WO2020246081A1 - 蓄電デバイス及びリチウムイオン二次電池の製造方法 - Google Patents
蓄電デバイス及びリチウムイオン二次電池の製造方法 Download PDFInfo
- Publication number
- WO2020246081A1 WO2020246081A1 PCT/JP2020/007734 JP2020007734W WO2020246081A1 WO 2020246081 A1 WO2020246081 A1 WO 2020246081A1 JP 2020007734 W JP2020007734 W JP 2020007734W WO 2020246081 A1 WO2020246081 A1 WO 2020246081A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- negative electrode
- active material
- material layer
- positive electrode
- electrode active
- Prior art date
Links
- 238000003860 storage Methods 0.000 title claims abstract description 151
- 238000004519 manufacturing process Methods 0.000 title claims description 56
- 238000000034 method Methods 0.000 title claims description 55
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims description 50
- 229910001416 lithium ion Inorganic materials 0.000 title claims description 50
- 239000007773 negative electrode material Substances 0.000 claims abstract description 154
- 239000007774 positive electrode material Substances 0.000 claims abstract description 141
- 239000008151 electrolyte solution Substances 0.000 claims description 121
- 229910052744 lithium Inorganic materials 0.000 claims description 107
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 89
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 26
- 239000002245 particle Substances 0.000 claims description 23
- 239000002210 silicon-based material Substances 0.000 claims description 13
- 239000003575 carbonaceous material Substances 0.000 claims description 12
- 239000010439 graphite Substances 0.000 claims description 12
- 229910002804 graphite Inorganic materials 0.000 claims description 12
- 229910021385 hard carbon Inorganic materials 0.000 claims description 8
- 229910021384 soft carbon Inorganic materials 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 3
- 239000003792 electrolyte Substances 0.000 abstract description 13
- 230000014509 gene expression Effects 0.000 abstract 4
- 239000002243 precursor Substances 0.000 description 49
- 239000000243 solution Substances 0.000 description 27
- -1 inorganic acid compounds Chemical class 0.000 description 26
- 239000011347 resin Substances 0.000 description 24
- 229920005989 resin Polymers 0.000 description 24
- 230000032258 transport Effects 0.000 description 24
- 238000012546 transfer Methods 0.000 description 22
- 229910052783 alkali metal Inorganic materials 0.000 description 21
- 150000001340 alkali metals Chemical class 0.000 description 20
- 238000004140 cleaning Methods 0.000 description 20
- 239000011267 electrode slurry Substances 0.000 description 20
- 238000005192 partition Methods 0.000 description 20
- 239000000463 material Substances 0.000 description 17
- 238000001556 precipitation Methods 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 16
- 238000011156 evaluation Methods 0.000 description 15
- 230000009467 reduction Effects 0.000 description 13
- 238000005259 measurement Methods 0.000 description 12
- 239000003960 organic solvent Substances 0.000 description 12
- 239000002585 base Substances 0.000 description 11
- 239000002904 solvent Substances 0.000 description 11
- 239000011149 active material Substances 0.000 description 10
- 229910003002 lithium salt Inorganic materials 0.000 description 10
- 159000000002 lithium salts Chemical class 0.000 description 10
- 239000007789 gas Substances 0.000 description 9
- 239000007788 liquid Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 239000011230 binding agent Substances 0.000 description 8
- 238000001914 filtration Methods 0.000 description 8
- 230000003647 oxidation Effects 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 8
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 7
- 229920003026 Acene Polymers 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 230000001186 cumulative effect Effects 0.000 description 7
- 229920001971 elastomer Polymers 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 6
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 6
- 239000004743 Polypropylene Substances 0.000 description 6
- 238000007600 charging Methods 0.000 description 6
- 239000004020 conductor Substances 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 229920000573 polyethylene Polymers 0.000 description 6
- 229920001155 polypropylene Polymers 0.000 description 6
- 229910013870 LiPF 6 Inorganic materials 0.000 description 5
- 229910001413 alkali metal ion Inorganic materials 0.000 description 5
- 238000007599 discharging Methods 0.000 description 5
- 239000000806 elastomer Substances 0.000 description 5
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 5
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 5
- 238000010030 laminating Methods 0.000 description 5
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 5
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 4
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 239000006230 acetylene black Substances 0.000 description 4
- 239000000010 aprotic solvent Substances 0.000 description 4
- 150000001721 carbon Chemical group 0.000 description 4
- 229920002678 cellulose Polymers 0.000 description 4
- 239000001913 cellulose Substances 0.000 description 4
- 150000005678 chain carbonates Chemical class 0.000 description 4
- 150000005676 cyclic carbonates Chemical class 0.000 description 4
- 230000002950 deficient Effects 0.000 description 4
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 4
- 125000001153 fluoro group Chemical group F* 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 230000002427 irreversible effect Effects 0.000 description 4
- 239000004745 nonwoven fabric Substances 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000013585 weight reducing agent Substances 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 description 3
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 3
- 229920000297 Rayon Polymers 0.000 description 3
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 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
- 150000001450 anions Chemical class 0.000 description 3
- 238000009835 boiling Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000011246 composite particle Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000002484 cyclic voltammetry Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 239000012046 mixed solvent Substances 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 3
- 239000002964 rayon Substances 0.000 description 3
- 239000002409 silicon-based active material Substances 0.000 description 3
- 229910001415 sodium ion Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000002562 thickening agent Substances 0.000 description 3
- 229910000314 transition metal oxide Inorganic materials 0.000 description 3
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 2
- ZZXUZKXVROWEIF-UHFFFAOYSA-N 1,2-butylene carbonate Chemical compound CCC1COC(=O)O1 ZZXUZKXVROWEIF-UHFFFAOYSA-N 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 229910000733 Li alloy Inorganic materials 0.000 description 2
- 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 2
- 239000004677 Nylon Substances 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 108010000020 Platelet Factor 3 Proteins 0.000 description 2
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 150000001299 aldehydes Chemical class 0.000 description 2
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 150000001733 carboxylic acid esters Chemical class 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010277 constant-current charging Methods 0.000 description 2
- 239000007771 core particle Substances 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 150000004292 cyclic ethers Chemical class 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- FKRCODPIKNYEAC-UHFFFAOYSA-N ethyl propionate Chemical compound CCOC(=O)CC FKRCODPIKNYEAC-UHFFFAOYSA-N 0.000 description 2
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 description 2
- 239000002391 graphite-based active material Substances 0.000 description 2
- 239000002608 ionic liquid Substances 0.000 description 2
- 239000001989 lithium alloy Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000011255 nonaqueous electrolyte Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- ZUHZGEOKBKGPSW-UHFFFAOYSA-N tetraglyme Chemical compound COCCOCCOCCOCCOC ZUHZGEOKBKGPSW-UHFFFAOYSA-N 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 description 1
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 description 1
- WNXJIVFYUVYPPR-UHFFFAOYSA-N 1,3-dioxolane Chemical compound C1COCO1 WNXJIVFYUVYPPR-UHFFFAOYSA-N 0.000 description 1
- SNAQINZKMQFYFV-UHFFFAOYSA-N 1-[2-[2-(2-methoxyethoxy)ethoxy]ethoxy]butane Chemical compound CCCCOCCOCCOCCOC SNAQINZKMQFYFV-UHFFFAOYSA-N 0.000 description 1
- CNJRPYFBORAQAU-UHFFFAOYSA-N 1-ethoxy-2-(2-methoxyethoxy)ethane Chemical compound CCOCCOCCOC CNJRPYFBORAQAU-UHFFFAOYSA-N 0.000 description 1
- MBDUIEKYVPVZJH-UHFFFAOYSA-N 1-ethylsulfonylethane Chemical compound CCS(=O)(=O)CC MBDUIEKYVPVZJH-UHFFFAOYSA-N 0.000 description 1
- BURXUZQXZYGEGR-UHFFFAOYSA-N 1-fluoroethyl hydrogen carbonate Chemical compound CC(F)OC(O)=O BURXUZQXZYGEGR-UHFFFAOYSA-N 0.000 description 1
- FALRKNHUBBKYCC-UHFFFAOYSA-N 2-(chloromethyl)pyridine-3-carbonitrile Chemical compound ClCC1=NC=CC=C1C#N FALRKNHUBBKYCC-UHFFFAOYSA-N 0.000 description 1
- QTWJRLJHJPIABL-UHFFFAOYSA-N 2-methylphenol;3-methylphenol;4-methylphenol Chemical compound CC1=CC=C(O)C=C1.CC1=CC=CC(O)=C1.CC1=CC=CC=C1O QTWJRLJHJPIABL-UHFFFAOYSA-N 0.000 description 1
- BJWMSGRKJIOCNR-UHFFFAOYSA-N 4-ethenyl-1,3-dioxolan-2-one Chemical compound C=CC1COC(=O)O1 BJWMSGRKJIOCNR-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 1
- 244000043261 Hevea brasiliensis 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
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- NQRYJNQNLNOLGT-UHFFFAOYSA-N Piperidine Chemical group C1CCNCC1 NQRYJNQNLNOLGT-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical group C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- KFDQGLPGKXUTMZ-UHFFFAOYSA-N [Mn].[Co].[Ni] Chemical compound [Mn].[Co].[Ni] KFDQGLPGKXUTMZ-UHFFFAOYSA-N 0.000 description 1
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical class [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 description 1
- PWBXDCPGSHVVPB-UHFFFAOYSA-K [O-]P([O-])(=O)OP(=O)([O-])O.[Fe+2].[Li+] Chemical compound [O-]P([O-])(=O)OP(=O)([O-])O.[Fe+2].[Li+] PWBXDCPGSHVVPB-UHFFFAOYSA-K 0.000 description 1
- IKHGUXGNUITLKF-XPULMUKRSA-N acetaldehyde Chemical compound [14CH]([14CH3])=O IKHGUXGNUITLKF-XPULMUKRSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229920000800 acrylic rubber Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000003660 carbonate based solvent Substances 0.000 description 1
- LEGITHRSIRNTQV-UHFFFAOYSA-N carbonic acid;3,3,3-trifluoroprop-1-ene Chemical compound OC(O)=O.FC(F)(F)C=C LEGITHRSIRNTQV-UHFFFAOYSA-N 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical class [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 238000010281 constant-current constant-voltage charging Methods 0.000 description 1
- 150000001879 copper Chemical class 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 229930003836 cresol Natural products 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 125000004093 cyano group Chemical group *C#N 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 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
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003759 ester based solvent Substances 0.000 description 1
- 239000004210 ether based solvent Substances 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 239000011888 foil Substances 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
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 150000004693 imidazolium salts Chemical group 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229920003049 isoprene rubber Polymers 0.000 description 1
- 239000003273 ketjen black Substances 0.000 description 1
- 239000005453 ketone based solvent Substances 0.000 description 1
- 239000011244 liquid electrolyte Substances 0.000 description 1
- DMEJJWCBIYKVSB-UHFFFAOYSA-N lithium vanadium Chemical compound [Li].[V] DMEJJWCBIYKVSB-UHFFFAOYSA-N 0.000 description 1
- ACFSQHQYDZIPRL-UHFFFAOYSA-N lithium;bis(1,1,2,2,2-pentafluoroethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)C(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)C(F)(F)F ACFSQHQYDZIPRL-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- AMWRITDGCCNYAT-UHFFFAOYSA-L manganese oxide Inorganic materials [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 1
- PPNAOCWZXJOHFK-UHFFFAOYSA-N manganese(2+);oxygen(2-) Chemical class [O-2].[Mn+2] PPNAOCWZXJOHFK-UHFFFAOYSA-N 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 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
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical class [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- FFZANLXOAFSSGC-UHFFFAOYSA-N phosphide(1-) Chemical compound [P-] FFZANLXOAFSSGC-UHFFFAOYSA-N 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 229940014800 succinic anhydride Drugs 0.000 description 1
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- YFNKIDBQEZZDLK-UHFFFAOYSA-N triglyme Chemical compound COCCOCCOCCOC YFNKIDBQEZZDLK-UHFFFAOYSA-N 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- 238000004832 voltammetry Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 125000002256 xylenyl group Chemical class C1(C(C=CC=C1)C)(C)* 0.000 description 1
Images
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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/26—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features
- H01G11/28—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/32—Carbon-based
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/50—Electrodes characterised by their material specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
- H01G11/86—Processes for the manufacture of hybrid or EDL capacitors, or components thereof specially adapted for electrodes
-
- 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/366—Composites as layered products
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/483—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides for non-aqueous cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/26—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/46—Metal oxides
-
- 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
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present disclosure relates to a method for manufacturing a power storage device and a lithium ion secondary battery.
- Non-aqueous electrolyte secondary batteries have been developed to meet the demands for miniaturization and weight reduction of batteries.
- the non-aqueous electrolyte secondary battery include a lithium ion secondary battery and the like.
- a lithium ion capacitor is known as a power storage device corresponding to an application requiring high energy density characteristics and high output characteristics.
- sodium ion type batteries and capacitors are also known. Sodium is cheaper and more resource-rich than lithium.
- pre-doping a process of pre-doping an alkali metal into an electrode active material is adopted for various purposes.
- the process of pre-doping an alkali metal into an electrode active material is called pre-doping.
- lithium is predoped for the purpose of lowering the negative electrode potential and increasing the energy density.
