WO2022172843A1 - 負極バインダー組成物、負極、及び二次電池 - Google Patents
負極バインダー組成物、負極、及び二次電池 Download PDFInfo
- Publication number
- WO2022172843A1 WO2022172843A1 PCT/JP2022/004168 JP2022004168W WO2022172843A1 WO 2022172843 A1 WO2022172843 A1 WO 2022172843A1 JP 2022004168 W JP2022004168 W JP 2022004168W WO 2022172843 A1 WO2022172843 A1 WO 2022172843A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- negative electrode
- weight
- binder composition
- electrode binder
- parts
- Prior art date
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 114
- 239000011883 electrode binding agent Substances 0.000 title claims abstract description 56
- 239000000178 monomer Substances 0.000 claims abstract description 65
- 229920001577 copolymer Polymers 0.000 claims abstract description 44
- 230000008961 swelling Effects 0.000 claims abstract description 41
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 26
- 239000012046 mixed solvent Substances 0.000 claims abstract description 25
- 239000002253 acid Substances 0.000 claims abstract description 21
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 17
- 238000005259 measurement Methods 0.000 claims abstract description 11
- 229920006254 polymer film Polymers 0.000 claims abstract description 7
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 claims description 17
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 16
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 16
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 14
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 10
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 7
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 6
- 238000007654 immersion Methods 0.000 claims description 6
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims description 6
- 239000011976 maleic acid Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 claims description 4
- CYUZOYPRAQASLN-UHFFFAOYSA-N 3-prop-2-enoyloxypropanoic acid Chemical compound OC(=O)CCOC(=O)C=C CYUZOYPRAQASLN-UHFFFAOYSA-N 0.000 claims description 4
- NDWUBGAGUCISDV-UHFFFAOYSA-N 4-hydroxybutyl prop-2-enoate Chemical compound OCCCCOC(=O)C=C NDWUBGAGUCISDV-UHFFFAOYSA-N 0.000 claims description 4
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 4
- MYWGVEGHKGKUMM-UHFFFAOYSA-N carbonic acid;ethene Chemical compound C=C.C=C.OC(O)=O MYWGVEGHKGKUMM-UHFFFAOYSA-N 0.000 claims description 4
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 claims description 4
- CCJAYIGMMRQRAO-UHFFFAOYSA-N 2-[4-[(2-hydroxyphenyl)methylideneamino]butyliminomethyl]phenol Chemical compound OC1=CC=CC=C1C=NCCCCN=CC1=CC=CC=C1O CCJAYIGMMRQRAO-UHFFFAOYSA-N 0.000 claims description 3
- QZPSOSOOLFHYRR-UHFFFAOYSA-N 3-hydroxypropyl prop-2-enoate Chemical compound OCCCOC(=O)C=C QZPSOSOOLFHYRR-UHFFFAOYSA-N 0.000 claims description 3
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 claims description 3
- 229940088644 n,n-dimethylacrylamide Drugs 0.000 claims description 3
- YLGYACDQVQQZSW-UHFFFAOYSA-N n,n-dimethylprop-2-enamide Chemical compound CN(C)C(=O)C=C YLGYACDQVQQZSW-UHFFFAOYSA-N 0.000 claims description 3
- YPHQUSNPXDGUHL-UHFFFAOYSA-N n-methylprop-2-enamide Chemical compound CNC(=O)C=C YPHQUSNPXDGUHL-UHFFFAOYSA-N 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- IEVADDDOVGMCSI-UHFFFAOYSA-N 2-hydroxybutyl 2-methylprop-2-enoate Chemical compound CCC(O)COC(=O)C(C)=C IEVADDDOVGMCSI-UHFFFAOYSA-N 0.000 claims description 2
- NJRHMGPRPPEGQL-UHFFFAOYSA-N 2-hydroxybutyl prop-2-enoate Chemical compound CCC(O)COC(=O)C=C NJRHMGPRPPEGQL-UHFFFAOYSA-N 0.000 claims description 2
- VHSHLMUCYSAUQU-UHFFFAOYSA-N 2-hydroxypropyl methacrylate Chemical compound CC(O)COC(=O)C(C)=C VHSHLMUCYSAUQU-UHFFFAOYSA-N 0.000 claims description 2
- GWZMWHWAWHPNHN-UHFFFAOYSA-N 2-hydroxypropyl prop-2-enoate Chemical compound CC(O)COC(=O)C=C GWZMWHWAWHPNHN-UHFFFAOYSA-N 0.000 claims description 2
- SBWOBTUYQXLKSS-UHFFFAOYSA-N 3-(2-methylprop-2-enoyloxy)propanoic acid Chemical compound CC(=C)C(=O)OCCC(O)=O SBWOBTUYQXLKSS-UHFFFAOYSA-N 0.000 claims description 2
- GNSFRPWPOGYVLO-UHFFFAOYSA-N 3-hydroxypropyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCCO GNSFRPWPOGYVLO-UHFFFAOYSA-N 0.000 claims description 2
- YKXAYLPDMSGWEV-UHFFFAOYSA-N 4-hydroxybutyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCCCO YKXAYLPDMSGWEV-UHFFFAOYSA-N 0.000 claims description 2
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 claims description 2
- HNEGQIOMVPPMNR-IHWYPQMZSA-N citraconic acid Chemical compound OC(=O)C(/C)=C\C(O)=O HNEGQIOMVPPMNR-IHWYPQMZSA-N 0.000 claims description 2
- 229920002818 (Hydroxyethyl)methacrylate Polymers 0.000 claims 1
- 239000002002 slurry Substances 0.000 abstract description 37
- 239000007773 negative electrode material Substances 0.000 abstract description 24
- 239000002904 solvent Substances 0.000 abstract description 12
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 8
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 8
- 229920002678 cellulose Polymers 0.000 abstract description 3
- 239000001913 cellulose Substances 0.000 abstract description 3
- 239000002562 thickening agent Substances 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 description 49
- 238000003786 synthesis reaction Methods 0.000 description 48
- 239000011230 binding agent Substances 0.000 description 32
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 28
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical class [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 25
- 230000000052 comparative effect Effects 0.000 description 24
- 238000000034 method Methods 0.000 description 23
- 239000010408 film Substances 0.000 description 22
- 230000014759 maintenance of location Effects 0.000 description 22
- 238000006116 polymerization reaction Methods 0.000 description 20
- 229920000642 polymer Polymers 0.000 description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 18
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 14
- 239000000243 solution Substances 0.000 description 14
- 238000000576 coating method Methods 0.000 description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 239000011248 coating agent Substances 0.000 description 12
- 239000011149 active material Substances 0.000 description 11
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 9
- 239000012153 distilled water Substances 0.000 description 9
- 239000007864 aqueous solution Substances 0.000 description 8
- 239000003792 electrolyte Substances 0.000 description 8
- 229910002804 graphite Inorganic materials 0.000 description 8
- 239000010439 graphite Substances 0.000 description 8
- 238000002360 preparation method Methods 0.000 description 8
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 7
- 239000006230 acetylene black Substances 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 7
- 230000008859 change Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 239000005457 ice water Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 229920003048 styrene butadiene rubber Polymers 0.000 description 6
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 5
- 238000007664 blowing Methods 0.000 description 5
- 239000011888 foil Substances 0.000 description 5
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 5
- 229910001948 sodium oxide Inorganic materials 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910021383 artificial graphite Inorganic materials 0.000 description 4
- 239000002388 carbon-based active material Substances 0.000 description 4
- 239000001768 carboxy methyl cellulose Substances 0.000 description 4
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 4
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 4
- 229940105329 carboxymethylcellulose Drugs 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 239000008151 electrolyte solution Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000003039 volatile agent Substances 0.000 description 4
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 3
- 239000002033 PVDF binder Substances 0.000 description 3
- 239000004642 Polyimide Substances 0.000 description 3
- 239000004373 Pullulan Substances 0.000 description 3
- 229920001218 Pullulan Polymers 0.000 description 3
- 239000002174 Styrene-butadiene Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000011889 copper foil Substances 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003480 eluent Substances 0.000 description 3
- 238000009830 intercalation Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229920001721 polyimide Polymers 0.000 description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 3
- 235000019423 pullulan Nutrition 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 description 2
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 2
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- 229910013870 LiPF 6 Inorganic materials 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 239000003125 aqueous solvent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229920001940 conductive polymer Polymers 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 2
- BGTOWKSIORTVQH-UHFFFAOYSA-N cyclopentanone Chemical compound O=C1CCCC1 BGTOWKSIORTVQH-UHFFFAOYSA-N 0.000 description 2
- 238000009831 deintercalation Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910021382 natural graphite Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007719 peel strength test Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 239000004317 sodium nitrate Substances 0.000 description 2
- 235000010344 sodium nitrate Nutrition 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- ZZXUZKXVROWEIF-UHFFFAOYSA-N 1,2-butylene carbonate Chemical compound CCC1COC(=O)O1 ZZXUZKXVROWEIF-UHFFFAOYSA-N 0.000 description 1
- WNXJIVFYUVYPPR-UHFFFAOYSA-N 1,3-dioxolane Chemical compound C1COCO1 WNXJIVFYUVYPPR-UHFFFAOYSA-N 0.000 description 1
- OWPUOLBODXJOKH-UHFFFAOYSA-N 2,3-dihydroxypropyl prop-2-enoate Chemical compound OCC(O)COC(=O)C=C OWPUOLBODXJOKH-UHFFFAOYSA-N 0.000 description 1
- WKFQMDFSDQFAIC-UHFFFAOYSA-N 2,4-dimethylthiolane 1,1-dioxide Chemical compound CC1CC(C)S(=O)(=O)C1 WKFQMDFSDQFAIC-UHFFFAOYSA-N 0.000 description 1
- JWUJQDFVADABEY-UHFFFAOYSA-N 2-methyltetrahydrofuran Chemical compound CC1CCCO1 JWUJQDFVADABEY-UHFFFAOYSA-N 0.000 description 1
- VWIIJDNADIEEDB-UHFFFAOYSA-N 3-methyl-1,3-oxazolidin-2-one Chemical compound CN1CCOC1=O VWIIJDNADIEEDB-UHFFFAOYSA-N 0.000 description 1
- CMJLMPKFQPJDKP-UHFFFAOYSA-N 3-methylthiolane 1,1-dioxide Chemical compound CC1CCS(=O)(=O)C1 CMJLMPKFQPJDKP-UHFFFAOYSA-N 0.000 description 1
- 229920003026 Acene Polymers 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 229920002799 BoPET Polymers 0.000 description 1
- GAWIXWVDTYZWAW-UHFFFAOYSA-N C[CH]O Chemical group C[CH]O GAWIXWVDTYZWAW-UHFFFAOYSA-N 0.000 description 1
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 1
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 1
- 241000984084 Helianthemum nummularium subsp. grandiflorum Species 0.000 description 1
- 229910015015 LiAsF 6 Inorganic materials 0.000 description 1
- 229910013063 LiBF 4 Inorganic materials 0.000 description 1
- 229910013684 LiClO 4 Inorganic materials 0.000 description 1
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 229910011396 LiCoxNiyMnzO2 Inorganic materials 0.000 description 1
- 229910013275 LiMPO Inorganic materials 0.000 description 1
- 229910015645 LiMn Inorganic materials 0.000 description 1
- 229910015643 LiMn 2 O 4 Inorganic materials 0.000 description 1
- 229910014689 LiMnO Inorganic materials 0.000 description 1
- 229910013290 LiNiO 2 Inorganic materials 0.000 description 1
- 229910012424 LiSO 3 Inorganic materials 0.000 description 1
- 229910016003 MoS3 Inorganic materials 0.000 description 1
- 229910016040 MoV2O8 Inorganic materials 0.000 description 1
- CNCOEDDPFOAUMB-UHFFFAOYSA-N N-Methylolacrylamide Chemical compound OCNC(=O)C=C CNCOEDDPFOAUMB-UHFFFAOYSA-N 0.000 description 1
- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 1
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 229910003092 TiS2 Inorganic materials 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- KLARSDUHONHPRF-UHFFFAOYSA-N [Li].[Mn] Chemical compound [Li].[Mn] KLARSDUHONHPRF-UHFFFAOYSA-N 0.000 description 1
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 1
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 1
- 229920006243 acrylic copolymer Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- DISYGAAFCMVRKW-UHFFFAOYSA-N butyl ethyl carbonate Chemical compound CCCCOC(=O)OCC DISYGAAFCMVRKW-UHFFFAOYSA-N 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- FWBMVXOCTXTBAD-UHFFFAOYSA-N butyl methyl carbonate Chemical compound CCCCOC(=O)OC FWBMVXOCTXTBAD-UHFFFAOYSA-N 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 150000001733 carboxylic acid esters Chemical class 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- VUPKGFBOKBGHFZ-UHFFFAOYSA-N dipropyl carbonate Chemical compound CCCOC(=O)OCCC VUPKGFBOKBGHFZ-UHFFFAOYSA-N 0.000 description 1
