WO2012073853A1 - リチウムイオン電池電極用バインダー、リチウムイオン電池負極用ペーストおよびリチウムイオン電池負極の製造方法 - Google Patents
リチウムイオン電池電極用バインダー、リチウムイオン電池負極用ペーストおよびリチウムイオン電池負極の製造方法 Download PDFInfo
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- WO2012073853A1 WO2012073853A1 PCT/JP2011/077308 JP2011077308W WO2012073853A1 WO 2012073853 A1 WO2012073853 A1 WO 2012073853A1 JP 2011077308 W JP2011077308 W JP 2011077308W WO 2012073853 A1 WO2012073853 A1 WO 2012073853A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- group
- lithium ion
- residue
- carbon atoms
- negative electrode
- Prior art date
Links
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 45
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 239000011230 binding agent Substances 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 229920001721 polyimide Polymers 0.000 claims abstract description 56
- 239000004642 Polyimide Substances 0.000 claims abstract description 53
- 125000004427 diamine group Chemical group 0.000 claims abstract description 27
- 239000002243 precursor Substances 0.000 claims abstract description 27
- 150000004985 diamines Chemical class 0.000 claims abstract description 22
- 239000002253 acid Substances 0.000 claims abstract description 19
- 150000000000 tetracarboxylic acids Chemical group 0.000 claims abstract description 19
- 125000004432 carbon atom Chemical group C* 0.000 claims description 21
- 239000007773 negative electrode material Substances 0.000 claims description 21
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 19
- GTDPSWPPOUPBNX-UHFFFAOYSA-N ac1mqpva Chemical compound CC12C(=O)OC(=O)C1(C)C1(C)C2(C)C(=O)OC1=O GTDPSWPPOUPBNX-UHFFFAOYSA-N 0.000 claims description 17
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical group [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 13
- 239000002003 electrode paste Substances 0.000 claims description 13
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical group [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 10
- 229910052710 silicon Inorganic materials 0.000 claims description 10
- 125000000217 alkyl group Chemical group 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 8
- 229910052718 tin Inorganic materials 0.000 claims description 8
- 239000011888 foil Substances 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 125000004429 atom Chemical group 0.000 claims description 5
- 125000003545 alkoxy group Chemical group 0.000 claims description 4
- 125000003709 fluoroalkyl group Chemical group 0.000 claims description 4
- 229910052732 germanium Inorganic materials 0.000 claims description 4
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 4
- 125000002947 alkylene group Chemical group 0.000 claims description 3
- 125000003368 amide group Chemical group 0.000 claims description 3
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 claims description 3
- 125000002993 cycloalkylene group Chemical group 0.000 claims description 3
- 125000004185 ester group Chemical group 0.000 claims description 3
- 125000001033 ether group Chemical group 0.000 claims description 3
- 125000000472 sulfonyl group Chemical group *S(*)(=O)=O 0.000 claims description 3
- 125000000101 thioether group Chemical group 0.000 claims description 3
- 150000008064 anhydrides Chemical group 0.000 claims 1
- -1 tetracarboxylic acid dianhydride Chemical class 0.000 abstract description 22
- 239000004952 Polyamide Substances 0.000 abstract description 2
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- 125000006158 tetracarboxylic acid group Chemical group 0.000 description 11
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- 239000010703 silicon Substances 0.000 description 9
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- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 6
- WKDNYTOXBCRNPV-UHFFFAOYSA-N bpda Chemical compound C1=C2C(=O)OC(=O)C2=CC(C=2C=C3C(=O)OC(C3=CC=2)=O)=C1 WKDNYTOXBCRNPV-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- FCSSPCOFDUKHPV-UHFFFAOYSA-N 2-Propenyl propyl disulfide Chemical compound CCCSSCC=C FCSSPCOFDUKHPV-UHFFFAOYSA-N 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
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- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 5
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- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
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- 239000002033 PVDF binder Substances 0.000 description 4
- 239000004962 Polyamide-imide Substances 0.000 description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 125000003277 amino group Chemical group 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 239000011889 copper foil Substances 0.000 description 4
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229920002312 polyamide-imide Polymers 0.000 description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 4
- FYSNRJHAOHDILO-UHFFFAOYSA-N thionyl chloride Chemical compound ClS(Cl)=O FYSNRJHAOHDILO-UHFFFAOYSA-N 0.000 description 4
- QAEDZJGFFMLHHQ-UHFFFAOYSA-N trifluoroacetic anhydride Chemical compound FC(F)(F)C(=O)OC(=O)C(F)(F)F QAEDZJGFFMLHHQ-UHFFFAOYSA-N 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 3
- 229910000676 Si alloy Inorganic materials 0.000 description 3
- 239000006087 Silane Coupling Agent Substances 0.000 description 3
- 125000003118 aryl group Chemical group 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 150000005690 diesters Chemical class 0.000 description 3
- 230000032050 esterification Effects 0.000 description 3
- 238000005886 esterification reaction Methods 0.000 description 3
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000003495 polar organic solvent Substances 0.000 description 3
- 239000009719 polyimide resin Substances 0.000 description 3
- WGYKZJWCGVVSQN-UHFFFAOYSA-N propylamine Chemical group CCCN WGYKZJWCGVVSQN-UHFFFAOYSA-N 0.000 description 3
- 229920003048 styrene butadiene rubber Polymers 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- 239000004034 viscosity adjusting agent Substances 0.000 description 3
- SXGMVGOVILIERA-UHFFFAOYSA-N (2R,3S)-2,3-diaminobutanoic acid Natural products CC(N)C(N)C(O)=O SXGMVGOVILIERA-UHFFFAOYSA-N 0.000 description 2
- ZZXUZKXVROWEIF-UHFFFAOYSA-N 1,2-butylene carbonate Chemical compound CCC1COC(=O)O1 ZZXUZKXVROWEIF-UHFFFAOYSA-N 0.000 description 2
- GPXCORHXFPYJEH-UHFFFAOYSA-N 3-[[3-aminopropyl(dimethyl)silyl]oxy-dimethylsilyl]propan-1-amine Chemical compound NCCC[Si](C)(C)O[Si](C)(C)CCCN GPXCORHXFPYJEH-UHFFFAOYSA-N 0.000 description 2
- HLBLWEWZXPIGSM-UHFFFAOYSA-N 4-Aminophenyl ether Chemical compound C1=CC(N)=CC=C1OC1=CC=C(N)C=C1 HLBLWEWZXPIGSM-UHFFFAOYSA-N 0.000 description 2
- VQVIHDPBMFABCQ-UHFFFAOYSA-N 5-(1,3-dioxo-2-benzofuran-5-carbonyl)-2-benzofuran-1,3-dione Chemical compound C1=C2C(=O)OC(=O)C2=CC(C(C=2C=C3C(=O)OC(=O)C3=CC=2)=O)=C1 VQVIHDPBMFABCQ-UHFFFAOYSA-N 0.000 description 2
- JVERADGGGBYHNP-UHFFFAOYSA-N 5-phenylbenzene-1,2,3,4-tetracarboxylic acid Chemical compound OC(=O)C1=C(C(O)=O)C(C(=O)O)=CC(C=2C=CC=CC=2)=C1C(O)=O JVERADGGGBYHNP-UHFFFAOYSA-N 0.000 description 2
- OZJPLYNZGCXSJM-UHFFFAOYSA-N 5-valerolactone Chemical compound O=C1CCCCO1 OZJPLYNZGCXSJM-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
