WO2006030681A1 - 非水電解液二次電池及び非水電解液 - Google Patents
非水電解液二次電池及び非水電解液 Download PDFInfo
- Publication number
- WO2006030681A1 WO2006030681A1 PCT/JP2005/016484 JP2005016484W WO2006030681A1 WO 2006030681 A1 WO2006030681 A1 WO 2006030681A1 JP 2005016484 W JP2005016484 W JP 2005016484W WO 2006030681 A1 WO2006030681 A1 WO 2006030681A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- aqueous electrolyte
- negative electrode
- secondary battery
- carbonate
- active material
- Prior art date
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- 239000011255 nonaqueous electrolyte Substances 0.000 title claims abstract description 169
- 239000010409 thin film Substances 0.000 claims abstract description 65
- 229910003002 lithium salt Inorganic materials 0.000 claims abstract description 35
- 159000000002 lithium salts Chemical class 0.000 claims abstract description 35
- 239000003125 aqueous solvent Substances 0.000 claims abstract description 28
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 27
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052751 metal Inorganic materials 0.000 claims abstract description 20
- 239000002184 metal Substances 0.000 claims abstract description 19
- 239000007773 negative electrode material Substances 0.000 claims description 68
- 150000001875 compounds Chemical class 0.000 claims description 51
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 29
- 239000002904 solvent Substances 0.000 claims description 22
- 229910013872 LiPF Inorganic materials 0.000 claims description 21
- 101150058243 Lipf gene Proteins 0.000 claims description 21
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 18
- 229910052799 carbon Inorganic materials 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 16
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- 229910013075 LiBF Inorganic materials 0.000 claims description 12
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 12
- 239000008151 electrolyte solution Substances 0.000 claims description 12
- 239000007774 positive electrode material Substances 0.000 claims description 12
- 229910052718 tin Inorganic materials 0.000 claims description 12
- 125000000217 alkyl group Chemical group 0.000 claims description 11
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 10
- 125000001424 substituent group Chemical group 0.000 claims description 10
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- 125000001153 fluoro group Chemical group F* 0.000 claims description 9
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- 239000010949 copper Substances 0.000 claims description 6
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 6
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- 125000004432 carbon atom Chemical group C* 0.000 claims description 4
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical group COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 4
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- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 3
- ZZXUZKXVROWEIF-UHFFFAOYSA-N 1,2-butylene carbonate Chemical compound CCC1COC(=O)O1 ZZXUZKXVROWEIF-UHFFFAOYSA-N 0.000 claims description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 2
- 150000002148 esters Chemical class 0.000 claims description 2
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 2
- XUCNUKMRBVNAPB-UHFFFAOYSA-N fluoroethene Chemical group FC=C XUCNUKMRBVNAPB-UHFFFAOYSA-N 0.000 claims description 2
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- 239000011733 molybdenum Substances 0.000 claims description 2
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- 150000003839 salts Chemical class 0.000 claims 3
- 125000002947 alkylene group Chemical group 0.000 claims 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims 1
- -1 carbonate compound Chemical class 0.000 abstract description 33
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 239000006182 cathode active material Substances 0.000 abstract 4
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- 230000000052 comparative effect Effects 0.000 description 12
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- 238000003860 storage Methods 0.000 description 5
- DHKHKXVYLBGOIT-UHFFFAOYSA-N 1,1-Diethoxyethane Chemical compound CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 4
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- XLHKMGHXUXYDQJ-UHFFFAOYSA-N ethyl 2-fluoroethyl carbonate Chemical compound CCOC(=O)OCCF XLHKMGHXUXYDQJ-UHFFFAOYSA-N 0.000 description 4
- FKRCODPIKNYEAC-UHFFFAOYSA-N ethyl propionate Chemical compound CCOC(=O)CC FKRCODPIKNYEAC-UHFFFAOYSA-N 0.000 description 4
- 125000004216 fluoromethyl group Chemical group [H]C([H])(F)* 0.000 description 4
- PIQRQRGUYXRTJJ-UHFFFAOYSA-N fluoromethyl methyl carbonate Chemical compound COC(=O)OCF PIQRQRGUYXRTJJ-UHFFFAOYSA-N 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
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- YFHICDDUDORKJB-UHFFFAOYSA-N trimethylene carbonate Chemical compound O=C1OCCCO1 YFHICDDUDORKJB-UHFFFAOYSA-N 0.000 description 4
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- FDNHWZRHURICLF-UHFFFAOYSA-N carbonic acid;3,3-dimethylbut-1-yne Chemical compound OC(O)=O.CC(C)(C)C#C FDNHWZRHURICLF-UHFFFAOYSA-N 0.000 description 1
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- 125000003262 carboxylic acid ester group Chemical group [H]C([H])([*:2])OC(=O)C([H])([H])[*:1] 0.000 description 1
- 239000005018 casein Substances 0.000 description 1
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 description 1
- 235000021240 caseins Nutrition 0.000 description 1
- DZUDZSQDKOESQQ-UHFFFAOYSA-N cobalt hydrogen peroxide Chemical compound [Co].OO DZUDZSQDKOESQQ-UHFFFAOYSA-N 0.000 description 1
- 150000001923 cyclic compounds Chemical class 0.000 description 1
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- VUPKGFBOKBGHFZ-UHFFFAOYSA-N dipropyl carbonate Chemical compound CCCOC(=O)OCCC VUPKGFBOKBGHFZ-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- YNPMWBJZZYCWEM-UHFFFAOYSA-N ethyl 1-fluoroethyl carbonate Chemical compound CCOC(=O)OC(C)F YNPMWBJZZYCWEM-UHFFFAOYSA-N 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
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- 150000002500 ions Chemical class 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 229920003049 isoprene rubber Polymers 0.000 description 1