- 238000007606 doctor blade method Methods 0.000 description 1
- 239000011267 electrode slurry Substances 0.000 description 1
- 238000007610 electrostatic coating method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 238000007756 gravure coating Methods 0.000 description 1
- 229910021385 hard carbon Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000004128 high performance liquid chromatography Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000003273 ketjen black Substances 0.000 description 1
- 239000005001 laminate film Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- DMEJJWCBIYKVSB-UHFFFAOYSA-N lithium vanadium Chemical class [Li].[V] DMEJJWCBIYKVSB-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910052976 metal sulfide Inorganic materials 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- KKQAVHGECIBFRQ-UHFFFAOYSA-N methyl propyl carbonate Chemical compound CCCOC(=O)OC KKQAVHGECIBFRQ-UHFFFAOYSA-N 0.000 description 1
- 239000012982 microporous membrane Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 229910052961 molybdenite Inorganic materials 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- TVWWSIKTCILRBF-UHFFFAOYSA-N molybdenum trisulfide Chemical compound S=[Mo](=S)=S TVWWSIKTCILRBF-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000005486 organic electrolyte Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000008055 phosphate buffer solution Substances 0.000 description 1
- 229920002755 poly(epichlorohydrin) Polymers 0.000 description 1
- 229920002627 poly(phosphazenes) Polymers 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 229920001197 polyacetylene Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920000767 polyaniline Polymers 0.000 description 1
- 229920005596 polymer binder Polymers 0.000 description 1
- 239000002491 polymer binding agent Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920000128 polypyrrole Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920000123 polythiophene Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- FOWDZVNRQHPXDO-UHFFFAOYSA-N propyl hydrogen carbonate Chemical compound CCCOC(O)=O FOWDZVNRQHPXDO-UHFFFAOYSA-N 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000011856 silicon-based particle Substances 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- RPACBEVZENYWOL-XFULWGLBSA-M sodium;(2r)-2-[6-(4-chlorophenoxy)hexyl]oxirane-2-carboxylate Chemical compound [Na+].C=1C=C(Cl)C=CC=1OCCCCCC[C@]1(C(=O)[O-])CO1 RPACBEVZENYWOL-XFULWGLBSA-M 0.000 description 1
- OTNVGWMVOULBFZ-UHFFFAOYSA-N sodium;hydrochloride Chemical compound [Na].Cl OTNVGWMVOULBFZ-UHFFFAOYSA-N 0.000 description 1
- 229910021384 soft carbon Inorganic materials 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- GRUMUEUJTSXQOI-UHFFFAOYSA-N vanadium dioxide Chemical compound O=[V]=O GRUMUEUJTSXQOI-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/20—Esters of polyhydric alcohols or phenols, e.g. 2-hydroxyethyl (meth)acrylate or glycerol mono-(meth)acrylate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/44—Preparation of metal salts or ammonium salts
-
- 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
-
- 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
-
- 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
-
- 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 binder composition, a negative electrode and a secondary battery using the same.
- binder for the negative electrode of lithium-ion secondary batteries it is common to use a combination of water-soluble polymer carboxymethylcellulose sodium salt (CMC) and water-based latex resin styrene-butadiene copolymer (SBR).
- CMC carboxymethylcellulose sodium salt
- SBR water-based latex resin styrene-butadiene copolymer
- the main functions of the binder during the electrode fabrication process are: 1) a function to uniformly disperse components such as active materials and conductive aids, 2) a function to adjust the rheology of the electrode mixture slurry, and 3) a function to apply and dry the slurry. and 4) a function of binding the mixture component and the current collector, and the like.
- a function related to battery performance 5) a function to suppress electrode expansion due to volume change of the active material generated during charge / discharge cycles and 6) a function to maintain the binding between the active material and the current collector and improve electronic conductivity. and 7) the function of ensuring ionic conductivity by moderately swelling with the electrolyte.
- Lithium-ion secondary batteries are widely used as a rechargeable power source for notebook computers and mobile phones, but in recent years, they have been used in power tools such as electric tools, as well as medium-sized equipment such as automobiles and stationary power storage equipment. is expanding rapidly. With the rapid expansion of the application range, the performance required for batteries in a wider temperature range varies, but the three performances of capacity, output and life are the main performances that are emphasized, and improvements in these are particularly important. Desired.
- new negative electrode active materials are being studied to replace conventionally widely used carbon-based active materials (for example, graphite) in an effort to increase the capacity.
- New negative electrode active materials include tin alloys, silicon alloys, and silicon oxides. These new negative electrode active materials have a capacity several times as large as that of the carbon-based active material, and can increase the negative electrode capacity even by adding a small amount.
- the SEI film formed on the surface of the active material is destroyed because it cannot follow the volume change, the surface of the active material not covered with the SEI film is exposed, and the electrolytic solution is decomposed due to a new SEI film formation reaction. is also progressing.
- the SEI film is formed on the surface of the active material during the initial charge, and is mainly composed of decomposition products of the electrolyte. It is believed that the binder resin in contact with the surface of the active material also participates in the film formation.
- This SEI film is thought to play a role in mediating the intercalation/deintercalation reaction of lithium ions, and at the same time, it is believed that it contributes to the improvement of battery performance by, for example, suppressing the further decomposition reaction of the electrolytic solution. If the SEI film is too thin, the decomposition reaction of the electrolyte will not stop.
- Patent Document 1 As an effort to solve the problem caused by the volume change of the new negative electrode active material, for example, in Patent Document 1 below, by using a high-strength aromatic polyimide as a binder, the swelling of the electrode layer due to the volume change of the negative electrode active material is suppressed. Techniques for suppressing them have been proposed. Further, Patent Document 2 proposes a method of suppressing volume change of the negative electrode active material by using partially crosslinked polyacrylic acid as a binder. Further, Patent Literature 3 proposes a method of suppressing the volume change of the negative electrode active material by using a copolymer of acrylic acid and polyvinyl alcohol as a binder. However, with the binder of Document 1, the initial charge/discharge efficiency was poor, and the capacity of the active material could not be fully exhibited. Further, the binders of Documents 2 and 3 did not necessarily have sufficient high-temperature and low-temperature cycle characteristics.
- an object of the present invention is to provide a negative electrode and a secondary battery that can provide good battery performance even when using a novel active material.
- a negative electrode binder composition containing a copolymer containing a hydroxyl group-containing monomer (a) and an acid group-containing monomer (b) as essential components, the copolymer measured using an aqueous GPC measuring device has a weight average molecular weight of 700,000 or more, and the dried polymer film of the negative electrode binder composition is placed in a carbonate-based mixed solvent (EC (ethylene carbonate) / DEC (diethylene carbonate) 50/50 (wt)) at 45 ° C.
- EC ethylene carbonate
- DEC diethylene carbonate
- the hydroxyl group-containing monomer (a) is 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 3-hydroxypropyl acrylate, 2-hydroxybutyl acrylate, 4-hydroxybutyl acrylate. , 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 3-hydroxypropyl methacrylate, 2-hydroxybutyl methacrylate, and 4-hydroxybutyl methacrylate according to any one or more of the group consisting of [1] A negative electrode binder composition.
- the acid group-containing monomer (b) is acrylic acid, methacrylic acid, maleic acid, monomethyl maleic acid, 2-carboxyethyl acrylate, 2-carboxyethyl methacrylate, maleic acid, and itaconic acid
- the negative electrode binder composition according to [1] or [2] which is one or more.
- the negative electrode binder composition of the present invention has good slurry stability even without a thickening agent such as cellulose, and a negative electrode produced using this composition suppresses expansion of the electrode during charging. Therefore, the negative electrode produced from the negative electrode binder composition of the present invention has high peel strength, and as a result, when the battery is evaluated, it exhibits good charge-discharge characteristics even at a high number of cycles. performance can be achieved.
- the negative electrode binder composition of the present invention is a negative electrode binder composition containing a copolymer containing a hydroxyl group-containing monomer (a) and an acid group-containing monomer (b) as essential components, and was measured using an aqueous GPC measurement device.
- the weight average molecular weight of the copolymer is 700,000 or more, and the swelling rate after immersing the dried polymer film of the negative electrode binder composition in a carbonate-based mixed solvent at 45 ° C. for 72 hours is 0 to 10. % by weight.
- the weight-average molecular weight of the copolymer measured using an aqueous GPC measuring device is 700,000 or more, preferably 750,000 to 1,500,000, more preferably 800,000 to 1,000. 200,000.
- the weight-average molecular weight is 700,000 or more, as described in the effects of the invention, the slurry stability is good, and the negative electrode produced using this is suppressed from swelling during charging.
- a polymer-based filler such as general polyhydroxymethacrylate can be used as a column filler.
- the column for example, Shodex OHpak series SB-806 HQ and SB-806M HQ manufactured by Showa Denko KK can be used.
- a neutral salt solution such as an aqueous sodium nitrate solution, an aqueous sodium hydrogen chloride solution, an aqueous sodium sulfate solution, or a phosphate buffer solution can be used.
- the concentration of these eluents is preferably about 0.1 to 0.3 mol/L, for example.
- a Shimadzu/L20 system or the like can be used as a GPC measurement device.
- Polystyrene or pullulan can be used as a standard substance in GPC measurement.
- STANDARD P-82 (Pullulan) manufactured by Showa Denko KK can be used as a standard substance.
- the swelling ratio after immersing the dried polymer film of the negative electrode binder composition in the carbonate-based mixed solvent at 45° C. for 72 hours is 0 to 10% by weight. 6% by weight, more preferably 0.1 to 4% by weight.
- a lower swelling rate is preferable, and when the swelling rate is within the above range, the peel strength when used as a negative electrode is high, and as a result, when a battery is evaluated, good charge-discharge characteristics are exhibited even at a high number of cycles. be able to.
- a high swelling ratio means that the negative electrode binder composition contains a solvent and is easily plasticized, and the adhesive strength tends to decrease when used as a negative electrode.
- Examples of the hydroxyl group-containing monomer (a) in the copolymer include hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, and 2,3-dihydroxypropyl acrylate. Among them, hydroxyethyl acrylate (especially 2-hydroxyethyl acrylate) is preferable as the hydroxyl group-containing monomer (a).
- the content of the hydroxyl group-containing monomer (a) is, for example, 20 to 80% by weight, preferably 30 to 70% by weight, based on the total amount of monomers constituting the copolymer. When the content of the hydroxyl group-containing monomer (a) is within the above range, both the slurry stability and the electrolyte swelling resistance at high temperatures when formed into a film tend to be good.