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- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 2
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- 229910000927 Ge alloy Inorganic materials 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 125000002777 acetyl group Chemical class [H]C([H])([H])C(*)=O 0.000 description 2
- 150000008065 acid anhydrides Chemical class 0.000 description 2
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- 229910052782 aluminium Inorganic materials 0.000 description 2
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- 150000001408 amides Chemical class 0.000 description 2
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 2
- QMKYBPDZANOJGF-UHFFFAOYSA-N benzene-1,3,5-tricarboxylic acid Chemical compound OC(=O)C1=CC(C(O)=O)=CC(C(O)=O)=C1 QMKYBPDZANOJGF-UHFFFAOYSA-N 0.000 description 2
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 2
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 125000001142 dicarboxylic acid group Chemical group 0.000 description 2
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Chemical compound C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 description 2
- KZTYYGOKRVBIMI-UHFFFAOYSA-N diphenyl sulfone Chemical compound C=1C=CC=CC=1S(=O)(=O)C1=CC=CC=C1 KZTYYGOKRVBIMI-UHFFFAOYSA-N 0.000 description 2
- VUPKGFBOKBGHFZ-UHFFFAOYSA-N dipropyl carbonate Chemical compound CCCOC(=O)OCCC VUPKGFBOKBGHFZ-UHFFFAOYSA-N 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- LZCLXQDLBQLTDK-UHFFFAOYSA-N ethyl 2-hydroxypropanoate Chemical compound CCOC(=O)C(C)O LZCLXQDLBQLTDK-UHFFFAOYSA-N 0.000 description 2
- FKRCODPIKNYEAC-UHFFFAOYSA-N ethyl propionate Chemical compound CCOC(=O)CC FKRCODPIKNYEAC-UHFFFAOYSA-N 0.000 description 2
- CYEDOLFRAIXARV-UHFFFAOYSA-N ethyl propyl carbonate Chemical compound CCCOC(=O)OCC CYEDOLFRAIXARV-UHFFFAOYSA-N 0.000 description 2
- 238000004817 gas chromatography Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
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- 238000004898 kneading Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- KKQAVHGECIBFRQ-UHFFFAOYSA-N methyl propyl carbonate Chemical compound CCCOC(=O)OC KKQAVHGECIBFRQ-UHFFFAOYSA-N 0.000 description 2
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- 150000005041 phenanthrolines Chemical class 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
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- ARCGXLSVLAOJQL-UHFFFAOYSA-N trimellitic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C(C(O)=O)=C1 ARCGXLSVLAOJQL-UHFFFAOYSA-N 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
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- URNDYGXBVYULJU-UHFFFAOYSA-N 1,2-diaminoethane-1,2-diol Chemical compound NC(O)C(N)O URNDYGXBVYULJU-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- 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
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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
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- H01M4/02—Electrodes composed of, or comprising, active material
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- H01M4/139—Processes of manufacture
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- 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
- H01M4/1395—Processes of manufacture of electrodes based on metals, Si or alloys
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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
- H01M4/36—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
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- 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
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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
- H01M4/36—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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present invention relates to a binder for a lithium ion battery electrode, a paste for a lithium ion battery negative electrode using the binder, and a method for producing a lithium ion battery negative electrode.
- the lithium-ion battery is a high-capacity battery that can be charged. Furthermore, it is mounted on automobiles and is regarded as a promising battery for hybrid vehicles and electric vehicles.
- Lithium ion batteries that are widely used at present are a positive electrode formed by applying an active material such as lithium cobaltate and a paste containing a binder such as polyvinylidene fluoride (PVDF) on an aluminum foil, and a carbon-based active material.
- PVDF polyvinylidene fluoride
- a negative electrode formed by applying a paste containing a binder such as PVDF or styrene-butadiene rubber (SBR) on a copper foil.
- An object of the present invention is to provide a binder for a lithium ion battery electrode that exhibits high initial efficiency.
- the present invention is a polyimide precursor containing a tetracarboxylic acid residue and a diamine residue and / or a binder containing a polyimide, and is selected from the following general formulas (1) and (2) as a tetracarboxylic acid residue.
- a residue of tetracarboxylic dianhydride, a residue of a diamine selected from the following general formulas (3) and (4) as a diamine residue, and an acid residue per mole of the diamine residue Is a binder for a lithium ion battery electrode having 0.90 to 0.95 mol.
- R 1 to R 6 may be single or different, and may be a mixture of an alkyl group having 1 to 4 carbon atoms, 1 to 4 represents a group selected from a fluoroalkyl group having 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a phenyl group, and a phenyl group in which at least one of hydrogen atoms is substituted with an alkyl group having 1 to 10 carbon atoms; Selected from a bond, an alkylene group having 1 to 10 carbon atoms, a fluoroalkylene group, a cycloalkylene group having 4 to 10 carbon atoms, a fluorocycloalkylene group, a carbonyl group, an ester group, an amide group, a sulfide group, an ether group, and a sulfonyl group.
- N is an integer from 0 to 2; m and o are each an integer from 0 to 3;
- the present invention also includes a lithium ion battery negative electrode paste containing the above lithium ion battery electrode binder and a lithium ion battery negative electrode active material containing one or more atoms selected from silicon atoms, tin atoms, and germanium atoms.
- the present invention also includes a method for producing a lithium ion battery negative electrode, in which the above-mentioned paste for lithium ion battery negative electrode is applied on a metal foil to a thickness of 1 to 100 ⁇ m and heat-treated at 100 to 500 ° C. for 1 minute to 24 hours.
- the initial efficiency of the lithium ion battery can be improved.
- a negative electrode active material containing one or more atoms selected from silicon atoms, tin atoms, and germanium atoms is used, high initial efficiency can be obtained.
- the lithium ion battery electrode binder of the present invention (hereinafter sometimes referred to as a binder) is a polyimide precursor and / or a polyimide containing a tetracarboxylic acid residue and a diamine residue.