- JMMWKPVZQRWMSS-UHFFFAOYSA-N isopropyl acetate Chemical compound CC(C)OC(C)=O JMMWKPVZQRWMSS-UHFFFAOYSA-N 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- SWAIALBIBWIKKQ-UHFFFAOYSA-N lithium titanium Chemical compound [Li].[Ti] SWAIALBIBWIKKQ-UHFFFAOYSA-N 0.000 description 1
- DMEJJWCBIYKVSB-UHFFFAOYSA-N lithium vanadium Chemical compound [Li].[V] DMEJJWCBIYKVSB-UHFFFAOYSA-N 0.000 description 1
- URIIGZKXFBNRAU-UHFFFAOYSA-N lithium;oxonickel Chemical compound [Li].[Ni]=O URIIGZKXFBNRAU-UHFFFAOYSA-N 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- LGRLWUINFJPLSH-UHFFFAOYSA-N methanide Chemical class [CH3-] LGRLWUINFJPLSH-UHFFFAOYSA-N 0.000 description 1
- CHCLGECDSSWNCP-UHFFFAOYSA-N methoxymethoxyethane Chemical compound CCOCOC CHCLGECDSSWNCP-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- CQDGTJPVBWZJAZ-UHFFFAOYSA-N monoethyl carbonate Chemical compound CCOC(O)=O CQDGTJPVBWZJAZ-UHFFFAOYSA-N 0.000 description 1
- YKYONYBAUNKHLG-UHFFFAOYSA-N n-Propyl acetate Natural products CCCOC(C)=O YKYONYBAUNKHLG-UHFFFAOYSA-N 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 239000001254 oxidized starch Substances 0.000 description 1
- 235000013808 oxidized starch Nutrition 0.000 description 1
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- 125000005010 perfluoroalkyl group Chemical group 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- AHIHJODVQGBOND-UHFFFAOYSA-M propan-2-yl carbonate Chemical compound CC(C)OC([O-])=O AHIHJODVQGBOND-UHFFFAOYSA-M 0.000 description 1
- 229940090181 propyl acetate Drugs 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
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- 239000000243 solution Substances 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
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- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0569—Liquid materials characterised by the solvents
-
- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
-
- 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
-
- 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
-
- 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
- H01M4/134—Electrodes based on metals, Si or alloys
-
- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/386—Silicon or alloys based on silicon
-
- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/387—Tin or alloys based on tin
-
- 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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
-
- 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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
-
- 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 negative electrode in which a thin film of a negative electrode active material containing a metal that absorbs and releases lithium is formed on a current collector, a positive electrode using a positive electrode active material that absorbs and releases lithium, A non-aqueous electrolyte in which a lithium salt is dissolved in an aqueous solvent, and the thin film of the negative electrode active material is separated into columns by a cut formed in the thickness direction thereof.
- the nonaqueous electrolytic solution used in the nonaqueous electrolyte secondary battery is improved, and the negative electrode is prevented from deteriorating due to charge / discharge, and the nonaqueous electrolytic solution has excellent charge / discharge cycle characteristics. It is characterized in that a secondary battery can be obtained.
- the positive electrode active material in the positive electrode includes, for example, lithium such as lithium cobalt composite oxide, lithium nickelol composite oxide, and lithium manganese composite oxide. Transition metal composite oxides are widely used, and as the negative electrode active material in the negative electrode, for example, carbon materials such as coatas, artificial graphite, and natural graphite are used alone or in combination.
- a non-aqueous electrolyte for example, a non-aqueous solvent such as propylene carbonate or dimethyl carbonate, LiPF
- lithium salts such as LiBF are used.
- the non-aqueous solvent in the non-aqueous electrolyte reacts and decomposes on the surface of the negative electrode using the carbon-based material. There was a problem that storage characteristics and cycle characteristics deteriorated.
- a negative electrode using such a negative electrode active material a silicon thin film, a tin thin film or the like is formed on a current collector by a CVD method, a screening method, a vapor deposition method, a thermal spray method, a plating method, or the like.
- a thin film of a negative electrode active material is shown.
- a high charge / discharge capacity is obtained and an excellent charge / discharge cycle characteristic is shown.
- a thin film of the negative electrode active material is separated into a columnar shape by a cut formed in the thickness direction, and the bottom of this columnar part has a structure in close contact with the current collector.
- the gap formed around the part relaxes the negative electrode active material thin film that accompanies the charge / discharge cycle. Therefore, it is considered that excellent charge / discharge cycle characteristics can be obtained (see, for example, Patent Documents 4 and 5).
- Patent Document 2 JP-A-8-45545
- Patent Document 3 Japanese Patent No. 3059832
- Non-patent literature l Solid State Ionics. 113-115.57 (1998)
- Patent Document 4 Japanese Patent Laid-Open No. 2002-83594
- Patent Document 5 Japanese Patent Laid-Open No. 2002-279972
- the present invention provides a negative electrode in which a thin film of a negative electrode active material containing a metal that absorbs and releases lithium is formed on a current collector, a positive electrode using a positive electrode active material that absorbs and releases lithium, A non-aqueous electrolyte in which a lithium salt is dissolved in an aqueous solvent, and the thin film of the negative electrode active material is separated into columns by a cut formed in the thickness direction thereof. It is an object of the present invention to solve the above-mentioned problems, and it is possible to suppress the negative electrode active material and the non-aqueous electrolyte from reacting with each other to suppress the deterioration and expansion of the negative electrode active material. At the same time, it is an object to obtain excellent charge / discharge cycle characteristics.