- Examples of the acid group-containing monomer (b) in the copolymer include acrylic acid, methacrylic acid, 2-carboxyethyl acrylate, maleic acid, and itaconic acid.
- Carboxylic acid is preferred as the acid group in the acid group-containing monomer (b).
- Acrylic acid is particularly preferred as the acid group-containing monomer (b).
- the content of the acid group-containing monomer (b) is, for example, 10 to 60% by weight, preferably 20 to 50% by weight, based on the total amount of monomers constituting the copolymer. When the content of the acid group-containing monomer (b) is within the above range, both the slurry stability and the electrolyte swelling resistance at high temperatures when formed into a film tend to be good.
- the monomers constituting the copolymer may contain monomers other than the hydroxyl group-containing monomer (a) and the acid group-containing monomer (b) (hereinafter referred to as "other monomers (c)").
- Other monomers (c) include, for example, acrylamide, methacrylamide, N-methylacrylamide, N,N-dimethylacrylamide and N-hydroxymethylacrylamide.
- acrylamide is particularly preferable, and the inclusion of acrylamide has the effect of increasing toughness when formed into a film.
- their content is, for example, 5 to 40% by weight, preferably 5 to 20% by weight.
- the content of the other monomer (c) is within the above range, the electrolyte swelling resistance at high temperatures tends to be good.
- the copolymer in the negative electrode binder composition of the present invention is a structural unit derived from each of the hydroxyl group-containing monomer (a), the acid group-containing monomer (b), and other monomers (c) added as necessary. have units.
- the copolymer can be obtained by appropriately preparing a hydroxyl group-containing monomer (a) and an acid group-containing monomer (b), as described later, and other monomers (c) to be added as necessary, and copolymerizing them by a known and commonly used method. can get.
- the negative electrode binder composition of the present invention contains, in addition to the above copolymer, components necessary for forming a negative electrode, such as SiO negative electrode material, graphite, acetylene black, and solvent.
- components necessary for forming a negative electrode such as SiO negative electrode material, graphite, acetylene black, and solvent.
- any type of SiO negative electrode material or graphite can be used.
- the ratio of the copolymer (nonvolatile content) in the negative electrode binder composition is, for example, 3 to 50% by weight, preferably 3 to 40% by weight.
- the above SiO negative electrode material is a material containing SiO (silicon monoxide) as a main component that expresses the charge/discharge characteristics of the negative electrode.
- SiO silicon monoxide
- it may also contain silicon particles, carbon, and the like that similarly exhibit charge-discharge characteristics.
- silicon oxycarbide (SiOC) may be included as the SiO negative electrode material. These components may be used singly or in combination.
- the ratio of the SiO negative electrode material in the negative electrode binder composition is, for example, 3 to 40% by weight, preferably 5 to 30% by weight.
- the above graphite may be natural graphite or artificial graphite that is artificially synthesized.
- Examples of graphite include carbon materials such as natural graphite, artificial graphite, hard carbon, and soft carbon.
- Graphite like the SiO negative electrode material, is also a component that exhibits charge-discharge characteristics.
- the proportion of graphite in the negative electrode binder composition is, for example, 3 to 40% by weight, preferably 5 to 30% by weight.
- the acetylene black acts as a conductive aid in the negative electrode, and may be carbon black, ketjen black, or the like, which is a component other than acetylene black.
- the proportion of these components acting as conductive aids in the negative electrode binder composition is, for example, 0.5 to 10% by weight, preferably 0.5 to 5% by weight.
- the solvent is not particularly limited as long as it can disperse the components necessary for forming the negative electrode, but a water-based solvent can be used, and ion-exchanged water is preferable.
- the proportion of the solvent in the negative electrode binder composition is, for example, 50-95% by weight, preferably 60-90% by weight.
- the ratio of the nonvolatile components excluding the solvent in the negative electrode binder composition of the present invention is, for example, 5 to 30% by weight, preferably 10 to 20% by weight.
- the negative electrode binder composition of the present invention may contain conventionally used components other than the above as binder (binder) components within a range that does not impair the effects of the present invention.
- binder components include styrene-butadiene rubber copolymer (SBR); ethylenically unsaturated carboxylic acid esters (eg, methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate); , (meth)acrylonitrile, and hydroxyethyl (meth)acrylate, etc.), and (meth)acrylic copolymers consisting of ethylenically unsaturated carboxylic acids (e.g., acrylic acid, methacrylic acid, itaconic acid, fumaric acid, maleic acid, etc.) Coalescing; Polymer compounds such as polyvinylidene fluoride, polyethylene oxide, polyepichlorohydrin, polyphosphazene, polyacrylonit
- the negative electrode binder composition of the present invention may contain an organic solvent such as N-methyl-2-pyrrolidone (NMP) in order to dissolve the polymer compound.
- NMP N-methyl-2-pyrrolidone
- the negative electrode binder composition of the present invention may contain components necessary as negative electrode components.
- a copolymer which is an essential component of the negative electrode binder composition, is synthesized.
- the copolymer is prepared by charging a solvent such as water into a reaction vessel and heating to 50 to 80° C., followed by addition of a hydroxyl group-containing monomer (a), an acid group-containing monomer (b), and other optional monomers (c). and a mixture of a polymerization initiator such as ammonium persulfate to allow the polymerization reaction to proceed.
- the polymerization reaction may be performed under an inert gas atmosphere such as nitrogen.
- the polymerization reaction can be carried out at a temperature of 50-80° C. for 1-10 hours. After completion of the reaction, it is cooled and pH is adjusted.
- SiO negative electrode material, graphite, acetylene black, solvent, and other components necessary for forming a negative electrode are added to the obtained copolymer, and dispersed in an aqueous solvent such as ion-exchanged water.
- a dispersing device such as a stirrer, ball mill, super sand mill, pressure kneader, or the like may be used.
- it may be prepared by performing kneading with a kneader.
- a negative electrode binder composition can be manufactured through such dispersion and kneading.
- the negative electrode of the present invention contains the negative electrode binder composition as a component.
- the negative electrode of the present invention can be obtained by applying the slurry, which is the negative electrode binder composition obtained above, onto a current collector copper foil to form a negative electrode layer as a thin film. Further, as described below, the negative electrode may be obtained by forming a slurry, which is a negative electrode binder composition, into a shape such as a sheet or pellet, and integrating this with a current collector.
- the material and shape of the current collector are not particularly limited.
- copper, nickel, titanium, stainless steel, or the like may be used in the form of a foil, a perforated foil, or a mesh.
- Porous materials such as porous metal (foamed metal) and carbon paper can also be used.
- the method for applying the negative electrode material slurry to the current collector is not particularly limited, but examples include a metal mask printing method, an electrostatic coating method, a dip coating method, a spray coating method, a roll coating method, a doctor blade method, and a gravure coating. well-known methods such as a method, a screen printing method, and the like. After coating, it is preferable to carry out a rolling treatment using a flat plate press, calendar rolls, or the like, if necessary.
- the integration of the negative electrode material slurry formed into a sheet-like, pellet-like shape, etc., and the current collector can be performed by a known method such as roll, press, or a combination thereof.
- the electrode density after integration is, for example, 1.0 to 1.8 g/cm 3 , preferably 1.1 to 1.7 g/cm 3 .
- the negative electrode layer formed on the current collector and the negative electrode layer integrated with the current collector are preferably heat-treated.
- the heat treatment conditions are, for example, 80 to 150° C. for 5 to 20 hours. This heat treatment removes the solvent and hardens the binder to increase the strength, thereby improving the adhesion between the particles and between the particles and the current collector.
- These heat treatments are preferably performed in an inert atmosphere such as helium, argon, or nitrogen, or in a vacuum atmosphere in order to prevent oxidation of the current collector during the treatment.
- a secondary battery of the present invention includes the negative electrode of the present invention.
- the positive electrode and the negative electrode of the present invention can be arranged facing each other with a separator interposed therebetween, and an electrolytic solution is injected. can.
- the positive electrode can be obtained by forming a positive electrode layer on the surface of the current collector in the same manner as the negative electrode.
- the current collector may be a strip-shaped one made of a metal or alloy such as aluminum, titanium, or stainless steel in the form of foil, foil with holes, mesh, or the like.
- the positive electrode material used for the positive electrode layer is not particularly limited.
- secondary batteries when producing a lithium ion secondary battery, for example, if a metal compound, metal oxide, metal sulfide, or a conductive polymer material capable of doping or intercalating lithium ions is used, Well, not particularly limited.
- lithium cobaltate LiCoO 2
- lithium nickelate LiNiO 2
- lithium manganate LiMnO 2
- lithium manganese spinel LiMn 2 O 4
- lithium vanadium compounds V2O5 , V6O13 , VO2 , MnO2
- TiO2 , MoV2O8 TiS2 , V2S5 , VS2
- olivine-type LiMPO 4 M: Co, Ni, Mn, Fe
- conductive polymers such as polyacetylene, polyaniline, polypyrrole, polythiophene, polyacene, etc., porous carbon, etc. are used singly or in combination. be able to.
- the separator for example, a non-woven fabric, cloth, microporous film, or a combination of them can be used, the main component of which is polyolefin such as polyethylene or polypropylene.
- the positive electrode and the negative electrode of the non-aqueous electrolyte secondary battery to be manufactured are structured such that they do not come into direct contact with each other, there is no need to use a separator.
- electrolytes examples include lithium salts such as LiClO 4 , LiPF 6 , LiAsF 6 , LiBF 4 and LiSO 3 CF 3 , ethylene carbonate, propylene carbonate, butylene carbonate, vinylene carbonate, fluoroethylene carbonate, cyclopentanone, and sulfolane.
- the structure of the secondary battery of the present invention is not particularly limited, but usually, a positive electrode, a negative electrode, and an optional separator are wound into a flat spiral to form a wound electrode plate group. It is common to have a structure in which flat plates are laminated to form a laminated electrode plate group, and these electrode plate groups are enclosed in an outer package.
- the secondary battery of the present invention is not particularly limited, it can be used as a paper-type battery, a button-type battery, a coin-type battery, a laminate-type battery, a cylindrical battery, a square-type battery, or the like.
- the negative electrode active material of the present invention described above can also be applied to general electrochemical devices having a charging/discharging mechanism of intercalating and deintercalating lithium ions, such as hybrid capacitors and solid lithium secondary batteries.
- a copolymer was synthesized by the method of Synthesis Example 1-7 below, and a negative electrode was produced by the method of Example 1-3 and Comparative Example 1-4 using the obtained copolymer.
- Secondary batteries were fabricated by the methods of Examples 4-6 and Comparative Examples 5-10 using the obtained negative electrode and a separately fabricated positive electrode.
- the copolymer thus obtained had a non-volatile content of 14.8% by weight, a pH of 6.8, a viscosity of 3080 mPa ⁇ s, and a weight average molecular weight of 850,000 as measured by aqueous GPC.
- the resulting copolymer had a non-volatile content of 15.1% by weight, a pH of 7.1, a viscosity of 3100 mPa ⁇ s, and a weight average molecular weight of 730,000 as measured by aqueous GPC. Moreover, the degree of swelling with respect to the carbonate mixed solvent was 2.9%.
- Synthesis Example 7 A polymerization reaction was carried out in the same manner as in Synthesis Example 5 except that a 5 mol/L sodium hydroxide aqueous solution was used instead of the 25% aqueous ammonia.
- the resulting copolymer had a non-volatile content of 15.0% by weight, a pH of 7.0, a viscosity of 13200 mPa ⁇ s, and a weight average molecular weight of 780,000 as measured by aqueous GPC. Further, the degree of swelling with respect to the carbonate mixed solvent was 3.7%.
