WO2020196148A1 - 電極合剤用組成物、電極合剤、電極、非水電解質二次電池、および電極の製造方法 - Google Patents
電極合剤用組成物、電極合剤、電極、非水電解質二次電池、および電極の製造方法 Download PDFInfo
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- WO2020196148A1 WO2020196148A1 PCT/JP2020/011957 JP2020011957W WO2020196148A1 WO 2020196148 A1 WO2020196148 A1 WO 2020196148A1 JP 2020011957 W JP2020011957 W JP 2020011957W WO 2020196148 A1 WO2020196148 A1 WO 2020196148A1
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- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-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
- 239000005977 Ethylene Substances 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
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- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 1
- 229910017069 Ni0.6Co0.2Mn0.2O Inorganic materials 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- ZZAGLMPBQOKGGT-UHFFFAOYSA-N [4-[4-(4-prop-2-enoyloxybutoxy)benzoyl]oxyphenyl] 4-(4-prop-2-enoyloxybutoxy)benzoate Chemical compound C1=CC(OCCCCOC(=O)C=C)=CC=C1C(=O)OC(C=C1)=CC=C1OC(=O)C1=CC=C(OCCCCOC(=O)C=C)C=C1 ZZAGLMPBQOKGGT-UHFFFAOYSA-N 0.000 description 1
- FZENGILVLUJGJX-UHFFFAOYSA-N acetaldehyde oxime Chemical compound CC=NO FZENGILVLUJGJX-UHFFFAOYSA-N 0.000 description 1
- 229960001413 acetanilide Drugs 0.000 description 1
- PXAJQJMDEXJWFB-UHFFFAOYSA-N acetone oxime Chemical compound CC(C)=NO PXAJQJMDEXJWFB-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- HIFVAOIJYDXIJG-UHFFFAOYSA-N benzylbenzene;isocyanic acid Chemical class N=C=O.N=C=O.C=1C=CC=CC=1CC1=CC=CC=C1 HIFVAOIJYDXIJG-UHFFFAOYSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000002041 carbon nanotube Substances 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
- 239000000470 constituent Substances 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 229930003836 cresol Natural products 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229940043279 diisopropylamine Drugs 0.000 description 1
- 239000003085 diluting agent Substances 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
- WEHWNAOGRSTTBQ-UHFFFAOYSA-N dipropylamine Chemical compound CCCNCCC WEHWNAOGRSTTBQ-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- WNAHIZMDSQCWRP-UHFFFAOYSA-N dodecane-1-thiol Chemical compound CCCCCCCCCCCCS WNAHIZMDSQCWRP-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000011883 electrode binding agent Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- YAMHXTCMCPHKLN-UHFFFAOYSA-N imidazolidin-2-one Chemical compound O=C1NCCN1 YAMHXTCMCPHKLN-UHFFFAOYSA-N 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical group OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 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
- 239000007769 metal material Substances 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- AYLRODJJLADBOB-QMMMGPOBSA-N methyl (2s)-2,6-diisocyanatohexanoate Chemical compound COC(=O)[C@@H](N=C=O)CCCCN=C=O AYLRODJJLADBOB-QMMMGPOBSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229940074369 monoethyl fumarate Drugs 0.000 description 1
- YWWHKOHZGJFMIE-UHFFFAOYSA-N monoethyl phthalate Chemical compound CCOC(=O)C1=CC=CC=C1C(O)=O YWWHKOHZGJFMIE-UHFFFAOYSA-N 0.000 description 1
- NKHAVTQWNUWKEO-NSCUHMNNSA-N monomethyl fumarate Chemical compound COC(=O)\C=C\C(O)=O NKHAVTQWNUWKEO-NSCUHMNNSA-N 0.000 description 1
- 229940005650 monomethyl fumarate Drugs 0.000 description 1
- WHIVNJATOVLWBW-UHFFFAOYSA-N n-butan-2-ylidenehydroxylamine Chemical compound CCC(C)=NO WHIVNJATOVLWBW-UHFFFAOYSA-N 0.000 description 1
- RIVIDPPYRINTTH-UHFFFAOYSA-N n-ethylpropan-2-amine Chemical compound CCNC(C)C RIVIDPPYRINTTH-UHFFFAOYSA-N 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 150000002923 oximes Chemical class 0.000 description 1
- 229920001447 polyvinyl benzene Polymers 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-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
- 239000003381 stabilizer Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 229960002317 succinimide Drugs 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- DQWPFSLDHJDLRL-UHFFFAOYSA-N triethyl phosphate Chemical compound CCOP(=O)(OCC)OCC DQWPFSLDHJDLRL-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/29—Compounds containing one or more carbon-to-nitrogen double bonds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08L27/16—Homopolymers or copolymers or vinylidene fluoride
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C09D127/16—Homopolymers or copolymers of vinylidene fluoride
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
-
- 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
- H01M4/04—Processes of manufacture in general
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1397—Processes of manufacture of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a composition for an electrode mixture, an electrode mixture, and its use. More specifically, the present invention relates to a composition for an electrode mixture, an electrode mixture, an electrode, a non-aqueous electrolyte secondary battery, and a method for producing an electrode.
- non-aqueous electrolyte secondary batteries are also used in hybrid vehicles that combine secondary batteries and engines, and electric vehicles that use secondary batteries as a power source, from the viewpoint of global environmental issues and energy saving. Applications are expanding.
- the electrode for the non-aqueous electrolyte secondary battery has a structure having a current collector and an electrode mixture layer formed on the current collector.
- the electrode mixture layer is generally a current collector in a slurry state in which an electrode mixture containing an electrode active material, a conductive auxiliary agent, and an electrode mixture composition (binder composition) is dispersed in a suitable solvent or dispersion medium. It is applied onto and formed by volatilizing a solvent or dispersion medium.
- a vinylidene fluoride polymer composition such as polyvinylidene fluoride (PVDF) is mainly used because it has excellent chemical resistance, weather resistance, and excellent electrochemical stability.
- Patent Document 1 describes an electrode binder for a lithium ion secondary battery containing a vinylidene fluoride polymer dispersed in an organic diluent and a (meth) acrylic polymer dispersant.
- the vinylidene fluoride polymer may have low adhesive strength with the metal foil, which is the current collector of the battery, the active material, etc., and it is required to increase the adhesive strength.
- Lithium cobalt oxide has been mainly used as the positive electrode active material (electrode active material), but in recent years, lithium nickel composite oxide, lithium iron phosphate and the like are also known as positive electrode active materials depending on the application.
- the positive electrode active material if a vinylidene fluoride polymer is used as the binder composition, the electrode mixture tends to thicken during storage. In some cases, it may gel, and it is required to improve the stability of the electrode mixture.
- vinylidene fluoride polymer As a method for improving the adhesiveness of the vinylidene fluoride polymer to a metal foil or the like, it is obtained by copolymerizing vinylidene fluoride with a monoester of an unsaturated dibasic acid such as maleic acid monomethyl ester.
- Vinylidene fluoride-based copolymer see, for example, Patent Documents 2 and 3
- vinylidene fluoride-based copolymer obtained by copolymerizing vinylidene fluoride and an acrylic acid-based compound see, for example, Patent Document 4). Is disclosed.
- Patent Documents 2 to 4 do not yet have sufficient adhesiveness to metal foils and the like.
- Patent Document 5 when a vinylidene fluoride-based polymer and a positive electrode mixture are used to prepare an electrode mixture, a high nickel-based polymer having a high nickel content as the positive electrode active material is used.
- an electrode mixture is prepared using a positive electrode active material, there is a problem that gelation is suppressed but adhesiveness is lowered.
- the present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a binder composition having better adhesiveness to a metal foil or the like than the conventional vinylidene fluoride polymer.
- the present inventor unexpectedly uses an electrode mixture containing a vinylidene fluoride polymer and a polyisocyanate compound to obtain a current collector and an electrode.
- the present invention has been made based on the finding that the adhesive strength with the mixture layer can be increased.
- the composition for an electrode mixture according to one aspect of the present invention is a synthetic resin containing a vinylidene fluoride polymer in a proportion of 99% by mass or more, and a poly in which at least a part of isocyanate groups are blocked by a blocking agent.