- a negative electrode in which a thin film of a negative electrode active material containing a metal that occludes and releases lithium is formed on a current collector, and occludes lithium. It has a positive electrode using a positive electrode active material to be released, and a non-aqueous electrolyte solution in which a lithium salt is dissolved in a non-aqueous solvent.
- the thin film of the negative electrode active material is formed into a columnar shape by a cut formed in the thickness direction.
- the compound represented by the general formula (I) shown in the following chemical formula 1 is contained in the non-aqueous electrolyte.
- R 1 and R 2 represent an unsubstituted or alkyl group having various substituents
- R and R are the same group.
- a thin film of a negative electrode active material containing a metal that absorbs and releases lithium is formed on a current collector, and the thin film of the negative electrode active material has a thickness of
- the non-aqueous electrolyte secondary battery can be obtained with a high charge / discharge capacity as described above.
- nonaqueous electrolyte secondary battery and the nonaqueous electrolyte according to the embodiment of the present invention will be specifically described.
- the non-aqueous electrolyte secondary battery and the non-aqueous electrolyte in the present invention are not limited to those shown in the following embodiments, and can be appropriately modified and implemented without departing from the scope of the invention.
- the negative electrode used in the non-aqueous electrolyte secondary battery of the present invention has a negative electrode active material thin film containing a metal that absorbs and releases lithium on a current collector as described above. Active material The thin film is separated into columns by the cuts formed in the thickness direction.
- the metal that absorbs and releases lithium used for the negative electrode active material a metal having a high capacity and capacity to absorb and release lithium is preferable.
- silicon, germanium, Tin, lead, zinc, magnesium, sodium, ananolium, potassium, indium, etc. can be used, preferably silicon, germanium, tin, aluminum, more preferably silicon or tin.
- the current collector is not particularly limited as long as the current collector is composed of a material that does not form an alloy with high lithium so that the adhesion to the thin film of the negative electrode active material is as described above.
- the current collector is composed of a material that does not form an alloy with high lithium so that the adhesion to the thin film of the negative electrode active material is as described above.
- copper, nickel, stainless steel, molybdenum, tungsten, tantalum, or the like can be used. From the viewpoint of availability, copper or nickel is preferably used, and copper is more preferably used.
- the thickness of the current collector becomes too thick, the volume occupied by the current collector in the battery increases and the capacity decreases. Therefore, it is preferable to make the thickness 30 ⁇ or less. Preferably it is 20 / m or less. On the other hand, if the thickness of the current collector becomes too thin, the strength as an electrode will be insufficient, so it is preferable to set it to l x m or more, more preferably 5 / im or more.
- the negative electrode active material in forming a thin film of the negative electrode active material as described above on such a current collector, for example, a CVD method, a sputtering method, a vapor deposition method, a thermal spray method, a method
- the negative electrode active material can be deposited on the current collector by a method or the like.
- a cut is formed by charging and discharging and separated into a columnar shape. You can make it.
- the negative electrode active material powder such as silicon powder is hardened with a binder.
- a thin film of the negative electrode active material can be formed on the current collector, and the thin film of the negative electrode active material can be separated into columns by a cut formed in the thickness direction.
- a slurry of a negative electrode mixture containing a negative electrode active material powder such as silicon powder and a binder is prepared, and this slurry is applied to a current collector having irregularities on the surface, and this is sintered to obtain a film thickness.
- Form a negative electrode active material thin film of 20 xm or less, charge and discharge using this negative electrode form a cut in the above negative electrode active material thin film, and separate the negative electrode active material thin film into columns It can be made.
- a foil having a roughened surface can be used as the current collector having irregularities formed on the surface as described above.
- a foil for example, a metal drum is immersed in an electrolytic solution in which ions are dissolved, and a current is passed while rotating the metal drum, so that metal is deposited on the surface of the drum.
- An electrolytic foil obtained by peeling the film can be used, and the surface of the electrolytic foil may be roughened.
- a metal whose surface is roughened by depositing metal on the surface of the rolled foil by an electrolytic method can be used.
- the surface roughness Ra of the current collector is preferably in the range of 0.01 ⁇ m to l ⁇ m, more preferably in the range of 0.1 ⁇ m to 0.5 ⁇ .
- the surface roughness Ra is defined in Japanese Industrial Standards (JISB 0601-1994), and the surface roughness Ra can be measured by, for example, a surface roughness meter.
- the component of the current collector diffused into the thin film of the negative electrode active material does not form an intermetallic compound with silicon because of its physical properties.
- the silicon thin film is preferably an amorphous or microcrystalline thin film.
- a mixed phase of the current collector component and the tin component of the negative electrode active material is formed between the current collector and the thin film of the negative electrode active material.
- the mixed phase may be in the state of an intermetallic compound between the current collector component and the tin component of the negative electrode active material, or may be in a solid solution state.
- such a mixed phase can be formed by heat treatment, and the conditions for the heat treatment differ depending on the type of the current collector. For example, when the current collector is composed of copper, Vacuum heat treatment is performed in the range of 100 ° C to 240 ° C, more preferably in the range of 160 ° C to 220 ° C.
- a material in which lithium is previously occluded may be used as the negative electrode active material
- Lithium may be added when forming the thin film, or after forming a thin film of the negative electrode active material, lithium may be occluded or added to the thin film of the negative electrode active material.