- the resulting copolymer had a non-volatile content of 15.0% by weight, a pH of 7.0, a viscosity of 17100 mPa ⁇ s, and a weight average molecular weight of 830,000 as measured by aqueous GPC. Further, the degree of swelling with respect to the carbonate mixed solvent was 3.2%.
- Synthesis Example 14 Synthesis Example 1 was repeated except that 20.0 parts by weight of acrylic acid, 80.0 parts by weight of 2-hydroxyethyl acrylate, and 0.340 parts by weight of ammonium persulfate (1500 ppm based on the total number of moles of monomers) were used. A polymerization reaction was carried out. The copolymer thus obtained had a non-volatile content of 14.9% by weight, a pH of 7.0, a viscosity of 2800 mPa ⁇ s, and a weight average molecular weight of 750,000 as measured by aqueous GPC. Further, the degree of swelling with respect to the carbonate mixed solvent was 18.8%.
- the resulting copolymer had a non-volatile content of 15.0% by weight, a pH of 7.0, a viscosity of 4300 mPa ⁇ s, and a weight average molecular weight of 750,000 as measured by aqueous GPC. Further, the degree of swelling with respect to the carbonate mixed solvent was 12.3%.
- the resulting copolymer had a non-volatile content of 15.0% by weight, a pH of 7.0, a viscosity of 8900 mPa ⁇ s, and a weight average molecular weight of 820,000 as measured by aqueous GPC. Further, the degree of swelling with respect to the carbonate mixed solvent was 3.5%.
- the polymer shown in Synthesis Example 1 (non-volatile content: 14.8% by weight) was diluted with distilled water and adjusted to a non-volatile content concentration of 8.0%. 16 parts by weight) and 19.0 parts by weight of distilled water were added and mixed until the whole became a paste. Then, the mixture was stirred for 2 minutes with a rotation/revolution mixer (ARE-310 manufactured by Thinky) under the conditions of 1000 rpm of rotation and 2000 rpm of revolution. After stirring again for 2 minutes under the conditions of 1000 rpm of rotation and 2000 rpm of revolution, the mixture was cooled to room temperature with ice water.
- ARE-310 manufactured by Thinky
- the mixture layer density was measured again and found to be 1.50 g/cm 3 (the thickness of the mixture layer was 68.6 ⁇ m).
- the initial charge capacity per unit area of this electrode is 4.95 mAh/cm 2 .
- the negative electrode of Example 1 surface density of 8.8 gm/cm 2 , mixture layer density of 1.5 g/cm 3 , mixture layer thickness of 68.6 ⁇ m, unit area initial charge capacity of 4.95 mAh/cm 2 ) was obtained. Got.
- a peel strength test sample was mounted on a peel tester (Autograph AG-X Plus, manufactured by Shimadzu Corporation), and a 180° peel test was performed. Peel strength was 34.5 N/m. Then, the state of peeling (destruction) of the negative electrode coating film was observed. Further, the negative electrode coating film was wound around a core of ⁇ 5 mm, and it was visually observed whether or not cracks occurred in the coating film. No cracks were generated at this time.
- Example 1 was the same as Example 1, except that the polymer shown in Synthesis Example 2 was used as the binder mixture for preparing the slurry.
- the peel strength at this time was 27.8 N/m. Also, no cracks were generated.
- Example 1 was the same as Example 1, except that the polymer shown in Synthesis Example 3 was used as the binder mixture for preparing the slurry.
- the peel strength at this time was 28.9 N/m. Also, no cracks were generated.
- Example 4 Example 1 was the same as Example 1, except that the polymer shown in Synthesis Example 4 was used as the binder mixture for preparing the slurry. The peel strength at this time was 24.5 N/m. Also, no cracks were generated.
- Example 5 The procedure was the same as in Example 1 except that the polymer shown in Synthesis Example 5 was used as the binder mixture used to prepare the slurry. The peel strength at this time was 30.7 N/m. Also, no cracks were generated.
- Example 6 The procedure was the same as in Example 1, except that the polymer shown in Synthesis Example 6 was used as the binder mixture for preparing the slurry.
- the peel strength at this time was 29.5 N/m. Also, no cracks were generated.
- Example 7 Example 1 was the same as Example 1, except that the polymer shown in Synthesis Example 7 was used as the binder mixture for preparing the slurry. The peel strength at this time was 34.6 N/m. Also, no cracks were generated.
- Example 1 was the same as Example 1, except that the polymer shown in Synthesis Example 8 was used as the binder mixture for preparing the slurry.
- the peel strength at this time was 28.4 N/m. Also, no cracks were generated.
- Example 9 Example 1 was the same as Example 1, except that the polymer shown in Synthesis Example 9 was used as the binder mixture for preparing the slurry. The peel strength at this time was 29.1 N/m. Also, no cracks were generated.
- Example 10 Example 1 was the same as Example 1 except that the polymer shown in Synthesis Example 10 was used as the binder mixture used to prepare the slurry. The peel strength at this time was 30.5 N/m. Also, no cracks were generated.
- Example 11 Example 1 was the same as Example 1, except that the polymer shown in Synthesis Example 11 was used as the binder mixture for preparing the slurry. The peel strength at this time was 28.6 N/m. Also, no cracks were generated.
- Example 1 was the same as Example 1, except that the polymer shown in Synthesis Example 12 was used as the binder mixture for preparing the slurry.
- the peel strength at this time was 28.4 N/m. Also, no cracks were generated.
- Example 1 was the same as Example 1, except that the polymer shown in Synthesis Example 13 was used as the binder mixture for preparing the slurry.
- the peel strength at this time was 17.4 N/m. Also, no cracks were generated.
- Example 1 was the same as Example 1, except that the polymer shown in Synthesis Example 14 was used as the binder mixture for preparing the slurry.
- the peel strength at this time was 14.5 N/m. Also, no cracks were generated.
- Example 1 was the same as Example 1 except that the polymer shown in Synthesis Example 15 was used as the binder mixture for preparing the slurry.
- the peel strength at this time was 15.2 N/m. Also, no cracks were generated.
- Example 1 was the same as Example 1 except that the polymer shown in Synthesis Example 16 was used as the binder mixture for preparing the slurry.
- the peel strength at this time was 14.5 N/m. Also, no cracks were generated.
- Example 5 The procedure was the same as in Example 1, except that the above sodium polyacrylate (manufactured by Fuji Film Wako Pure Chemical Industries, Ltd., degree of polymerization: 22,000 to 70,000) was used as the binder mixture used to prepare the slurry. The peel strength at this time was 8.1 N/m. Also, no cracks were generated.
- the above sodium polyacrylate manufactured by Fuji Film Wako Pure Chemical Industries, Ltd., degree of polymerization: 22,000 to 70,000
- the peel strength at this time was 8.1 N/m. Also, no cracks were generated.
- Carboxymethyl cellulose Na salt (CMC, Sunrose MAC350HC manufactured by Nippon Paper Industries Co., Ltd.) is dissolved in distilled water, and an aqueous solution adjusted to a nonvolatile concentration of 2.0% is added to 48.0 parts by weight (0.96 weight in terms of solid content Part) was added and mixed until the whole became a paste. Then, the mixture was stirred for 2 minutes with a rotation/revolution mixer (ARE-310 manufactured by Thinky) under the conditions of 1000 rpm of rotation and 2000 rpm of revolution. After stirring again for 2 minutes under the conditions of 1000 rpm of rotation and 2000 rpm of revolution, the mixture was cooled to room temperature with ice water.
- ARE-310 manufactured by Thinky
- the binder resin, peel strength, and 5 ⁇ bending crack resistance used in the negative electrodes produced in Examples 1-12 and Comparative Examples 1-6 are shown in Table 2 below.
- the viscosity was measured with a B-type viscometer, and anhydrous N-methylpyrrolidone was appropriately added so that the viscosity was within the range of 2000 to 4000 Pa ⁇ s at 30 rpm.
- the mixture was stirred for 30 seconds with a rotation/revolution mixer (ARE-310 manufactured by Thinky) under the conditions of 1000 rpm of rotation and 2000 rpm of revolution to prepare a positive electrode mixture slurry.
- ARE-310 manufactured by Thinky
- the initial charge capacity per unit area of this electrode is 4.49 mAh/cm 2 .
- a positive electrode surface density of 25.0 gm/cm 2 , mixture layer density of 3.4 g/cm 3 , mixture layer thickness of 73.3 ⁇ m, unit area initial charge capacity of 4.49 mAh/cm 2 ) was obtained.
- Example 13 “Fabrication of secondary batteries” [Example 13] First, the negative electrode shown in Example 1 was cut into a 24 mm ⁇ 24 mm square with a tab, and the positive electrode shown in the positive electrode preparation example was cut into a 22 mm ⁇ 22 mm square with a tab using a Thomson blade. A tab lead made of nickel for the negative electrode and an aluminum tab lead for the positive electrode were welded to the tab portions of the cut electrodes. Next, the separator (25 micron thick polyethylene microporous membrane) was cut into 28 mm ⁇ 3.8 cm rectangles using a Thomson blade. The positive electrode and the negative electrode were opposed to each other with a separator interposed therebetween, wrapped with a laminate film, and the tab portion was fixed by thermocompression bonding.
- the separator 25 micron thick polyethylene microporous membrane
- the secondary battery produced above was attached to a charging/discharging device, left at 25° C. for 3 hours, and then charged/discharged once at 0.1C.
- the initial charge/discharge efficiency at this time was 81.2%.
- charging and discharging were repeated 50 times at 0.2C.
- the discharge capacity retention rate at the 50th discharge was 85.0% when the discharge capacity at the 0.2C first discharge was taken as 100%.
- Electrode swelling rate After the first charge and discharge, the battery was held at 45° C. and charged once at 0.5 C. After that, the secondary battery was disassembled in a dry room, and the fully charged negative electrode was taken out. After washing with dimethyl carbonate and air drying, the electrode thickness was measured with a micrometer. As a result of calculating the electrode swelling rate from the following (formula 2), it was 32.0%.
- Electrode swelling rate (%) (thickness of dismantled electrode - thickness of electrode when manufacturing battery) / (thickness of mixture layer when manufacturing battery) x 100 (Formula 2)
- Example 14 Everything was carried out in the same manner as in Example 13 except that the negative electrode prepared in Example 2 was used.
- the initial charge/discharge efficiency at this time was 81.5%.
- the discharge capacity retention rate was 86.4%.
- the electrode expansion rate was 30.4%.
- Example 15 Everything was carried out in the same manner as in Example 13 except that the negative electrode prepared in Example 3 was used.
- the initial charge/discharge efficiency at this time was 81.4%.
- the discharge capacity retention rate was 84.9%.
- the electrode expansion rate was 30.2%.
- Example 16 Everything was carried out in the same manner as in Example 13 except that the negative electrode prepared in Example 4 was used.
- the initial charge/discharge efficiency at this time was 81.6%.
- the discharge capacity retention rate was 84.7%.
- the electrode expansion rate was 31.1%.
- Example 17 Everything was carried out in the same manner as in Example 13 except that the negative electrode prepared in Example 5 was used.
- the initial charge/discharge efficiency at this time was 81.6%.
- the discharge capacity retention rate was 85.3%.
- the electrode expansion rate was 30.7%.
- Example 18 Everything was carried out in the same manner as in Example 13 except that the negative electrode prepared in Example 6 was used.
- the initial charge/discharge efficiency at this time was 82.7%.
- the discharge capacity retention rate was 85.3%.
- the electrode expansion rate was 30.6%.
- Example 19 Everything was carried out in the same manner as in Example 13 except that the negative electrode prepared in Example 7 was used.