- a composition for an electrode mixture containing an isocyanate compound is a synthetic resin containing a vinylidene fluoride polymer in a proportion of 99% by mass or more, and a poly in which at least a part of isocyanate groups are blocked by a blocking agent.
- a composition for an electrode mixture capable of increasing the adhesive strength between the current collector and the electrode mixture layer in a battery such as a lithium ion secondary battery.
- composition for electrode mixture contains a synthetic resin and a polyisocyanate compound.
- the synthetic resin may contain the vinylidene fluoride polymer in a proportion of 99% by mass or more, and in one embodiment, it contains only the vinylidene fluoride polymer.
- the synthetic resin contains another polymer, there is no particular limitation as long as the desired effect of the composition for electrode mixture of the present embodiment is not impaired.
- One aspect of the synthetic resin may be a synthetic resin that does not contain a (meth) acrylic polymer as another polymer.
- the vinylidene fluoride polymer in a proportion of 99% by mass or more, the adhesive strength between the current collector and the electrode mixture layer when the composition for electrode mixture according to this embodiment is used can be enhanced. .. Further, it is preferable to contain the vinylidene fluoride polymer in a proportion of 99% by mass or more from the viewpoint of electrochemical stability.
- vinylene fluoride polymer refers to a homopolymer of vinylidene fluoride, a monomer copolymerizable with vinylidene fluoride, and a copolymer of vinylidene fluoride. It contains any of (polymers).
- a known monomer can be appropriately selected.
- the vinylidene fluoride unit is preferably contained in an amount of 50 mol% or more, the vinylidene fluoride unit is more preferably contained in an amount of 80 mol% or more, and the vinylidene fluoride unit is contained in an amount of 90 mol% or more. It is particularly preferable to contain the above.
- vinylidene fluoride polymer is a copolymer
- vinylidene fluoride is the main constituent, and it is derived from a structural unit derived from unsaturated dibasic acid, a structural unit derived from unsaturated dibasic acid monoester, and an alkyl vinyl halide compound.
- the structural unit derived from the compound represented by the following formula (1) the structural unit derived from the compound represented by the following formula (2), and the compound represented by the following formula (3). It is preferably a vinylidene fluoride copolymer containing at least one structural unit.
- Examples of the unsaturated dibasic acid according to the present embodiment include fumaric acid, maleic acid, citraconic acid and phthalic acid.
- Examples of the unsaturated dibasic acid monoester according to the present embodiment include monomethyl fumarate, monoethyl fumarate, monomethyl maleate, monoethyl maleate, monomethyl citraconic acid, monoethyl citraconic acid, monomethyl phthalate and monoethyl phthalate. Be done.
- R 1 , R 2 and R 3 are independently hydrogen atoms, fluorine atoms, chlorine atoms or carbon atoms 1 to 5, respectively. It is an alkyl group of.
- alkyl group having 1 to 5 carbon atoms examples include a methyl group, an ethyl group, a propyl group and an isopropyl group.
- R 1 is preferably a hydrogen atom or a methyl group, and more preferably a hydrogen atom.
- R 2 is preferably a hydrogen atom or a methyl group, and more preferably a hydrogen atom.
- R 3 is preferably a hydrogen atom, a fluorine atom, or a methyl group, and more preferably a hydrogen atom.
- the main chain constituting X' has an atomic number of 1 to 19, preferably an atomic number of 1 to 14, and more preferably an atomic number of 1 to 9.
- the atoms constituting such a main chain include carbon atoms and heteroatoms.
- the hetero atom is preferably an oxygen atom.
- the number of atoms in the main chain does not include the number of hydrogen atoms.
- the molecular weight of the atomic group of X' may be 472 or less, but preferably 172 or less.
- the lower limit of the molecular weight in the case of an atomic group is not particularly limited, but is usually about 14.
- Specific examples of the compound represented by the formula (1) according to the present embodiment include acryloyloxypropyl succinic acid, acryloyloxyethyl succinic acid, methacrylooxyethyl succinic acid, and methacryloyloxypropyl succinic acid.
- Examples thereof include acids, 2-carboxyethyl acrylate, 2-carboxyethyl methacrylate, acryloyloxyethyl phthalic acid, methacrylooxyethyl phthalic acid, N-carboxyethyl (meth) acrylamide, and carboxyethyl thio (meth) acrylate.
- acryloyloxypropyl succinic acid and acryloyloxyethyl succinic acid are preferable.
- R 1 , R 2 and R 3 are independently hydrogen atoms, fluorine atoms, chlorine atoms or carbon atoms 1 to 1. It is an alkyl group of 5.
- a preferred embodiment is the same as R 1 , R 2 , and R 3 in the formula (1).
- the main chain constituting X'' may have 1 to 19 atoms, preferably 1 to 14 atoms, more preferably 1 to 9 atoms, and even more preferably. Has 2 to 6 atoms.
- the atoms constituting the main chain include carbon atoms and heteroatoms. When a hetero atom is included, the hetero atom is preferably an oxygen atom.
- the number of atoms in the main chain does not include the number of hydrogen atoms.
- the molecular weight of the atomic group of X'' may be 484 or less, preferably 184 or less, and more preferably 156 or less.
- the lower limit of the molecular weight in the case of an atomic group is not particularly limited, but is usually about 14.
- the X'' is preferably an atomic group having a main chain composed of 2 to 6 atoms and having a molecular weight of 156 or less.
- Specific examples of the compound represented by the formula (2) according to the present embodiment include vinyl carboxymethyl ether and vinyl carboxyethyl ether.
- R 1 , R 2 and R 3 are independently hydrogen atoms, fluorine atoms, chlorine atoms or carbon atoms 1 to 1. It is an alkyl group of 5.
- a preferred embodiment is the same as R 1 , R 2 , and R 3 in the formula (1).
- X''' is a hydrogen atom or a hydrocarbon moiety having 1 to 5 carbon atoms containing at least one hydroxyl group.
- hydrocarbon moiety having 1 to 5 carbon atoms containing a hydroxyl group include a hydroxyethyl group and a hydroxypropyl group.
- Specific examples of the compound represented by the formula (3) include acrylic acid, methacrylic acid, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate 2-hydroxyethyl methyl acrylate, 2-hydroxypropyl methacrylate and the like. Can be mentioned. Of these, 2-hydroxyethyl acrylate and acrylic acid are preferable.
- Examples of the other monomer include a halogenated alkyl vinyl compound copolymerizable with vinylidene fluoride, a fluorine-based monomer, a hydrocarbon-based monomer such as ethylene and propylene, and a dimethacrylic acid (poly) alkylene glycol.
- Examples thereof include esters, diacrylic acid (poly) alkylene glycol esters, and polyvinylbenzene.
- halogenated alkyl vinyl compound examples include a fluoroalkyl vinyl compound, and specific examples thereof include hexafluoropropylene (HFP), chlorotrifluoroethylene (CTFE), trifluoroethylene (TFE), and tetrafluoroethylene.
- HFP hexafluoropropylene
- CFE chlorotrifluoroethylene
- TFE trifluoroethylene
- Hexafluoroethylene, fluoroalkyl vinyl ether and the like, and among them, hexafluoropropylene and chlorotrifluoroethylene are preferable.
- the other monomer may be used alone or in combination of two or more.
- vinylidene fluoride polymer As the vinylidene fluoride polymer, a commercially available one can be used. For example, KF # 7300, KF # 9100, KF # 9700, KF # 7500, etc. manufactured by Kureha Corporation can be mentioned.
- the intrinsic viscosity of the vinylidene fluoride polymer used in the present embodiment is not particularly limited, but is preferably 0.5 to 5.0 dl / g, and is 1.0 dl / g or more and 4.5 dl / g or less. More preferably, it is more preferably 1.5 dl / g or more and 4.0 dl / g or less.
- the intrinsic viscosity ( ⁇ i ) is the viscosity of a solution of vinylidene fluoride polymer (A) dissolved in n-methylpyrrolidone (NMP) at 30 ° C. ( ⁇ ), the viscosity of NMP at 30 ° C. ( ⁇ 0 ), and the like. And from the concentration (C) of the vinylidene fluoride polymer (A) in the above solution, it can be obtained by the following formula.