- a commonly used known material can be used as a positive electrode active material that absorbs and releases lithium used for the positive electrode.
- Lithium transition metal composite oxides such as lithium cobalt composite oxide, lithium nickel oxide composite oxide, lithium mangan composite oxide, lithium vanadium composite oxide, lithium iron composite oxide, lithium chromium composite oxide, lithium titanium composite oxide Can be used alone or in combination.
- the positive electrode active material in producing the positive electrode, it can be produced by a generally performed method.
- the positive electrode active material may be added to a binder, a thickener, a conductive material, a solvent as necessary. Etc. can be added to form a slurry, and this slurry can be applied to a current collector and dried to produce a positive electrode.
- the positive electrode active material is roll-molded to produce a sheet-like positive electrode, the positive electrode active material is compression-molded to produce a pellet-shaped positive electrode, or the positive electrode active material is
- a positive electrode can also be produced by depositing a thin film on a current collector by CVD, sputtering, vapor deposition, thermal spraying, or the like.
- the binder material is a solvent used in the production of the positive electrode, the non-aqueous electrolyte secondary battery.
- the material is not particularly limited as long as it is a material that is stable with respect to the non-aqueous electrolyte used and other materials used when the battery is used.
- polyvinylidene fluoride, polytetrafluoroethylene, styrene-butadiene rubber, isoprene rubber, butadiene Rubber or the like can be used.
- the material of the thickener may be There is no particular limitation as long as it is a material that is stable with respect to the solvent used during manufacturing, the non-aqueous electrolyte used in the non-aqueous electrolyte secondary battery, and other materials used when the battery is used, for example, carboxymethylolene. It is possible to use senorelose, methinorescenellose, hydroxymethinoresenorelose, ethinorescenoleose, polybutyl alcohol, oxidized starch, phosphorylated starch, casein and the like.
- the conductive material when a conductive material is used for manufacturing the positive electrode, includes a solvent used in manufacturing the positive electrode, a non-aqueous electrolyte solution used in the non-aqueous electrolyte secondary battery, and a battery.
- the material is not particularly limited as long as it is stable with respect to other materials used at the time of use, and for example, metal materials such as copper and nickel, carbon materials such as graphite and carbon black, and the like can be used.
- a current collector When a current collector is used in the production of the positive electrode, for example, a metal such as aluminum, titanium, or tantalum can be used as the material of the current collector, and it is particularly easy to process into a thin film. From the viewpoint of cost and cost, it is preferable to use an aluminum foil for the current collector.
- the non-aqueous electrolyte used in the non-aqueous electrolyte secondary battery of the present invention the non-aqueous electrolyte in which a lithium salt is dissolved in a non-aqueous solvent as described above is represented by the general formula 1 above.
- R 1 and R 2 in the general formula (I) are unsubstituted or have various substituents as described above.
- One or more fluorine atoms are bonded to at least one of R 1 and R 2.
- R 1 and R 2 may be the same group or different groups. Furthermore, R and R are
- alkyl group examples include a chain alkyl group.
- the oxidation resistance may be lowered and the solubility in the non-aqueous electrolyte may be lowered. Therefore, it is preferably a saturated or unsaturated chain alkyl group having 1 to 4 carbon atoms, specifically, methylolene, ethyl, n-propyl, i-propyl, n-butyl, i-butyl.
- it is a saturated or unsaturated chain alkyl group having 1 to 3 carbon atoms, and is a methylol group, an ethyl group, an n_propyl group, an i_propyl group, a bur group, or an aryl group. Is desirable.
- the hydrogen in the kill group may be substituted with other substituents other than fluorine.
- substituents include halogen groups such as chlorine, bromine and iodine, alkoxy groups, carbonate groups, carboxylate groups, Ability to include amino groups, etc.
- an alkyl group is preferred which has no substituent other than fluorine.
- R 1 and R 2 are independent groups
- preferred groups include
- Til fluoromethyl, trifluoromethyl, ethyl, 1 fluoroethyl, 2-fluoromethyl, 2, 2-difluoromethyl, 2, 2, 2-trifluoroethyl, n propinole, 1-fluoropropinole, 2 funoleo mouth n Propinole, 3 Funoleo mouth n Propinole, 3, 3, 3_trifluoro-n-propyl, i-propyl, 1_fluoro-i-propyl, and other groups, and from the viewpoint of solubility and stability, methyl A methyl group substituted with one or more fluorine atoms, an ethyl group, an ethyl group substituted with one or more fluorine atoms, an n-propyl group, or an n_propyl group substituted with one or more fluorine atoms.
- methinole group, fluoromethyl group, ethyl group, 1_fluoroethyl group, 2_fluoroethyl group, 2,2,2_trifluoroethyl group, n-propyl Propyl group is preferably 3 _ Furuoro n- propyl group.
- R 1 and R 2 are each an independent group and the compound represented by the general formula (I)
- fluoromethyl methyl carbonate 1_fluoroethyl methyl carbonate, 2_fluoroethyl methyl carbonate, 1_fluoro-n-propylmethylolate carbonate, 3-fluoro-n-propylmethyl carbonate, Tylfluoromethyl Carbonate, Ethyl_1_Fluoroethylcarbonate, Ethyl_2_Fluoroethylcarbonate, Ethyl_1_Fluoro-n-propylmethylcarbonate, Ethyl-3_Fluoro-n-propylmethylcarbonate, Bis (fluoromethyl) carbonate, Bis (2-fluoroethylenole ) Carbonate, 2-fluoroethylfluoromethyl carbonate, bis (3-fluoro-n-propinole) carbonate, 2_fluoretinore_3-funoleolo n-fluoropropyl carbonate, (2, 2—
- the ring is open and does not easily open.