- a polyimide is a polymer having a tetracarboxylic acid residue and a diamine residue, which is obtained by ring-closing a polyimide precursor described later by heat treatment or chemical treatment.
- Polyamideimide containing an amide bond in a part of the main chain of polyimide can also be preferably used.
- the polyimide precursor refers to a resin that can be converted into polyimide by heat treatment or chemical treatment.
- the polyimide precursor include polyamic acid, polyamic acid ester, polyisoimide, and the like.
- Polyamic acid is obtained by polymerizing tetracarboxylic dianhydride and diamine, and is a polymer having a tetracarboxylic acid residue and a diamine residue.
- the polyamic acid ester is a polymer having a dicarboxylic acid diester residue and a diamine residue, obtained by polymerizing a dicarboxylic acid diester and a diamine, or by reacting an esterification reagent with a carboxyl group of the polyamic acid.
- esterification reagent examples include acetal compounds such as dimethylformamide dialkyl acetal, dihydropyran, alkyl halide, vinyl ether and the like.
- a polyisoimide is a polymer having a diisoimide residue and a diamine residue, which is obtained by dehydrating and ring-closing polyamic acid with dicyclohexylcarbodiimide, trifluoroacetic anhydride, or the like.
- the tetracarboxylic dianhydride used for the production of the polyimide precursor used in the present invention is selected from the tetracarboxylic dianhydrides represented by the general formulas (1) and (2).
- examples of such include pyromellitic anhydride and biphenyltetracarboxylic dianhydride.
- the tetracarboxylic dianhydride represented by the general formula (2) is particularly preferable.
- Specific examples include biphenyltetracarboxylic dianhydride.
- tetracarboxylic dianhydrides include benzophenone tetracarboxylic dianhydride, diphenyl ether tetracarboxylic dianhydride, diphenylsulfone tetracarboxylic dianhydride, hexafluoropropylidenebis (phthalic anhydride), etc. Also good.
- aliphatic tetracarboxylic acids such as cyclobutanetetracarboxylic dianhydride, butanetetracarboxylic dianhydride, cyclopentanetetracarboxylic dianhydride, cyclohexanetetracarboxylic dianhydride, naphthalenetetracarboxylic dianhydride
- a dianhydride can also be used.
- dicarboxylic acid diesters or tetracarboxylic acids having the same basic skeleton can be used in place of these tetracarboxylic dianhydrides.
- the component derived from tetracarboxylic dianhydride, dicarboxylic acid diester or tetracarboxylic acid constitutes a tetracarboxylic acid residue of polyamic acid, a dicarboxylic acid diester residue of polyamic acid ester, and a diisoimide residue of polyisoimide, respectively.
- a tetracarboxylic dianhydride residue, a tetracarboxylic acid residue, a dicarboxylic acid diester residue, and a diisoimide residue are collectively referred to as a specific acid residue.
- polyimide or polyimide precursor is a residue of tricarboxylic acid such as trimellitic acid or trimesic acid, phthalic acid, naphthalenedicarboxylic acid, adipic acid, hexamethylenedicarboxylic acid, cyclohexanedicarboxylic acid. It may also contain dicarboxylic acid residues such as The content of residues other than these specific acid residues in the polyimide or polyimide precursor is preferably 50 mol or less with respect to 100 mol of the specific acid residue.
- the diamine used for the production of the polyimide precursor used in the present invention is selected from the diamines represented by the general formulas (3) and (4).
- Examples of such a diamine include phenylenediamine having one aromatic ring, diaminotoluene, diaminoxylene, diaminoethylbenzene, diaminodiphenylmethane having two aromatic rings, diaminodiphenyl ether, diaminodiphenyl sulfide, Diaminodiphenylsulfone, benzidine, diaminobenzanilide, 2,2-bis (4-aminophenyl) hexafluoropropane, 1,4-bis [1- (4-aminophenyl) -1-methyl having three aromatic rings Ethyl] benzene, bis (aminophenoxy) benzene, bis (aminophenoxyphenyl) sulfone having four aromatic rings, bis (aminophenoxyphenyl)
- Aliphatic diamines such as cyclopentyl diamine and cyclohexyl diamine may also be used.
- an amino group is generated at the terminal of the polyimide and the polyimide precursor when the acid residue is 0.90 to 0.95 mol per 1 mol of the diamine residue. Since this amino group behaves cationically, it becomes difficult to attract Li ions to the binder, and the initial efficiency is improved and the charge / discharge cycle characteristics are also improved.
- the acid dianhydride residue is smaller than 0.90 mol with respect to 1 mol of the diamine residue, the chemical resistance and mechanical properties of the polyimide and the polyimide precursor with respect to the electrolytic solution and the base are deteriorated. When the mechanical strength decreases, the film may be destroyed by stress due to the volume change of the active material, and the active material may be peeled off.
- the concentration of the amino group at the terminal is lowered, and the effect of improving the initial efficiency is weak. Furthermore, when the tetracarboxylic dianhydride residue is larger than 1.0 mol with respect to 1 mol of the diamine residue, an acid remains at the end of the polyimide, and lithium ions are easily trapped, and the initial efficiency is reduced.
- the acid residue is 0.91 to 0.95 mol per mol of the diamine residue, more preferably 0.91 to 0.945 mol of acid residue per mol of the diamine residue, Preferably, the acid residue is 0.91 to 0.94 mol per mol of the diamine residue.
- the content of the tetracarboxylic acid residue and the diamine residue contained in the binder can be calculated from the charged amounts of the tetracarboxylic acid anhydride and the diamine used for the production of the polyimide or polyimide precursor.
- the following method can be used as a method of measuring the content of the tetracarboxylic acid residue and the content of the diamine residue from the obtained polyimide or polyimide precursor.
- a polyimide or a polyimide precursor is hydrolyzed by heat treatment at a temperature of 100 to 300 ° C. in an aqueous tetramethylammonium hydroxide solution.
- the number average molecular weight of the polyimide and the polyimide precursor can be calculated from the amount of tetracarboxylic anhydride and diamine used for the production of the polyimide or polyimide precursor.
- the number average degree of polymerization is determined by the amount charged, and the number average molecular weight can be calculated by multiplying this by one unit of molecular weight.
- the number average degree of polymerization calculated from a ratio of 0.90 to 0.95 moles of tetracarboxylic anhydride per mole of diamine is in the range of 10 to 20.
- NMP N-methylpyrrolidone
- the binder of the present invention contains the polyimide and / or polyimide precursor. Only 1 type of these may be contained and 2 or more types may be contained. In addition to these resins, a resin that decomposes at a relatively low temperature, such as SBR, polyethylene glycol, and polypropylene glycol, may be further contained. In an electrode manufacturing method to be described later, an electrode having pores inside can be obtained by decomposing such a low-temperature decomposition resin by heat treatment. The ratio of the total amount of the polyimide and polyimide precursor to the low-temperature decomposition resin is preferably in the range of 100: 1 to 50:50 by weight.