- the pre-doping method in this case is mainly a method of pre-doping the negative electrode active material in the cell by using a current collector having through holes. This method is described in, for example, Patent Document 1.
- predoping is performed for the purpose of reducing the irreversible capacity of the negative electrode.
- a pre-doping method in addition to the above method, a method of pre-doping the negative electrode active material before assembling the battery is known. This method is described, for example, in Patent Documents 2 and 3. Further, also in the case of manufacturing a sodium ion type power storage device, a method of predoping sodium to the negative electrode before assembling the power storage device is adopted. This method is described, for example, in Patent Document 4.
- One aspect of the present disclosure is a power storage device comprising an electrode unit including a positive electrode, a separator, and a negative electrode, and an electrolytic solution, wherein the negative electrode is doped with lithium, and the negative electrode is a negative electrode current collector.
- the positive electrode includes a negative electrode active material layer formed on the surface of the negative electrode current collector, and the positive electrode includes a positive electrode current collector and a positive electrode active material layer formed on the surface of the positive electrode current collector.
- the negative electrode active material layer includes a surplus region A that does not face the positive electrode active material layer, and the positive electrode active material layer from the end of the positive electrode active material layer to the center to the end of the positive electrode active material layer.
- the positive electrode has an end region B facing a region extending in the central direction and a central region C other than the surplus region A and the end region B by a length of 5% of the length.
- the negative electrode potential VA of the surplus region A after the negative electrode is short-circuited and the negative electrode potential VC of the central region C after the positive electrode and the negative electrode are short-circuited are the following equations (1) to (1). It is a power storage device that satisfies 3).
- the power storage device which is one aspect of the present disclosure, can suppress the precipitation of lithium from the negative electrode and has excellent characteristics.
- a power storage device comprising an electrode unit including a positive electrode, a separator, and a negative electrode, and an electrolytic solution, wherein the negative electrode is doped with lithium, and the negative electrode is a negative electrode current collector.
- a negative electrode active material layer formed on the surface of the negative electrode current collector, and the positive electrode includes a positive electrode current collector and a positive electrode active material layer formed on the surface of the positive electrode current collector.
- the negative electrode active material layer has a surplus region A that does not face the positive electrode active material layer, and of the positive electrode active material layer, from the end of the positive electrode active material layer to the center to the end of the positive electrode active material layer.
- the power storage device has an end region B facing the region extending in the central direction and a central region C other than the surplus region A and the end region B by a length of 5% of the length of the above, and is in a charged state.
- the power storage device which is another aspect of the present disclosure, can suppress the precipitation of lithium from the negative electrode and has excellent characteristics.
- a power storage device comprising an electrode unit including a positive electrode, a separator, and a negative electrode, and an electrolytic solution, wherein the negative electrode is doped with lithium, and the negative electrode is a negative electrode current collector.
- a negative electrode active material layer formed on the surface of the negative electrode current collector, and the positive electrode includes a positive electrode current collector and a positive electrode active material layer formed on the surface of the positive electrode current collector.
- the negative electrode active material layer has a surplus region A that does not face the positive electrode active material layer, and of the positive electrode active material layer, from the end of the positive electrode active material layer to the center to the end of the positive electrode active material layer.
- the power storage device which is another aspect of the present disclosure, can suppress the precipitation of lithium from the negative electrode and has excellent characteristics.
- Another aspect of the present disclosure is a method for manufacturing a lithium ion secondary battery including an electrode cell, wherein the negative electrode includes a negative electrode current collector and a negative electrode active material layer formed on the surface of the negative electrode current collector.
- the electrode cell is formed by sequentially laminating a lithium-doped negative electrode, a separator, and a positive electrode provided with a positive electrode active material layer, and the negative electrode active material layer is formed with the positive electrode active material layer.
- the center is only 5% of the length from the non-opposing surplus region A and the end of the positive electrode active material layer to the center to the end of the positive electrode active material layer.
- the surplus region has an end region B facing the region extending in the direction of the above, and a central region C other than the surplus region A and the end region B, and the surplus region after the positive electrode and the negative electrode are short-circuited.
- Another aspect of the present disclosure is a method for manufacturing a lithium ion secondary battery including an electrode cell, wherein the negative electrode includes a negative electrode current collector and a negative electrode active material layer formed on the surface of the negative electrode current collector.
- the electrode cell is formed by sequentially laminating a lithium-doped negative electrode, a separator, and a positive electrode provided with a positive electrode active material layer, and the negative electrode active material layer is formed with the positive electrode active material layer.
- the center is only 5% of the length from the non-opposing surplus region A and the end of the positive electrode active material layer to the center to the end of the positive electrode active material layer.
- the lithium ion secondary battery is disassembled in a charged state and has an end region B facing the region extending in the direction of the above and a central region C other than the surplus region A and the end region B.
- this is a method for manufacturing a lithium ion secondary battery that satisfies the following equation (4).
- Equation (4) 0 ⁇ QA ⁇ QC According to the method for manufacturing a lithium ion secondary battery, which is another aspect of the present disclosure, it is possible to suppress the precipitation of lithium from the negative electrode, and it is possible to manufacture a lithium ion secondary battery having excellent characteristics.
- Another aspect of the present disclosure is a method for manufacturing a lithium ion secondary battery including an electrode cell, wherein the negative electrode includes a negative electrode current collector and a negative electrode active material layer formed on the surface of the negative electrode current collector.
- the electrode cell is formed by sequentially laminating a lithium-doped negative electrode, a separator, and a positive electrode provided with a positive electrode active material layer, and the negative electrode active material layer is formed with the positive electrode active material layer.
- the center is only 5% of the length from the non-opposing surplus region A and the end of the positive electrode active material layer to the center to the end of the positive electrode active material layer.
- the lithium ion secondary battery is disassembled in a charged state and has an end region B facing the region extending in the direction of the above and a central region C other than the surplus region A and the end region B.
- the discharge capacity QA of the region A, the discharge capacity QB of the end region B, and the discharge capacity QC of the central region C are measured, the lithium ion secondary satisfying the following equations (7) and (9) is satisfied.
- This is a method for manufacturing batteries.
- FIG. 2A is a plan view showing the configuration of an electrode precursor and a negative electrode for a power storage device
- FIG. 2B is a cross-sectional view taken along the line IIB-IIB in FIG. 2A. It is explanatory drawing which shows the surplus area A, the end area B, the center area C, and the effective width EW. It is explanatory drawing which shows the structure of the counter electrode unit, the porous insulating member, and the resin plate.
- Electrode manufacturing equipment 3, 5 ... Electrode solution tank, 7 ... Cleaning tank, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39 , 41, 43, 45 ... Conveying roller, 47 ... Supply roll, 49 ... Winding roll, 51 ... Counter electrode unit, 53 ... Porous insulating member, 55 ... Support base, 57 ... Circulation filtration unit, 61 ... DC power supply, 63 ... Blower, 67, 68 ... Support rod, 69 ... Partition plate, 70 ... Support rod, 71 ... Space, 73 ... Electrode precursor, 75 ... Negative electrode for power storage device, 79 ... Alkali metal-containing plate, 81 ... Filter, 83 ... Pump, 85 ... Piping, 93 ... Negative electrode current collector, 95 ... Negative electrode active material layer, 99 ... Positive electrode active material layer, 108 ... Mask, 109 ... Exposed part
- the power storage device of the present disclosure includes an electrode unit and an electrolytic solution.
- the electrode unit includes a positive electrode, a separator, and a negative electrode.
- the negative electrode includes a negative electrode current collector and a negative electrode active material layer.
- the negative electrode active material layer is formed on the surface of the negative electrode current collector.
- the negative electrode is doped with lithium.
- the “positive electrode” means a pole on the side where a current flows out during discharging and a current flows in during charging.
- the term “negative electrode” means a pole on the side where a current flows in during discharge and a current flows out during charging.
- the negative electrode potential after short-circuiting the positive electrode and the negative electrode means the negative electrode potential obtained by the following method. Specifically, the power storage device is discharged to 0 V by a charge / discharge tester for 12 hours or more, and then the positive electrode terminal and the negative electrode terminal are electrically short-circuited and left for 12 hours or more, and then short-circuited. It is a value measured within 0.5 to 1.5 hours after the release and the short circuit are released.
- lithium-doped means a state in which lithium is occluded, intercalated, adsorbed, supported, alloyed, or inserted in various states such as metals, ions, and compounds. ..
- examples of the “dope” include a phenomenon in which at least one of lithium and an anion is contained in the positive electrode active material, and a phenomenon in which lithium ions are contained in the negative electrode active material.
- “Dedoping” means desorption and release. Examples of the “dedoping” include a phenomenon in which lithium ions or anions are desorbed from the positive electrode active material, a phenomenon in which lithium ions are desorbed from the negative electrode active material, and the like.
- At least one of the negative electrode and the positive electrode is pre-doped with lithium. In the power storage device of the present disclosure, it is more preferable that the negative electrode is pre-doped with lithium.
- the lithium electrode includes metallic lithium and the like.
- the power storage device of the present disclosure can be manufactured, for example, as follows.
- a positive electrode active material layer is formed on the surface of the positive electrode current collector to manufacture a positive electrode.
- a negative electrode active material layer is formed on the surface of the negative electrode current collector to manufacture a negative electrode.
- Dope the negative electrode with lithium ions For example, a doping unit can be used to dope the negative electrode with lithium ions.
- the doping unit includes, for example, a doping tank, a transport unit, a counter electrode unit, a connection unit, and a porous insulating member.
- the electrode manufacturing apparatus 1 described later corresponds to a doping unit.
- the electrolytic solution tanks 3 and 5 described later correspond to doping tanks.
- the doping tank contains a solution containing lithium ions.
- the transport unit transports the electrode precursor along a path that passes through the doping tank.
- the counter electrode unit is housed in a doping tank.
- the connection unit electrically connects the electrode precursor and the counter electrode unit.
- the porous insulating member is arranged between the electrode precursor and the counter electrode unit and is in non-contact with the electrode precursor.
- the laminate is, for example, a stack of three or more units consisting of a positive electrode, a first separator, a negative electrode, and a second separator.
- the form of the laminated body is, for example, a plate shape, a sheet shape, a wound form, or the like.
- the laminate corresponds to the electrode unit.
- the form of the outer container is, for example, a square shape, a cylindrical shape, a laminated shape, or the like.
- the outer container may be a film or a can.
- the outer container is filled with the electrolytic solution.
- the power storage device is completed by the above steps.
- the lithium doping ratio is preferably 5% or more and 95% or less, more preferably 10% or more and 70% or less, and further preferably 15% or more and 50% or less with respect to the discharge capacity C2 of the negative electrode. ..
- the lithium doping ratio is the ratio of the amount of lithium doped into the negative electrode active material layer to the discharge capacity C2 of the negative electrode.
- the amount of lithium doped into the negative electrode active material layer is a value obtained by dividing the capacity of the current used for doping lithium by the mass of the negative electrode active material.
- the unit of the amount of lithium doped into the negative electrode active material layer is mAh / g.
- the discharge capacity C2 of the negative electrode is 0 V vs. Li / Li + to 3V vs. It is a value obtained by dividing the discharge capacity of the negative electrode when the negative electrode is charged / discharged between Li / Li + by the mass of the negative electrode active material contained in the negative electrode active material layer.
- the lithium doping ratio is 5% or more and 95% or less of the discharge capacity C2 of the negative electrode, the cycle durability of the power storage device is further improved.
- the power storage device of the present disclosure can be provided with basically the same configuration as the power storage device described in, for example, Japanese Patent Application Laid-Open No. 2004-266901.
- the power storage devices of the present disclosure include lithium ion capacitors, lithium ion secondary batteries, and the like.
- the lithium ion secondary battery means a lithium ion-containing power storage device in which the positive electrode and the negative electrode are non-polarizing electrodes.
- the term "current collector” means both a positive electrode current collector and a negative electrode current collector.
- the positive electrode includes a positive electrode current collector that receives and distributes electricity.
- the negative electrode includes a negative electrode current collector that receives and distributes electricity.
- (1-4) Positive Electrode Current Collector examples of the material of the positive electrode current collector include aluminum and stainless steel. Aluminum is preferable as the material of the positive electrode current collector.
- the thickness of the positive electrode current collector is not particularly limited, but is preferably in the range of 1 ⁇ m to 50 ⁇ m, more preferably in the range of 5 ⁇ m to 40 ⁇ m, and particularly preferably in the range of 10 ⁇ m to 40 ⁇ m.
- the aperture ratio of the positive electrode current collector (hereinafter referred to as the positive electrode current collector opening ratio) is preferably 0% or more and 0.1% or less, and more preferably 0%.
- the aperture ratio of the positive electrode current collector can be obtained by the following formula (10).
- Positive electrode current collector aperture ratio (%) [1- (mass of positive electrode current collector / true specific gravity of positive electrode current collector) / (apparent volume of positive electrode current collector)] ⁇ 100
- the "true specific gravity of the positive electrode current collector” is the mass per unit volume of the positive electrode current collector assuming that the positive electrode current collector has no holes.
- the "apparent volume of the positive electrode current collector” is the volume of the positive electrode current collector assuming that the positive electrode current collector has no holes.
- the "apparent volume of the positive electrode current collector” is a volume calculated based on the measured values of the vertical, horizontal, and thickness dimensions of the positive electrode current collector.