- the initial charge/discharge efficiency at this time was 81.7%.
- the discharge capacity retention rate was 85.4%.
- the electrode expansion rate was 30.2%.
- Example 20 Everything was carried out in the same manner as in Example 13 except that the negative electrode prepared in Example 8 was used.
- the initial charge/discharge efficiency at this time was 81.5%.
- the discharge capacity retention rate was 85.0%.
- the electrode expansion rate was 30.0%.
- Example 21 Everything was carried out in the same manner as in Example 13 except that the negative electrode prepared in Example 9 was used.
- the initial charge/discharge efficiency at this time was 81.4%.
- the discharge capacity retention rate was 84.7%.
- the electrode expansion rate was 30.6%.
- Example 22 Everything was carried out in the same manner as in Example 13 except that the negative electrode prepared in Example 10 was used.
- the initial charge/discharge efficiency at this time was 81.4%.
- the discharge capacity retention rate was 84.9%.
- the electrode expansion rate was 30.0%.
- Example 23 Everything was carried out in the same manner as in Example 13 except that the negative electrode prepared in Example 11 was used.
- the initial charge/discharge efficiency at this time was 81.5%.
- the discharge capacity retention rate was 84.7%.
- the electrode expansion rate was 29.8%.
- Example 24 Everything was carried out in the same manner as in Example 13 except that the negative electrode prepared in Example 12 was used.
- the initial charge/discharge efficiency at this time was 81.4%.
- the discharge capacity retention rate was 84.9%.
- the electrode expansion rate was 30.2%.
- Example 7 The procedure of Example 13 was repeated except that the negative electrode prepared in Comparative Example 1 was used. The initial charge/discharge efficiency at this time was 81.4%. Moreover, the discharge capacity retention rate was 80.4%. Furthermore, the electrode expansion rate was 35.2%.
- Example 8 The procedure of Example 13 was repeated except that the negative electrode prepared in Comparative Example 2 was used. The initial charge/discharge efficiency at this time was 80.9%. Moreover, the discharge capacity retention rate was 72.0%. Furthermore, the electrode expansion rate was 40.3%.
- Example 9 The procedure of Example 13 was repeated except that the negative electrode prepared in Comparative Example 3 was used. The initial charge/discharge efficiency at this time was 81.3%. Moreover, the discharge capacity retention rate was 74.0%. Furthermore, the electrode expansion rate was 45.9%.
- Example 10 The procedure of Example 13 was repeated except that the negative electrode prepared in Comparative Example 4 was used. The initial charge/discharge efficiency at this time was 81.2%. Moreover, the discharge capacity retention rate was 78.5%. Furthermore, the electrode expansion rate was 36.4%.
- Example 11 The procedure of Example 13 was repeated except that the negative electrode prepared in Comparative Example 5 was used. The initial charge/discharge efficiency at this time was 80.9%. Moreover, the discharge capacity retention rate was 76.0%. Furthermore, the electrode expansion rate was 36.8%.
- Example 12 The procedure of Example 13 was repeated except that the negative electrode prepared in Comparative Example 6 was used. The initial charge/discharge efficiency at this time was 81.1%. Moreover, the discharge capacity retention rate was 79.0%. Furthermore, the electrode expansion rate was 39.3%.
- the initial charge retention rate (%), the 100th cycle capacity retention rate (%), and the electrode swelling rate (%) of the secondary batteries produced in Examples 13-24 and Comparative Examples 7-12 are shown in Table 3 below. It is as follows.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Polymers & Plastics (AREA)
- Medicinal Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
[1] 水酸基含有モノマー(a)及び酸基含有モノマー(b)を必須成分とする共重合体を含む負極バインダー組成物であって、水系GPC測定装置を用いて測定したときの前記共重合体の重量平均分子量が700,000以上であり、且つ前記負極バインダー組成物の乾燥ポリマーフィルムをカーボネート系混合溶剤(EC(エチレンカーボネート)/DEC(ジエチレンカーボネート)=50/50(wt))に45℃で72時間浸漬させた後の膨潤率が0~10重量%である負極バインダー組成物。
[2] 前記水酸基含有モノマー(a)が、前記水酸基含有モノマー(a)が、2-ヒドロキシエチルアクリレート、2-ヒドロキシプロピルアクリレート、3-ヒドロキシプロピルアクリレート、2-ヒドロキシブチルアクリレート、4-ヒドロキシブチルアクリレート、2-ヒドロキシエチルメタクリレート、2-ヒドロキシプロピルメタクリレート、3-ヒドロキシプロピルメタクリレート、2-ヒドロキシブチルメタクリレート、及び4-ヒドロキシブチルメタクリレートからなる群のうち、いずれか1種以上である[1]に記載の負極バインダー組成物。
[3] 前記酸基含有モノマー(b)が、アクリル酸、メタクリル酸、マレイン酸、モノメチルマレイン酸、2-カルボキシエチルアクリレート、2-カルボキシエチルメタクリレート、マレイン酸、及びイタコン酸からなる群のうち、いずれか1種以上である[1]又は[2]に記載の負極バインダー組成物。
[4] 前記酸基含有モノマー(b)が、塩基性組成物若しくは軽金属塩で中和されたものである[1]~[3]のいずれか一項に記載の負極バインダー組成物。
[5] 前記水酸基含有モノマー(a)の含有量が10~80重量%、且つ前記酸基含有モノマー(b)の含有量が10~80重量%である[1]~[4]のいずれか一項に記載の負極バインダー組成物。
[6] その他のモノマー(c)としてアクリルアミド、メタクリルアミド、N-メチルアクリルアミド、N,N-ジメチルアクリルアミド、及びN-ヒドロキシメチルアクリルアミドからなる群のうち、いずれか1種以上を含む[1]~[5]のいずれか一項に記載の負極バインダー組成物。
[7] 前記その他のモノマー(c)の含有量が0~80%である[6]記載の負極バインダー組成物を成分として含む負極
[8] [1]~[7]のいずれか一項に記載の負極バインダー組成物を成分として含む負極。
[9] [8]に記載の負極から構成される二次電池。
本発明の負極バインダー組成物は、水酸基含有モノマー(a)及び酸基含有モノマー(b)を必須成分とする共重合体を含む負極バインダー組成物であって、水系GPC測定装置を用いて測定したときの前記共重合体の重量平均分子量が700,000以上であり、且つ前記負極バインダー組成物の乾燥ポリマーフィルムをカーボネート系混合溶剤に45℃で72時間浸漬させた後の膨潤率が0~10重量%である。
本発明の負極は、上記負極バインダー組成物を成分として含む。本発明の負極は、上記で得られた負極バインダー組成物であるスラリーを集電体銅箔上へ塗布して薄膜として負極層を形成することで得られる。また、後述のように負極バインダー組成物であるスラリーをシート状、ペレット状等の形状に成形し、これを集電体と一体化することで負極を得てもよい。
本発明の二次電池は、上記本発明の負極を含む。本発明の二次電池は、例えば、湿式電解質二次電池に用いる場合、正極と、本発明の負極とを、セパレータを介して対向して配置し、電解液を注入することにより構成することができる。
水系GPC測定は、HPLC装置としてShimadzu/L20システムを用い、カラムはShodex OHpak SB-806MHQ(8.0mmI.D. ×300mmL.×2本)を使用した。溶離液は0.2mol/L硝酸ナトリウム水溶液を用い、試料を0.5%となるよう溶解し、φ0.45フィルターでろ過した後に測定した。試料を50μL投入し0.70mL/minの流量で流しながらRI検出器を用いて重量平均分子量を決定した。標準物質は、昭和電工製STANDARD P-82(Pullulan)を使用して検量線を作成した。
〔合成例1〕
攪拌機、温度計および冷却器、窒素ブロー装置を取り付けた1.0Lの反応容器中に、イオン交換水500.0重量部を仕込み、3時間のN2ブロー後に75℃まで加熱した。これにアクリル酸40.0重量部、2-ヒドロキシエチルアクリレート60.0重量部、過硫酸アンモニウム0.367重量部(モノマー全モル数に対して1500ppm)、イオン交換水50.0重量部の混合物を3時間かけて滴下投入し、重合反応を行った。滴下終了後同温度で2時間保った後、冷却を行った。温度40℃以下にて5mol/L水酸化ナトリウム水溶液と蒸留水加えて、pHを6.8~7.2の範囲、不揮発分を14.8重量%~15.2重量%の範囲に調整を行った。これにより得られた共重合体は、不揮発分14.8重量%、pH6.8、粘度3080mPa・s、水系GPCで測定した重量平均分子量850,000であった。