- the polymerization method of the vinylidene fluoride polymer is not particularly limited, and a conventionally known polymerization method can be used.
- the polymerization method include suspension polymerization, emulsion polymerization, solution polymerization and the like. Among them, aqueous suspension polymerization and emulsion polymerization are preferable from the viewpoint of ease of post-treatment, and aqueous suspension polymerization is particularly preferable. preferable.
- polyisocyanate compound In the polyisocyanate compound contained in the composition for electrode mixture of the present embodiment, at least a part of the isocyanate groups are blocked by the blocking agent. That is, the polyisocyanate compound has at least one blocked isocyanate group.
- blocked isocyanate group refers to an isocyanate group that is blocked (stabilized) with a blocking agent.
- the blocking agent When the blocked isocyanate group is heated, the blocking agent is dissociated (deblocked) and the isocyanate group is regenerated. From the viewpoint of improving the adhesive strength between the current collector and the electrode mixture layer, it is preferable that 60% or more of the isocyanate groups are blocked by the blocking agent, and 80% or more of the isocyanate groups are blocked by the blocking agent. It is more preferable that all the isocyanate groups of the polyisocyanate compound are blocked with a blocking agent.
- the polyisocyanate compound contained in the composition for an electrode mixture of the present embodiment is a multimer of at least one diisocyanate selected from the group consisting of aliphatic diisocyanates, alicyclic diisocyanates and aromatic diisocyanates, and is at least one.
- the isocyanate group in the part is blocked (stabilized) with a blocking agent.
- aliphatic diisocyanate compound examples include butane diisocyanate, pentane diisocyanate, hexamethylene diisocyanate (HDI), trimethylhexamethylene diisocyanate, and lysine diisocyanate.
- alicyclic diisocyanate compound examples include isophorone diisocyanate (IPDI), hydrogenated xylylene diisocyanate, hydrogenated diphenylmethane diisocyanate and 1,4-cyclohexane diisocyanate.
- IPDI isophorone diisocyanate
- hydrogenated xylylene diisocyanate hydrogenated diphenylmethane diisocyanate
- 1,4-cyclohexane diisocyanate 1,4-cyclohexane diisocyanate.
- aromatic diisocyanates examples include xylylene diisocyanate (XDI), diphenylmethane diisocyanate (MDI) and tolylene diisocyanate (TDI).
- diisocyanates may be used alone or in combination of two or more.
- aliphatic diisocyanates and alicyclic diisocyanates are preferable, hexamethylene diisocyanates and isophorone diisocyanates are preferable, and hexamethylene diisocyanates are more preferable from the viewpoint of weather resistance and industrial availability.
- polyisocyanate derived from diisocyanate at least one selected from the group consisting of isocyanurate bond, bullet bond, urethane bond, uretdione bond, urea bond, alohanate bond, oxadiazine trione bond and iminooxadiazine dione bond.
- Polyisocyanate having the bond of From the viewpoint of weather resistance and heat resistance, a polyisocyanate having an isocyanurate bond, a burette bond, a urethane bond or an alohanate bond is preferable. It may also include two or more of these bonds.
- the number of isocyanate groups (including blocked isocyanate groups) in the polyisocyanate is preferably 2 to 22, more preferably 3 to 18.
- the polyisocyanate may be used alone or in combination of two or more.
- blocking agents include oxime compounds, active methylene compounds, pyrazole compounds, alcohol compounds, alkylphenol compounds, phenol compounds, mercaptan compounds, acid amide compounds, acid imide compounds, imidazole compounds, urea compounds and amine compounds.
- oxime compound examples include formaldehyde, acetoaldoxime, acetoxime, methylethylketooxime (MEK oxime), methylisobutylketooxime (MIBK oxime), dimethylketooxime, diethylketooxime, cyclohexanone oxime and the like.
- Examples of the active methylene compound include dimethyl malonate, diethyl malonate, ethyl isobutanoyl acetate, methyl acetoacetate, ethyl acetoacetate, acetylacetone and the like.
- pyrazole compounds include 3,5-dimethylpyrazole, pyrazole, 3-methylpyrazole and the like.
- alcohol compounds include methanol, ethanol, 2-propanol, n-butanol, sec-butanol, 2-ethyl-1-hexanol, 2-methoxyethanol, 2-ethoxyethanol, 2-butoxyethanol and the like.
- alkylphenol compounds include monoalkylphenols and dialkylphenols having an alkyl group having 4 or more carbon atoms as a substituent.
- phenolic compounds include phenol, cresol, ethylphenol, styrenated phenol, hydroxybenzoic acid ester and the like.
- Examples of the mercaptan compound include butyl mercaptan and dodecyl mercaptan.
- acid amide compounds include acetanilide, acetate amide, ⁇ -caprolactam, ⁇ -valerolactam and ⁇ -butyrolactam.
- acid imide compounds examples include succinimide and maleate imide.
- imidazole compounds examples include imidazole and 2-methylimidazole.
- urea compounds include urea, thiourea, ethylene urea and the like.
- amine compounds include diphenylamine, aniline, carbazole, di-n-propylamine, diisopropylamine, isopropylethylamine and the like.
- the isocyanate group of the polyisocyanate compound may be blocked by one kind of blocking agent or may be blocked by two or more kinds of blocking agents.
- Polyisocyanate in which the isocyanate group is blocked by the blocking agent dissociates the blocking agent (deblocking) by heating, and the isocyanate group is regenerated.
- the blocking agent is preferably dissociated at the heating temperature of a heat-drying step in which the electrode mixture is applied to the current collector foil and then dried, or a heat treatment step in which heat treatment is performed thereafter.
- the blocking agent is preferably an oxime compound, an active methylene compound, and a pyrazole compound.
- methyl ethyl ketooxime, dimethyl malonate, diethyl malonate, methyl acetoacetate, ethyl acetoacetate, 3,5-dimethylpyrazole and pyrazole are preferred.
- an oxime compound is used as the blocking agent, the adhesive strength between the current collector and the electrode mixture layer can be increased, and the thickening of the electrode mixture can be suppressed.
- the polyisocyanate compound in which at least a part of the isocyanate groups are blocked by the blocking agent a commercially available compound can be used.
- Duranate TPA-B80E oxime derivative blocked polyisocyanate of 1,6-hexamethylene diisocyanate
- SBN-70D pyrazole derivative blocked isocyanate of 1,6-hexamethylene diisocyanate
- MF-K60B 1,6-hexamethylene diisocyanate
- Active methylene derivative block isocyanate of diisocyanate both manufactured by Asahi Kasei Chemicals Co., Ltd.
- the content of the polyisocyanate compound with respect to 100 parts by mass of the synthetic resin in the composition for electrode mixture of the present embodiment is preferably 0.5 to 50 parts by mass, and more preferably 2 to 40 parts by mass. ..
- the adhesive strength between the current collector and the electrode mixture layer can be increased.
- the intrinsic viscosity of the synthetic resin is preferably high within the preferable viscosity range of the synthetic resin.
- the form of the composition for the electrode mixture of the present embodiment is not particularly limited, and may be powdery or liquid. Further, the composition for the electrode mixture may contain a solvent.
- the solvent may be a non-aqueous solvent or water.
- the non-aqueous solvent include N-methylpyrrolidone, N, N-dimethylformamide, N, N-dimethylacetamide, dimethyl sulfoxide, hexamethylphosphoamide, dioxane, tetrahydrofuran, tetramethylurea, triethylphosphate, and trimethylphos.
- Examples thereof include fate, acetone, ethyl acetate, n-butyl acetate, nbutanol, dipropylene glycol monomethyl ether, propylene glycol monomethyl ether acetate and cyclohexanone. Two or more kinds of these solvents may be mixed and used.
- the electrode mixture of the present embodiment contains the above-mentioned composition for electrode mixture and an active material.
- the electrode mixture may contain a conductive auxiliary agent, a non-aqueous solvent, a pigment dispersant, a dispersion stabilizer, and the like.
