by weight of the electrode (positive electrode or negative electrode) active material and the conductive additive (these are collectively referred to as “powder electrode material”). It is preferable to use 5 to 20 parts by weight.
- the solvent may be used alone or as a mixture of two or more, and the binder composition may be used in an amount of 0.1 to 30 parts by weight, particularly 100 parts by weight of the solvent. It is preferable to use it at a ratio of 1 to 20 parts by weight.
- a homogenizer As a device used for mixing the mixture comprising the binder composition, the powdered electrode material, and the organic solvent, a homogenizer, a multiaxial planetary dispersion / mixing / kneading machine or an emulsifier can be used, but is not limited thereto. It is not done.
- the mixture slurry prepared by the above method is uniformly dispersed and mixed with the powdered electrode material and the binder composition, and is applied to the current collector with good applicability.
- the coating method may be a known method, and among them, the doctor blade method is preferably used.
- the mixture on the current collector is solvent-dried at, for example, 50 to 170 ° C., and if necessary, subjected to a pressing step to form an electrode structure for a non-aqueous secondary battery or the like.
- the binder composition and the electrode mixture of the present invention are used for forming at least one of a positive electrode and a negative electrode, and if any one of them is preferably used for forming a negative electrode. This is because the powdered electrode material constituting the negative electrode requires a binder having higher adhesiveness, and the binder composition of the present invention is particularly suitable.
- the polymer slurry is dehydrated, washed with water, dehydrated, and then dried at 80 ° C for 20 hours.
- the functional group-containing hydrofluoric acid of the present invention having a yield of 89% and an inherent viscosity of 1.1 d 1 A vinylidene fluoride polymer A was obtained.
- the polymer slurry is dehydrated, washed with water, dehydrated, and dried at 80 ° C for 20 hours.
- a vinylidene fluoride polymer having a yield of 91% and an inherent viscosity of 1.1 d 1 / g is obtained.
- C polyvinylidene fluoride
- N-methyl-2-pyrrolidone was added to 94 parts by weight of lithium cobaltate ("Cellseed C-5", manufactured by Nippon Chemical Industry), 3 parts by weight of vinylidene fluoride polymer C, and 3 parts by weight of carbon black. 43 parts by weight were added and mixed to prepare a positive electrode mixture. The obtained mixture was uniformly applied on a 10 / m-thick aluminum foil so that the film thickness after drying was about 100 ⁇ , and dried at 130 ° C for 25 minutes. A positive electrode structure (active material amount: 29 1 g / m 2 ) was obtained.
- a negative electrode mixture composition A of the present invention was prepared by mixing 88 parts by weight of spherical natural graphite powder (produced in China) with an average particle diameter of 30 ⁇ m and 67 parts by weight of NMP. The resulting mixture was applied evenly on a copper foil with a thickness of 8 / zm to a thickness of about 100 / xm after drying, and dried at 130 ° C for 25 minutes. A negative electrode structure A (the amount of the active material: 163 g / m 2 ) was obtained.
- the negative electrode structure applied to the current collector and dried was used as a sample, and the peel strength of the electrode mixture layer from the current collector was measured by a 180 ° peel test in accordance with JIS K 6854.
- Battery A was charged to 4.2 V with a constant current of 0.2 mA, then discharged to 3.0 V with a constant current of 0.2 mA, and then 4.37 V with a constant current of 1 mA. Charged up to.
- the charge capacity (integral value of the charge current value) of the battery in the second charge was 133 mAh.
- the above charged battery A was allowed to stand on a wooden plate with the negative electrode facing up, and a nail with a diameter of 1 mm was stabbed and penetrated.
- the rise in battery surface temperature was measured using an infrared thermograph (“TVS-100” manufactured by Avionics).
- the maximum temperature rise of battery A after nail penetration was 3 ° C.
- Example 1 The procedure of Example 1 was repeated except that polyacrylic acid (PAA) (“AQUPEC HV—501”, manufactured by Sumitomo Seika) was used instead of EVOH in the fabrication of the negative electrode. Got B.
- PAA polyacrylic acid
- the peel strength of negative electrode structure B was 1. O g f Zmm Battery B had a charge capacity of 135 mAh, and the maximum temperature rise in the nail penetration test was 3.5 ° C.
- Example 1 The procedure of Example 1 was repeated except that the functional group-containing vinylidene fluoride polymer B was used in place of the functional group-containing vinylidene fluoride polymer A in the preparation of the negative electrode. Got C.