- the total carbon number including the carbon of the substituent is in the range of 2 to 6, and the carbon number of the part constituting the ring is 2 or 3.
- ethylene carbonate trimethylene carbonate
- a compound having an unsaturated cyclic carbonate skeleton is preferably used.
- a compound having a skeleton of ethylene carbonate, propylene carbonate, vinylene carbonate, methyl vinylene carbonate, or vinyl ethylene carbonate is preferable.
- the hydrogen in R and R may be substituted with other substituents in addition to fluorine.
- substituents include halogen groups such as chlorine, bromine and iodine, alkoxy groups, carbonic acid ester groups, carboxylic acid ester groups, amino groups, and the like. Resistance to oxidation resistance, solubility, and storage stability Therefore, it is preferable that no substituent other than fluorine is present.
- Examples of the compound represented by the general formula (I) include, for example, fluoroethylene carbonate, 4, 4-difluoro-1,3-dioxolan 1_one, 4,5-difluoro-1,3-dioxolan_2_one, 4_Fluoro-5_methyl _1, 3—Dioxolane 1_one, 4_ (Fluoromethyl) _1, 3—Dioxolane 1_one, 4_ (Trifluoromethyl) _1, 3_Dioxolane _2_one, 4 _ Fluoro-5_ (Fluoromethyl) -1,1,3-dioxolan-2-one, 4 Fluoro-5 (Trifluoromethyl) -1,3 Dioxolan-2-one, 4 Fluoro-1,3_dioxol_2_one, 4,5-difluoro-1,3_dioxol_2_one, 4_fluoro-5_methyl_1,3
- fluoroethylene carbonate 4,4-difluoro-1,3-dioxolan 2 on, 4,5 difunoleolone 1,3 dixolane 2 on, 4 (funoleoromethyl) ) 1,3-Dioxolan-2-one, 4 (Trifluoromethyl) 1,3-Dioxolan-2-one, 4-Fluoro-1,3-dioxo 2-one are preferred.
- the non-aqueous electrolyte contains the compound represented by the general formula (I)
- the compound represented by the general formula (I) has a sufficient effect. Therefore, it is usually 0.01% by mass or more, preferably 0.1% by mass or more, more preferably 0.5% by mass or more with respect to the mass of the non-aqueous electrolyte excluding the lithium salt. Make it contain.
- R and R are independent groups.
- the content of the non-aqueous electrolyte excluding the lithium salt is 90% by mass or less, preferably 70% by mass or less.
- the content with respect to the mass of the non-aqueous electrolyte excluding the lithium salt is preferably 20% by mass or less, more preferably 10% by mass or less.
- the content of the non-aqueous electrolyte is preferably 20% by mass or less, more preferably 10% by mass or less, and even more preferably 5% by mass or less. It is desirable to do.
- examples of the non-aqueous solvent used in the non-aqueous electrolyte include, for example, cyclic carbonates, chain carbonates, ratatoin compounds (cyclic compounds) each having a total carbon number in the range of 3 to 9.
- Carboxylic acid ester), chain carboxylic acid ester, cyclic ether, and chain ether are preferably used.
- These non-aqueous solvents can be used alone or in admixture of two or more.
- the compound represented by the above general formula (I) and a cyclic carbonate, a chain carbonate, a rataton compound (cyclic carboxylic acid) having a total carbon number of 3 to 9 used in the non-aqueous solvent are used.
- Acid ester), chain carboxylic acid ester, cyclic ether, and chain ether if the total amount is 90% by mass or more based on the mass of the non-aqueous electrolyte excluding the lithium salt, lithium ions in the non-aqueous electrolyte Improves conductivity and stability, and improves battery characteristics when used in non-aqueous electrolyte secondary batteries.
- the non-aqueous solvent is a chain carbonate having a total carbon number in the range of 3 to 9 and the general formula (I) in which R and R are independent groups.
- those containing at least one selected from one group and one or more solvents selected from the group consisting of cyclic carbonates having a total carbon number of 3 to 9 and a rataton compound are preferred. It is desirable that at least 20% by mass of one or more solvents selected from the group consisting of the above cyclic carbonates and ratatones are contained. That is, in such a non-aqueous solvent, a cyclic carbonate ratataton compound having a total carbon number of 3 to 9 as a high dielectric constant solvent and a total carbon number of 3 to 9 as a low dielectric constant solvent.
- the lithium ion conductivity and stability are excellent, and when used in non-aqueous electrolyte secondary batteries, the balance of battery characteristics is further improved.
- examples of the cyclic carbonate having a total carbon number in the range of 3 to 9 include, for example, ethylene carbonate, propylene carbonate, butylene carbonate, vinylene carbonate, butylethylene carbonate, and the like. It is preferable to use ethylene carbonate or propylene carbonate.
- Examples of the chain carbonate having a total carbon number in the range of 3 to 9 include, for example, dimethyl carbonate, jetyl carbonate, di-n-propyl carbonate, diisopropinole carbonate, n-propinole isopropyl carbonate, di-n-butyl.
- Ratatoni ⁇ product total carbon number in the range of 3 to 9 for example, I - Puchirora Taton, 7 Barerorataton, .delta. like can be exemplified Barerorataton, in particular, I - butyl port It is preferable to use rataton.