- the positive electrode active material a substance capable of reversibly doping and dedoping lithium is used.
- the positive electrode active material include lithium cobalt oxide and activated carbon.
- the specific surface area of lithium cobalt oxide is preferably 0.1 m 2 / g to 30 m 2 / g.
- the 50% volume cumulative diameter (D50) of the activated carbon is preferably 3 ⁇ m to 30 ⁇ m from the viewpoint of the packing density of the activated carbon.
- the value of the 50% volume cumulative diameter (D50) is a value obtained by the microtrack method.
- a positive electrode active material so that the obtained positive electrode can be charged and discharged in a region of 3 V or more.
- "Charge and discharge can be performed in the region of 3V or higher” means that a tripolar cell using a positive electrode as a working electrode and metallic lithium as a counter electrode and a reference electrode is used in a region of 3V or higher at a sweep rate of 0.1 mV / min.
- the click voltammetry measurement was performed, the oxidation current and the reduction current were confirmed in the region of 3V or more, the area ratio of the reduction current to the area of the oxidation current was 0.5 or more, and it was calculated from the area of the reduction current. It means that the capacity is 50 mAh / g or more.
- the area of the oxidation current is the area of the region surrounded by the axis showing the current value 0A and the oxidation wave.
- the area of the reduction current is the area of the region surrounded by the axis showing the current value 0A and the reduction wave.
- the area ratio of the reduction current to the area of the oxidation current is usually 2.0 or less.
- the capacity calculated from the area of the reduction current is usually 1000 mAh / g or less.
- Examples of the positive electrode active material for obtaining a positive electrode that can be charged and discharged in the region of 3 V or higher include transition metal oxides and inorganic acid compounds.
- the three transition metal oxides include cobalt oxides such as lithium cobaltate, nickel oxides such as lithium nickelate, manganese oxides such as lithium manganate, vanadium oxides such as lithium vanadium acid, and nickel-cobalt-manganese.
- Examples thereof include lithium-containing transition metal oxides such as primary transition oxides and ternary transition oxides of nickel-cobalt-aluminum.
- examples of the inorganic acid-based compound include phosphoric acid-based compounds such as lithium iron phosphate and lithium iron pyrophosphate.
- the positive electrode active material layer is formed by adhering a positive electrode active material to a positive electrode current collector.
- Examples of the method for adhering the positive electrode active material include coating, printing, injection, spraying, vapor deposition, crimping and the like.
- the thickness of the positive electrode active material layer is preferably 10 ⁇ m to 200 ⁇ m, more preferably 25 ⁇ m to 100 ⁇ m, and particularly preferably 50 to 100 ⁇ m.
- the thickness of the positive electrode active material layer is obtained by multiplying the total thickness of the positive electrode active material layers formed on both sides of the positive electrode by 1/2. Means the average thickness.
- the thickness of the positive electrode active material layer means the thickness of the positive electrode active material layer formed on one side of the positive electrode. The thickness of the positive electrode active material layer is the thickness after the positive electrode active material layer is roll-pressed.
- the thickness of the positive electrode active material layer When the thickness of the positive electrode active material layer is within the above range, the diffusion resistance of ions moving in the positive electrode active material layer becomes small. As a result, the internal resistance of the power storage device decreases. Further, when the thickness of the positive electrode active material layer is within the above range, the positive electrode capacity can be increased, so that the cell capacity can be increased. As a result, the capacity of the power storage device increases.
- the electrode density of the roll-pressed positive electrode active material layer is preferably 0.1 g / cm 3 to 5 g / cm 3 , more preferably 1 g / cm 3 to 4.5 g / cm 3 , and 2 g / cm. It is particularly preferably 3 to 4 g / cm 3 .
- the electrode density of the positive electrode active material layer is within the range of the above lower limit or more and the above upper limit or less, the energy density of the power storage device is increased and the cycle characteristics of the power storage device are improved.
- the electrode density of the positive electrode active material layer can be measured by the following method.
- a positive electrode is obtained by disassembling the power storage device.
- the obtained positive electrode is washed with diethyl carbonate and vacuum dried at 100 ° C.
- the mass of the positive electrode active material layer and the external volume of the positive electrode active material are measured.
- the electrode density of the positive electrode active material layer is obtained by dividing the mass of the positive electrode active material layer by the outer volume of the positive electrode active material layer.
- the "external volume of the positive electrode active material layer” is a volume calculated based on the measured values of the vertical dimension, the horizontal dimension, and the thickness dimension of the positive electrode active material layer, respectively.
- the basis weight of the positive electrode active material layer is preferably 10 g / m 2 to 500 g / m 2 , and more preferably 20 g / m 2 to 250 g / m 2 .
- the basis weight of the positive electrode active material layer is one side obtained by multiplying the total basis weight of the positive electrode active material layers formed on both sides of the positive electrode by 1/2. It means the average basis weight per unit.
- the basis weight of the positive electrode active material layer means the basis weight of the positive electrode active material layer formed on one side of the positive electrode.
- the basis weight of the positive electrode active material layer is within the above range, the energy density of the power storage device is increased, and the cycle characteristics of the power storage device are improved.
- the basis weight of the positive electrode active material layer can be measured by the following method.
- a positive electrode is obtained by disassembling the power storage device. The obtained positive electrode is washed with diethyl carbonate and dried at 100 ° C.
- a measurement sample having a predetermined area is punched out from the positive electrode to measure the mass. Then, in the measurement sample, the positive electrode active material layer is peeled off from the positive electrode current collector, and the mass of the remaining positive electrode current collector is measured. The mass of the positive electrode active material layer is calculated by subtracting the mass of the remaining positive electrode current collector from the mass of the measurement sample.
- the basis weight of the positive electrode active material layer is calculated by dividing the mass of the positive electrode active material layer by the area of the measurement sample.
- Negative electrode current collector Stainless steel, copper, nickel or the like can be used as the negative electrode current collector.
- the thickness of the negative electrode current collector is not particularly limited.
- the thickness of the negative electrode current collector is usually 1 ⁇ m to 50 ⁇ m, and particularly preferably 5 ⁇ m to 20 ⁇ m.
- the aperture ratio of the negative electrode current collector (hereinafter referred to as the negative electrode current collector opening ratio) is 0% or more and 0.1% or less.
- the aperture ratio of the negative electrode current collector is preferably 0% or more and 0.05% or less, and more preferably 0%.
- the aperture ratio of the negative electrode current collector is 0%.
- the aperture ratio of the negative electrode current collector can be obtained by the following formula (11).
- Negative electrode current collector aperture ratio (%) [1- (mass of negative electrode current collector / true specific gravity of negative electrode current collector) / (apparent volume of negative electrode current collector)] ⁇ 100
- the "true specific gravity of the negative electrode current collector” is the mass per unit volume of the negative electrode current collector assuming that the negative electrode current collector has no holes.
- the "apparent volume of the negative electrode current collector” is the volume of the negative electrode current collector assuming that the negative electrode current collector has no holes.
- the "apparent volume of the negative electrode current collector” is a volume calculated based on the measured values of the vertical dimension, the horizontal dimension, and the thickness dimension of the negative electrode current collector.
- the upper limit of the negative electrode current collector opening ratio is preferably 0.05%, particularly preferably 0%.
- the aperture ratio of the negative electrode current collector is equal to or less than the above upper limit, the electrode strength of the negative electrode current collector band can be maintained even if the thickness of the negative electrode current collector is small. As a result, it is possible to suppress breakage of the negative electrode current collector during manufacturing of the electrode and the cell. Further, when the aperture ratio of the negative electrode current collector is not more than the above upper limit, the resistance of the negative electrode can be reduced.
- Negative electrode active material As the negative electrode active material, a substance capable of reversibly doping and dedoping lithium can be used.
- the negative electrode active material include silicon-based materials and carbon-based materials.
- the silicon-based material include Si, SiO, SiOC and the like.
- the carbon-based material include graphite-based particles, hard carbon-based particles, soft carbon-based particles, polyacene-based organic semiconductor (PAS), and the like.
- Examples of graphite-based particles include graphite-based composite particles and polyacene-based organic semiconductors (PAS).
- the graphite-based particles, the hard carbon-based particles, and the soft carbon-based particles include composite particles containing graphite, hard carbon (non-graphitized carbon), and soft carbon (easily graphitized carbon) as main materials, respectively.
- the composite particles include those including the core particles of the main material and the graphitized substance that coats the surface of the core particles.
- Examples of the graphitized substance include tar, a graphitized substance derived from pitch, and the like.
- the 50% volume cumulative diameter (D50) of the graphite-based particles, the hard carbon-based particles, and the soft carbon-based particles is preferably in the range of 1.0 ⁇ m to 35 ⁇ m, and more preferably in the range of 2 ⁇ m to 30 ⁇ m. ..
- the 50% volume cumulative diameter (D50) of the graphite-based particles, the hard carbon-based particles, and the soft carbon-based particles is 1.0 ⁇ m or more, the graphite-based particles can be easily produced. Further, when the 50% volume cumulative diameter (D50) of the graphite-based particles, the hard carbon-based particles, and the soft carbon-based particles is 1.0 ⁇ m or more, gas is unlikely to be generated during charging. As a result, the durability of the power storage device is improved.
- the 50% volume cumulative diameter (D50) of the graphite-based particles, the hard carbon-based particles, and the soft carbon-based particles is a value obtained by the microtrack method.
- the polyacene-based organic semiconductor is a heat-treated product of an aromatic condensed polymer.
- Polyacene-based organic semiconductors have a polyacene-based skeletal structure.
- the atomic number ratio of hydrogen atom and carbon atom is 0.05 to 0.50.
- the atomic number ratio of hydrogen atom and carbon atom is a value obtained by dividing the number of hydrogen atoms by the number of carbon atoms.
- a polyacene-based organic semiconductor when the atomic number ratio of hydrogen atom and carbon atom is 0.50 or less, the electron conductivity becomes high, so that the internal resistance of the cell becomes high.
- the atomic number ratio of hydrogen atom and carbon atom is 0.05 or more, the capacity per unit mass increases, so that the energy density of the cell increases.
- the aromatic condensed polymer is a condensate of an aromatic hydrocarbon compound and aldehydes.
- the aromatic hydrocarbon compound include phenol, cresol, xylenol and the like.
- aldehydes include formaldehyde, acetaldehyde, furfural and the like.
- the specific surface area of the negative electrode active material is preferably 0.1 m 2 / g to 200 m 2 / g, and more preferably 0.5 m 2 / g to 50 m 2 / g.
- the specific surface area of the negative electrode active material is 0.1 m 2 / g or more, the resistance of the obtained power storage device becomes low.
- the specific surface area of the negative electrode active material is 200 m 2 / g or less, the irreversible capacity of the obtained power storage device during charging becomes low, and gas is less likely to be generated during charging. As a result, the durability of the power storage device is improved.
- the negative electrode active material layer is formed by adhering the negative electrode active material to the surface of the negative electrode current collector.
- Examples of the method for adhering the negative electrode active material include coating, printing, injection, spraying, vapor deposition, crimping and the like.
- the negative electrode active material layer 95 has, for example, a surplus region A, an end region B, and a central region C.
- FIG. 3 is a schematic view showing the negative electrode active material layer 95 in a cross section parallel to the width direction W of the negative electrode.
- the width direction W is a direction orthogonal to the longitudinal direction of the negative electrode.
- the width direction W is a direction parallel to any side of the negative electrode.
- the surplus region A is a region that does not face the positive electrode active material layer 99 in the thickness direction of the negative electrode and the positive electrode.
- the end region B is a region facing the positive electrode end region 101 of the positive electrode active material layer 99 in the thickness direction of the negative electrode and the positive electrode.
- the positive electrode end region 101 is a region extending from the end 103 in the width direction W of the positive electrode active material layer 99 in the direction of the center 105 by the length L1.
- the center 105 is the center of the positive electrode active material layer 99 in the width direction W.
- the length L1 is 5% of the length L2 from the end 103 to the center 105.
- the central region C is a region of the negative electrode active material layer 95 other than the surplus region A and the end region B.
- the center of the negative electrode active material layer 95 in the width direction W faces the center 105, for example, in the thickness direction of the negative electrode and the positive electrode.
- the negative electrode active material layer 95 has a surplus region A and an end region B on both sides in the width direction W, respectively.
- the negative electrode active material layer preferably satisfies the following formulas (1) to (3).
- the negative electrode active material layer preferably satisfies the following formulas (1) to (3).
- VA 2.0V Equation (2)
- VC 1.0V Equation (3)
- VA is the negative electrode potential of the surplus region A after the positive electrode and the negative electrode are short-circuited.
- VC is the negative electrode potential of the central region C after the positive electrode and the negative electrode are short-circuited.
- the VA and VC measuring methods are the measuring methods described in Examples described later.
- the negative electrode active material layer preferably satisfies the following formula (4).
- Equation (4) 0 ⁇ QA ⁇ QC QA is the discharge capacity of the surplus region A measured by disassembling the power storage device in the charged state.
- QC is the discharge capacity of the central region C measured by disassembling the power storage device in the charged state.
- the measurement method of QA and QC is the measurement method described in Examples described later.
- QA / QC is preferably 0.001 or more and 0.8 or less, and more preferably 0.002 or more and 0.2 or less.