- the electrode mixture can be an electrode mixture for the positive electrode or an electrode mixture for the negative electrode by changing the type of the active material or the like according to the type of the current collector to be applied. Since the vinylidene fluoride polymer generally has excellent oxidation resistance, the electrode mixture of the present embodiment can be suitably used as an electrode mixture for a positive electrode. Further, since the vinylidene fluoride polymer generally has excellent reduction resistance, the electrode mixture of the present embodiment can be suitably used as an electrode mixture for the negative electrode.
- a lithium composite metal oxide is typically used as the positive electrode active material.
- lithium composite metal oxides for example, LiMnO 2, LiMn 2 O 4 , LiCoO 2, LiNiO 2, LiNi x Co 1-x O 2 (0 ⁇ x ⁇ 1), LiNi x Co y Mn 1-x-y O 2 (0 ⁇ x ⁇ 1,0 ⁇ y ⁇ 1), be LiNi x Co y Al Z O 2 (0.55 ⁇ x ⁇ 1,0 ⁇ y2 ⁇ 0.55,0 ⁇ z ⁇ 0.55 , And x / (x + y + z) ⁇ 0.55.), LiFePO 4, and the like.
- lithium composite metal oxide examples include Li 1.00 Ni 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) and Li 1.00 Ni 0.6 Co 0.2 Mn 0.2 O 2 (NCM622), Li 1.00 Ni 0.83 Co 0.12 Mn 0.05 O 2 (NCM811), and Li 1.00 Ni 0.85 Co 0.15 Al 0.05 O 2 (NCA811). be able to.
- the negative electrode active material conventionally known materials such as carbon materials, metal / alloy materials, and metal oxides can be used. Of these, a carbon material is preferable from the viewpoint of further increasing the energy density of the battery, and examples of the carbon material include artificial graphite, natural graphite, non-graphitized carbon, and easily graphitized carbon.
- the electrode mixture preferably contains 0.2 to 15 parts by mass of the vinylidene fluoride polymer, and preferably contains 0.5 to 10 parts by mass. More preferred.
- the conductive auxiliary agent may be added for the purpose of improving the conductivity of the electrode mixture layer when an active material having low electron conductivity such as LiCoO 2 is used.
- the conductive auxiliary agent for example, carbonaceous substances such as carbon black, carbon nanotubes, graphite fine powder and graphite fiber, and metal fine powder or metal fiber such as nickel and aluminum can be used.
- Non-aqueous solvent As the non-aqueous solvent, those exemplified as the non-aqueous solvent that can be contained in the above-mentioned composition for electrode mixture can be used, and examples thereof include N-methylpyrrolidone (NMP). Further, the non-aqueous solvent may be used alone or in combination of two or more.
- NMP N-methylpyrrolidone
- the electrode mixture in the present embodiment may contain components other than the above-mentioned components.
- examples of other components include pigment dispersants such as polyvinylpyrrolidone.
- the electrode mixture according to the present embodiment may be prepared by mixing, for example, a composition for an electrode mixture containing a synthetic resin and a polyisocyanate compound and an active material so as to form a uniform slurry, and the order of mixing is as follows. There is no particular limitation. Further, when a composition for an electrode mixture containing a solvent is used as the composition for the electrode mixture, an electrode active material or the like may be added before the solvent is added to the composition for the electrode mixture. For example, the electrode active material may be added to the composition for the electrode mixture, then the solvent may be added, and the mixture may be stirred and mixed to obtain the electrode mixture.
- the electrode active material may be dispersed in a solvent, the composition for the electrode mixture may be added thereto, and the mixture may be stirred and mixed to obtain the electrode mixture.
- the electrode active material may be added to the composition for the electrode mixture containing a solvent as the composition for the electrode mixture, and the mixture may be stirred and mixed to obtain the electrode mixture.
- It can also be prepared by mixing a polyisocyanate compound and an active material and then mixing a synthetic resin.
- the electrode according to the present embodiment includes an electrode mixture layer formed from the electrode mixture on the current collector.
- the "electrode” in the present specification and the like means an electrode of a battery in which an electrode mixture layer formed from the electrode mixture of the present embodiment is formed on a current collector.
- the current collector is the base material of the electrode and is a terminal for extracting electricity.
- Examples of the material of the current collector include iron, stainless steel, steel, copper, aluminum, nickel, titanium and the like.
- the shape of the current collector is preferably foil or net.
- the current collector is preferably an aluminum foil.
- the thickness of the current collector is preferably 1 ⁇ m to 100 ⁇ m, more preferably 3 to 20 ⁇ m.
- the electrode mixture layer is a layer obtained by applying the above-mentioned electrode mixture to a current collector and drying it.
- a method for applying the electrode mixture a method known in the art can be used, and a method using a bar coater, a die coater, a comma coater, or the like can be mentioned.
- the drying temperature for forming the electrode mixture layer is preferably 50 ° C. to 200 ° C., more preferably 80 ° C. to 180 ° C.
- the electrode mixture layer may be formed on both sides of the current collector, or may be formed on only one of the surfaces.
- the thickness of the electrode mixture layer is usually 20 to 600 ⁇ m, preferably 20 to 350 ⁇ m per side surface. Alternatively, the electrode mixture layer may be pressed to increase the density.
- the basis weight of the electrode mixture layer is usually 20 to 700 g / m 2 , preferably 30 to 500 g / m 2 .
- the electrode becomes a positive electrode when an electrode mixture layer for a positive electrode is obtained, and a negative electrode when an electrode mixture layer for a negative electrode is obtained. It becomes.
- the electrode according to this embodiment can be used as a positive electrode of a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery, for example.
- a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery
- it can be used as a negative electrode of a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery.
- the method for manufacturing an electrode according to the present embodiment includes a coating step of applying the electrode mixture to the current collector and a heating and drying step of heating and drying the current collector after the coating step at a temperature of 80 ° C. or higher. Including.
- the electrode mixture is applied to the current collector.
- a method for applying the electrode mixture a method known in the art can be used, and a method using a bar coater, a die coater, a comma coater, or the like can be mentioned.
- the current collector after the coating step is heat-dried at a temperature of 80 ° C. or higher, preferably 110 ° C. or higher.
- the blocking agent can be dissociated from the blocked isocyanate group by heating and drying within the above temperature range. Further, it is preferable that the temperature of the electrode mixture applied to the current collector is 80 ° C. or higher.
- the heating and drying temperature may be appropriately selected depending on the type of blocking agent.
- the blocking agent blocking the isocyanate group is an oxime compound, it is more preferable to heat-dry it at 110 to 180 ° C.
- the blocking agent blocking the isocyanate group is an active methylene compound, it is more preferable to heat-dry it at 80 to 150 ° C.
- the blocking agent blocking the isocyanate group is a pyrazole compound, it is more preferable to heat-dry it at 80 to 180 ° C.
- the heating and drying time is not particularly limited, but is preferably 1 to 300 minutes, and may be appropriately selected depending on the heating temperature.
- the method for manufacturing the electrode according to the present embodiment includes a coating step of applying the electrode mixture to the current collector, and a drying step of heating and drying the current collector after the coating step at a temperature of 110 ° C. or lower. It may include a heat treatment step of treating the current collector after the drying step at a temperature higher than the temperature of the drying step and at a temperature of 110 ° C. or higher.
- the coating step is the same as the coating step described above (method for manufacturing an electrode by heating in one step).
- the current collector after the coating step is heated and dried at a temperature of 110 ° C. or lower.
- the temperature of the electrode mixture applied to the current collector is 110 ° C. or lower.
- the drying time is not particularly limited, but is preferably 1 to 100 minutes.
- the current collector after the drying step is heat-treated at a temperature higher than the temperature of the drying step and at a temperature of 110 ° C. or higher.
- the blocking agent can be dissociated from most of the blocked isocyanate groups.
- the temperature of the electrode mixture applied to the current collector is 110 ° C. or higher.
- the heat treatment temperature may be appropriately selected depending on the type of blocking agent.
- the blocking agent blocking the isocyanate group is an oxime compound
- heat treatment at 120 to 180 ° C. is more preferable.