得られた共重合体溶液をPETフィルム上に塗布後、室温で3日間放置して乾燥させ、共重合体の被膜を形成した。これを剥離後1.0cm×1.0cmの正方形に切断したのち、80℃の送風乾燥機で1時間、更に110℃の真空乾燥機で10時間乾燥させた。得られた被膜の厚みは100から150μmであった。この被膜の重量を測定後、カーボネート系混合溶媒(EC(エチレンカーボネート)/DEC(ジエチレンカーボネート)=50/50(wt))に45℃、72時間浸漬したのち、再度被膜の重量を測定した。下記式(1)より算出したカーボネート混合溶剤に対する膨潤度は3.7%であった。
2-ヒドロキシエチルアクリレート60.0重量部の代わりに4-ヒドロキシブチルアクリレート60.0重量部、過硫酸アンモニウム0.332重量部(モノマー全モル数に対して1500ppm)を用いた以外は、全て合成例1と同様にして重合反応を行った。これにより得られた共重合体は、不揮発分15.1重量%、pH6.9、粘度3000mPa・s、水系GPCで測定した重量平均分子量800,000であった。また、カーボネート混合溶媒に対する膨潤度は4.3%であった。
アクリル酸40.0重量部の代わりに2-カルボキシエチルアクリレート40.0重量部、過硫酸アンモニウム0.272重量部(モノマー全モル数に対して1500ppm)を用いた以外は、全て合成例1と同様にして重合反応を行った。これにより得られた共重合体は、不揮発分14.9重量%、pH6.9、粘度3000mPa・s、水系GPCで測定した重量平均分子量840,000であった。また、カーボネート混合溶媒に対する膨潤度は3.9%であった。
攪拌機、温度計および冷却器、窒素ブローを取り付けた1.0Lの反応容器中に、イオン交換水500.0重量部、を仕込み、3時間のN2ブロー後に75℃まで加熱した。これにアクリル酸30.0重量部、2-ヒドロキシエチルアクリレート60.0重量部、アクリルアミド10.0重量部、過硫酸アンモニウム0.443重量部(モノマー全モル数に対して1500ppm)、イオン交換水の50.0重量部の混合物を3時間かけて滴下投入し、重合反応を行った。滴下終了後同温度で2時間保った後、冷却を行った。温度40℃以下にて5mol/L水酸化ナトリウム水溶液と蒸留水加えて、pHを6.8~7.2の範囲、不揮発分を14.8重量%~15.2重量%の範囲に調整を行った。得られた共重合体は、不揮発分15.1重量%、pH7.1、粘度3100mPa・s、水系GPCで測定した重量平均分子量730,000であった。また、カーボネート混合溶媒に対する膨潤度は2.9%であった。
アクリル酸20.0重量部、2-ヒドロキシエチルアクリレートの20.0重量部、アクリルアミドの60.0重量部、過硫酸アンモニウム0.405重量部(モノマー全モル数に対して1500ppm)、5mol/L水酸化ナトリウム水溶液の代わりに25%アンモニア水を用いた以外は全て合成例4と同様にして重合反応を行った。得られた共重合体は、不揮発分15.0重量%、pH7.0、粘度12500mPa・s、水系GPCで測定した重量平均分子量780,000であった。また、カーボネート混合溶媒に対する膨潤度は3.2%であった。
5mol/L水酸化ナトリウム水溶液の代わりに5mol/L水酸化リチウム水溶液を用いた以外は全て合成例5と同様にして重合反応を行った。得られた共重合体は、不揮発分15.0重量%、pH7.0、粘度13700mPa・s、水系GPCで測定した重量平均分子量780,000であった。また、カーボネート混合溶媒に対する膨潤度は3.7%であった。
25%アンモニア水の代わりに5mol/L水酸化ナトリウム水溶液を用いた以外は全て合成例5と同様にして重合反応を行った。得られた共重合体は、不揮発分15.0重量%、pH7.0、粘度13200mPa・s、水系GPCで測定した重量平均分子量780,000であった。また、カーボネート混合溶媒に対する膨潤度は3.7%であった。
アクリル酸20.0重量部、2-ヒドロキシエチルアクリレートの20.0重量部、アクリルアミドの代わりにヒドロキシメチルアクリルアミド、過硫酸アンモニウムの0.357重量部(モノマー全モル数に対して1500ppm)、5mol/L水酸化ナトリウム水溶液の代わりに25%アンモニア水を用いた以外は全て合成例4と同様にして重合反応を行った。得られた共重合体は、不揮発分15.0重量%、pH7.0、粘度17100mPa・s、水系GPCで測定した重量平均分子量830,000であった。また、カーボネート混合溶媒に対する膨潤度は3.2%であった。
アクリル酸10.0重量部、2-ヒドロキシエチルアクリレートの10.0重量部、アクリルアミドの80.0重量部、過硫酸アンモニウム0.438重量部(モノマー全モル数に対して1500ppm)、5mol/L水酸化ナトリウム水溶液の代わりに25%アンモニア水を用いた以外は全て合成例4と同様にして重合反応を行った。得られた共重合体は、不揮発分14.9重量%、pH7.0、粘度15200mPa・s、水系GPCで測定した重量平均分子量860,000であった。また、カーボネート混合溶媒に対する膨潤度は4.3%であった。
アクリル酸35.0重量部、2-ヒドロキシエチルアクリレートの35.0重量部、アクリルアミドの30.0重量部、過硫酸アンモニウム0.414重量部(モノマー全モル数に対して1500ppm)、5mol/L水酸化ナトリウム水溶液の代わりに25%アンモニア水を用いた以外は全て合成例4と同様にして重合反応を行った。得られた共重合体は、不揮発分15.0重量%、pH7.0、粘度13300mPa・s、水系GPCで測定した重量平均分子量840,000であった。また、カーボネート混合溶媒に対する膨潤度は4.2%であった。
アクリル酸20.0重量部、2-ヒドロキシエチルアクリレートの40.0重量部、アクリルアミドの40.0重量部、過硫酸アンモニウム0.442重量部(モノマー全モル数に対して1500ppm)、5mol/L水酸化ナトリウム水溶液の代わりに25%アンモニア水を用いた以外は全て合成例4と同様にして重合反応を行った。得られた共重合体は、不揮発分15.1重量%、pH7.0、粘度14500mPa・s、水系GPCで測定した重量平均分子量830,000であった。また、カーボネート混合溶媒に対する膨潤度は5.8%であった。
アクリル酸30.0重量部、2-ヒドロキシエチルアクリレートの20.0重量部、アクリルアミドの50.0重量部、過硫酸アンモニウム0.424重量部(モノマー全モル数に対して1500ppm)、5mol/L水酸化ナトリウム水溶液の代わりに25%アンモニア水を用いた以外は全て合成例4と同様にして重合反応を行った。得られた共重合体は、不揮発分15.1重量%、pH7.0、粘度13000mPa・s、水系GPCで測定した重量平均分子量840,000であった。また、カーボネート混合溶媒に対する膨潤度は3.7%であった。
3時間のN2ブロー行わなかった以外は、全て合成例1と同様にして重合反応を行った。これにより得られた共重合体は、不揮発分15.0重量%、pH6.8、粘度1380mPa・s、水系GPCで測定した重量平均分子量480,000であった。また、カーボネート混合溶媒に対する膨潤度は6.9%であった。
アクリル酸20.0重量部、2-ヒドロキシエチルアクリレート80.0重量部、過硫酸アンモニウム0.340重量部(モノマー全モル数に対して1500ppm)を用いた以外は、全て合成例1と同様にして重合反応を行った。これにより得られた共重合体は、不揮発分14.9重量%、pH7.0、粘度2800mPa・s、水系GPCで測定した重量平均分子量750,000であった。また、カーボネート混合溶媒に対する膨潤度は18.8%であった。
攪拌機、温度計および冷却器、窒素ブローを取り付けた1.0Lの反応容器中に、イオン交換水500.0重量部、を仕込み、3時間のN2ブロー後に75℃まで加熱した。これに2-ヒドロキシエチルアクリレート70.0重量部、アクリルアミド30.0重量部、過硫酸アンモニウム0.351重量部(モノマー全モル数に対して1500ppm)、イオン交換水の50.0重量部の混合物を3時間かけて滴下投入し、重合反応を行った。滴下終了後同温度で2時間保った後、冷却を行った。得られた共重合体は、不揮発分15.0重量%、pH7.0、粘度4300mPa・s、水系GPCで測定した重量平均分子量750,000であった。また、カーボネート混合溶媒に対する膨潤度は12.3%であった。
攪拌機、温度計および冷却器、窒素ブローを取り付けた1.0Lの反応容器中に、イオン交換水500.0重量部、を仕込み、3時間のN2ブロー後に75℃まで加熱した。これに2-ヒドロキシエチルアクリレート70.0重量部、アクリルアミド30.0重量部、過硫酸アンモニウム0.351重量部(モノマー全モル数に対して1500ppm)、イオン交換水の50.0重量部の混合物を3時間かけて滴下投入し、重合反応を行った。滴下終了後同温度で2時間保った後、冷却を行った。温度40℃以下にて5mol/L水酸化ナトリウム水溶液と蒸留水加えて、pHを6.8~7.2の範囲、不揮発分を14.8重量%~15.2重量%の範囲に調整を行った。得られた共重合体は、不揮発分15.0重量%、pH7.0、粘度8900mPa・s、水系GPCで測定した重量平均分子820,000であった。また、カーボネート混合溶媒に対する膨潤度は3.5%であった。
[実施例1]
(負極合剤スラリーの調製)
SiO負極材(初回充電容量2062mAh/g、初回放電容量1631mAh/g)11.5重量部、人造黒鉛(初回充電容量371mAh/g、初回放電容量346mAh/g)84.5重量部、アセチレンブラック1.0重量部、を秤取り、自転・公転ミキサー(Thinky社製ARE-310)にて、自転1000rpm、公転2000rpmの条件で、30秒攪拌した。上記合成例1に示す重合体(不揮発分14.8重量%)を蒸留水で希釈し、不揮発分濃度8.0%に調整した水溶液を、27.0重量部(固形分換算重量で2.16重量部)、蒸留水19.0重量部を加え、全体がペースト状になるまで混ぜ合わせた。次いで自転・公転ミキサー(Thinky社製ARE-310)にて、自転1000rpm、公転2000rpmの条件で、2分間攪拌し、攪拌により発熱したので氷水で室温まで冷却した。再度、自転1000rpm、公転2000rpmの条件で、2分間攪拌後、氷水で室温まで冷却した。先に不揮発分濃度8%に調製した上記合成例1に示すバインダー組成物の水溶液を、10.5重量部(不揮発分換算重量0.84重量部、)を加え、全体が均一になるまで混ぜ合わせたのち、自転・公転ミキサー(Thinky社製ARE-310)にて、自転1000rpm、公転2000rpmの条件で、2分間攪拌し、氷水で室温に冷却した。蒸留水5重量部を加え、全体が均一になるまで混ぜ合わせた。次にスラリーの粘度を調整するため、B型粘度計で粘度測定し、30rpmの条件で2000~4000Pa・sの範囲になるように蒸留水を適宜追加した。最後に自転・公転ミキサー(Thinky社製ARE-310)にて、自転1000rpm、公転2000rpmの条件で、30秒間攪拌を行って、本発明の負極バインダー組成物を用いた負極合剤スラリーを調製した。
次いで、乾燥後の負極合剤塗工量(面密度)が8.8mg/cm2になるようにバーコータのギャップを調整し、このバーコータにより負極合剤スラリーを集電体である銅箔上に塗工した。その後、80℃に設定した送風型乾燥機で8分乾燥した。乾燥した電極を幅40mmの短冊に切断し、ロールプレス機(テスター産業株式会社製 小型卓上ロールプレス SA-602)を用いて、合剤層密度が1.55g/cm3(合剤層の厚みで66.7μm)となるようにプレスした。110℃で10時間、真空乾燥したのち、合剤層密度を再度測定したところ、1.50g/cm3(合剤層の厚みで68.6μm)であった。この電極の単位面積当たりの初回充電容量は4.95mAh/cm2である。これにより、実施例1の負極(面密度8.8gm/cm2、合剤層密度1.5g/cm3、合剤層厚み68.6μm、単位面積初回充電容量4.95mAh/cm2)が得られた。
上記で作製した負極を温度25℃、相対湿度50%の恒温恒湿室内に6時間放置後、幅25mm、長さ100mmの短冊状に切り出した。ついで、両面テープ(日東電工社製 Nо5015)を用いてステンレス板に活物質面を被着面として張り合わせ、ピール強度試験用サンプルとした。銅箔端部を10mmほど引き剥がし、そこへポリイミドテープを貼り付け、剥離試験器への取り付け部とした。剥離試験機((株)島津製作所社製 オートグラフ AG-X Plus)にピール強度試験用サンプルを装着し、180度ピール試験を行った。ピール強度は34.5N/mであった。そして、負極塗膜の剥離(破壊)状態を観察した。また、負極塗膜をφ5mmの芯に巻き付け、塗膜にクラックが発生するか否かを目視観察した。このときのクラックの発生は無かった。
スラリー作製に使用したバインダー混合物を上記合成例2に示す重合体を用いた以外は実施例1と同様である。このときのピール強度は27.8N/mであった。また、クラックの発生は無かった。
スラリー作製に使用したバインダー混合物を上記合成例3に示す重合体を用いた以外は実施例1と同様である。このときのピール強度は28.9N/mであった。また、クラックの発生は無かった。
スラリー作製に使用したバインダー混合物を上記合成例4に示す重合体を用いた以外は実施例1と同様である。このときのピール強度は24.5N/mであった。また、クラックの発生は無かった。
スラリー作製に使用したバインダー混合物を上記合成例5に示す重合体を用いた以外は実施例1と同様である。このときのピール強度は30.7N/mであった。また、クラックの発生は無かった。
スラリー作製に使用したバインダー混合物を上記合成例6に示す重合体を用いた以外は実施例1と同様である。このときのピール強度は29.5N/mであった。また、クラックの発生は無かった。
スラリー作製に使用したバインダー混合物を上記合成例7に示す重合体を用いた以外は実施例1と同様である。このときのピール強度は34.6N/mであった。また、クラックの発生は無かった。
スラリー作製に使用したバインダー混合物を上記合成例8に示す重合体を用いた以外は実施例1と同様である。このときのピール強度は28.4N/mであった。また、クラックの発生は無かった。
スラリー作製に使用したバインダー混合物を上記合成例9に示す重合体を用いた以外は実施例1と同様である。このときのピール強度は29.1N/mであった。また、クラックの発生は無かった。