- QA / QC is 0.001 or more and 0.8 or less, over-discharge can be suppressed and lithium precipitation can be suppressed.
- QA / QC is 0.002 or more and 0.2 or less, over-discharge can be further suppressed and lithium precipitation can be further suppressed.
- QA / QB is preferably 0.001 or more and 0.8 or less, and more preferably 0.002 or more and 0.2 or less.
- QB is the discharge capacity of the residual region B measured by disassembling the power storage device in the charged state.
- the QB measuring method is the measuring method described in Examples described later.
- QB / QC is preferably 0.7 or more and 0.99 or less, and more preferably 0.8 or more and 0.98 or less.
- QB / QC is 0.7 or more and 0.99 or less, over-discharge can be suppressed and lithium precipitation can be suppressed.
- QB / QC is 0.8 or more and 0.98 or less, over-discharge can be further suppressed and lithium precipitation can be further suppressed.
- the negative electrode active material layer satisfies the following formulas (7) and (9).
- Equation (7) 0.7 ⁇ QB / QC ⁇ 0.99 Equation (9) QA / QC ⁇ 0.1
- the precipitation of lithium can be suppressed.
- the QB / QC is preferably 0.75 or more and 0.95 or less.
- the precipitation of lithium can be further suppressed.
- the QA / QC is preferably 0 or more and 0.04 or less.
- the precipitation of lithium can be further suppressed.
- the density of the negative electrode active material layer is preferably 1.50 g / cc to 2.00 g / cc, and 1.60 g / cc to 1.90 g / cc. It is more preferably cc.
- the negative electrode active material layer preferably contains a silicon-based material.
- the silicon-based material include Si, SiO, SiOC, and the like, and those containing SiOx are preferable.
- the value of x is 0 or more and 1.5 or less.
- the content of the silicon-based material in the negative electrode active material layer is preferably 5% by mass or more and 99% by mass or less, more preferably 10% by mass or more and 95% by mass or less, and 15% by mass or more and 50% by mass or less. Is more preferable. When the content of the silicon-based material in the negative electrode active material layer is within the above range, the negative electrode capacity is further increased.
- the amount of the negative electrode active material layer is preferably 10 g / m 2 or more and 150 g / m 2 or less, and 20 g / m 2 or more and 90 g / m 2 or less. More preferably, it is more preferably 30 g / m 2 or more and 80 g / m 2 or less.
- the basis weight of the negative electrode active material layer is one side obtained by multiplying the total basis weight of the negative electrode active material layers formed on both sides of the negative electrode by 1/2. It means the average basis weight per unit.
- the basis weight of the negative electrode active material layer means the basis weight of the negative electrode active material layer formed on one side of the negative electrode.
- the negative electrode capacity and the cycle characteristics of the power storage device are improved.
- the content of the silicon-based material in the negative electrode active material layer is 5% by mass or more and 99% by mass or less and the basis weight of the negative electrode active material layer is within the above range, the negative electrode capacity and the cycle characteristics of the power storage device are further improved. improves.
- the basis weight of the negative electrode active material layer can be measured by the same method as the basis weight of the positive electrode active material layer.
- the thickness of the negative electrode active material layer is preferably 7 ⁇ m or more and 150 ⁇ m or less, more preferably 10 ⁇ m or more and 60 ⁇ m or less, and further preferably 25 ⁇ m or more and 50 ⁇ m or less.
- the thickness of the negative electrode active material layer is the total thickness of the negative electrode active material layers formed on both sides of the negative electrode multiplied by 1/2, per one side. Means the average thickness.
- the thickness of the negative electrode active material layer means the thickness of the negative electrode active material layer formed on one side of the negative electrode. The thickness of the negative electrode active material layer is the thickness after the negative electrode active material layer is roll-pressed.
- the negative electrode active material layer preferably contains a carbon-based material.
- the cycle characteristics of the power storage device are further improved.
- the content of the carbon-based material in the negative electrode active material layer is preferably 80% by mass or more and 99% by mass or less. When the content of the carbon-based material in the negative electrode active material layer is within this range, the cycle characteristics of the power storage device are further improved.
- the grain size of the negative electrode active material layer is preferably 30 g / m 2 or more and 150 g / m 2 or less, preferably 60 g. It is more preferably / m 2 or more and 130 g / m 2 or less, and further preferably 90 g / m 2 or more and 120 g / m 2 or less.
- the basis weight of the negative electrode active material layer is within the above range, the negative electrode capacity and the cycle characteristics of the power storage device are improved.
- the thickness of the negative electrode active material layer is preferably 45 ⁇ m or more and 220 ⁇ m or less, and 60 ⁇ m or more and 180 ⁇ m or less. More preferably, it is 80 ⁇ m or more and 150 ⁇ m or less. When the thickness of the negative electrode active material layer is within the above range, the negative electrode capacity and the cycle characteristics of the power storage device are improved.
- the positive electrode having the positive electrode active material layer and the negative electrode having the negative electrode active material layer as described above can be manufactured by a known manufacturing method.
- the positive electrode can be manufactured as follows. A positive electrode active material, a binder, and a solvent are mixed to prepare a positive electrode slurry.
- the positive electrode slurry may further contain a conductive material and a thickener, if necessary.
- a positive electrode having a positive electrode active material layer can be manufactured by applying a positive electrode slurry to a positive electrode current collector. Further, a positive electrode having a positive electrode active material layer can be manufactured by a method in which a positive electrode slurry is formed into a sheet and a sheet-shaped molded product is attached to a positive electrode current collector.
- the negative electrode can be manufactured as follows. A negative electrode active material, a binder, and a solvent are mixed to prepare a negative electrode slurry.
- the negative electrode slurry may further contain a conductive material and a thickener, if necessary.
- a negative electrode having a negative electrode active material layer can be manufactured by applying a negative electrode slurry to a negative electrode current collector. Further, a negative electrode having a negative electrode active material layer can be manufactured by a method in which a negative electrode slurry is formed into a sheet and a sheet-shaped molded product is attached to a negative electrode current collector.
- Examples of the binder contained in the positive electrode slurry or the negative electrode slurry include a rubber binder, a fluorine-containing resin, and an acrylic resin.
- Examples of the rubber binder include SBR and the like.
- Examples of the fluorine-containing resin include a fluorine-containing resin obtained by seed-polymerizing polytetrafluoroethylene, polyvinylidene fluoride, etc. with an acrylic resin.
- Examples of the solvent contained in the positive electrode slurry or the negative electrode slurry include water, an organic solvent and the like.
- Examples of the conductive material contained in the positive electrode slurry or the negative electrode slurry include acetylene black, Ketjen black, graphite, metal powder and the like.
- Examples of the thickener contained in the positive electrode slurry or the negative electrode slurry include carboxymethyl cellulose (CMC).
- the amount of the binder and the conductive material added to the positive electrode slurry or the negative electrode slurry can be appropriately adjusted according to the electric conductivity of the active material to be used, the shape of the electrode to be produced, and the like.
- the amount of the binder and the conductive material added is usually preferably 2% by mass to 20% by mass, particularly preferably 2% by mass to 10% by mass, based on the active material.
- the active material means a positive electrode active material or a negative electrode active material.
- a separator having an air permeability in the range of 1 sec to 200 sec is preferable.
- the air permeability is a value measured by a method compliant with JIS P8117.
- a non-woven fabric composed of polyethylene, polypropylene, polyester, cellulose, polyolefin, cellulose / rayon, etc., a microporous membrane, or the like can be appropriately selected and used.
- a non-woven fabric made of polyethylene, polypropylene, or cellulose / rayon is particularly preferable.
- the thickness of the separator is, for example, 5 ⁇ m to 20 ⁇ m, preferably 5 ⁇ m to 15 ⁇ m. When the thickness of the separator is 5 ⁇ m or more, a short circuit is unlikely to occur. When the thickness of the separator is 20 ⁇ m or less, the resistance becomes low.
- Electrolyte in the power storage device of the present disclosure, for example, an aprotic organic solvent electrolyte solution of a lithium salt can be used as the electrolyte.
- the electrolytic solution contains, for example, an aprotic organic solvent.
- the aprotic organic solvent include cyclic carbonates and chain carbonates.
- the cyclic carbonate include ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate and the like.
- the chain carbonate include dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), diethyl carbonate (EC), methylpropyl carbonate and the like.
- the electrolytic solution may be a mixed solvent in which two or more of the above-mentioned substances are mixed.
- the aprotic organic solvent may contain an organic solvent other than the cyclic carbonate and the chain carbonate.
- the organic solvent other than the cyclic carbonate and the chain carbonate include cyclic ether, chain carboxylic acid ester, and chain ether.
- the cyclic ether include ⁇ -butyrolactone and the like.
- the chain carboxylic acid ester include ethyl propionate.
- the chain ether include dimethoxyethane and the like.
- the electrolyte contains an electrolyte.
- the electrolyte include lithium salts and the like.
- the lithium salt include LiClO 4 , LiAsF 6 , LiBF 4 , LiPF 6 , LiN (C 2 F 5 SO 2 ) 2 , LiN (CF 3 SO 2 ) 2, and the like.
- LiPF 6 is particularly preferable as the lithium salt. LiPF 6 has high ionic conductivity and low resistance.
- the concentration of the lithium salt in the electrolytic solution is preferably 0.1 mol / L or more, and more preferably 0.5 to 1.5 mol / L. When the concentration of the lithium salt in the electrolytic solution is within the above range, the internal resistance of the power storage device can be lowered.
- the negative electrode included in the power storage device (hereinafter, also referred to as the negative electrode for power storage device) can be manufactured by, for example, the electrode manufacturing device 1 shown in FIG.
- the configuration of the electrode manufacturing apparatus 1 will be described with reference to FIG.
- the electrode manufacturing apparatus 1 includes an electrolytic solution tanks 3 and 5, a cleaning tank 7, and transfer rollers 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37. , 39, 41, 43, 45 (hereinafter, these may be collectively referred to as a transport roller group), a supply roll 47, a take-up roll 49, a counter electrode unit 51, a porous insulating member 53, and a support. It includes a stand 55, a circulation filtration unit 57, two DC power supplies 61, and a blower 63.
- the electrolyte tank 3 is a square tank with an open upper part.
- the bottom surface of the electrolytic solution tank 3 has a substantially U-shaped cross section.
- a partition plate 69, four counter electrode units 51, four porous insulating members 53, and a transfer roller 17 are present.
- the partition plate 69 is supported by a support rod 67 penetrating the upper end thereof.
- the support rod 67 is fixed to a wall or the like (not shown).
- the portion of the partition plate 69 excluding the upper end is in the electrolytic solution tank 3.
- the partition plate 69 extends in the vertical direction and divides the inside of the electrolytic solution tank 3 into two spaces.
- a transport roller 17 is attached to the lower end of the partition plate 69.
- the partition plate 69 and the transport roller 17 are fixed by a support rod 68 penetrating them.
- the vicinity of the lower end of the partition plate 69 is cut out so as not to come into contact with the transport roller 17.
- Each of the four counter electrode units 51 is supported by a support rod 70 penetrating the upper end thereof and extends in the vertical direction.
- the support rod 70 is fixed to a wall or the like (not shown).
- the portion of the counter electrode unit 51 other than the upper end is in the electrolytic solution tank 3.
- two are arranged so as to sandwich the partition plate 69 from both sides.
- the remaining two counter electrode units 51 are arranged along the inner surface of the electrolytic solution tank 3.
- the counter electrode unit 51 is connected to the positive electrode of the DC power supply 61.
- the detailed configuration of the counter electrode unit 51 will be described later.
- a porous insulating member 53 is attached to the surface of each counter electrode unit 51 on the space 71 side. The detailed configuration of the porous insulating member 53 will be described later.
- the cleaning tank 7 basically has the same configuration as the electrolytic solution tank 3. However, the counter electrode unit 51 and the porous insulating member 53 do not exist inside the cleaning tank 7.
- the electrolytic solution tank 5 basically has the same configuration as the electrolytic solution tank 3. However, in the electrolytic solution tank 5, not the transfer roller 17 but the transfer roller 27 exists.
- the transport roller group transports the electrode precursor 73, which will be described later, along a fixed path.
- the route is a route from the supply roll 47, sequentially through the electrolytic solution tank 3, the electrolytic solution tank 5, and the cleaning tank 7 to the winding roll 49.
- the portion passing through the electrolytic solution tank 3 is first a porous insulating member 53 attached along the inner side surface of the electrolytic solution tank 3 and a porous insulating member on the partition plate 69 side facing the porous insulating member 53.
- the space 71 between the space 71 and the 53 is moved downward, then the moving direction is changed upward by the transport roller 17, and finally, with the porous insulating member 53 attached along the inner surface of the electrolytic solution tank 3.
- the route is to move upward in the space 71 between the porous insulating member 53 on the partition plate 69 side facing the partition plate 69.
- the portion passing through the electrolytic solution tank 5 is first, the porous insulating member 53 attached along the inner side surface of the electrolytic solution tank 5 and the porous portion on the partition plate 69 side facing the porous insulating member 53.
- the space 71 between the quality insulating member 53 is moved downward, then the moving direction is changed upward by the transport roller 27, and finally, the porous insulation attached along the inner surface of the electrolytic solution tank 5.