- the blocking agent blocking the isocyanate group is an active methylene compound
- the blocking agent blocking the isocyanate group is a pyrazole compound
- the heat treatment time is not particularly limited, but is preferably 1 to 300 minutes, and may be appropriately selected depending on the heating temperature.
- the electrode manufactured by the multi-step heating can increase the adhesive strength between the current collector and the electrode mixture layer as compared with the electrode manufactured by the one-step heating. The reason for this is thought to be as follows.
- the isocyanate group binds to the OH group present in the active material and the current collector (for example, aluminum foil) to form an interface between the active material and the vinylidene fluoride polymer, and an interface between the current collector and the electrode mixture layer. It is considered that the adhesiveness in the above is improved. Isocyanate groups are more likely to react preferentially with amines than OH groups. Therefore, when the blocking agent is dissociated from the blocked isocyanate group and the isocyanate group is regenerated, if a large amount of amine contained in the dispersion medium or the like is present around the isocyanate group, it is more than the OH group present in the active material and the current collector. , Isocyanate groups react with amines.
- the abundance of amine is reduced by removing the dispersion medium in the electrode mixture layer by heating in the first step. Then, it is considered that by dissociating the blocking agent from the blocked isocyanate group by heating in the second and subsequent steps, the regenerated isocyanate group is bonded to the OH group existing in the active material and the current collector, and the adhesiveness is improved.
- the isocyanate group tends to react in the order of amine, OH group, and COOH group.
- Non-aqueous electrolyte secondary battery of the present embodiment includes the above electrodes.
- the other members of the non-aqueous electrolyte secondary battery are not particularly limited, and for example, conventionally used members can be used.
- Examples of the method for manufacturing a non-aqueous electrolyte secondary battery include a method in which a negative electrode layer and a positive electrode layer are overlapped with each other via a separator, placed in a battery container, and an electrolytic solution is injected into the battery container to seal the battery.
- this production method at least a part of the vinylidene fluoride polymer contained in the electrode mixture is melted and adhered to the separator by hot pressing after injecting the electrode solution.
- the composition for an electrode mixture according to the present embodiment includes a synthetic resin containing a vinylidene fluoride polymer in a proportion of 99% by mass or more, a polyisocyanate compound in which at least a part of the isocyanate groups are blocked by a blocking agent, and the like. It is a composition for an electrode mixture containing.
- the polyisocyanate compound is at least one compound selected from an isocyanurate form, a bullet form and an adduct form derived from hexamethylene diisocyanate. ..
- the blocking agent is at least one blocking agent selected from the group consisting of an oxime compound, an active methylene compound and a pyrazole compound.
- the blocking agent is an oxime compound.
- the content of the polyisocyanate compound with respect to 100 parts by mass of the synthetic resin is preferably 0.5 to 50 parts by mass.
- the vinylidene fluoride polymer may be a homopolymer of vinylidene fluoride.
- the vinylidene fluoride polymer contains vinylidene fluoride as a main component and is a structural unit derived from unsaturated dibasic acid, an unsaturated dibasic acid monoester.
- R 1 , R 2 , and R 3 are independently hydrogen atoms, fluorine atoms, chlorine atoms, or alkyl groups having 1 to 5 carbon atoms
- X' is an atomic group having a main chain composed of 1 to 19 atoms and having a molecular weight of 472 or less
- X'' is a molecular weight 484 whose main chain is composed of 1 to 19 atoms. It is the following atomic group, and in the formula (3), X'''is hydrogen or a hydrocarbon moiety having 1 to 5 carbon atoms containing at least one hydroxyl group.
- the electrode mixture according to the present embodiment contains the composition for the electrode mixture and the active material.
- the electrode according to the present embodiment includes an electrode mixture layer formed from the electrode mixture on the current collector.
- the non-aqueous electrolyte secondary battery according to the present embodiment includes the electrodes.
- the method for manufacturing an electrode according to the present embodiment includes a coating step of applying the electrode mixture to a current collector and a heat drying step of heating and drying the current collector after the coating step at a temperature of 80 ° C. or higher. Including.
- the method for manufacturing the electrode according to the present embodiment includes a coating step of applying the electrode mixture to the current collector, and a drying step of heating and drying the current collector after the coating step at a temperature of 110 ° C. or lower. It includes a heat treatment step of treating the current collector after the drying step at a temperature higher than the temperature of the drying step and 110 ° C. or higher.
- Example 1 Preparation of electrode mixture
- 100 parts by mass of Li 1.0 Ni 0.5 Co 0.2 Mn 0.3 O 2 (NCM523, average particle size 11 ⁇ m) was used.
- As the conductive carbon black 2 parts by mass of Super-P (manufactured by Timcal Japan, average particle diameter 40 nm, specific surface area 60 m 2 / g) was used.
- As the synthetic resin 2 parts by mass of polyvinylidene fluoride (KF # 9700 manufactured by Kureha Corporation) was used.
- polyisocyanate compound 0.38 parts by mass of polyisocyanate (Duranate (trademark) TPA-B80E manufactured by Asahi Kasei Chemicals Co., Ltd.) was used.
- a slurry positive electrode mixture (electrode mixture) was prepared by dispersing the positive electrode active material, conductive carbon black, synthetic resin and polyisocyanate compound in NMP.
- Example 2 Preparation of electrode mixture The electrode mixture was prepared in the same manner as in Example 1 except that the amount of the polyisocyanate compound was 0.04 parts by mass.
- Example 3 Preparation of electrode mixture The electrode mixture was prepared in the same manner as in Example 1 except that the amount of the polyisocyanate compound was 0.16 parts by mass.
- Example 4 Preparation of electrode mixture The electrode mixture was prepared in the same manner as in Example 1 except that the amount of the polyisocyanate compound was 0.57 parts by mass.
- Example 5 Preparation of electrode mixture
- the electrode mixture was prepared in the same manner as in Example 1 except that the polyisocyanate compound was SBN-70D (manufactured by Asahi Kasei Chemicals Co., Ltd.).
- Example 6 Preparation of electrode mixture
- the electrode mixture was prepared in the same manner as in Example 1 except that the polyisocyanate compound was MF-K60B (manufactured by Asahi Kasei Chemicals Co., Ltd.).
- Electrode mixture was prepared in the same manner as in Example 1 except that the amount of the synthetic resin was 2.38 parts by mass and the polyisocyanate compound was not used.
- Electrode mixture was prepared in the same manner as in Example 1 except that the amount of the synthetic resin was 3 parts by mass and the polyisocyanate compound was not used.
- Example 7 Preparation of electrode mixture The electrode mixture was prepared in the same manner as in Example 1 except that the synthetic resin was KF # 7300 (manufactured by Kureha Corporation).
- Example 8 Preparation of electrode mixture The electrode mixture was prepared in the same manner as in Example 1 except that the synthetic resin was KF # 9100 (manufactured by Kureha Corporation).
- Example 9 Preparation of electrode mixture The electrode mixture was prepared in the same manner as in Example 1 except that the synthetic resin was KF # 7500 (manufactured by Kureha Corporation).
- Example 10 Preparation of electrode mixture
- the electrode mixture was prepared in the same manner as in Example 1 except that the positive electrode active material was LiCoO 2 (LCO cell seed C5H, manufactured by Nippon Kagaku Kogyo Co., Ltd., average particle size 5 ⁇ m). ..
- Example 11 Preparation of electrode mixture
- the electrode mixture was prepared in the same manner as in Example 1 except that the positive electrode active material was LiFePO 4 (LFP, average particle diameter 1.2 ⁇ m, specific surface area 14.7 m 2 / g). Prepared.
- Example 12 Preparation of electrode mixture
- the positive electrode active material is Li 1.0 Ni 0.85 Co 0.15 Al 0.05 O 2 (NCA811, average particle size 14.7 ⁇ m, specific surface area 0.17 m 2 / g). ), An electrode mixture was prepared in the same manner as in Example 1.
- Example 13 Preparation of electrode mixture The electrode mixture was prepared in the same manner as in Example 12 except that the polyisocyanate compound was SBN-70D.