- Examples of the chain ether having a total carbon number of 3 to 9 include dimethoxymethane, dimethoxyethane, diethoxymethane, diethoxyethane, ethoxymethoxymethane, and ethoxymethoxyethane. In particular, it is preferable to use dimethoxyethane or diethoxyethane.
- lithium salt used in the non-aqueous electrolyte an inorganic or organic lithium salt generally used in non-aqueous electrolytes is used.
- inorganic lithium salt for example, inorganic fluoride salts such as LiPF, LiAsF, LiAlF, and perhalogenates such as LiCIO, LiBrO, and LilO can be used.
- organic sulfonates such as LiCF SO, LiN (CF SO), LiN (CF
- LiN LiN (CF SO) (C F SO) and other perfluoroalkyl sulfonic acid imide salts, Li
- Perfluoroalkylsulfonic acid methide salts such as C (CF SO), LiPF (CF), LiPF
- fluorine-containing organic lithium salts such as inorganic fluoride salts in which a part of fluorine atoms such as LiB (CF), LiBF (CF), LiBF (CF), LiBF (CF), etc. are partially substituted with perfluoroalkyl groups
- LiB (CF), LiBF (CF), LiBF (CF), LiBF (CF), etc. are partially substituted with perfluoroalkyl groups
- LiN (CF SO) (C F SO), LiPF (CF), LiPF (C F), or LiBF (C F) is preferably used.
- LiBF or LiPF when used as the lithium salt, an excellent nonaqueous electrolytic solution having high electrochemical stability and high electrical conductivity in a wide temperature range with high electrochemical stability can be obtained.
- LiBF and LiPF power mol% or more preferably 30 mol% or more are contained in the total lithium salt in the non-aqueous electrolyte. I want to be done.
- the concentration of the lithium salt in the non-aqueous electrolyte is too low, the electrical conductivity in the non-aqueous electrolyte deteriorates. On the other hand, if the concentration is too high, the viscosity increases and the electrical conductivity decreases. In addition, since lithium salt may precipitate at low temperatures and battery performance may deteriorate, the lithium salt concentration in the non-aqueous electrolyte should be in the range of 0.5 to 3 mol / liter. Is preferred.
- additives such as known overcharge inhibitors, dehydrating agents, deoxidizing agents, etc. may be added to the non-aqueous electrolyte.
- the amount of these additives becomes too large, the battery performance will be adversely affected by the decomposition, so it is necessary to appropriately set the amount of addition of these additives.
- the shape and structure of the nonaqueous electrolyte secondary battery in the present invention are not particularly limited.
- a separator is interposed between the positive electrode and the negative electrode formed in a sheet shape.
- a cylindrical nonaqueous electrolyte secondary battery a coin type nonaqueous electrolyte secondary battery in which a separator is interposed between a positive electrode and a negative electrode formed into a pellet shape. Good.
- separator a commonly used separator can be used, and it is preferable to use a separator made of a material that is stable with respect to the non-aqueous electrolyte and has excellent liquid retention.
- a porous sheet made of polyolefin such as polyethylene and polypropylene.
- non-aqueous electrolyte secondary battery according to the example of the present invention will be specifically described, and the non-aqueous electrolyte secondary battery in this example will be compared with the improvement in cycle characteristics. Clarify with an example.
- the non-aqueous electrolyte secondary battery according to the present invention is not limited to those shown in the following examples, and can be implemented with appropriate modifications without departing from the scope of the invention.
- Example 1 a negative electrode and a positive electrode were prepared as follows, and a non-aqueous electrolyte was prepared as follows, and a flat coin-type non-aqueous electrolyte secondary solution as shown in FIG. 1 was prepared. A battery was made.
- the sputtering gas (Ar) flow rate 100 sccm
- substrate temperature room temperature (no heating)
- reaction pressure 0. 133Pa (l 0 X 10- 3 Torr)
- RF power 200 W RF sputtering was performed under the conditions described above, and a negative electrode active material thin film consisting of a silicon thin film with a thickness of about 5 ⁇ m was formed.
- the negative electrode active material thin film formed of the amorphous silicon thin film thus formed on the negative electrode current collector was observed with a scanning electron microscope (SEM).
- SEM scanning electron microscope
- the schematic diagram shown in FIG. 2 was obtained.
- the thin film of the negative electrode active material 2a was separated into a columnar shape by the cut 2c formed in the thickness direction so as to correspond to the unevenness of the negative electrode current collector 2b.
- a negative electrode current collector made of an electrolytic copper foil on which a thin film of a negative electrode active material having an amorphous silicon thin film force as described above was vacuum-dried at 100 ° C for 2 hours.
- a negative electrode was produced by punching into a disk shape having a diameter of 10.0 mm.
- lithium-containing cobalt dioxide LiCo O powder manufactured by Nippon Chemical Industry Co., Ltd .: C5 was used as the positive electrode active material, and carbon black (Denka Black, manufactured by Denki Kagaku Kogyo Co., Ltd.) 6 parts by weight, polyvinylidene fluoride (Kureha Chemical Co., Ltd .: KF-1000) is added at a ratio of 9 parts by weight, and N-methyl _ 2_ pyrrolidone is added to form a slurry.
- On the current collector aluminum foil with a thickness of 20 am apply evenly to about 90% of the theoretical capacity of the negative electrode, and dry it at 100 ° C for 12 hours. Thereafter, this was punched into a disk shape having a diameter of 10.0 mm to produce a positive electrode.
- a non-aqueous electrolyte 1 mol Z of lithium hexafluorophosphate LiPF as a solute was added to a solvent in which ethylene carbonate and ethyl carbonate, a non-aqueous solvent, were mixed at a volume ratio of 3: 7.