- the route is to move upward in the space 71 between the member 53 and the porous insulating member 53 on the partition plate 69 side facing the member 53.
- the portion passing through the cleaning tank 7 first moves downward between the inner side surface of the cleaning tank 7 and the partition plate 69, and then moves in the moving direction by the transport roller 37. It is changed upward, and finally, it is a route of moving upward between the inner surface of the cleaning tank 7 and the partition plate 69.
- the transport rollers 15, 21, 25, and 29 are made of a conductive material. Further, the transfer rollers 15, 21, 25, and 29 are connected to the negative pole of the DC power supply 61.
- the transfer roller 13 presses the electrode precursor 73 in the direction of the transfer roller 15.
- the transfer roller 19 presses the electrode precursor 73 in the direction of the transfer roller 21.
- the transfer roller 23 presses the electrode precursor 73 in the direction of the transfer roller 25.
- the transfer roller 31 presses the electrode precursor 73 in the direction of the transfer roller 29.
- the transport roller group corresponds to the transport unit.
- the transfer rollers 15, 21, 25, 29 correspond to conductive transfer rollers.
- the transport rollers 13, 19, 23, and 31 are made of an elastomer except for the bearing portion. That is, the transport rollers 13, 19, 23, 31 including their surfaces are made of an elastomer. Elastomer is an example of an elastic body. Therefore, the transport rollers 13, 19, 23, and 31 are elastically deformable.
- the elastomer may be natural rubber or synthetic rubber.
- examples of the elastomer include EPDM, EPR, SBR, NBR, isoprene rubber, butadiene rubber, acrylic rubber, chloroprene rubber, silicone rubber, urethane rubber, fluororubber and the like.
- the supply roll 47 has an electrode precursor 73 wound around its outer circumference. That is, the supply roll 47 holds the electrode precursor 73 in a wound state.
- the transport roller group pulls out the electrode precursor 73 held by the supply roll 47 and transports the electrode precursor 73.
- the take-up roll 49 winds up and stores the negative electrode 75 for the power storage device that has been conveyed by the transfer roller group.
- the negative electrode 75 for a power storage device is manufactured by doping the electrode precursor 73 with lithium in the electrolytic solution tanks 3 and 5.
- the counter electrode unit 51 is housed in the electrolytic solution tanks 3 and 5 as described above.
- the counter electrode unit 51 has a plate-like shape.
- the counter electrode unit 51 has a structure in which a conductive base material and an alkali metal-containing plate are laminated. Examples of the material of the conductive base material include copper, stainless steel, nickel and the like.
- the form of the alkali metal-containing plate is not particularly limited, and examples thereof include a lithium plate and a lithium alloy plate.
- FIG. 3 shows the alkali metal-containing plate 79.
- the vicinity of the end portion in the width direction W can be covered with, for example, a mask 108.
- the mask 108 may be a resin plate 97 described later, or may be another member.
- the alkali metal-containing plate 79 faces the negative electrode active material layer 95 as shown in FIG.
- the effective width EW By changing the effective width EW, the doping amount of the surplus region A, the end region B, and the central region C can be changed. As the effective width EW is reduced, the doping amount of the excess region A and the end region B becomes smaller than the doping amount of the central region C. The amount of decrease in the doping amount when the effective width EW becomes smaller is more remarkable in the doping amount in the surplus region A than in the doping amount in the end region B.
- the amount of change in the negative electrode potential when the effective width EW becomes smaller is more remarkable in the negative electrode potential VA than in the negative electrode potential VB.
- the thickness of the alkali metal-containing plate can be, for example, 0.03 to 3 mm.
- the porous insulating member 53 and the electrode precursor 73 transported by the transport roller group are not in contact with each other.
- the shortest distance from the surface of the porous insulating member 53 to the electrode precursor 73 is preferably in the range of 0.5 to 100 mm, and particularly preferably in the range of 1 to 10 mm.
- the shortest distance is the distance between the surface of the porous insulating member 53, which is closest to the electrode precursor 73, and the electrode precursor 73.
- porous insulating member 53 examples include a resin mesh and the like.
- resin examples include polyethylene, polypropylene, nylon, polyetheretherketone, polytetrafluoroethylene and the like.
- the mesh opening can be set as appropriate, for example, 0.1 ⁇ m to 10 mm, but preferably within the range of 0.1 to 5 mm.
- the thickness of the mesh can be appropriately set and can be, for example, 1 ⁇ m to 10 mm, but is preferably in the range of 30 ⁇ m to 1 mm.
- the mesh opening ratio can be appropriately set, for example, 5 to 95%, but is preferably in the range of 50 to 95%.
- the porous insulating member 53 may be entirely made of an insulating material, or may be partially provided with an insulating layer.
- the resin plate 97 can be used.
- the resin plate 97 covers a part of the surface of the alkali metal-containing plate 79.
- the resin plate 97 is screwed to the conductive base material 77.
- the alkali metal-containing plate 79 and the porous insulating member 53 are sandwiched between the resin plate 97 and the conductive base material 77.
- Alkali metal ions are less likely to elute into the dope solution from the portion of the alkali metal-containing plate 79 covered with the resin plate 97. Therefore, by providing the resin plate 97, the amount of alkali metal ions eluted can be suppressed.
- the resin plate 97 can be the mask 108 shown in FIG. In this case, as shown in FIG. 4, the resin plate 97 covers both ends of the alkali metal-containing plate 79 in the width direction W. By changing the width of the mask 108, the effective width EW can be changed regardless of the width of the alkali metal-containing plate 79.
- the material of the resin plate 97 is not particularly limited.
- a resin such as polyethylene, polypropylene, nylon, polyetheretherketone, or polytetrafluoroethylene can be used.
- the support base 55 supports the electrolytic solution tanks 3, 5 and the cleaning tank 7 from below.
- the height of the support base 55 can be changed.
- the electrolytic solution is applied to the partition plate 69, the counter electrode unit 51, and the porous insulating member 53.
- Tanks 3 and 5 can be moved relatively downward. Further, when the support base 55 is raised, the electrolytic solution tanks 3 and 5 can be moved relatively upward with respect to the partition plate 69, the counter electrode unit 51, and the porous insulating member 53.
- the circulation filtration unit 57 is provided in each of the electrolytic solution tanks 3 and 5, respectively.
- the circulation filtration unit 57 includes a filter 81, a pump 83, and a pipe 85.
- the pipe 85 is a circulation pipe that exits the electrolytic solution tank 3, passes through the pump 83 and the filter 81 in sequence, and returns to the electrolytic solution tank 3.
- the doping solution in the electrolytic solution tank 3 circulates in the pipe 85 and the filter 81 by the driving force of the pump 83, and returns to the electrolytic solution tank 3 again.
- foreign substances and the like in the dope solution are filtered by the filter 81. Examples of the foreign matter include foreign matter precipitated from the doping solution, foreign matter generated from the electrode precursor 73, and the like.
- the description of the doped solution is omitted for convenience.
- the pipe 85 is a circulation pipe that exits the electrolytic solution tank 5, passes through the pump 83 and the filter 81 in sequence, and returns to the electrolytic solution tank 5.
- the doping solution in the electrolytic solution tank 5 circulates in the pipe 85 and the filter 81 by the driving force of the pump 83, and returns to the electrolytic solution tank 5 again.
- the circulation filtration unit 57 provided in the electrolytic solution tank 5 also has the same function and effect as the circulation filtration unit 57 provided in the electrolytic solution tank 3.
- the material of the filter 81 can be, for example, a resin such as polypropylene or polytetrafluoroethylene.
- the pore size of the filter 81 can be appropriately set, and can be, for example, 30 to 50 ⁇ m.
- the negative terminal on one of the two DC power supplies 61 (hereinafter referred to as one DC power supply 61) is connected to the transfer rollers 15 and 21, respectively. Further, the positive terminal of one of the DC power supplies 61 is connected to a total of four counter electrode units 51, respectively.
- These four counter electrode units 51 are counter electrode units 51 in the electrolytic solution tank 3. Since the electrode precursor 73 is in contact with the conductive transfer rollers 15 and 21, and the electrode precursor 73 and the counter electrode unit 51 in the electrolytic solution tank 3 are in a doping solution which is an electrolytic solution, the electrode is an electrode. The precursor 73 and the counter electrode unit 51 in the electrolytic solution tank 3 are electrically connected.
- the negative terminal on the other of the two DC power supplies 61 (hereinafter referred to as the other DC power supply 61) is connected to the transfer rollers 25 and 29, respectively. Further, the positive terminal of the other DC power supply 61 is connected to a total of four counter electrode units 51, respectively. These four counter electrode units 51 are counter electrode units 51 in the electrolytic solution tank 5. Since the electrode precursor 73 is in contact with the conductive transfer rollers 25 and 29, and the electrode precursor 73 and the counter electrode unit 51 in the electrolytic solution tank 5 are in a doping solution which is an electrolytic solution, the electrode is an electrode. The precursor 73 and the counter electrode unit 51 in the electrolytic solution tank 5 are electrically connected.
- the blower 63 blows gas onto the negative electrode 75 for the power storage device that has come out of the cleaning tank 7 to vaporize the cleaning liquid and dry the negative electrode 75 for the power storage device.
- the gas used is preferably a gas that is inert to the lithium-doped active material. Examples of such a gas include helium gas, neon gas, argon gas, dehumidified air from which water has been removed, and the like.
- the configuration of the electrode precursor 73 will be described with reference to FIGS. 2A and 2B.
- the electrode precursor 73 is a long strip-shaped member.
- the electrode precursor 73 includes a negative electrode current collector 93 and a negative electrode active material layer 95.
- the negative electrode active material layer 95 is formed on both surfaces of the negative electrode current collector 93.
- the negative electrode active material layer 95 has not yet been doped with lithium.
- the negative electrode active material layer 95 can be formed by applying the negative electrode slurry to the negative electrode current collector 93. Further, the negative electrode active material layer 95 can be formed by molding the negative electrode slurry into a sheet shape and attaching the sheet-shaped molded product to the negative electrode current collector 93.
- the negative electrode active material layer 95 has, for example, a surplus region A, an end region B, and a central region C, as shown in FIG.
- the electrode precursor 73 is wound around a supply roll 47.
- the doping solution is housed in the electrolytic solution tanks 3 and 5.
- the dope solution contains lithium ions and a solvent.
- the solvent include organic solvents.
- the organic solvent an aprotic organic solvent is preferable.
- aprotonic organic solvents for example, ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, 1-fluoroethylene carbonate, ⁇ -butyrolactone, acetonitrile, dimethoxyethane, tetrahydrofuran, dioxolane, methylene chloride , Sulfolane, diethylene glycol dimethyl ether (diglime), diethylene glycol methyl ethyl ether, triethylene glycol dimethyl ether (triglime), triethylene glycol butyl methyl ether, tetraethylene glycol dimethyl ether (tetraglime), ionic liquid and the like.
- the ionic liquid examples include a quaternary imidazolium salt, a quaternary pyridinium salt, a quaternary pyroridinium salt, a quaternary piperidinium salt and the like.
- the organic solvent may be composed of a single component, or may be a mixed solvent of two or more kinds of components.
- the lithium ion contained in the doping solution is an ion constituting a lithium salt.
- the anion portion constituting the lithium salt for example, PF 6 -, PF 3 ( C 2 F 5) 3 -, PF 3 (CF 3) 3 -, phosphorus anion having a fluoro group and the like; BF 4 -, BF 2 (CF) 2 -, BF 3 (CF 3) -, B (CN) 4 - boron anion having a fluoro group or a cyano group such as; N (FSO 2) 2 - , N (CF 3 SO 2) 2 - , N (C 2 F 5 SO 2) 2 - sulfonyl imide anion having a fluoro group such as; CF 3 SO 3 - is an organic sulfonate anion having a fluoro group and the like.
- the concentration of the lithium salt in the above-mentioned doping solution is preferably 0.1 mol / L or more, and more preferably in the range of 0.5 to 1.5 mol / L.
- concentration of the lithium salt in the doping solution is within the above range, the doping of lithium proceeds efficiently.
- the dope solution further contains additives such as vinylene carbonate, vinylethylene carbonate, 1-fluoroethylene carbonate, 1- (trifluoromethyl) ethylene carbonate, succinic anhydride, maleic anhydride, propane sultone, and diethyl sulfone. be able to.
- additives such as vinylene carbonate, vinylethylene carbonate, 1-fluoroethylene carbonate, 1- (trifluoromethyl) ethylene carbonate, succinic anhydride, maleic anhydride, propane sultone, and diethyl sulfone.
- the cleaning liquid is stored in the cleaning tank 7.
- the cleaning liquid preferably contains, for example, an aprotic solvent.
- the aprotonic solvent include at least one selected from carbonate-based solvents, ester-based solvents, ether-based solvents, hydrocarbon-based solvents, ketone-based solvents, nitrile-based solvents, sulfur-containing solvents, and amide-based solvents.
- the cleaning liquid may be substantially composed of an aprotic solvent, or may contain other components in addition to the aprotic solvent.
- the boiling point of the aprotic solvent is preferably 30 ° C. or higher and 200 ° C. or lower, more preferably 40 ° C. or higher and 150 ° C. or lower, and further preferably 50 ° C. or higher and 120 ° C. or lower.