- the peel strength of negative electrode structure C was 4.3 gf / mm, the charge capacity of battery C was 13 OmAh, and the maximum temperature rise in the nail penetration test was 3 ° C.
- Example 4 The same procedure as in Example 1 was carried out, except that hydroxethyl cellulose (HEC) (“HEC Daicel EP850”, manufactured by Daicel Chemical Industries) was used instead of EVOH in the preparation of the negative electrode. Battery D was obtained.
- HEC hydroxethyl cellulose
- the peel strength of negative electrode structure D was 0.9 gf / mm, the charge capacity of battery D was 133 mAh, and the maximum temperature rise in the nail penetration test was 3 ° C.
- Example 1 The procedure of Example 1 was repeated, except that polyparabule fuenoren (PPVP) (“Markalinker I-S-2PJ”, Maruzen Petrochemical Co., Ltd.) was used instead of EVOH in the preparation of the negative electrode. Structure H and battery H were obtained.
- PPVP polyparabule fuenoren
- the peel strength of the negative electrode structure H was 5.4 g f Zmm, the charging capacity of the battery H was 134 mAh, and the maximum temperature rise in the nail penetration test was 4 ° C.
- Example 1 The procedure of Example 1 was repeated, except that the amount of the functional group-containing vinylidene fluoride polymer A was increased from 11 g to 12 g in the preparation of the negative electrode, and EV0H was not used. Battery E was obtained.
- the peel strength of the negative electrode structure E was 0.9 gf / mm, the charge capacity of the battery E was 133 mAh, and the maximum temperature rise in the nail penetration test was 12 ° C.
- Example 3 The same procedure as in Example 3 was carried out except that the amount of the functional group-containing vinylidene fluoride polymer B was increased from 11 g to 12 g in the preparation of the negative electrode, and EVOH was not used. Battery F was obtained.
- the peel strength of the negative electrode structure F was 3.1 g f / mm, the charge capacity of the battery F was 124 mAh, and the maximum temperature rise in the nail penetration test was 6.5 ° C.
- a negative electrode structure G and a battery G were obtained in the same manner as in Example 1, except that a vinylidene fluoride polymer C was used in place of the functional group-containing vinylidene fluoride polymer A in the preparation of the negative electrode.
- the peel strength of the negative electrode structure G was 0.1 ⁇ g f / mm, the charge capacity of the battery G was 134 mAh, and the maximum temperature rise in the nail penetration test was 6 ° C.
- a negative electrode structure G and a battery G were obtained in the same manner as in Comparative Example 1, except that the functional group-containing vinylidene fluoride polymer A was used in place of the functional group-containing vinylidene fluoride polymer A in the preparation of the negative electrode.
- Peel strength of negative electrode structure H is 0.7 f / mm Battery H has a charge capacity of 13 mAh The maximum temperature rise in the nail penetration test was 9 ° C.
- the binder for the positive electrode Z or the negative electrode was a functional group-containing vinylidene fluoride polymer.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
Description
Claims
Priority Applications (2)
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AU2003284631A AU2003284631A1 (en) | 2002-11-22 | 2003-11-21 | Binder composition for electrode of nonaqueous electrolyte battery, and electrode mixture, electrode and battery using same |
JP2004555003A JP4851092B2 (ja) | 2002-11-22 | 2003-11-21 | 非水電解液電池の電極用バインダー組成物およびその利用 |
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PCT/JP2003/014903 WO2004049475A1 (ja) | 2002-11-22 | 2003-11-21 | 非水電解液電池の電極用バインダー組成物およびそれを用いた電極合剤、電極並びに電池 |
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JP (1) | JP4851092B2 (ja) |
KR (1) | KR20050085095A (ja) |
CN (1) | CN100365853C (ja) |
AU (1) | AU2003284631A1 (ja) |
TW (1) | TW200410439A (ja) |
WO (1) | WO2004049475A1 (ja) |
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CN100365853C (zh) | 2008-01-30 |
JP4851092B2 (ja) | 2012-01-11 |
TWI330902B (ja) | 2010-09-21 |
CN1714465A (zh) | 2005-12-28 |
JPWO2004049475A1 (ja) | 2006-03-30 |
TW200410439A (en) | 2004-06-16 |
KR20050085095A (ko) | 2005-08-29 |
AU2003284631A1 (en) | 2004-06-18 |
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