- a non-aqueous electrolyte solution is prepared by dissolving to 1 liter, and the fluoroethylene power of the compound represented by the above general formula (I) is further reduced against this non-aqueous electrolyte solution. 2% by weight of boronate was added. In this case, the mass of the full O b ethylene carbonate to the weight of the non-aqueous electrolyte excluding lithium salt becomes 2.2 mass 0/0.
- a separator 3 made of a polypropylene microporous film is interposed between the positive electrode 1 and the negative electrode 2 produced as described above. And impregnated with a non-aqueous electrolyte solution, and accommodated in a battery can 4 comprising a stainless steel positive electrode can 4a and a negative electrode can 4b, and the positive electrode 1 was connected to the positive electrode can 4a via the positive electrode current collector lb.
- the negative electrode 2 is connected to the negative electrode can 4b via the negative electrode current collector 2b, and the battery can 4 is caulked by disposing the insulating packing 5 between the positive electrode can 4a and the negative electrode can 4b.
- a non-aqueous electrolyte secondary battery having a design capacity of 3.4 mAh was fabricated by electrically insulating and sealing between the positive electrode can 4a and the negative electrode can 4b.
- Example 2 only the nonaqueous electrolyte used was changed from that in Example 1 above, and a nonaqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that. .
- Example 2 in the preparation of the nonaqueous electrolytic solution in Example 1 above, instead of the above fluoroethylene carbonate, the compound represented by the above general formula (I) is used. 2 mass% of fluoromethyl methyl carbonate was added.
- Example 3 the nonaqueous electrolyte secondary battery was manufactured in the same manner as in Example 1 except that only the nonaqueous electrolyte used was changed from that in Example 1 above. .
- Example 3 in the preparation of the nonaqueous electrolytic solution in Example 1 above, instead of the above fluoroethylene carbonate, the compound represented by the above general formula (I) is used. 2_Fluoroethyl methyl carbonate was added in an amount of 2% by mass.
- Example 4 the nonaqueous electrolyte secondary battery was fabricated in the same manner as in Example 1 except that only the nonaqueous electrolyte used was changed from that in Example 1 above. .
- Example 4 in the preparation of the non-aqueous electrolyte in Example 1 above, instead of the above fluoroethylene carbonate, the compound represented by the above general formula (I): Thus, 2% by mass of ethyl_2_fluoroethyl carbonate was added.
- Example 5 the nonaqueous electrolyte secondary battery was manufactured in the same manner as in Example 1 except that only the nonaqueous electrolyte used was changed from the case of Example 1 above. .
- Example 5 in the preparation of the non-aqueous electrolyte in Example 1 above, instead of the above fluoroethylene carbonate, the compound represented by the general formula (I) was used. 2% by mass of bis (2-fluoroethyl) carbonate was added.
- Example 6 only the nonaqueous electrolyte used was changed from that in Example 1 above, and a nonaqueous electrolyte secondary battery was produced in the same manner as in Example 1 except that. .
- Example 6 in the preparation of the non-aqueous electrolyte in Example 1 above, instead of the above fluoroethylene carbonate, the compound represented by the above general formula (I) is used. 2% by mass of ethyl 2,2,2-trifluoroethyl carbonate was added.
- Example 7 the nonaqueous electrolyte secondary battery was fabricated in the same manner as in Example 1 except that only the nonaqueous electrolyte used was changed from that in Example 1 above. .
- Example 7 in the preparation of the non-aqueous electrolyte in Example 1 above, instead of the above fluoroethylene carbonate, the compound represented by the general formula (I) was used. 2% by mass of bis (2, 2, 2_trifluoroethyl) carbonate was added.
- Example 8 the nonaqueous electrolyte secondary battery was manufactured in the same manner as in Example 1 except that only the nonaqueous electrolyte used was changed from that in Example 1 above. .
- Example 8 in the preparation of the nonaqueous electrolytic solution in Example 1 above, instead of the above fluoroethylene carbonate, the compound represented by the general formula (I) was used. Add 2% by mass of trifluoromethyl-1,3-dioxolane1-2_one. [Example 9]
- Example 9 the nonaqueous electrolyte secondary battery was fabricated in the same manner as in Example 1 except that only the nonaqueous electrolyte used was changed from that in Example 1 above. .
- Example 9 in the preparation of the non-aqueous electrolyte in Example 1 above, 2% by mass of the above fluoroethylene carbonate was added, and vinylene carbonate to which no fluorine was bonded was added. The mass% was added.
- Example 10 Even in Example 10, only the non-aqueous electrolyte used is changed from that in Example 1 above.
- a non-aqueous electrolyte secondary battery was fabricated in the same manner as in Example 1 above.
- Example 10 a solvent obtained by mixing ethylene carbonate, which is a non-aqueous solvent, and fluoromethyl methyl carbonate, which is a compound represented by the above general formula (I), at a volume ratio of 3: 7.
- a non-aqueous electrolyte prepared by dissolving lithium hexafluorophosphate LiPF as a solute at 1 mol / liter was used.
- the mass of fluoromethyl methyl carbonate with respect to the mass of the non-aqueous electrolyte excluding the lithium salt is 68.8% by mass.
- Example 11 the nonaqueous electrolyte secondary battery was fabricated in the same manner as in Example 1 except that only the nonaqueous electrolyte used was changed from that in Example 1 above. .
- Example 11 ethylene carbonate as a non-aqueous solvent and 2_fluoroethylmethyl carbonate as a compound represented by the above general formula (I) were mixed at a volume ratio of 3: 7.