- the boiling point is 30 ° C. or higher, it is possible to prevent the cleaning liquid in the cleaning tank 7 from being excessively vaporized.
- the boiling point is 200 ° C. or lower, it becomes easy to remove the cleaning liquid from the negative electrode 75 for the power storage device after cleaning.
- composition of the doping solution contained in the electrolytic solution tank 3 and the composition of the doping solution contained in the electrolytic solution tank 5 are different. In this case, a higher quality negative electrode 75 for a power storage device can be efficiently manufactured.
- the concentration of the SEI film-forming component in the doping solution contained in the electrolytic solution tank 3 is the SEI in the doping solution contained in the electrolytic solution tank 5. It is mentioned that it is higher than the concentration of the film-forming component.
- the difference between the composition of the dope solution contained in the electrolytic solution tank 3 and the composition of the dope solution contained in the electrolytic solution tank 5 is that the active material is doped with lithium in the first doping step and the second doping step. Corresponds to different.
- the electrode precursor 73 is pulled out from the supply roll 47 by the transfer roller group, and is conveyed along the above-mentioned path.
- the electrode precursor 73 passes through the electrolytic solution tanks 3 and 5, lithium is doped in the active material contained in the negative electrode active material layer 95.
- the process of doping lithium as described above corresponds to the doping process. It is preferable that the current density in the first doping step performed in the electrolytic solution tank 3 is different from the current density in the second doping step performed in the electrolytic solution tank 5. In this case, a higher quality negative electrode 75 for a power storage device can be efficiently manufactured.
- the current density in the first doping step is higher or lower than the current density in the second doping step.
- the difference between the current density in the first doping step and the current density in the second doping step corresponds to the difference in the conditions for doping the active material between the first doping step and the second doping step.
- the counter electrode unit 51 housed in the electrolytic solution tanks 3 and 5 includes a conductive base material and a lithium-containing plate arranged on the conductive base material, lithium housed in the electrolytic solution tank 3 is provided.
- the mass of lithium contained in the containing plate and the mass of lithium contained in the lithium-containing plate contained in the electrolytic solution tank 5 may be different.
- the effective width EW in the electrolytic solution tank 3 and the effective width EW in the electrolytic solution tank 5 may be the same or different, but it is preferable that they are different.
- the effective width EW in the electrolytic solution tank 3 or the electrolytic solution tank 5 is used by using the mask 108 shown in FIG. There is a way to change.
- the width of the alkali metal-containing plate 79 itself provided in the electrolytic solution tank 3 or the electrolytic solution tank 5 is provided. There is a method of changing the width of the alkali metal-containing plate 79 itself.
- the mass of lithium contained in the lithium-containing plates housed in the electrolytic solution tanks 3 and 5 is different, for example, the mass of lithium contained in the lithium-containing plate housed in the electrolytic solution tank 3 is larger. However, it may be more or less than the mass of lithium contained in the lithium-containing plate housed in the electrolytic solution tank 5.
- the difference between the mass of lithium contained in the lithium-containing plate housed in the electrolytic solution tank 3 and the mass of lithium contained in the lithium-containing plate housed in the electrolytic solution tank 5 is the first doping step.
- the conditions for doping lithium into the negative electrode active material differ between the second doping step and the second doping step.
- the electrode precursor 73 becomes the negative electrode 75 for the power storage device.
- the negative electrode 75 for the power storage device is washed in the washing tank 7 while being carried by the transport roller group. Finally, the negative electrode 75 for the power storage device is wound around the winding roll 49.
- the negative electrode 75 for a power storage device has the same configuration as the electrode precursor 73, except that the negative electrode active material is doped with lithium.
- the electrode manufacturing apparatus 1 is suitable for manufacturing a negative electrode for a power storage device included in a lithium ion type capacitor or a battery, and is particularly suitable for manufacturing a negative electrode for a power storage device included in a lithium ion capacitor or a lithium ion secondary battery.
- the lithium doping ratio in the negative electrode active material layer is preferably 5% or more and 95% or less of the discharge capacity C2 of the negative electrode. In this case, both the negative electrode capacity and the cycle durability are improved.
- the discharge capacity C2 of the negative electrode is 0 V vs. Li / Li + to 3V vs. It is a value obtained by dividing the discharge capacity of the negative electrode when the negative electrode is charged / discharged between Li / Li + by the mass of the negative electrode active material contained in the negative electrode active material layer.
- the battery is not particularly limited as long as it is a battery that uses the insertion / desorption of alkali metal ions.
- the battery may be a primary battery or a secondary battery.
- Examples of the battery include a lithium ion secondary battery, a sodium ion secondary battery, an air battery and the like. Among them, a lithium ion secondary battery is preferable.
- the form of the electrolyte that constitutes the battery is usually a liquid electrolyte.
- the basic composition of the electrolytic solution is the same as that of the doping solution described above.
- the concentration of alkali metal ions and the concentration of alkali metal salts in the electrolyte are preferably 0.1 mol / L or more, and more preferably in the range of 0.5 to 1.5 mol / L.
- the electrolyte may have a gel or solid form for the purpose of preventing liquid leakage.
- the battery can be provided with a separator between the positive electrode and the negative electrode to suppress their physical contact.
- a separator include a non-woven fabric or a porous film made from cellulose rayon, polyethylene, polypropylene, polyamide, polyester, polyimide, or the like.
- a plate-shaped structural unit composed of a positive electrode and a negative electrode and a separator interposed between them is laminated to form a laminated body, and the laminated body is sealed in an exterior film.
- a type cell can be mentioned.
- the laminate corresponds to the electrode unit.
- Another form of battery structure includes a wound cell in which the wound body is enclosed in an outer film or an outer can. The wound body is formed by laminating a long strip-shaped negative electrode, a separator, a positive electrode, and a separator in this order.
- a battery can be manufactured, for example, by forming a basic structure including at least a negative electrode and a positive electrode, and injecting an electrolyte into the basic structure.
- Example (4-1) Manufacture of a negative electrode for a power storage device according to Example 1-1
- a long strip-shaped negative electrode current collector was prepared.
- the size of the negative electrode current collector was 150 mm in width, 100 m in length, and 8 ⁇ m in thickness.
- the surface roughness Ra of the negative electrode current collector was 0.1 ⁇ m.
- the negative electrode current collector was made of copper foil.
- negative electrode active material layers 95 were formed on both sides of the negative electrode current collector 93, respectively.
- the average thickness of the negative electrode active material layer 95 formed on both sides of the negative electrode current collector 93 per one side was 50 ⁇ m.
- the negative electrode active material layer 95 was formed along the longitudinal direction of the negative electrode current collector 93.
- the negative electrode active material layer 95 was formed at the center of the negative electrode current collector 93 in the width direction W over a width of 120 mm.
- the negative electrode active material layer unformed portions at both ends of the negative electrode current collector 93 in the width direction W were 15 mm each.
- the negative electrode active material layer unformed portion is a portion where the negative electrode active material layer 95 is not formed.
- the electrode precursor 73 was obtained by drying, pressing, and cutting.
- the width of the electrode precursor 73 was 135 mm.
- the width of the negative electrode active material layer 95 included in the electrode precursor 73 was 120 mm.
- the electrode precursor 73 had a negative electrode active material layer unformed portion on only one side in the width direction W.
- the width of the negative electrode active material layer unformed portion was 15 mm.
- the negative electrode active material layer 95 contained the negative electrode active material, carboxymethyl cellulose, acetylene black, a binder and a dispersant in a mass ratio of 88: 3: 5: 3: 1.
- the negative electrode active material was a mixture of a silicon-based active material and a graphite-based active material.
- the active material contained a silicon-based active material and a graphite-based active material in a mass ratio of 2: 8.
- the silicon-based active material contained SiOx. The value of x was 1.0.
- Acetylene black corresponds to conductive agents.
- the counter electrode unit was manufactured as follows. First, a long copper plate having a thickness of 2 mm was prepared. A lithium metal plate was attached on this copper plate. The size of the lithium metal plate was 120 mm in width, 800 mm in length, and 1 mm in thickness. The lithium metal plate was attached along the longitudinal direction of the copper plate. The copper plate to which the lithium metal plate was attached in this way was designated as the counter electrode unit 51. Eight of the same counter electrode units 51 were manufactured. The lithium metal plate corresponds to the alkali metal-containing plate 79.
- the electrode manufacturing apparatus 1 shown in FIG. 1 was prepared, and the electrode precursor 73 was installed.
- counter electrode units 51 were installed in the electrolytic solution tanks 3 and 5, respectively.
- the electrolytic solution was supplied into the electrolytic solution tanks 3 and 5.
- the electrolytic solution is a solution containing 1.4 M of LiPF 6 .
- the solvent of the electrolytic solution is a mixed solvent containing ethylene carbonate, 1-fluoroethylene carbonate, and ethyl methyl carbonate in a volume ratio of 1: 2: 7.
- the electrode precursor 73 and the counter electrode unit 51 installed in the electrode manufacturing apparatus 1 are connected to a DC power supply with a current / voltage monitor, and the electrode precursor 73 is conveyed at a speed of 0.1 m / min while carrying a current of 5 A. Was energized.
- the center of the negative electrode active material layer 95 included in the electrode precursor 73 in the width direction W and the center of the lithium metal plate included in the counter electrode unit 51 in the width direction W coincided with each other.
- the energization time was set to a time during which the lithium doping ratio in the negative electrode active material layer became 25% of the discharge capacity C2 of the negative electrode in consideration of the irreversible capacity.
- the irreversible capacity was estimated in advance by measuring the discharge capacity of the negative electrode after doping with lithium. By this step, lithium was doped in the negative electrode active material in the negative electrode active material layer 95, and the electrode precursor 73 became the negative electrode 75 for the power storage device.
- the negative electrode for the power storage device is the negative electrode for the lithium ion secondary battery.
- the negative electrode 75 for the power storage device was wound after passing through the cleaning tank 7.
- the washing tank 7 contained DMC (dimethyl carbonate) at 25 ° C. As described above, the negative electrode 75 for the power storage device was manufactured.
- Example 1-1 (4-2) Production of Positive Electrode for Power Storage Device of Example 1-1 A long strip-shaped positive electrode current collector was prepared.
- the size of the positive electrode current collector was 150 mm in width, 100 m in length, and 12 ⁇ m in thickness.
- the positive electrode current collector was made of aluminum foil.
- a positive electrode undercoat layer was formed on both sides of the positive electrode current collector.
- a positive electrode active material layer was further formed on the positive electrode undercoat layer to prepare a positive electrode.
- the positive electrode active material layer was roll-pressed and cut to obtain a positive electrode.
- the width of the positive electrode current collector included in the positive electrode was 125 mm.
- the width of the positive electrode active material layer included in the positive electrode was 110 mm.
- the average thickness of the positive electrode active material layer formed on both sides of the positive electrode per one side was 67 ⁇ m.
- the positive electrode active material layer unformed portion was on only one side in the width direction W of the positive electrode.
- the positive electrode active material layer unformed portion is a portion of the positive electrode in which the positive electrode active material layer is not formed.
- the width of the positive electrode active material layer unformed portion was 15 mm.
- the positive electrode active material layer contained lithium cobalt oxide, acetylene black, and polyvinylidene fluoride in a mass ratio of 100: 3: 3.
- a tripole cell using metallic lithium as the counter electrode and the reference electrode was prepared, and cyclic voltammetry measurement was performed.
- the measurement conditions were a sweep speed of 0.1 mV / sec and a voltage range of 3.0 to 4.3 V.
- the area ratio of the reduction current to the oxidation current was estimated from the measurement result of the 2nd cycle, it was 0.99, and the capacity calculated from the area of the reduction current was 135 mAh / g. From the above, it was confirmed that the positive electrode obtained above can be charged and discharged in the region of 3 V or higher.
- Example 1-1 Manufacture of the power storage device of Example 1-1
- the electrode unit of the wound cell was produced by laminating a positive electrode and a negative electrode via a separator to prepare a laminated body, and then winding the laminated body.
- the separator was made of a polyethylene non-woven fabric having a thickness of 35 ⁇ m.
- the electrode unit produced was a wound body.
- the positive electrode active material layer unformed portion of the positive electrode current collector and the negative electrode active material layer unformed portion of the negative electrode current collector were on opposite sides in the width direction W. Further, the center of the positive electrode active material layer in the width direction W and the center of the negative electrode active material layer in the width direction W coincided with each other. As a result, the width of the excess region A of the negative electrode active material layer was 5 mm on each side in the width direction W.
- the current collecting lead portion of the positive electrode was ultrasonically welded to the portion where the positive electrode active material layer was not formed. Further, the current collecting lead portion of the negative electrode was ultrasonically welded to the portion where the negative electrode active material layer was not formed.
- the current collecting lead portion of the positive electrode was connected to the positive electrode terminal mounted on the battery lid.
- the current collecting lead portion of the negative electrode was connected to the negative electrode terminal mounted on the battery lid.
- the battery lid was welded to the battery can by laser welding. Finally, a required amount of electrolytic solution was injected from the liquid injection port provided on the battery lid to vacuum impregnate, and the liquid injection port was laser welded.
- the electrolytic solution was a mixed solution containing 1.4 M of LiPF 6 and containing ethylene carbonate, 1-fluoroethyl carbonate, and ethyl methyl carbonate in a volume ratio of 1: 2: 7.