- the binder of the present invention may further contain a surfactant, a viscosity modifier and the like as necessary.
- the viscosity modifier include carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose and the like.
- silane coupling agents such as aminopropyltrimethoxysilane, trimethoxyvinylsilane, trimethoxyglycidoxysilane, triazine compounds, phenanthroline compounds, triazole compounds, etc. are added to 100 parts by weight of the total amount of polyimide and polyimide precursor. It may be contained in an amount of 0.1 to 10 parts by weight. By containing these, adhesiveness with an active material and metal foil can further be improved.
- the manufacturing method of the binder of this invention is demonstrated.
- the diamine is added to a solvent such as N-methylpyrrolidone (NMP), N, N-dimethylformamide (DMF), N, N-dimethylacetamide (DMAC), gamma butyrolactone (GBL), dimethyl sulfoxide (DMSO), etc.
- NMP N-methylpyrrolidone
- DMF N, N-dimethylformamide
- DMAC N-dimethylacetamide
- GBL gamma butyrolactone
- DMSO dimethyl sulfoxide
- a general method is to dissolve and add tetracarboxylic dianhydride to react.
- the reaction temperature is generally ⁇ 20 ° C. to 100 ° C., preferably 0 ° C. to 50 ° C.
- the reaction time is generally 1 minute to 100 hours, preferably 2 hours to 24 hours. It is preferable to prevent moisture from entering the system by flowing nitrogen during the reaction.
- tetracarboxylic dianhydride is mixed with alcohol such as ethanol, propanol and butanol and a base catalyst such as pyridine and triethylamine, and reacted at room temperature to 100 ° C. for several minutes to 10 hours to obtain dicarboxylic acid diester. A compound is obtained.
- the tetracarboxylic dianhydride may be mixed directly with the alcohol, or the tetracarboxylic dianhydride is dissolved in a solvent such as NMP, DMAC, DMF, DMSO, GBL, and then the alcohol and the base catalyst are mixed. May be.
- the obtained dicarboxylic acid diester is subjected to heat treatment in thionyl chloride or oxalodichloride is allowed to act to obtain dicarboxylic acid chloride diester.
- the obtained dicarboxylic acid chloride diester is recovered by a technique such as distillation and added dropwise to a solution in which diamine is dissolved in a solvent such as NMP, DMAC, DMF, DMSO, GBL in the presence of pyridine or triethylamine.
- the dropping is preferably performed at -20 ° C to 30 ° C. After completion of dropping, the reaction is carried out at ⁇ 20 ° C. to 50 ° C. for 1 to 100 hours to obtain a polyamic acid ester.
- hydrochloride can be formed as a by-product, so that dicarboxylic acid diester can be condensed with peptides such as dicyclohexylcarbodiimide instead of heat treatment in thionyl chloride or oxalodichloride. It is preferable to react with diamine with a reagent.
- the polyamic acid ester can also be obtained by reacting the polyamic acid described above with an acetal compound such as dimethylformamide dialkyl acetal. The esterification rate can be adjusted by the amount of the acetal compound added.
- polyisoimide in the case of polyisoimide, polyisoimide can be obtained by dehydrating and ring-closing polyamic acid with dicyclocarbodiimide, trifluoroacetic anhydride, or the like.
- a polyimide in the case of polyimide, can be obtained by ring-closing a polyimide precursor selected from the above polyamic acid, polyamic acid ester and polyisoimide by heat treatment or chemical treatment.
- the chemical treatment include treatment with acetic anhydride and pyridine, base treatment with triethylamine, dodecylundecene, etc., and acid anhydride treatment with acetic anhydride, succinic anhydride, and the like.
- reaction temperature is generally ⁇ 20 ° C. to 100 ° C., preferably 0 ° C. to 50 ° C.
- the reaction time is generally 1 minute to 100 hours, preferably 2 hours to 24 hours. It is preferable to prevent moisture from entering the system by flowing nitrogen during the reaction.
- a general reaction there is a method in which tricarboxylic acid chloride is allowed to act on a diamine solution, and then a heat treatment at 100 ° C. to 300 ° C.
- polyamideimide is performed for 1 minute to 24 hours to obtain polyamideimide.
- an acid anhydride such as acetic anhydride or a base such as triethylamine, pyridine or picoline is used as a catalyst for imidization to a polymer amount of 0.
- the reaction can be promoted by adding 1 to 10% by weight.
- polyamic acid amide is polymerized from diamine and trimellitic anhydride chloride in the presence of pyridine, triethylamine, etc., this polymer is taken out as a solid, and then the solid is heated at a temperature of 100 to 300 ° C. for 1 minute to 24 hours.
- polyamideimide can be obtained.
- the polyamide group can also be obtained by changing the amino group of the diamine compound to isocyanate and reacting with tricarboxylic acid in the presence of a tin-based catalyst in the temperature range of room temperature to 200 ° C. for 1 minute to 24 hours.
- the binder contains two or more kinds of polyimides or polyimide precursors or further contains a low-temperature decomposition resin, these may be mixed by a known method.
- the binder contains additives such as surfactants, viscosity modifiers, silane coupling agents, triazine compounds, phenanthroline compounds, triazole compounds, these additives are added to the binder and mixed. Or you may add these additives to the binder solution mentioned later.
- the binder of the present invention may be used as a solution by dissolving in a solvent.
- the range of the concentration and viscosity of the binder solution is preferably in the range of 1 mPa ⁇ sec to 1000 Pa ⁇ sec at a concentration of 1 to 50% by weight, more preferably in the range of 100 mPa ⁇ sec to 100 Pa ⁇ sec at a concentration of 5 to 30% by weight. .
- the solvent used for the binder solution examples include NMP, DMAC, DMF, DMSO, GBL, propylene glycol dimethyl ether, ethyl lactate, cyclohexanone, and tetrahydrofuran.
- a solvent such as propylene glycol monomethyl ether acetate, various alcohols, methyl ethyl ketone, methyl isobutyl ketone and the like can be preferably contained in an amount of 1 to 30% by weight in the total solvent.
- the term “binder” refers to the solid content excluding the solvent.
- the lithium ion battery negative electrode paste of the present invention (hereinafter sometimes referred to as negative electrode paste) is a lithium ion battery comprising the binder of the present invention and one or more atoms selected from silicon atoms, tin atoms and germanium atoms.