- Electrode mixture As the negative electrode active material, 95 parts by mass of natural graphite (BTR NEW ENERGY MATERIALS INC, BTR (registered trademark) 918) was used. As the synthetic resin, 4.5 parts by mass of polyvinylidene fluoride (KF # 9700 manufactured by Kureha Corporation) was used. As the polyisocyanate compound, 0.5 parts by mass of polyisocyanate (Duranate (trademark) TPA-B80E manufactured by Asahi Kasei Chemicals Co., Ltd.) was used. A slurry-like negative electrode mixture (electrode mixture) was prepared by dispersing the negative electrode active material, synthetic resin and polyisocyanate compound in NMP.
- Electrode Mixture The electrode mixture was prepared in the same manner as in Example 14 except that the amount of the synthetic resin was 5.0 parts by mass and the polyisocyanate compound was not used.
- Example 15 Preparation of electrode mixture The electrode mixture was prepared in the same manner as in Example 14 except that the synthetic resin was KF # 7300 (manufactured by Kureha Corporation).
- the single-sided coating electrode is cut into a length of 50 mm and a width of 20 mm, and a tensile tester (UNIVERSAL TESTING INSTRUMENT MODEL: STA-1150 manufactured by Orientec Co., Ltd.) is used according to JIS K6854-1, and the head speed is 10 mm / A 90-degree peel test was performed in minutes, and the peel strength (gf / mm) was measured. Table 1 shows the measurement results of the peel strength.
- Viscosity measurement of electrode mixture The slurry viscosity of the positive electrode mixture obtained in Examples 12 and 13 and Comparative Example 12 is measured with a B-type viscometer (BROOKFIELD digital viscometer LV DV-E). Measured using .64. After preliminary stirring at 0.5 rpm for 1 minute, measurements were taken at 1.0 rpm for 2 minutes, 6.0 rpm for 2 minutes, and 12 rpm for 2 minutes. The value of the viscosity after 2 minutes at 1.0 rpm was defined as the slurry viscosity.
- the viscosity of the slurry was measured for a certain period of time (3 hours, 6 hours, 24 hours, 48 hours, 72 hours with the storage start time as 0 hour). ) I went every time. When the slurry viscosity exceeded 400,000 mPa ⁇ s, it was determined that the positive electrode mixture was gelled.
- Example 1 Comparative Examples 5 and 6 are compared, the electrode mixture of Example 1 containing a polyisocyanate compound in which at least a part of the isocyanate groups are blocked isocyanate groups is sufficiently used. It showed high peel strength.
- the electrode mixture of Comparative Example 5 containing an isocyanate compound having a blocked isocyanate group, which is not a polyisocyanate compound, was used the peel strength was not sufficient. Further, the peel strength was not sufficient even when the electrode mixture of Comparative Example 6 containing the polyisocyanate compound in which the isocyanate group was not blocked was used. From these results, it is possible to increase the adhesive strength between the current collector and the electrode mixture layer by using a polyisocyanate compound in which at least a part of the isocyanate groups are blocked isocyanate groups. Do you get it.
- Table 2 shows the measurement results of the peel strength in Evaluation Examples 3 to 9.
- Evaluation Examples 3 to 4 showed high peel strength, and Evaluation Example 5 using an electrode mixture containing no polyisocyanate compound showed low peel strength. Further, when the evaluation examples 3 and 4 were compared, the peel strength of the evaluation example 4 in which the heating and drying temperature was set to 100 ° C. was the highest.
- evaluation examples 6 to 8 showed high peel strength, and evaluation example 9 using an electrode mixture containing no polyisocyanate compound showed low peel strength. Further, when the evaluation examples 6 to 8 were compared, the peel strength of the evaluation example 6 in which the heating and drying temperature was 100 ° C. was the highest.
- the polyisocyanate compound used in Evaluation Examples 6 to 8 is a polyisocyanate compound in which at least a part of the isocyanate groups are blocked by a blocking agent. Then, when the polyisocyanate compound is heated at around 130 ° C., the blocking agent is dissociated from the isocyanate groups and the isocyanate groups are regenerated.
- Evaluation Example 8 it is considered that the blocking agent was dissociated from most of the blocked isocyanate groups in the heating and drying step by setting the heating and drying temperature to 130 ° C.
- the heating and drying temperature was 110 ° C. or lower