- the composition of the negative electrode active material in Example 1-1 The composition of the negative electrode active material in Example 1-1, the thickness of the negative electrode active material layer, the amount of the negative electrode active material layer, the width of the negative electrode active material layer, the effective width EW in the electrolytic solution tank 3, and the electrolytic solution.
- Table 1 shows the effective width EW in the tank 5, the lithium doping ratio in the negative electrode, the material of the positive electrode active material, and the width of the positive electrode active material layer.
- LCO in Table 1 means lithium cobalt oxide.
- LFP in Table 1 means lithium iron phosphate.
- Example 1-2 a lithium metal plate having a width of 120 mm was used in each of the electrolytic solution tanks 3 and 5. Then, the vicinity of both ends of the lithium metal plate in the width direction W was covered with a resin plate 97 by 2.5 mm in width. As a result, the effective width EW was 115 mm in the electrolytic solution tanks 3 and 5.
- Example 1-6 a lithium metal plate having a width of 115 mm was used for the electrolytic solution tank 3.
- the effective width EW in the electrolytic solution tank 3 was 115 mm.
- a lithium metal plate having a width of 99 mm was used for the electrolytic solution tank 5.
- the effective width EW in the electrolytic solution tank 5 was 99 mm.
- Example 1-7 a lithium metal plate having a width of 120 mm was used for the electrolytic solution tank 3.
- the effective width EW in the electrolytic solution tank 3 was 120 mm.
- a lithium metal plate having a width of 105 mm was used for the electrolytic solution tank 5.
- the effective width EW in the electrolytic solution tank 5 was 105 mm.
- Comparative Example 1-2 a lithium metal plate having a width of 120 mm was used in the electrolytic solution tank 3.
- the effective width EW in the electrolytic solution tank 3 was 120 mm.
- a lithium metal plate having a width of 120 mm was used in the electrolytic solution tank 5.
- the central portion excluding the range of 5 mm at both ends in the width direction W was covered with a resin plate having a width of 110 mm.
- the current value and the transport speed were adjusted so that the lithium doping ratio in the surplus region A was 100% of the discharge capacity and the lithium doping ratio in the central region C was 20%.
- Comparative Example 1-3 the electrode precursor 73 was not pre-doped.
- the power storage device was manufactured by using the electrode precursor 73 which was not pre-doped as the negative electrode 75 for the power storage device.
- Examples 2-1 to 2-3 and Comparative Example 2-1 a lithium metal plate having a width of 120 mm was used for the electrolytic solution tanks 3 and 5.
- Example 1-2 in each of the electrolytic solution tanks 3 and 5, the vicinity of both ends of the lithium metal plate in the width direction W was covered with a resin plate 97 by 14 mm each. As a result, in Example 1-2, the effective width EW was 92 mm in the electrolytic solution tanks 3 and 5.
- lithium cobalt oxide was used as the positive electrode active material. Cyclic voltammetry measurements were performed on these positive electrodes in the same manner as in Example 1-1. As a result, the area ratio of the reduction current to the oxidation current was 0.99 for all the positive electrodes, which was calculated from the area of the reduction current. The capacity was 135 mAh / g.
- lithium iron phosphate was used as the positive electrode active material. Cyclic voltammetry measurements were also performed on these positive electrodes using a three-pole cell in the same manner as in Example 1-1 except that the voltage range was set to 3.0 to 4.0 V. As a result, the area ratio of the reduction current to the oxidation current was 0.99 for all the positive electrodes, and the capacity calculated from the area of the reduction current was 160 mAh / g.
- Examples 1-1 to 1-3, Examples 2-1 to 2-3, Comparative Examples 1-1 to 1 -3 and the power storage device of Comparative Example 2-1 have an initial discharge capacity, a negative electrode potential after a short circuit, a negative electrode discharge capacity in a charged state, a defect rate after a 25 ° C. 5C cycle, and a capacity maintenance after a 60 ° C. 1C cycle. Each rate was evaluated.
- the evaluation method is as follows.
- the power storage device was charged with a constant current of 1 A until the cell voltage reached 4.3 V. Next, constant current-constant voltage charging applying a constant voltage of 4.3 V was performed for 30 minutes. Next, the battery was discharged with a constant current of 1 A until the cell voltage became 2.0 V. A cycle test was performed in which the above cycle was repeated, and the discharge capacity at the second discharge was measured. This measured value was taken as the initial discharge capacity. (Negative potential after short circuit) The power storage device after the evaluation of the initial discharge capacity described above was discharged with a constant current to 0 V over 12 hours or more with a charge / discharge tester.
- the positive electrode terminal and the negative electrode terminal were left to stand for 12 hours or more in a state of being electrically short-circuited.
- the short circuit was released.
- the power storage device was disassembled, and the surplus region A, the end region B, and the central region C were sampled, respectively.
- the negative electrode potential VA in the surplus region A, the negative electrode potential VB in the end region B, and the negative electrode potential VC in the central region C were measured, respectively.
- the power storage device after the evaluation of the initial discharge capacity described above was charged with a charge / discharge tester at a constant current of 1 A until the cell voltage became 4.3 V.
- the power storage device was charged with a constant current-constant voltage applying a constant voltage of 4.3 V for 30 minutes.
- the power storage device was disassembled, and the surplus region A, the end region B, and the central region C were sampled, respectively.
- the negative electrode discharge capacity QA in the surplus region A, the negative electrode discharge capacity QB in the end region B, and the negative electrode discharge capacity QC in the central region C were measured, respectively.
- QA / QB, QA / QC, and QB / QC were calculated. (Defective rate after 25 ° C and 5C cycle)
- Ten power storage devices after the evaluation of the initial discharge capacity described above were prepared, and the initial discharge capacity of each was measured.
- each of the 10 power storage devices was subjected to a cycle test in an atmosphere of 25 ° C.
- the cycle test was a test in which basically the same cycle as the initial discharge capacity measurement was repeated 100 times. However, in the cycle test, constant current charging and discharging were performed with a current value equivalent to 5C. 5C is a current capable of discharging the initial discharge capacity in 1/5 hour.
- each of the 10 power storage devices was disassembled.
- a power storage device in which lithium metal was deposited on the surface of the negative electrode was determined to be defective.
- the ratio of the number of defective power storage devices to 10 (hereinafter referred to as the defective rate after 25 ° C. and 5 C cycles) was calculated. (Capacity retention rate after 60 ° C. 1C cycle)
- the initial discharge capacity of the power storage device was measured.
- the power storage device was subjected to a cycle test in an atmosphere of 60 ° C.
- the cycle test was a test in which basically the same cycle as the initial discharge capacity measurement was repeated 100 times. However, in the cycle test, constant current charging and discharging were performed with a current value equivalent to 1C.
- 1C is a current capable of discharging the initial discharge capacity in 1 hour.
- the power storage device was cooled to room temperature.
- the discharge capacity after 100 cycles was measured by the same method as the method for measuring the initial discharge capacity.
- the ratio of the discharge capacity after 100 cycles to the initial discharge capacity (hereinafter referred to as the capacity retention rate after 1 C cycle at 60 ° C.) was calculated.
- Table 3 shows the evaluation results of Examples 1-1 to 1-7 and Comparative Examples 1-1 to 1-3.
- Table 4 shows the evaluation results of Examples 2-1 to 2-3 and Comparative Example 2-1.