- a negative electrode active material is a lithium ion battery comprising the binder of the present invention and one or more atoms selected from silicon atoms, tin atoms and germanium atoms.
- a negative electrode active material Such a negative electrode active material has a large charge / discharge capacity per unit volume, and is useful for increasing the capacity of a battery. You may contain 2 or more types of these negative electrode active materials.
- Examples of the negative electrode active material containing a silicon atom include (1) silicon, (2) tin, nickel, copper, iron, cobalt, manganese, zinc, indium, silver, titanium, germanium, bismuth, antimony or chromium, and silicon. (3) boron, nitrogen, oxygen, or a compound of carbon and silicon, and those containing the metal exemplified in (2).
- silicon alloys or compounds include SiB 4 , SiB 6 , Mg 2 Si, Ni 2 Si, TiSi 2 , MoSi 2 , CoSi 2 , NiSi 2 , CaSi 2 , CrSi 2 , Cu 5 Si, FeSi 2 , MnSi 2 , NbSi 2 , TaSi 2 , VSi 2 , WSi 2 , ZnSi 2 , SiC, Si 3 N 4 , Si 2 N 2 O, SiO v (0 ⁇ v ⁇ 2) or LiSiO.
- Examples of the negative electrode active material containing a tin atom include (1) an alloy of silicon, nickel, copper, iron, cobalt, manganese, zinc, indium, silver, titanium, germanium, bismuth, antimony or chromium and tin, ( 2) Compounds containing oxygen or carbon and tin, and those further containing the metal exemplified in (1).
- Examples of tin alloys or compounds include SnO w (0 ⁇ w ⁇ 2), SnSiO 3 , LiSnO, Mg 2 Sn, and the like.
- Examples of the negative electrode active material containing germanium atoms include silicon, tin and germanium alloys.
- the negative electrode active material is preferably particles, and the average particle size is preferably 0.1 to 20 ⁇ m. Further, the surface of the negative electrode active material may be treated with a silane coupling agent or the like.
- the binder content is preferably 1 part by weight or more with respect to 100 parts by weight of the negative electrode active material, and the adhesiveness can be further improved.
- the content of the binder is more preferably 3 parts by weight or more, and more preferably 5 parts by weight or more.
- the binder content is preferably 20 parts by weight or less, and more preferably 15 parts by weight or less.
- the negative electrode paste of the present invention may contain conductive particles such as graphite, ketjen black, carbon nanotube, and acetylene black. These contents are preferably 0.1 parts by weight or more and 20 parts by weight or less with respect to 100 parts by weight of the negative electrode active material.
- the negative electrode paste of the present invention can be obtained by kneading the binder of the present invention, the negative electrode active material and, if necessary, additives such as a surfactant, a solvent and a crosslinking agent.
- additives such as a surfactant, a solvent and a crosslinking agent.
- a planetary mixer, three rolls, a ball mill, a homogenizer, or the like can be used. Two or more of these means may be used in combination.
- a negative electrode paste is applied on a metal foil in a thickness of 1 to 100 ⁇ m to obtain a negative electrode.
- a copper foil is generally used as the metal foil.
- methods such as screen printing, roll coating, and slit coating can be used.
- the polyimide precursor When a polyimide precursor is used as a binder, the polyimide precursor is converted into polyimide by heat treatment at 100 to 500 ° C. for 1 minute to 24 hours after coating, and a reliable negative electrode can be obtained.
- a preferred heat treatment is at 200 to 450 ° C. for 30 minutes to 20 hours.
- polyimide When polyimide is used as the binder, it is preferable to remove the solvent by heat treatment at 100 to 500 ° C. for 1 minute to 24 hours after coating. Since it is not necessary to imidize, heat treatment at 120 ° C. to 300 ° C. for 10 minutes to 24 hours is more preferable. In any case, it is preferable to heat in an inert gas such as nitrogen gas or in vacuum in order to suppress the mixing of moisture.
- a negative electrode having pores inside can be obtained by decomposing the low-temperature decomposition resin by heat treatment.
- heat treatment is preferably performed at a temperature higher than the decomposition temperature of the low-temperature decomposition resin and lower than the decomposition temperature of the binder. Specifically, heat treatment at 300 to 450 ° C. for 30 minutes to 20 hours is preferable.
- a lithium ion battery can be obtained by sandwiching a separator between a lithium ion battery positive electrode (hereinafter sometimes referred to as a positive electrode) and a negative electrode obtained according to the present invention and putting a polar organic solvent.
- the polar organic solvent serves as a medium for moving ions involved in the electrochemical reaction of the battery. Examples of the polar organic solvent include carbonate-based, ester-based, ether-based, ketone-based, alcohol-based, and non-protonic solvents.
- carbonate solvents examples include dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), methyl ethyl carbonate (MEC), ethyl methyl carbonate ( EMC), ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), and the like.
- ester solvents include methyl acetate, ethyl acetate, n-propyl acetate, methyl propionate, ethyl propionate, ⁇ -butyrolactone, tecanolide, valerolactone, mevalonolactone, caprolactone, and the like.
- ether solvents include dibutyl ether, tetraglyme, diglyme, dimethoxyethane, 2-methyltetrahydrofuran, and tetrahydrofuran.
- ketone solvents include cyclohexanone.
- alcohol solvents include ethyl alcohol and isopropyl alcohol.
- Non-protonic solvents include nitriles such as acetonitrile, amides such as dimethylformamide, dioxolanes such as 1,3-dioxolane, sulfolanes, and the like. Two or more of these solvents may be used. When mixing 2 or more types of solvent, content ratio can be suitably selected according to the performance of the target battery. For example, in the case of a carbonate-based solvent, it is preferable to use a combination of a cyclic carbonate and a chain carbonate in a volume ratio of 1: 1 to 1: 9, and the performance of the electrolytic solution can be improved.
- the lithium ion battery created as described above is charged at a constant current of 6 mA until the battery voltage reaches 4.2 V, and further charged at a constant voltage of 4.2 V until the total of 2 hours 30 minutes is reached from the start of charging. It was. Then, after resting for 30 minutes, the battery was discharged at a constant current of 6 mA until the battery voltage became 2.7 V, and charge / discharge of the first cycle was performed.
- This charge / discharge efficiency in the first cycle is called initial efficiency.
- the charge / discharge efficiency is a value obtained by dividing the discharge amount by the charge amount. Further, charging and discharging were repeated 4 times under the same conditions, and charging and discharging for a total of 5 cycles were performed. The charge / discharge efficiency at the fifth cycle is called the efficiency after the fifth cycle.
- NMP N-methyl-2-pyrrolidone (Mitsubishi Chemical Corporation)
- PDA p-phenylenediamine (manufactured by Tokyo Chemical Industry Co., Ltd.)