スラリー作製に使用したバインダー混合物を上記合成例10に示す重合体を用いた以外は実施例1と同様である。このときのピール強度は30.5N/mであった。また、クラックの発生は無かった。
スラリー作製に使用したバインダー混合物を上記合成例11に示す重合体を用いた以外は実施例1と同様である。このときのピール強度は28.6N/mであった。また、クラックの発生は無かった。
スラリー作製に使用したバインダー混合物を上記合成例12に示す重合体を用いた以外は実施例1と同様である。このときのピール強度は28.4N/mであった。また、クラックの発生は無かった。
スラリー作成に使用したバインダー混合物を上記合成例13に示す重合体を用いた以外は実施例1と同様である。このときのピール強度は17.4N/mであった。また、クラックの発生は無かった。
スラリー作成に使用したバインダー混合物を上記合成例14に示す重合体を用いた以外は実施例1と同様である。このときのピール強度は14.5N/mであった。また、クラックの発生は無かった。
スラリー作成に使用したバインダー混合物を上記合成例15に示す重合体を用いた以外は実施例1と同様である。このときのピール強度は15.2N/mであった。また、クラックの発生は無かった。
スラリー作成に使用したバインダー混合物を上記合成例16に示す重合体を用いた以外は実施例1と同様である。このときのピール強度は14.5N/mであった。また、クラックの発生は無かった。
スラリー作成に使用したバインダー混合物を上記ポリアクリル酸ナトリウム(富士フィルム和光純薬社製、重合度22000~70000)を用いた以外は実施例1と同様である。このときのピール強度は8.1N/mであった。また、クラックの発生は無かった。
(負極合剤スラリーの調製)
SiO負極材(初回充電容量2062mAh/g、初回放電容量1631mAh/g)11.5重量部、人造黒鉛(初回充電容量371mAh/g、初回放電容量346mAh/g)84.5重量部、アセチレンブラック1.0重量部、を秤取り、自転・公転ミキサー(Thinky社製ARE-310)にて、自転1000rpm、公転2000rpmの条件で、30秒攪拌した。カルボキシメチルセルロースNa塩(CMC、日本製紙社製サンローズMAC350HC)を蒸留水に溶解し、不揮発分濃度2.0%に調整した水溶液を、48.0重量部(固形分換算重量で0.96重量部)を加え、全体がペースト状になるまで混ぜ合わせた。次いで自転・公転ミキサー(Thinky社製ARE-310)にて、自転1000rpm、公転2000rpmの条件で、2分間攪拌し、攪拌により発熱したので氷水で室温まで冷却した。再度、自転1000rpm、公転2000rpmの条件で、2分間攪拌後、氷水で室温まで冷却した。先に不揮発分濃度2%に調製した上記CMCの水溶液を、27.0重量部(不揮発分換算重量0.54重量部)を加え、全体が均一になるまで混ぜ合わせたのち、自転・公転ミキサー(Thinky社製ARE-310)にて、自転1000rpm、公転2000rpmの条件で、2分間攪拌し、氷水で室温に冷却した。蒸留水を20重量部と、スチレンブタジエン共重合体(SBR)(DIC社製 DS407H, 不揮発分濃度50.8%)を2.95重量部(不揮発分換算で1.5重量部)加え、再び自転・公転ミキサー(Thinky社製ARE-310)にて、自転1000rpm、公転2000rpmの条件で、30秒間攪拌することで負極合剤スラリーを調製した。負極の作製、ピール強度の測定及び、電極の巻回耐性の確認は実施例1と同様にして行った。このときのピール強度は16.8N/mであった。また、クラックの発生は無かった。
(正極スラリーの調製)
湿度30%以下に調整した室内で、正極材LiMn0.6Co0.2Ni0.2O2 (初回充電容量191mAh/g、初回放電容量171mAh/g)94.0重量部、アセチレンブラック3.0重量部、を秤取り、自転・公転ミキサー(Thinky社製ARE-310)にて、自転1000rpm、公転2000rpmの条件で、30秒攪拌した。不揮発分濃度8.0%に調整したポリフッ化ビニリデンの無水N-メチルピロリドン溶液を、27.0重量部(固形分換算重量で2.16重量部)、無水N-メチルピロリドン19.0重量部を加え、全体がペースト状になるまで混ぜ合わせた。次いで自転・公転ミキサー(Thinky社製ARE-310)にて、自転1000rpm、公転2000rpmの条件で、2分間攪拌し、攪拌により発熱したので氷水で室温まで冷却した。再度、自転1000rpm、公転2000rpmの条件で、2分間攪拌後、氷水で室温まで冷却した。先に不揮発分濃度8%に調製したポリフッ化ビニリデンの無水N-メチルピロリドン溶液を、10.5重量部(不揮発分換算重量0.84重量部、)を加え、全体が均一になるまで混ぜ合わせたのち、自転・公転ミキサー(Thinky社製ARE-310)にて、自転1000rpm、公転2000rpmの条件で、2分間攪拌し、氷水で室温に冷却した。無水N-メチルピロリドン5重量部を加え、全体が均一になるまで混ぜ合わせた。次にスラリーの粘度を調整するため、B型粘度計で粘度測定し、30rpmの条件で2000~4000Pa・sの範囲になるように無水N-メチルピロリドンを適宜追加した。最後に自転・公転ミキサー(Thinky社製ARE-310)にて、自転1000rpm、公転2000rpmの条件で、30秒間攪拌を行って、正極合剤スラリーを調製した。
まず、乾燥後の合剤塗工量(面密度)が25.0mg/cm2になるようにバーコータのギャップを調整し、このバーコータにより正極合剤スラリーを集電体であるアルミニウム箔上に塗工した。次に、80℃に設定した送風型乾燥機で10分乾燥した。乾燥した電極を幅40mmの短冊に切断し、ロールプレス機(テスター産業株式会社製 小型卓上ロールプレス SA-602)を用いて、合剤層密度が3.4g/cm3(合剤層の厚みで73.3μm)となるようにプレスしたのち、110℃で10時間、真空乾燥した。この電極の単位面積当たりの初回充電容量は4.49mAh/cm2である。これにより、正極(面密度25.0gm/cm2、合剤層密度3.4g/cm3、合剤層厚み73.3μm、単位面積初回充電容量4.49mAh/cm2)が得られた。
[実施例13]
まず、実施例1で示した負極をTabの付いた24mm×24mmの正方形に、正極作成例で示した正極をTabの付いた22mm×22mmの正方形にトムソン刃を用いて各々カットした。カットした電極のTab部に負極はニッケル、正極はアルミのタブリードを各々溶接した。次に、セパレータ(厚み25ミクロンのポリエチレン製微多孔膜)を28mm×3.8cmの長方形にトムソン刃を用いてカットした。セパレータを介して正極と負極を対向させ、ラミネートフィルムで包装し、Tab部を熱圧着により固定した。そして、電解液(1.0MのLiPF6 エチレンカーボネート/ジメチルカーボネート/メチルエチルカーボネート=30/30/40混合溶液(体積比)+1%ビニルカーボネート+5%フルオロエチレンカーボネート)を300μL加え、真空ラミネートすることで完全に封じ、ラミネート型二次電池を作製した。
上記で作製した二次電池を充放電装置に取り付け、25℃で3時間放置後、0.1Cで1回充放電した。このときの初回充放電効率は81.2%であった。次に0.2Cで50回充放電を繰り返した。0.2C1回目の放電容量を100%とした時の50回目の放電容量維持率は85.0%であった。
初回充放電後、45℃に保持し、0.5Cで1回充電を行ったのち、ドライルーム内で二次電池を解体し、満充電状態の負極を取り出した。ジメチルカーボネートで洗浄、自然乾燥後、マイクロメータにて電極厚みを測定した。下記(式2)より電極膨潤率を算出した結果、32.0%であった。
上記実施例2で作製した負極を用いた以外は全て実施例13と同様に行った。このときの初回充放電効率は81.5%であった。また、放電容量維持率は86.4%であった。さらに電極膨張率は30.4%であった。
上記実施例3で作製した負極を用いた以外は全て実施例13と同様に行った。このときの初回充放電効率は81.4%であった。また、放電容量維持率は84.9%であった。さらに電極膨張率は30.2%であった。
上記実施例4で作製した負極を用いた以外は全て実施例13と同様に行った。このときの初回充放電効率は81.6%であった。また、放電容量維持率は84.7%であった。さらに電極膨張率は31.1%であった。
上記実施例5で作製した負極を用いた以外は全て実施例13と同様に行った。このときの初回充放電効率は81.6%であった。また、放電容量維持率は85.3%であった。さらに電極膨張率は30.7%であった。
上記実施例6で作製した負極を用いた以外は全て実施例13と同様に行った。このときの初回充放電効率は82.7%であった。また、放電容量維持率は85.3%であった。さらに電極膨張率は30.6%であった。
上記実施例7で作製した負極を用いた以外は全て実施例13と同様に行った。このときの初回充放電効率は81.7%であった。また、放電容量維持率は85.4%であった。さらに電極膨張率は30.2%であった。
上記実施例8で作製した負極を用いた以外は全て実施例13と同様に行った。このときの初回充放電効率は81.5%であった。また、放電容量維持率は85.0%であった。さらに電極膨張率は30.0%であった。
上記実施例9で作製した負極を用いた以外は全て実施例13と同様に行った。このときの初回充放電効率は81.4%であった。また、放電容量維持率は84.7%であった。さらに電極膨張率は30.6%であった。
上記実施例10で作製した負極を用いた以外は全て実施例13と同様に行った。このときの初回充放電効率は81.4%であった。また、放電容量維持率は84.9%であった。さらに電極膨張率は30.0%であった。
上記実施例11で作製した負極を用いた以外は全て実施例13と同様に行った。このときの初回充放電効率は81.5%であった。また、放電容量維持率は84.7%であった。さらに電極膨張率は29.8%であった。
上記実施例12で作製した負極を用いた以外は全て実施例13と同様に行った。このときの初回充放電効率は81.4%であった。また、放電容量維持率は84.9%であった。さらに電極膨張率は30.2%であった。
上記比較例1で作製した負極を用いた以外は全て実施例13と同様に行った。このときの初回充放電効率は81.4%であった。また、放電容量維持率は80.4%であった。さらに電極膨張率は35.2%であった。
上記比較例2で作製した負極を用いた以外は全て実施例13と同様に行った。このときの初回充放電効率は80.9%であった。また、放電容量維持率は72.0%であった。さらに電極膨張率は40.3%であった。
上記比較例3で作製した負極を用いた以外は全て実施例13と同様に行った。このときの初回充放電効率は81.3%であった。また、放電容量維持率74.0%であった。さらに電極膨張率は45.9%であった。
上記比較例4で作製した負極を用いた以外は全て実施例13と同様に行った。このときの初回充放電効率は81.2%であった。また、放電容量維持率は78.5%であった。さらに電極膨張率は36.4%であった。
上記比較例5で作製した負極を用いた以外は全て実施例13と同様に行った。このときの初回充放電効率は80.9%であった。また、放電容量維持率は76.0%であった。さらに電極膨張率は36.8%であった。
上記比較例6で作製した負極を用いた以外は全て実施例13と同様に行った。このときの初回充放電効率は81.1%であった。また、放電容量維持率は79.0%であった。さらに電極膨張率は39.3%であった。
Claims (9)
- 水酸基含有モノマー(a)及び酸基含有モノマー(b)を必須成分とする共重合体を含む負極バインダー組成物であって、水系GPC測定装置を用いて測定したときの前記共重合体の重量平均分子量が700,000以上であり、且つ前記負極バインダー組成物の乾燥ポリマーフィルムをカーボネート系混合溶剤(EC(エチレンカーボネート)/DEC(ジエチレンカーボネート)=50/50(wt))に45℃で72時間浸漬させた後の膨潤率が0~10重量%である負極バインダー組成物。
- 前記水酸基含有モノマー(a)が、前記水酸基含有モノマー(a)が、2-ヒドロキシエチルアクリレート、2-ヒドロキシプロピルアクリレート、3-ヒドロキシプロピルアクリレート、2-ヒドロキシブチルアクリレート、4-ヒドロキシブチルアクリレート、2-ヒドロキシエチルメタクリレート、2-ヒドロキシプロピルメタクリレート、3-ヒドロキシプロピルメタクリレート、2-ヒドロキシブチルメタクリレート、及び4-ヒドロキシブチルメタクリレートからなる群のうち、いずれか1種以上である請求項1に記載の負極バインダー組成物。
- 前記酸基含有モノマー(b)が、アクリル酸、メタクリル酸、マレイン酸、モノメチルマレイン酸、2-カルボキシエチルアクリレート、2-カルボキシエチルメタクリレート、マレイン酸、及びイタコン酸からなる群のうち、いずれか1種以上である請求項1又は2に記載の負極バインダー組成物。
- 前記酸基含有モノマー(b)が、塩基性組成物若しくは軽金属塩で中和されたものである請求項1~3のいずれか一項に記載の負極バインダー組成物。
- 前記水酸基含有モノマー(a)の含有量が10~80重量%、且つ前記酸基含有モノマー(b)の含有量が10~80重量%である請求項1~4のいずれか一項に記載の負極バインダー組成物。
- さらにその他のモノマー(c)として、アクリルアミド、メタクリルアミド、N-メチルアクリルアミド、N,N-ジメチルアクリルアミド、及びN-ヒドロキシメチルアクリルアミドからなる群のうち、いずれか1種以上を含む請求項1~5のいずれか一項に記載の負極バインダー組成物。
- 前記その他のモノマー(c)の含有量が0~80%である請求項6記載の負極バインダー組成物。
- 請求項1~7のいずれか一項に記載の負極バインダー組成物を成分として含む負極。