- a non-aqueous electrolyte prepared by dissolving lithium hexafluorophosphate LiPF as a solute at 1 mol / liter in the solvent was used.
- the mass of 2_fluoroethylmethyl carbonate with respect to the mass of the non-aqueous electrolyte excluding the lithium salt is 67.9 mass%.
- Example 12 only the non-aqueous electrolyte used is changed from that in Example 1 above.
- a non-aqueous electrolyte secondary battery was fabricated in the same manner as in Example 1 above.
- Example 12 the non-aqueous solvent ethylene carbonate and the general formula (I) 1 mol of lithium hexafluorophosphate LiPF as a solute in a solvent in which the compound represented by ethyl _ 2_ fluorethyl carbonate was mixed at a volume ratio of 3: 7
- a non-aqueous electrolyte prepared by dissolving to 6 Z liters was used.
- the mass of ethyl_2-fluoroethyl carbonate with respect to the mass of the non-aqueous electrolyte excluding the lithium salt is 66.6% by mass.
- Example 13 the nonaqueous electrolyte secondary battery was fabricated in the same manner as in Example 1 except that only the nonaqueous electrolyte used was changed from that in Example 1 above. .
- Example 13 ethylene carbonate and jetyl carbonate which are non-aqueous solvents and ethyl 2-fluoroethyl carbonate which is a compound represented by the above general formula (I) are mixed with 3: Use a non-aqueous electrolyte prepared by dissolving lithium hexafluorophosphate LiPF as a solute in a solvent mixed at a volume ratio of 3.5: 3.5 to 1 mol / liter.
- Example 14 only the nonaqueous electrolyte used is changed from that in Example 1 above.
- a non-aqueous electrolyte secondary battery was fabricated in the same manner as in Example 1 above.
- Example 14 ethylene carbonate as a non-aqueous solvent and 2_fluoroethylmethyl carbonate as a compound represented by the above general formula (I) were mixed at a volume ratio of 3: 7. To the solvent, 1 mol / liter of lithium hexafluorophosphate LiPF as solute
- Example 15 the nonaqueous electrolyte secondary battery was manufactured in the same manner as in Example 1 except that only the nonaqueous electrolyte used was changed from that in Example 1 above. .
- ethylene carbonate as a non-aqueous solvent and 2_fluoroethylmethyl carbonate as a compound represented by the above general formula (I) were mixed at a volume ratio of 3: 7.
- a nonaqueous electrolytic solution was prepared by dissolution, and 2% by mass of vinylene carbonate to which no fluorine was bonded was added to the nonaqueous electrolytic solution.
- the mass of 2-fluoroethyl methyl carbonate is 66.5% by mass and the mass of vinylene carbonate is 2.2% by mass with respect to the mass of the non-aqueous electrolyte excluding the lithium salt.
- Example 1 Also in Comparative Example 1, a non-aqueous electrolyte secondary battery was fabricated in the same manner as in Example 1 except that only the non-aqueous electrolyte used was changed from that in Example 1 above. .
- a non-aqueous electrolyte was prepared by dissolving at 6 mol / liter.
- Example 2 the nonaqueous electrolyte secondary battery was fabricated in the same manner as in Example 1 except that only the nonaqueous electrolyte used was changed from that in Example 1 above. .
- a nonaqueous electrolytic solution was prepared by dissolving to 6 mol Z liter, and 2% by mass of vinylene carbonate not bonded with fluorine was added to the nonaqueous electrolytic solution.
- the mass of vinylene carbonate with respect to the mass of the non-aqueous electrolyte excluding the lithium salt is 2.2% by mass.
- the non-aqueous electrolyte secondary batteries of Examples 1 to 15 and Comparative Examples 1 and 2 prepared as described above were charged at a temperature of 25 ° C, respectively, with a charging current of 1.2 mA.
- the battery is charged to 4.2V with a constant voltage of 4.2V until the charging current reaches 0.12mA, and then discharged with a discharge current of 1.2mA until the discharge end voltage is 2.5V.
- FIG. 1 is a schematic diagram showing the state of negative electrodes used in Examples:! To 14 and Comparative Examples 1 and 2 of the present invention.
- FIG. 2 is a schematic cross-sectional view of a non-aqueous electrolyte secondary battery manufactured in Examples 1 to 14 and Comparative Examples 1 and 2 of the present invention.
Abstract
Description
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US11/570,454 US20070178379A1 (en) | 2004-09-17 | 2005-09-08 | Non-aqueous electrolyte secondary battery and non-aqueous electrolyte |
KR1020077002888A KR101272434B1 (ko) | 2004-09-17 | 2005-09-08 | 비수 전해액 이차전지 및 비수 전해액 |
EP05782093A EP1806806A4 (en) | 2004-09-17 | 2005-09-08 | NONAQUEOUS ELECTROLYTIC SECONDARY BATTERY AND NONAQUEOUS ELECTROLYTE |
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Also Published As
Publication number | Publication date |
---|---|
EP1806806A4 (en) | 2011-05-18 |
US20070178379A1 (en) | 2007-08-02 |
CN1981406A (zh) | 2007-06-13 |
JP4921702B2 (ja) | 2012-04-25 |
KR20070054629A (ko) | 2007-05-29 |
JP2006086058A (ja) | 2006-03-30 |
CN100499244C (zh) | 2009-06-10 |
EP1806806A1 (en) | 2007-07-11 |
KR101272434B1 (ko) | 2013-06-07 |
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