- DABA 4,4'-diaminobenzanilide (Wakayama Seika Kogyo Co., Ltd.)
- PMDA pyromellitic anhydride (manufactured by Daicel Corporation)
- BTDA 3,3 ′, 4,4′-benzophenone tetracarboxylic dianhydride (manufactured by Daicel Corporation)
- BPDA 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride (Mitsubishi Chemical Corporation)
- DAE 4,4'-diaminodiphenyl ether (Wakayama Seika Kogyo Co., Ltd.)
- APDS 1,3-bis (3-aminopropyl)
- Example 1 In a well-dried four-neck separable flask, 19.22 g (96.0 mmol) of DAE and 0.99 g (4.0 mmol) of APDS were dissolved in 150 g of NMP in a nitrogen atmosphere. To this, 10.03 g (46.0 mmol) of PMDA and 14.82 g (46.0 mmol) of BTDA were added together with 30.2 g of NMP, and the mixture was stirred while cooling so as not to exceed 50 ° C. Then, it stirred at 40 degreeC for 4 hours, and obtained the polyamic acid A solution (solid content concentration of 20 weight%).
- the initial efficiency was measured by the above method and found to be 74%. The efficiency after 5 cycles was 68%.
- Example 2 In a well-dried four-neck separable flask, 19.22 g (96.0 mmol) of DAE and 0.99 g (4.0 mmol) of APDS were dissolved in 150 g of NMP in a nitrogen atmosphere. PMDA 10.25g (47.0 millimoles) and BTDA 15.30g (47.5 millimoles) were added with NMP 34.0g here, and it stirred, cooling so that it might not become 50 ° C or more. Then, it stirred at 40 degreeC for 4 hours, and obtained the polyamic-acid B solution (solid content concentration of 20 weight%).
- a negative electrode was prepared in the same manner as in Example 1.
- the initial efficiency measured by the above method was 73%.
- the efficiency after 5 cycles was 65%.
- Example 3 In a well-dried four-neck separable flask, 19.22 g (96.0 mmol) of DAE and 0.99 g (4.0 mmol) of APDS were dissolved in 150 g of NMP in a nitrogen atmosphere. To this, 9.92 g (45.5 mmol) of PMDA and 15.00 g (45.0 mmol) of BTDA were added together with 30.5 g of NMP, and the mixture was stirred while cooling so as not to exceed 50 ° C. Then, it stirred at 40 degreeC for 4 hours, and obtained the polyamic-acid C solution (solid content concentration of 20 weight%).
- a negative electrode was prepared in the same manner as in Example 1. The initial efficiency was measured by the above method and found to be 74%. The efficiency after 5 cycles was 68%.
- Comparative Example 1 The amount of PMDA was changed from 10.03 g (46.0 mmol) to 10.47 g (48.0 mmol), the amount of BTDA was changed from 14.82 g (46.0 mmol) to 15.47 g (48.0 mmol), acid A polyamic acid D solution (solid content concentration 20% by weight) and a negative electrode were prepared in the same manner as in Example 1 except that the amount of NMP added after the addition of the components was changed from 30.2 g to 34.6 g. The initial efficiency measured by the above method was 72%. The efficiency after 5 cycles was 62%.
- Example 4 In a well-dried four-neck separable flask, 19.22 g (96.0 mmol) of DAE and 0.99 g (4.0 mmol) of APDS were dissolved in 150 g of NMP in a nitrogen atmosphere. PMDA 10.03g (45.0 mmol) and BTDA 14.82g (45.0 mmol) were added here with 39.7g of NMP, and it stirred, cooling so that it might not become 50 degreeC or more. Then, after stirring at 40 ° C. for 1 hour, 2.37 g (16.0 mmol) of phthalic anhydride was added, and further stirred at 40 ° C. for 3 hours to obtain a polyamic acid F solution (solid content concentration 20% by weight). .
- a negative electrode was prepared in the same manner as in Example 1. The initial efficiency measured by the above method was 72%. After 5 cycles of efficiency, it was 62%.
- Example 5 In a well-dried four-necked separable flask, 10.01 g (50.0 mmol) of DAE and 5.41 g (50.0 mmol) of PDA were dissolved in 120 g of NMP under a nitrogen atmosphere. To this, 27.65 g (94.0 mmol) of BPDA was added together with 52.2 g of NMP, and the mixture was stirred while cooling so as not to exceed 50 ° C. Then, it stirred at 40 degreeC for 4 hours, and obtained the polyamic-acid G solution (solid content concentration of 20 weight%).
- a negative electrode was prepared in the same manner as in Example 1. The initial efficiency was measured by the above method and found to be 74%. The efficiency after 5 cycles was 68%.
- Example 6 In a well-dried four-necked separable flask, 10.01 g (50.0 mmol) of DAE and 11.36 g (50.0 mmol) of DABA were dissolved in 150 g of NMP in a nitrogen atmosphere. To this, 27.65 g (94.0 mmol) of BPDA was added together with 46.1 g of NMP, and the mixture was stirred while cooling so as not to exceed 50 ° C. Then, it stirred at 40 degreeC for 4 hours, and obtained the polyamic-acid I solution (solid content concentration of 20 weight%).
- a negative electrode was prepared in the same manner as in Example 1. The initial efficiency was measured by the above method and found to be 74%. The efficiency after 5 cycles was 67%.
- Comparative Example 4 Example 6 except that the amount of BPDA was changed from 27.65 g (94.0 mmol) to 25.01 g (85.0 mmol), and the amount of NMP added after addition of the acid component was changed from 46.1 g to 35.5 g.
- a polyamic acid J solution solid content concentration 20% by weight
- a negative electrode were produced.
- the initial efficiency was 74%.
- the efficiency after 5 cycles was 20%.
- Table 1 shows the compositions and evaluation results of Examples 1 to 6 and Comparative Examples 1 to 4.
- the initial efficiency of the lithium ion battery can be improved.
- a negative electrode active material containing one or more atoms selected from silicon atoms, tin atoms, and germanium atoms is used, high initial efficiency can be obtained.