- 請求項8に記載の負極から構成される二次電池。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2022580589A JP7311059B2 (ja) | 2021-02-09 | 2022-02-03 | 負極バインダー組成物、負極、及び二次電池 |
EP22752670.4A EP4293053A1 (en) | 2021-02-09 | 2022-02-03 | Negative electrode binder composition, negative electrode, and secondary battery |
KR1020237025065A KR20230145324A (ko) | 2021-02-09 | 2022-02-03 | 음극 바인더 조성물, 음극, 및 이차 전지 |
US18/262,279 US20240105949A1 (en) | 2021-02-09 | 2022-02-03 | Negative electrode binder composition, negative electrode, and secondary battery |
CN202280011038.1A CN116830318A (zh) | 2021-02-09 | 2022-02-03 | 负极粘合剂组合物、负极和二次电池 |
JP2023096841A JP2023116666A (ja) | 2021-02-09 | 2023-06-13 | 負極バインダー組成物、負極、及び二次電池 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021018890 | 2021-02-09 | ||
JP2021-018890 | 2021-02-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022172843A1 true WO2022172843A1 (ja) | 2022-08-18 |
Family
ID=82837806
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2022/004168 WO2022172843A1 (ja) | 2021-02-09 | 2022-02-03 | 負極バインダー組成物、負極、及び二次電池 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20240105949A1 (ja) |
EP (1) | EP4293053A1 (ja) |
JP (2) | JP7311059B2 (ja) |
KR (1) | KR20230145324A (ja) |
CN (1) | CN116830318A (ja) |
WO (1) | WO2022172843A1 (ja) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003157851A (ja) * | 2001-08-30 | 2003-05-30 | Hitachi Chem Co Ltd | 熱硬化性ポリビニルアルコール系バインダ樹脂組成物、合剤スラリー、電極、非水電解液系二次電池及び電極材料用の熱硬化性ポリビニルアルコール系バインダ樹脂 |
WO2015186363A1 (ja) * | 2014-06-04 | 2015-12-10 | 日本ゼオン株式会社 | リチウムイオン二次電池電極用バインダー組成物、リチウムイオン二次電池電極用スラリー組成物、リチウムイオン二次電池用電極およびリチウムイオン二次電池 |
WO2016067633A1 (ja) * | 2014-10-31 | 2016-05-06 | 日本ゼオン株式会社 | リチウムイオン二次電池負極用ペースト組成物、リチウムイオン二次電池負極用複合粒子、リチウムイオン二次電池負極用スラリー組成物、リチウムイオン二次電池用負極およびリチウムイオン二次電池 |
JP2016149313A (ja) * | 2015-02-13 | 2016-08-18 | 日本ゼオン株式会社 | リチウムイオン二次電池電極用バインダー組成物、リチウムイオン二次電池電極用スラリー組成物、リチウムイオン二次電池用電極およびリチウムイオン二次電池 |
WO2017056467A1 (ja) * | 2015-09-30 | 2017-04-06 | 日本ゼオン株式会社 | 非水系二次電池電極用バインダー組成物、非水系二次電池電極用スラリー組成物、非水系二次電池用電極、及び非水系二次電池 |
WO2018030002A1 (ja) * | 2016-08-10 | 2018-02-15 | Necエナジーデバイス株式会社 | リチウムイオン電池用電極およびリチウムイオン電池 |
WO2019167730A1 (ja) * | 2018-02-27 | 2019-09-06 | 日本ゼオン株式会社 | リチウムイオン二次電池用スラリー組成物およびリチウムイオン二次電池用電極 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI671940B (zh) | 2012-10-26 | 2019-09-11 | 日商富士軟片和光純藥股份有限公司 | 鋰電池用結合劑 |
JP2016149312A (ja) | 2015-02-13 | 2016-08-18 | ソニー株式会社 | 二次電池、電池パック、電動車両、電力貯蔵システム、電動工具および電子機器 |
JP6648854B2 (ja) | 2019-06-06 | 2020-02-14 | 宇部興産株式会社 | 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 |
-
2022
- 2022-02-03 JP JP2022580589A patent/JP7311059B2/ja active Active
- 2022-02-03 KR KR1020237025065A patent/KR20230145324A/ko unknown
- 2022-02-03 WO PCT/JP2022/004168 patent/WO2022172843A1/ja active Application Filing
- 2022-02-03 US US18/262,279 patent/US20240105949A1/en active Pending
- 2022-02-03 CN CN202280011038.1A patent/CN116830318A/zh active Pending
- 2022-02-03 EP EP22752670.4A patent/EP4293053A1/en active Pending
-
2023
- 2023-06-13 JP JP2023096841A patent/JP2023116666A/ja active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003157851A (ja) * | 2001-08-30 | 2003-05-30 | Hitachi Chem Co Ltd | 熱硬化性ポリビニルアルコール系バインダ樹脂組成物、合剤スラリー、電極、非水電解液系二次電池及び電極材料用の熱硬化性ポリビニルアルコール系バインダ樹脂 |
WO2015186363A1 (ja) * | 2014-06-04 | 2015-12-10 | 日本ゼオン株式会社 | リチウムイオン二次電池電極用バインダー組成物、リチウムイオン二次電池電極用スラリー組成物、リチウムイオン二次電池用電極およびリチウムイオン二次電池 |
WO2016067633A1 (ja) * | 2014-10-31 | 2016-05-06 | 日本ゼオン株式会社 | リチウムイオン二次電池負極用ペースト組成物、リチウムイオン二次電池負極用複合粒子、リチウムイオン二次電池負極用スラリー組成物、リチウムイオン二次電池用負極およびリチウムイオン二次電池 |
JP2016149313A (ja) * | 2015-02-13 | 2016-08-18 | 日本ゼオン株式会社 | リチウムイオン二次電池電極用バインダー組成物、リチウムイオン二次電池電極用スラリー組成物、リチウムイオン二次電池用電極およびリチウムイオン二次電池 |
WO2017056467A1 (ja) * | 2015-09-30 | 2017-04-06 | 日本ゼオン株式会社 | 非水系二次電池電極用バインダー組成物、非水系二次電池電極用スラリー組成物、非水系二次電池用電極、及び非水系二次電池 |
WO2018030002A1 (ja) * | 2016-08-10 | 2018-02-15 | Necエナジーデバイス株式会社 | リチウムイオン電池用電極およびリチウムイオン電池 |
WO2019167730A1 (ja) * | 2018-02-27 | 2019-09-06 | 日本ゼオン株式会社 | リチウムイオン二次電池用スラリー組成物およびリチウムイオン二次電池用電極 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2022172843A1 (ja) | 2022-08-18 |
JP7311059B2 (ja) | 2023-07-19 |
EP4293053A1 (en) | 2023-12-20 |
KR20230145324A (ko) | 2023-10-17 |
CN116830318A (zh) | 2023-09-29 |
JP2023116666A (ja) | 2023-08-22 |
US20240105949A1 (en) | 2024-03-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP2022140477A (ja) | 非水系電池電極用バインダー用共重合体、非水系電池電極用スラリー、非水系電池電極、および非水系電池 | |
JP7170330B2 (ja) | 二次電池用負極及び二次電池 | |
EP4024533B1 (en) | Binder composition and preparation method for secondary battery | |
JP2971451B1 (ja) | リチウム二次電池 | |
KR102230563B1 (ko) | 전극 바인더용 공중합체 및 리튬 이온 이차 전지 | |
WO2022141508A1 (zh) | 一种电化学装置和电子装置 | |
WO2019156031A1 (ja) | リチウムイオン二次電池用電極、その製造方法、及びリチウムイオン二次電池 | |
TWI795390B (zh) | 非水電解質電池用黏合劑組成物、以及使用其之非水電解質電池用黏合劑水溶液、非水電解質電池用漿體組成物、非水電解質電池用電極、及非水電解質電池 | |
JP2019175657A (ja) | リチウムイオン二次電池。 | |
WO2015115201A1 (ja) | 電気化学素子用電極及び電気化学素子 | |
JP5707804B2 (ja) | 非水電解質二次電池正極用スラリー組成物 | |
KR20110047175A (ko) | 폴리아크릴로니트릴-아크릴산 공중합체 및 바인더를 포함한 음극 재료 조성물의 제조방법 및 그 음극 재료 조성물을 포함하는 리튬 이차 전지용 음극의 제조방법 | |
JP5232353B2 (ja) | 非水電解質二次電池用電極組成物、これを用いた電極および電池 | |
KR20210032386A (ko) | 비수계 전지 전극용 바인더용 공중합체, 및 비수계 전지 전극 제조용 슬러리 | |
US10431813B2 (en) | Carbon-silicon composite structure and method of preparing the same | |
JP7311059B2 (ja) | 負極バインダー組成物、負極、及び二次電池 | |
US20230223540A1 (en) | Binder for nonaqueous secondary battery electrode and slurry for nonaqueous secondary battery electrode | |
KR101623637B1 (ko) | 전극용 슬러리 조성물 및 리튬이온 이차전지 | |
JP7359337B1 (ja) | 負極バインダー組成物およびその製造方法、負極、及び二次電池 | |
KR101616721B1 (ko) | 접착력이 향상된 바인더 및 상기 바인더를 포함하는 리튬 이차전지 | |
WO2023199657A1 (ja) | 負極バインダー組成物およびその製造方法、負極、及び二次電池 | |
JP7245100B2 (ja) | リチウムイオン二次電池 | |
WO2024077507A1 (zh) | 粘结组合物、电极浆料、电极极片、二次电池及用电装置 | |
JPH0927313A (ja) | 非水電解液二次電池 | |
WO2021193665A1 (ja) | 二次電池用正極及び二次電池 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22752670 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2022580589 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 18262279 Country of ref document: US Ref document number: 202280011038.1 Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2022752670 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 2022752670 Country of ref document: EP Effective date: 20230911 |