- the blocking agent dissociated from the blocked isocyanate groups in the heating and drying step, and the blocking agent dissociated from most of the blocked isocyanate groups in the heat treatment step It is probable that it was done.
- the blocked isocyanate groups are dried at a temperature at which the blocking agent dissociates less, and then dried (heat treated) at a temperature at which most of the blocking agents dissociate from the blocked isocyanate groups. It was found that the adhesive strength between the current collector and the electrode mixture layer can be further increased.
- the single-sided coating electrode is cut into a length of 50 mm and a width of 20 mm, and a tensile tester (UNIVERSAL TESTING INSTRUMENT MODEL: STA-1150 manufactured by Orientec Co., Ltd.) is used according to JIS K6854-1, and the head speed is 10 mm / A 90-degree peel test was performed in minutes, and the peel strength (gf / mm) was measured. The measurement results of the peel strength are shown in Table 3.
- the present invention can be used as an electrode mixture applied to a current collector in the manufacture of electrodes for non-aqueous electrolyte secondary batteries.
Abstract
Description
本実施形態に係る電極合剤用組成物は、合成樹脂と、ポリイソシアネート化合物と、を含む。
合成樹脂は、フッ化ビニリデン重合体を99質量%以上の割合で含めばよく、一態様としては、フッ化ビニリデン重合体のみを含む。合成樹脂に他の重合体を含ませる場合、本実施形態の電極合剤用組成物の所望の効果が損なわれない限り特に制限はない。合成樹脂の一態様としては、他の重合体として(メタ)アクリル重合体を含んでいない合成樹脂であり得る。フッ化ビニリデン重合体を99質量%以上の割合で含むことにより、本実施形態に係る電極合剤用組成物を用いた場合の集電体と電極合剤層との接着強度を高めることができる。また、フッ化ビニリデン重合体を99質量%以上の割合で含むことは、電気化学的安定性の観点からも好ましい。
本明細書において「フッ化ビニリデン重合体」とは、フッ化ビニリデンの単独重合体(ホモポリマー)、およびフッ化ビニリデンと共重合可能な単量体(モノマー)とフッ化ビニリデンとの共重合体(コポリマー)の何れをも含むものである。フッ化ビニリデンと共重合可能な単量体としては、例えば、公知の単量体の中から適宜に選ぶことができる。フッ化ビニリデンを共重合させる場合、フッ化ビニリデン単位を50モル%以上で含有することが好ましく、フッ化ビニリデン単位を80モル%以上で含有することがより好ましく、フッ化ビニリデン単位を90モル%以上で含有することが特に好ましい。
フッ化ビニリデン重合体としては、市販のものを用いることができる。例えば、株式会社クレハ製のKF#7300、KF#9100、KF#9700、KF#7500等が挙げられる。
本実施形態で用いられるフッ化ビニリデン重合体のインヘレント粘度は、特に限定されないが、0.5~5.0dl/gであることが好ましく、1.0dl/g以上4.5dl/g以下であることがより好ましく、1.5dl/g以上4.0dl/g以下であることがさらに好ましい。
(フッ化ビニリデン重合体の重合方法)
フッ化ビニリデン重合体の重合方法としては、特に限定はなく、従来公知の重合方法を用いることができる。重合方法としては、例えば懸濁重合、乳化重合、溶液重合等が挙げられるが、その中でも後処理の容易さ等の観点から水系の懸濁重合、乳化重合が好ましく、水系の懸濁重合が特に好ましい。
本実施形態の電極合剤用組成物に含まれるポリイソシアネート化合物は、少なくとも一部のイソシアネート基がブロック剤でブロックされている。すなわち、ポリイソシアネート化合物は、少なくとも1つのブロックイソシアネート基を有する。本明細書において、「ブロックイソシアネート基」は、ブロック剤でブロック(安定化)されているイソシアネート基を示す。
本実施形態の電極合剤用組成物における、合成樹脂100質量部に対するポリイソシアネート化合物の含有量は、0.5~50質量部であることが好ましく、2~40質量部であることがより好ましい。合成樹脂に対するポリイソシアネート化合物の質量比が上記範囲内であると、集電体と電極合剤層との接着強度を高めることができる。接着強度を高める観点から、合成樹脂のインヘレント粘度は、合成樹脂の好ましい粘度範囲の中で高いことが好ましい。
本実施形態の電極合剤は、上記電極合剤用組成物と、活物質と、を含む。電極合剤は、導電助剤、非水溶媒、顔料分散剤および分散安定剤等を含んでいてもよい。
正極活物質としては、リチウム複合金属酸化物が典型的に用いられる。
導電助剤は、LiCoO2等の電子伝導性の小さい活物質を使用する場合に、電極合剤層の導電性を向上する目的で添加してもよい。導電助剤としては、例えば、カーボンブラック、カーボンナノチューブ、黒鉛微粉末および黒鉛繊維等の炭素質物質、ならびにニッケルおよびアルミニウム等の金属微粉末または金属繊維を用いることができる。
非水溶媒は、上述の電極合剤用組成物に含み得る非水溶媒として例示したものを用いることができ、例として、N-メチルピロリドン(NMP)等が挙げられる。また、非水溶媒は1種単独でも、2種以上を混合してもよい。
本実施形態における電極合剤は、上述の成分以外の他の成分を含んでいてもよい。他の成分としては、例えば、ポリビニルピロリドンなどの顔料分散剤等を挙げることができる。
本実施形態に係る電極合剤は、例えば、合成樹脂とポリイソシアネート化合物とを含む電極合剤用組成物、および活物質を均一なスラリーとなるように混合すればよく、混合する際の順序は特に限定されない。さらに電極合剤用組成物として溶媒を含む電極合剤用組成物を用いる場合、電極合剤用組成物に当該溶媒を加える前に、電極活物質等を加えてもよい。例えば、電極合剤用組成物に電極活物質を添加し、次いで溶媒を添加し、撹拌混合し、電極合剤を得てもよい。また電極活物質を溶媒に分散し、そこへ電極合剤用組成物を添加し、撹拌混合し、電極合剤を得てもよい。あるいは、電極合剤用組成物として溶媒を含む電極合剤用組成物に電極活物質を添加し、撹拌混合し、電極合剤を得てもよい。
本実施形態に係る電極は、上記電極合剤から形成された電極合剤層を集電体上に備える。本明細書等における「電極」とは、特に断りのない限り、本実施形態における電極合剤から形成される電極合剤層が集電体上に形成されている、電池の電極を意味する。
集電体は、電極の基材であり、電気を取り出すための端子である。集電体の材質としては、鉄、ステンレス鋼、鋼、銅、アルミニウム、ニッケル、およびチタン等を挙げることができる。集電体の形状は、箔または網であることが好ましい。電極が正極である場合、集電体としては、アルミニウム箔とすることが好ましい。集電体の厚みは、1μm~100μmであることが好ましく、3~20μmがより好ましい。
電極合剤層は、上述した電極合剤を集電体に塗布して、乾燥させることにより得られる層である。電極合剤の塗布方法としては、当該技術分野における公知の方法を用いることができ、バーコーター、ダイコーターまたはコンマコーターなどを用いる方法を挙げることができる。電極合剤層を形成させるための乾燥温度としては、50℃~200℃であることが好ましく、80℃~180℃であることがより好ましい。電極合剤層は集電体の両面に形成されてもよいし、いずれか一方の面のみに形成されてもよい。
以下、電極の製造方法の一例を具体的に説明するが、本実施形態に係る電極の製造方法は、以下の方法に限定されるものではない。
本実施形態に係る電極の製造方法は、集電体に上記電極合剤を塗布する塗布工程と、上記塗布工程後の集電体を80℃以上の温度で加熱乾燥させる加熱乾燥工程と、を含む。
塗布工程において、電極合剤を集電体に塗布する。電極合剤の塗布方法としては、当該技術分野における公知の方法を用いることができ、バーコーター、ダイコーターまたはコンマコーターなどを用いる方法を挙げることができる。
加熱乾燥工程において、上記塗布工程後の集電体を80℃以上の温度で加熱乾燥させ、好ましくは110℃以上の温度で加熱乾燥させる。上記の温度範囲内で加熱乾燥させることによって、ブロックイソシアネート基からブロック剤を解離することができる。また、集電体に塗布された電極合剤の温度が80℃以上の温度になっていることが好ましい。
また、本実施形態に係る電極の製造方法は、集電体に上記電極合剤を塗布する塗布工程と、上記塗布工程後の集電体を110℃以下の温度で加熱乾燥させる乾燥工程と、上記乾燥工程後の集電体を乾燥工程の温度より高く、かつ110℃以上の温度で処理する熱処理工程と、を含んでいてもよい。塗布工程は、上記(1段階による加熱による電極の製造方法)の塗布工程と同じである。
乾燥工程において、上記塗布工程後の集電体を110℃以下の温度で加熱乾燥させる。当該乾燥工程においては、ブロックイソシアネート基から大部分のブロック剤が解離しない温度かつ電極合剤中の溶媒を除去できる温度で加熱乾燥させることが好ましい。具体的には、110℃以下の温度で加熱乾燥させることが好ましく、100℃以下の温度で加熱乾燥させることがより好ましい。また、集電体に塗布された電極合剤の温度が110℃以下の温度になっていることが好ましい。