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Abstract
Description
ポリイミドは、後述するポリイミド前駆体を加熱処理や化学処理により閉環することにより得られ、テトラカルボン酸残基とジアミン残基を有するポリマーである。なお、ポリイミドの主鎖の一部にアミド結合を含むポリアミドイミドも好ましく用いることができる。
ポリアミド酸の場合、ジアミンをN-メチルピロリドン(NMP)、N,N-ジメチルホルムアミド(DMF)、N,N-ジメチルアセトアミド(DMAC)、ガンマブチロラクトン(GBL)、ジメチルスルホキシド(DMSO)などの溶媒に溶解し、テトラカルボン酸二無水物を添加して反応させる方法が一般的である。反応温度は-20℃~100℃が一般的であり、0℃~50℃が好ましい。反応時間は1分間~100時間が一般的であり、2時間~24時間が好ましい。反応中は窒素を流すなどして水分が系内に入らないようにすることが好ましい。
本発明のリチウムイオン電池負極用ペースト(以下、負極用ペーストと称する場合がある)は、本発明のバインダーと、ケイ素原子、スズ原子およびゲルマニウム原子から選ばれる1種以上の原子を含むリチウムイオン電池負極活物質とを含有する。このような負極活物質は、単位体積あたりの充放電容量が大きく、電池の大容量化に有用である。これらの負極活物質を2種以上含有してもよい。
HSセル(宝泉(株)製)を用いて、リチウムイオン電池を組み立て、充放電特性の評価を行った。リチウムイオン電池の組み立ては窒素雰囲気下でおこなった。セル内に実施例で作成した負極を直径16mmの円形に打ち抜いたもの、セパレーターとして多孔質フィルム(宝泉(株)製)を直径24mmの円形に打ち抜いたもの、正極として、コバルト酸リチウム製の活物質をアルミ箔に焼成したもの(宝泉(株)製)を直径16mmの円形に打ち抜いたものを順に重ね、電解液としてMIRET 1(三井化学(株)製)1mLを注入した上で封入して、リチウムイオン電池を得た。
粒径約10μmの天然黒鉛60g(富士黒鉛(株)製、CBF1)とナノシリコン粉末20g(アルドリッチ社製)と、カーボンブラック10g(三菱化学(株)製、3050)を混合し、ボールミル中600回転で12時間よく分散させ、その後、80℃で12時間真空乾燥してSi-C系の負極活物質を得た。
NMP:N-メチル-2-ピロリドン (三菱化学(株)製)
PDA:p-フェニレンジアミン (東京化成工業(株)製)
DABA:4,4’-ジアミノベンズアニリド (和歌山精化工業(株)製)
PMDA:無水ピロメリット酸(ダイセル(株)製)
BTDA:3,3’,4,4’-ベンゾフェノンテトラカルボン酸二無水物(ダイセル(株)製)
BPDA:3,3’,4,4’-ビフェニルテトラカルボン酸二無水物(三菱化学(株)製)
DAE:4,4’-ジアミノジフェニルエーテル(和歌山精化工業(株)製)
APDS:1,3-ビス(3-アミノプロピル)テトラメチルジシロキサン(東レダウコーニングシリコーン(株)製)。
よく乾燥させた4つ口セパラブルフラスコ中、窒素雰囲気下、DAE 19.22g(96.0ミリモル)とAPDS 0.99g(4.0ミリモル)をNMP 150gに溶解させた。ここにPMDA 10.03g(46.0ミリモル)とBTDA 14.82g(46.0ミリモル)をNMP 30.2gとともに加えて、50℃以上にならないように冷却しながら撹拌した。その後、40℃で4時間撹拌し、ポリアミド酸A溶液(固形分濃度20重量%)を得た。
よく乾燥させた4つ口セパラブルフラスコ中、窒素雰囲気下、DAE 19.22g(96.0ミリモル)とAPDS 0.99g(4.0ミリモル)をNMP 150gに溶解させた。ここにPMDA 10.25g(47.0ミリモル)とBTDA 15.30g(47.5ミリモル)をNMP 34.0gとともに加えて、50℃以上にならないように冷却しながら撹拌した。その後、40℃で4時間撹拌し、ポリアミド酸B溶液(固形分濃度20重量%)を得た。
よく乾燥させた4つ口セパラブルフラスコ中、窒素雰囲気下、DAE 19.22g(96.0ミリモル)とAPDS 0.99g(4.0ミリモル)をNMP 150gに溶解させた。ここにPMDA 9.92g(45.5ミリモル)とBTDA 15.00g(45.0ミリモル)をNMP 30.5gとともに加えて、50℃以上にならないように冷却しながら撹拌した。その後、40℃で4時間撹拌し、ポリアミド酸C溶液(固形分濃度20重量%)を得た。
PMDA量を10.03g(46.0ミリモル)から10.47g(48.0ミリモル)に変更し、BTDA量を14.82g(46.0ミリモル)から15.47g(48.0ミリモル)、酸成分添加後に追加したNMP量を30.2gから34.6gに変更した以外は実施例1と同様にしてポリアミド酸D溶液(固形分濃度20重量%)および負極を作製した。前記方法で初期効率を測定したところ72%であった。5サイクル後の効率は62%であった。
PMDA量を10.03g(46.0ミリモル)から9.60g(44.0ミリモル)に変更し、BTDA量を14.82g(46.0ミリモル)から14.18g(44.0ミリモル)、酸成分添加後に追加したNMP量を30.2gから30.0gに変更した以外は実施例1と同様にしてポリアミド酸E溶液(固形分濃度20重量%)および負極を作製した。前記方法で初期効率を測定したところ74%であった。5サイクル後の効率は25%であった。
よく乾燥させた4つ口セパラブルフラスコ中、窒素雰囲気下、DAE 19.22g(96.0ミリモル)とAPDS 0.99g(4.0ミリモル)をNMP 150gに溶解させた。ここにPMDA 10.03g(45.0ミリモル)とBTDA 14.82g(45.0ミリモル)をNMP 39.7gとともに加えて、50℃以上にならないように冷却しながら撹拌した。その後、40℃で1時間撹拌後、無水フタル酸 2.37g(16.0ミリモル)を添加し、さらに40℃で3時間攪拌し、ポリアミド酸F溶液(固形分濃度20重量%)を得た。
よく乾燥させた4つ口セパラブルフラスコ中、窒素雰囲気下、DAE 10.01g(50.0ミリモル)とPDA 5.41g(50.0ミリモル)をNMP 120gに溶解させた。ここにBPDA 27.65g(94.0ミリモル)をNMP 52.2gとともに加えて、50℃以上にならないように冷却しながら撹拌した。その後、40℃で4時間撹拌し、ポリアミド酸G溶液(固形分濃度20重量%)を得た。
BPDA量を27.65g(94.0ミリモル)から30.01g(102.0ミリモル)に変更し、酸成分添加後に追加したNMP量を48.6gから38.0gに変更した以外は実施例5と同様にしてポリアミド酸H溶液(固形分濃度20重量%)および負極を作製した。実施例1と同様に評価した結果、初期効率は68%であった。5サイクル後の効率は40%であった。
よく乾燥させた4つ口セパラブルフラスコ中、窒素雰囲気下、DAE 10.01g(50.0ミリモル)とDABA 11.36g(50.0ミリモル)をNMP 150gに溶解させた。ここにBPDA 27.65g(94.0ミリモル)をNMP 46.1gとともに加えて、50℃以上にならないように冷却しながら撹拌した。その後、40℃で4時間撹拌し、ポリアミド酸I溶液(固形分濃度20重量%)を得た。
BPDA量を27.65g(94.0ミリモル)から25.01g(85.0ミリモル)に変更し、酸成分添加後に追加したNMP量を46.1gから35.5gに変更した以外は実施例6と同様にしてポリアミド酸J溶液(固形分濃度20重量%)および負極を作製した。実施例1と同様に評価した結果、初期効率は74%であった。5サイクル後の効率は20%であった。
Claims (4)
- テトラカルボン酸残基とジアミン残基を含むポリイミド前駆体および/またはポリイミドを含むバインダーであって、テトラカルボン酸の残基として下記一般式(1)および(2)から選ばれたテトラカルボン酸二無水物の残基を含み、ジアミン残基として下記一般式(3)および(4)から選ばれたジアミンの残基を含み、かつ、ジアミン残基1モルに対して酸残基が0.90~0.95モルであるリチウムイオン電池電極用バインダー;
- 下記一般式(2)で表されるテトラカルボン酸二無水物の残基と下記一般式(3)および(4)から選ばれたジアミンの残基を含むポリイミド前駆体および/またはポリイミドを含むバインダーであって、ジアミン成分1モルに対して酸二無水物成分が0.90~0.95モルであるリチウムイオン電池電極用バインダー;
- 請求項1または2記載のリチウムイオン電池電極用バインダーならびにケイ素原子、スズ原子およびゲルマニウム原子から選ばれる1種以上の原子を含むリチウムイオン電池負極活物質を含有するリチウムイオン電池負極用ペースト。
- 請求項3記載のリチウムイオン電池負極用ペーストを金属箔上に1~100μmの厚みで塗布し、100~500℃で1分間~24時間熱処理するリチウムイオン電池負極の製造方法。
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US13/990,106 US9865879B2 (en) | 2010-11-30 | 2011-11-28 | Binder for lithium ion battery electrode, paste for lithium ion battery negative electrode, and method for producing lithium ion battery negative electrode |
JP2011554315A JP5338924B2 (ja) | 2010-11-30 | 2011-11-28 | リチウムイオン電池電極用バインダー、リチウムイオン電池負極用ペーストおよびリチウムイオン電池負極の製造方法 |
SG2013040902A SG190422A1 (en) | 2010-11-30 | 2011-11-28 | Binder for electrodes of lithium ion batteries, paste for negative electrodes of lithium ion batteries, and method for producing negative electrode of lithium ion battery |
KR1020137014621A KR101385546B1 (ko) | 2010-11-30 | 2011-11-28 | 리튬 이온 전지 전극용 바인더, 리튬 이온 전지 음극용 페이스트, 및 리튬 이온 전지 음극의 제조 방법 |
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2011
- 2011-11-28 SG SG2013040902A patent/SG190422A1/en unknown
- 2011-11-28 JP JP2011554315A patent/JP5338924B2/ja not_active Expired - Fee Related
- 2011-11-28 KR KR1020137014621A patent/KR101385546B1/ko not_active Expired - Fee Related
- 2011-11-28 US US13/990,106 patent/US9865879B2/en not_active Expired - Fee Related
- 2011-11-28 CN CN201180057067.3A patent/CN103238241B/zh not_active Expired - Fee Related
- 2011-11-28 WO PCT/JP2011/077308 patent/WO2012073853A1/ja active Application Filing
- 2011-11-29 TW TW100143714A patent/TW201242148A/zh unknown
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JP2009238659A (ja) * | 2008-03-28 | 2009-10-15 | Sanyo Electric Co Ltd | リチウム二次電池及びその製造方法 |
WO2010113991A1 (ja) * | 2009-03-31 | 2010-10-07 | 宇部興産株式会社 | 電極用バインダー樹脂前駆体溶液組成物 |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2012147930A1 (ja) * | 2011-04-28 | 2012-11-01 | 日本電気株式会社 | リチウム二次電池用負極活物質、これを用いたリチウム二次電池及びこれらの製造方法 |
US9325010B2 (en) | 2011-04-28 | 2016-04-26 | Nec Corporation | Negative electrode active material for lithium secondary cell, lithium secondary cell employing the same, and method for producing the same |
JP6007902B2 (ja) * | 2011-04-28 | 2016-10-19 | 日本電気株式会社 | リチウム二次電池用負極活物質、これを用いたリチウム二次電池及びこれらの製造方法 |
JP2014032908A (ja) * | 2012-08-06 | 2014-02-20 | Jsr Corp | 蓄電デバイスの負極用バインダー組成物 |
JP2014186997A (ja) * | 2012-11-09 | 2014-10-02 | Ube Ind Ltd | 電極用バインダー樹脂組成物、電極合剤ペースト、及び電極 |
JP2016520251A (ja) * | 2013-05-30 | 2016-07-11 | スリーエム イノベイティブ プロパティズ カンパニー | 電極組成物、電気化学セル、及び電気化学セルの作成方法 |
WO2016051784A1 (ja) * | 2014-09-30 | 2016-04-07 | 三井化学株式会社 | 二次電池用負極、及びその製造方法、並びにこれを備えたリチウムイオン二次電池 |
JPWO2016051784A1 (ja) * | 2014-09-30 | 2017-07-13 | 三井化学株式会社 | 二次電池用負極、及びその製造方法、並びにこれを備えたリチウムイオン二次電池 |
KR20170113597A (ko) | 2015-02-05 | 2017-10-12 | 가부시키가이샤 피아이 기쥬츠 켄큐쇼 | 리튬 이차 전지의 전극용 바인더 수지, 리튬 이차 전지용 전극 및 리튬 이차 전지 |
JP5995033B1 (ja) * | 2016-05-30 | 2016-09-21 | Jsr株式会社 | 蓄電デバイス電極用バインダー組成物、蓄電デバイス電極用スラリー、蓄電デバイス電極及び蓄電デバイス |
Also Published As
Publication number | Publication date |
---|---|
US20130260020A1 (en) | 2013-10-03 |
JP5338924B2 (ja) | 2013-11-13 |
CN103238241B (zh) | 2015-04-01 |
KR101385546B1 (ko) | 2014-04-15 |
KR20130079638A (ko) | 2013-07-10 |
US9865879B2 (en) | 2018-01-09 |
CN103238241A (zh) | 2013-08-07 |
SG190422A1 (en) | 2013-07-31 |
TW201242148A (en) | 2012-10-16 |
JPWO2012073853A1 (ja) | 2014-05-19 |
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