熱処理工程においては、上記乾燥工程後の集電体を乾燥工程の温度より高く、かつ110℃以上の温度で加熱処理する。上記の温度範囲内で加熱処理することによって、大部分のブロックイソシアネート基からブロック剤が解離することができる。また、集電体に塗布された電極合剤の温度が110℃以上の温度になっていることが好ましい。
本実施形態の非水電解質二次電池は、上記電極を備える。非水電解質二次電池における他の部材については特に限定されるものでなく、例えば、従来用いられている部材を用いることができる。
本実施形態に係る電極合剤用組成物は、フッ化ビニリデン重合体を99質量%以上の割合で含む合成樹脂と、少なくとも一部のイソシアネート基がブロック剤でブロックされているポリイソシアネート化合物と、を含む、電極合剤用組成物である。
正極活物質として、100質量部のLi1.0Ni0.5Co0.2Mn0.3O2(NCM523、平均粒子径11μm)を使用した。導電性カーボンブラックとして、2質量部のSuper-P(Timcal Japan製、平均粒子径40nm、比表面積60m2/g)を使用した。合成樹脂として、2質量部のポリフッ化ビニリデン(株式会社クレハ製 KF#9700)を使用した。ポリイソシアネート化合物として、0.38質量部のポリイソシアネート(旭化成ケミカルズ株式会社製 デュラネート(商標) TPA-B80E)を使用した。正極活物質、導電性カーボンブラック、合成樹脂およびポリイソシアネート化合物をNMPに分散させて、スラリー状の正極合剤(電極合剤)を調製した。
ポリイソシアネート化合物の量を0.04質量部とした以外は、実施例1と同様に電極合剤を調製した。
ポリイソシアネート化合物の量を0.16質量部とした以外は、実施例1と同様に電極合剤を調製した。
ポリイソシアネート化合物の量を0.57質量部とした以外は、実施例1と同様に電極合剤を調製した。
ポリイソシアネート化合物をSBN-70D(旭化成ケミカルズ株式会社製)とした以外は、実施例1と同様に電極合剤を調製した。
ポリイソシアネート化合物をMF-K60B(旭化成ケミカルズ株式会社製)とした以外は、実施例1と同様に電極合剤を調製した。
合成樹脂の量を2.38質量部とし、ポリイソシアネート化合物を使用しなかった以外は、実施例1と同様に電極合剤を調製した。
合成樹脂の量を3質量部とし、ポリイソシアネート化合物を使用しなかった以外は、実施例1と同様に電極合剤を調製した。
ポリイソシアネート化合物を2.04質量部とし、合成樹脂を使用しなかった以外は、実施例1と同様に電極合剤を調製した。
ポリイソシアネート化合物をSBN-70Dとした以外は、比較例3と同様に電極合剤を調製した。
ポリイソシアネート化合物を、イソシアネート化合物MOI-BP(昭和電工株式会社製)とした以外は、実施例1と同様に電極合剤を調製した。
ポリイソシアネート化合物を、イソシアネート基がブロックされていないポリイソシアネート化合物24A-100(旭化成株式会社製)とした以外は、実施例1と同様に電極合剤を調製した。
合成樹脂をKF#7300(株式会社クレハ製)とした以外は、実施例1と同様に電極合剤を調製した。
合成樹脂をKF#7300とした以外は、比較例1と同様に電極合剤を調製した。
合成樹脂をKF#9100(株式会社クレハ製)とした以外は、実施例1と同様に電極合剤を調製した。
合成樹脂をKF#9100とした以外は、比較例1と同様に電極合剤を調製した。
合成樹脂をKF#7500(株式会社クレハ製)とした以外は、実施例1と同様に電極合剤を調製した。
合成樹脂をKF#7500(株式会社クレハ製)とした以外は、比較例1と同様に電極合剤を調製した。
正極活物質をLiCoO2(LCOセルシードC5H、日本化学工業株式会社製、平均粒子径5μm)とした以外は、実施例1と同様に電極合剤を調製した。
正極活物質をLCOとした以外は、比較例1と同様に電極合剤を調製した。
正極活物質をLiFePO4(LFP、平均粒子径1.2μm、比表面積14.7m2/g)とした以外は、実施例1と同様に電極合剤を調製した。
正極活物質をLFPとした以外は、比較例1と同様に電極合剤を調製した。
正極活物質をLi1.0Ni0.85Co0.15Al0.05O2(NCA811、平均粒子径14.7μm、比表面積0.17m2/g)とした以外は、実施例1と同様に電極合剤を調製した。
ポリイソシアネート化合物をSBN-70Dとした以外は、実施例12と同様に電極合剤を調製した。
正極活物質をNCAとした以外は、比較例1と同様に電極合剤を調製した。
負極活物質として、95質量部の天然黒鉛(BTR NEW ENERGY MATERIALS INC社製、BTR(登録商標)918)を使用した。合成樹脂として、4.5質量部のポリフッ化ビニリデン(株式会社クレハ製 KF#9700)を使用した。ポリイソシアネート化合物として、0.5質量部のポリイソシアネート(旭化成ケミカルズ株式会社製 デュラネート(商標) TPA-B80E)を使用した。負極活物質、合成樹脂およびポリイソシアネート化合物をNMPに分散させて、スラリー状の負極合剤(電極合剤)を調製した。
合成樹脂の量を5.0質量部とし、ポリイソシアネート化合物を使用しなかった以外は、実施例14と同様に電極合剤を調製した。
合成樹脂をKF#7300(株式会社クレハ製)とした以外は、実施例14と同様に電極合剤を調製した。
合成樹脂をKF#7300(株式会社クレハ製)とした以外は、比較例13と同様に電極合剤を調製した。
各実施例および比較例で得られた正極合剤をそれぞれ、厚み15μmのAl箔上にバーコーターで塗布し、110℃で30分加熱乾燥させた。さらに130℃で2時間熱処理し、片面目付量が200g/m2の片面塗工電極を作製した。
実施例12、13および比較例12で得られた正極合剤のスラリー粘度を、B型粘度計(BROOKFIELD製 デジタル粘度計 LV DV-E)でスピンドルNo.64を用いて測定した。0.5rpmで1分間の予備攪拌後、1.0rpmで2分間、6.0rpmで2分間、12rpmで2分間測定した。1.0rpmにおける2分後の粘度の値をスラリー粘度とした。
合成樹脂の量を1.68質量部、ポリイソシアネート化合物の量を0.32質量部とした以外は、実施例5と同様に電極合剤を調製した。次に、加熱乾燥温度を90℃にし、熱処理を行わなかった以外は、評価例1と同様に剥離強度を測定した。
加熱乾燥温度を100℃にした以外は、評価例3と同様に剥離強度を測定した。
合成樹脂の量を2質量部とし、ポリイソシアネート化合物を使用しなかった以外は、実施例5と同様に電極合剤を調製した。次に、評価例3と同様に剥離強度を測定した。
合成樹脂の量を1.68質量部、ポリイソシアネート化合物の量を0.32質量部とした以外は、実施例1と同様に電極合剤を調製した。次に、加熱乾燥温度を100℃にした以外は、評価例1と同様に剥離強度を測定した。
加熱乾燥温度を110℃にした以外は、評価例6と同様に剥離強度を測定した。
加熱乾燥温度を130℃にした以外は、評価例6と同様に剥離強度を測定した。
合成樹脂の量を2質量部とし、ポリイソシアネート化合物を使用しなかった以外は、実施例1と同様に電極合剤を調製した。次に、評価例1と同様に剥離強度を測定した。
実施例14および15ならびに比較例13および14で得られた負極合剤をそれぞれ、厚み10μmのCu箔上にバーコーターで塗布し、110℃で30分加熱乾燥させた。さらに130℃で2時間熱処理し、片面目付量が150g/m2の片面塗工電極を作製した。
Claims (12)
- フッ化ビニリデン重合体を99質量%以上の割合で含む合成樹脂と、
少なくとも一部のイソシアネート基がブロック剤でブロックされているポリイソシアネート化合物と、を含む、電極合剤用組成物。 - 前記ポリイソシアネート化合物が、ヘキサメチレンジイソシアネートから誘導されるイソシアヌレート体、ビュレット体、アダクト体から選択される少なくとも1つの化合物である、請求項1に記載の電極合剤用組成物。
- 前記ブロック剤が、オキシム化合物、活性メチレン化合物およびピラゾール化合物からなる群から選択される少なくとも1つのブロック剤である、請求項1または2に記載の電極合剤用組成物。
- 前記ブロック剤が、オキシム化合物である、請求項1~3のいずれか1項に記載の電極合剤用組成物。
- 前記電極合剤用組成物において、前記合成樹脂100質量部に対する前記ポリイソシアネート化合物の含有量が0.5~50質量部である、請求項1~4のいずれか1項に記載の電極合剤用組成物。
- 前記フッ化ビニリデン重合体がフッ化ビニリデンの単独重合体である、請求項1~5のいずれか1項に記載の電極合剤用組成物。
- 前記フッ化ビニリデン重合体は、フッ化ビニリデンを主構成成分とし、
不飽和二塩基酸に由来する構造単位、不飽和二塩基酸モノエステルに由来する構造単位、ハロゲン化アルキルビニル化合物に由来する構造単位、以下の式(1)で示される化合物に由来する構造単位、以下の式(2)で示される化合物に由来する構造単位、および、以下の式(3)で示される化合物に由来する構造単位の少なくとも1つの構造単位を含有するフッ化ビニリデン共重合体である、請求項1~5のいずれか1項に記載の電極合剤用組成物。
式(1)において、X'は、主鎖が原子数1~19で構成される分子量472以下の原子団であり、
式(2)において、X''は、主鎖が原子数1~19で構成される分子量484以下の原子団であり、
式(3)において、X'''は、水素または少なくとも一つのヒドロキシル基を含む炭素数1~5の炭化水素部分である。) - 請求項1~7のいずれか1項に記載の電極合剤用組成物と、活物質と、を含む電極合剤。
- 請求項8に記載の電極合剤から形成された電極合剤層を集電体上に備える電極。
- 請求項9に記載の電極を備える非水電解質二次電池。
- 集電体に請求項8に記載の電極合剤を塗布する塗布工程と、
前記塗布工程後の集電体を80℃以上の温度で加熱乾燥させる加熱乾燥工程と、を含む、電極の製造方法。 - 集電体に請求項8に記載の電極合剤を塗布する塗布工程と、
前記塗布工程後の集電体を110℃以下の温度で加熱乾燥させる乾燥工程と、
前記乾燥工程後の集電体を乾燥工程の温度より高く、かつ110℃以上の温度で処理する熱処理工程を含む、電極の製造方法。
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