- each of the above embodiments may be shared by a plurality of components, or the function of the plurality of components may be exerted by one component. Further, a part of the configuration of each of the above embodiments may be omitted. In addition, at least a part of the configuration of each of the above embodiments may be added or replaced with respect to the configuration of the other embodiment.
- the present disclosure can be realized in various forms such as a system having the power storage device as a component.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Inorganic Chemistry (AREA)
- Composite Materials (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
Description
式(2) VC≦1.0V
式(3) VA/VC≧0.7
本開示の一局面である蓄電デバイスは、負極からリチウムが析出することを抑制でき、優れた特性を有する。
本開示の別の局面である蓄電デバイスは、負極からリチウムが析出することを抑制でき、優れた特性を有する。
式(9) QA/QC≦0.1
本開示の別の局面である蓄電デバイスは、負極からリチウムが析出することを抑制でき、優れた特性を有する。
式(2) VC≦1.0V
式(3) VA/VC≧0.7
本開示の別の局面であるリチウムイオン二次電池の製造方法によれば、負極からリチウムが析出することを抑制でき、優れた特性を有するリチウムイオン二次電池を製造できる。
本開示の別の局面であるリチウムイオン二次電池の製造方法によれば、負極からリチウムが析出することを抑制でき、優れた特性を有するリチウムイオン二次電池を製造できる。
式(9) QA/QC≦0.1
本開示の別の局面であるリチウムイオン二次電池の製造方法によれば、負極からリチウムが析出することを抑制でき、優れた特性を有するリチウムイオン二次電池を製造できる。
(1-1)蓄電デバイスの全体構成
本開示の蓄電デバイスは、電極ユニットと、電解液とを備える。電極ユニットは、正極、セパレータ、及び負極を備える。負極は、負極集電体と、負極活物質層とを備える。負極活物質層は、負極集電体の表面に形成されている。負極には、リチウムがドープされている。
本開示の蓄電デバイスの具体例として、リチウムイオンキャパシタ、リチウムイオン二次電池等が挙げられる。本明細書において、リチウムイオン二次電池とは、正極及び負極が非分極性電極である、リチウムイオンを含有する蓄電デバイスを意味する。
本明細書において「集電体」とは、正極集電体と負極集電体との両方を意味する。正極は、電気を受配電する正極集電体を備える。負極は、電気を受配電する負極集電体を備える。
正極集電体の材質として、例えば、アルミニウム、ステンレス鋼等が挙げられる。正極集電体の材質として、アルミニウムが好ましい。正極集電体の厚みは特に限定されないが、1μm~50μmの範囲が好ましく、5μm~40μmの範囲がより好ましく、10μm~40μmの範囲が特に好ましい。
前記式(10)において、「正極集電体の真比重」とは、正極集電体に孔が開いていないと仮定した場合の正極集電体の単位体積当たりの質量である。「正極集電体の見かけ体積」とは、正極集電体に孔が開いていないと仮定した場合の正極集電体の体積である。「正極集電体の見かけ体積」は、正極集電体の縦寸法、横寸法及び厚み寸法をそれぞれ測定し、それらの測定値に基づいて算出される体積である。正極集電体開口率が0%以上0.1%以下であることにより、正極集電体への正極活物質層の塗工が容易になる。
正極活物質として、リチウムを可逆的にドープ・脱ドープ可能な物質が用いられる。正極活物質として、例えば、コバルト酸リチウム、活性炭等が挙げられる。コバルト酸リチウムの比表面積は、0.1m2/g~30m2/gであることが好ましい。また、活性炭の50%体積累積径(D50)は、活性炭の充填密度の観点から、3μm~30μmであることが好ましい。活性炭の比表面積及び50%体積累積径(D50)が上記の範囲内にある場合、蓄電デバイスのエネルギー密度がさらに向上する。ここで、50%体積累積径(D50)の値は、マイクロトラック法により求められる値である。
正極活物質層は、正極集電体に、正極活物質を付着させることにより形成される。正極活物質を付着させる方法として、例えば、塗布、印刷、射出、噴霧、蒸着又は圧着等が挙げられる。
負極集電体として、ステンレス鋼、銅、ニッケル等を用いることができる。負極集電体の厚みは特に限定されない。負極集電体の厚みは、通常、1μm~50μmであり、5μm~20μmであることが特に好ましい。
前記式(11)において、「負極集電体の真比重」とは、負極集電体に孔が開いていないと仮定した場合の負極集電体の単位体積当たりの質量である。「負極集電体の見かけ体積」とは、負極集電体に孔が開いていないと仮定した場合の負極集電体の体積である。「負極集電体の見かけ体積」は、負極集電体の縦寸法、横寸法及び厚み寸法をそれぞれ測定し、それらの測定値に基づいて算出される体積である。
負極活物質として、リチウムを可逆的にドープ・脱ドープ可能である物質を使用できる。負極活物質として、例えば、シリコン系材料、炭素系材料等が挙げられる。シリコン系材料として、例えば、Si、SiO、SiOC等が挙げられる。炭素系材料として、例えば、黒鉛系粒子、ハードカーボン系粒子、ソフトカーボン系粒子、ポリアセン系有機半導体(PAS)等が挙げられる。黒鉛系粒子として、例えば、黒鉛系複合粒子、ポリアセン系有機半導体(PAS)等が挙げられる。
負極活物質層は、負極集電体の表面に負極活物質を付着させることにより形成される。負極活物質を付着させる方法として、例えば、塗布、印刷、射出、噴霧、蒸着又は圧着等が挙げられる。
式(2) VC≦1.0V
式(3) VA/VC≧0.7
VAは、正極と負極とを短絡させた後の余剰領域Aの負極電位である。VCは、正極と負極とを短絡させた後の中心領域Cの負極電位である。VA及びVCの測定方法は、後述する実施例に記載された測定方法である。
QAは、充電状態で蓄電デバイスを解体し、測定した余剰領域Aの放電容量である。QCは、充電状態で蓄電デバイスを解体し、測定した中心領域Cの放電容量である。QA及びQCの測定方法は、後述する実施例に記載された測定方法である。
式(9) QA/QC≦0.1
式(7)及び式(9)を充足する場合、リチウムの析出を抑制することができる。
上記のような正極活物質層を有する正極、及び負極活物質層を有する負極は、既知の製造方法により製造することができる。
本開示の蓄電デバイスにおけるセパレータの材料として、透気度が1sec~200secの範囲内にあるセパレータが好ましい。透気度は、JISP8117に準拠した方法により測定される値である。
本開示の蓄電デバイスにおいて、電解液として、例えば、リチウム塩の非プロトン性有機溶媒電解質溶液を用いることができる。
(2-1)電極製造装置1の構成
蓄電デバイスが備える負極(以下では、蓄電デバイス用負極ともいう)は、例えば、図1に示す電極製造装置1により製造できる。
電極前駆体73の構成を、図2A及び図2Bに基づき説明する。電極前駆体73は、長尺の帯状の部材である。図2Bに示すように、電極前駆体73は、負極集電体93と、負極活物質層95と、を備える。負極活物質層95は、負極集電体93の両面に形成されている。電極前駆体73において、負極活物質層95はリチウムを未だドープされていない。
電極前駆体73を供給ロール47に巻き回す。電解液槽3、5にドープ溶液を収容する。ドープ溶液は、リチウムイオンと、溶媒とを含む。溶媒として、例えば、有機溶媒が挙げられる。有機溶媒として、非プロトン性の有機溶媒が好ましい。
本開示の電池の製造方法は、正極、負極及び電解質を備える電池の製造方法であって、上記「2.蓄電デバイス用負極の製造方法」により蓄電デバイス用負極を製造する工程を含む。
(4-1)実施例1-1の蓄電デバイス用負極の製造
長尺の帯状の負極集電体を用意した。負極集電体のサイズは、幅150mm、長さ100m、厚さ8μmであった。負極集電体の表面粗さRaは0.1μmであった。負極集電体は銅箔から成っていた。
長尺の帯状の正極集電体を用意した。正極集電体のサイズは、幅150mm、長さ100m、厚さ12μmであった。正極集電体はアルミニウム箔から成っていた。
評価用の蓄電デバイスとして、捲回型セルを作成した。捲回型セルの電極ユニットは、セパレータを介して正極と負極とを積層して積層体を作成し、その積層体を捲回することによって作成した。セパレータは、厚さ35μmのポリエチレン製不織布から成っていた。作成された電極ユニットは捲回体であった。
実施例1-2~1-7、実施例2-1~2-3、及び比較例1-1~1-3の蓄電デバイスを、基本的には実施例1-1の蓄電デバイスと同様に製造した。ただし、負極活物質の組成と、負極活物質層の厚みと、負極活物質層の目付量と、負極活物質層の幅と、電解液槽3における有効幅EWと、電解液槽5における有効幅EWと、負極におけるリチウムドープ割合と、正極活物質の材料と、正極活物質層の幅とを、表1又は表2に示すとおりとした。
実施例1-1~1-3、実施例2-1~2-3、比較例1-1~1-3、及び比較例2-1の蓄電デバイスについて、初期放電容量、短絡後の負極電位、充電状態での負極放電容量、25℃5Cサイクル後の不良率、及び60℃1Cサイクル後の容量維持率をそれぞれ評価した。評価方法は以下のとおりである。
蓄電デバイスを、1Aの定電流でセル電圧が4.3Vになるまで充電した。次に、4.3Vの定電圧を印可する定電流―定電圧充電を30分間行った。次に、1Aの定電流でセル電圧が2.0Vになるまで放電した。以上のサイクルを繰り返すサイクル試験を行い、2回目の放電における放電容量を測定した。この測定値を初期放電容量とした。
(短絡後の負極電位)
上述した初期放電容量の評価後の蓄電デバイスを充放電試験機にて12時間以上かけて0Vまで定電流放電させた。次に、正極端子と負極端子とを電気的に短絡させた状態で12時間以上放置した。次に、短絡を解除した。次に、蓄電デバイスを解体し、余剰領域A、端部領域B、中心領域Cをそれぞれサンプリングした。短絡解除後0.5~1.5時間内に余剰領域Aの負極電位VAと、端部領域Bの負極電位VBと、中心領域Cの負極電位VCとをそれぞれ測定した。
(充電状態での負極放電容量)
上述した初期放電容量の評価後の蓄電デバイスを充放電試験機にて1Aの定電流でセル電圧が4.3Vになるまで充電した。次に、蓄電デバイスに対し、4.3Vの定電圧を印可する定電流―定電圧充電を30分間行った。次に、蓄電デバイスを解体し、余剰領域A、端部領域B、中心領域Cをそれぞれサンプリングした。そして、余剰領域Aの負極放電容量QAと、端部領域Bの負極放電容量QBと、中心領域Cの負極放電容量QCとをそれぞれ測定した。さらに、QA/QB、QA/QC、QB/QCを算出した。
(25℃5Cサイクル後の不良率)
上述した初期放電容量の評価後の蓄電デバイスを10個準備し、それぞれの初期放電容量を測定した。次に、10個の蓄電デバイスのそれぞれについて、25℃の雰囲気下でサイクル試験を実施した。サイクル試験は、初期放電容量測定と基本的には同じサイクルを100回繰り返す試験であった。ただし、サイクル試験では、定電流の充電及び放電を、5C相当の電流値で行った。5Cは、初期放電容量を1/5時間で放電できる電流である。
(60℃1Cサイクル後の容量維持率)
蓄電デバイスの初期放電容量を測定した。次に、蓄電デバイスに対し、60℃の雰囲気下でサイクル試験を実施した。サイクル試験は、初期放電容量測定と基本的には同じサイクルを100回繰り返す試験であった。ただし、サイクル試験では、定電流の充電及び放電を、1C相当の電流値で行った。1Cは、初期放電容量を1時間で放電できる電流である。
基本的には実施例1-1等の評価方法と同様の方法で、実施例1-4~1-7の蓄電デバイスを評価した。ただし、実施例1-4~1-7の蓄電デバイスの評価においては、期放電容量、充電状態での放電容量、25℃5Cサイクル後の不良率、及び60℃1Cサイクル後の容量維持率の評価において、蓄電デバイスを充電する際の上限電圧を4.0Vとした。
以上、本開示の実施形態について説明したが、本開示は上述の実施形態に限定されることなく、種々変形して実施することができる。
Claims (19)
- 正極、セパレータ、及び、負極を備える電極ユニットと、電解液と、を備え、
前記負極にリチウムがドープされた蓄電デバイスであって、
前記負極は、負極集電体と、前記負極集電体の表面に形成された負極活物質層とを備え、
前記正極は、正極集電体と、前記正極集電体の表面に形成された正極活物質層とを備え、
前記負極活物質層は、
前記正極活物質層と対向しない余剰領域Aと、
前記正極活物質層のうち、前記正極活物質層の端部から、前記正極活物質層の中心から前記端部までの長さの5%の長さだけ、前記中心の方向に延びる領域と対向する端部領域Bと、
前記余剰領域A及び前記端部領域B以外の中心領域Cと、
を有し、
前記正極と前記負極とを短絡させた後の前記余剰領域Aの負極電位VAと、前記正極と前記負極とを短絡させた後の前記中心領域Cの負極電位VCとが、以下の式(1)~(3)を充足する蓄電デバイス。
式(1) VA≦2.0V
式(2) VC≦1.0V
式(3) VA/VC≧0.7 - 正極、セパレータ、及び、負極を備える電極ユニットと、電解液と、を備え、
前記負極にリチウムがドープされた蓄電デバイスであって、
前記負極は、負極集電体と、前記負極集電体の表面に形成された負極活物質層とを備え、
前記正極は、正極集電体と、前記正極集電体の表面に形成された正極活物質層とを備え、
前記負極活物質層は、
前記正極活物質層と対向しない余剰領域Aと、
前記正極活物質層のうち、前記正極活物質層の端部から、前記正極活物質層の中心から前記端部までの長さの5%の長さだけ、前記中心の方向に延びる領域と対向する端部領域Bと、
前記余剰領域A及び前記端部領域B以外の中心領域Cと、
を有し、
充電状態で前記蓄電デバイスを解体し、前記余剰領域Aの放電容量QAと、前記中心領域Cの放電容量QCとを測定した場合、以下の式(4)を充足する蓄電デバイス。
式(4) 0<QA<QC - 請求項2に記載の蓄電デバイスであって、
以下の式(5)をさらに充足する蓄電デバイス。
式(5) 0.001≦QA/QC≦0.8 - 請求項3に記載の蓄電デバイスであって、
充電状態で前記蓄電デバイスを解体し、前記放電容量QA及び前記放電容量QCに加えて、前記端部領域Bの放電容量QBをさらに測定した場合、以下の式(6)をさらに充足する蓄電デバイス。
式(6) 0.001≦QA/QB≦0.8 - 請求項4に記載の蓄電デバイスであって、
以下の式(7)をさらに充足する蓄電デバイス。
式(7) 0.7≦QB/QC≦0.99 - 正極、セパレータ、及び、負極を備える電極ユニットと、電解液と、を備え、
前記負極にリチウムがドープされた蓄電デバイスであって、
前記負極は、負極集電体と、前記負極集電体の表面に形成された負極活物質層とを備え、
前記正極は、正極集電体と、前記正極集電体の表面に形成された正極活物質層とを備え、
前記負極活物質層は、
前記正極活物質層と対向しない余剰領域Aと、
前記正極活物質層のうち、前記正極活物質層の端部から、前記正極活物質層の中心から前記端部までの長さの5%の長さだけ、前記中心の方向に延びる領域と対向する端部領域Bと、
前記余剰領域A及び前記端部領域B以外の中心領域Cと、
を有し、
充電状態で前記蓄電デバイスを解体し、前記余剰領域Aの放電容量QAと、前記端部領域Bの放電容量QBと、前記中心領域Cの放電容量QCとを測定した場合、以下の式(7)及び式(9)を充足する蓄電デバイス。
式(7) 0.7≦QB/QC≦0.99
式(9) QA/QC≦0.1 - 請求項1~6のいずれか1項に記載の蓄電デバイスであって、
前記負極活物質層が炭素系材料を含み、
前記負極活物質層における前記炭素系材料の含有率が80質量%以上99質量%以下である蓄電デバイス。 - 請求項7に記載の蓄電デバイスであって、
前記炭素系材料は黒鉛系粒子である蓄電デバイス。 - 請求項7に記載の蓄電デバイスであって、
前記炭素系材料はハードカーボン系粒子又はソフトカーボン系粒子である蓄電デバイス。 - 請求項7~9のいずれか1項に記載の蓄電デバイスであって、
前記負極活物質層の片面における目付量が30g/m2以上150g/m2以下である蓄電デバイス。 - 請求項7~9のいずれか1項に記載の蓄電デバイスであって、
前記負極活物質層の片面における厚みが45μm以上220μm以下である蓄電デバイス。 - 請求項1~6のいずれか1項に記載の蓄電デバイスであって、
前記負極活物質層がシリコン系材料を含み、
前記負極活物質層における前記シリコン系材料の含有率が10質量%以上95質量%以下である蓄電デバイス。 - 請求項12に記載の蓄電デバイスであって、
前記シリコン系材料はSiOx(0≦x≦1.5)を含有するものである蓄電デバイス。 - 請求項12又は13に記載の蓄電デバイスであって、
前記負極活物質層の片面における目付量が10g/m2以上150g/m2以下である蓄電デバイス。 - 請求項12~14のいずれか1項に記載の蓄電デバイスであって、
前記負極活物質層の厚みが7μm以上150μm以下である蓄電デバイス。 - 請求項1~15のいずれか1項に記載の蓄電デバイスであって、
前記負極へのリチウムドープは、前記負極の作成後、且つ前記電極ユニットの組立前に実施されたものである蓄電デバイス。 - 電極セルを備えるリチウムイオン二次電池の製造方法であって、
負極集電体と、前記負極集電体の表面に形成された負極活物質層とを備える負極にリチウムをドープし、
リチウムをドープされた前記負極と、セパレータと、正極活物質層を備える正極とを順次積層して前記電極セルを形成し、
前記負極活物質層は、
前記正極活物質層と対向しない余剰領域Aと、
前記正極活物質層のうち、前記正極活物質層の端部から、前記正極活物質層の中心から前記端部までの長さの5%の長さだけ、前記中心の方向に延びる領域と対向する端部領域Bと、
前記余剰領域A及び前記端部領域B以外の中心領域Cと、
を有し、
前記正極と前記負極とを短絡させた後の前記余剰領域Aの負極電位VAと、前記正極と前記負極とを短絡させた後の前記中心領域Cの負極電位VCとが、以下の式(1)~(3)を充足するリチウムイオン二次電池の製造方法。
式(1) VA≦2.0V
式(2) VC≦1.0V
式(3) VA/VC≧0.7 - 電極セルを備えるリチウムイオン二次電池の製造方法であって、
負極集電体と、前記負極集電体の表面に形成された負極活物質層とを備える負極にリチウムをドープし、
リチウムをドープされた前記負極と、セパレータと、正極活物質層を備える正極とを順次積層して前記電極セルを形成し、
前記負極活物質層は、
前記正極活物質層と対向しない余剰領域Aと、
前記正極活物質層のうち、前記正極活物質層の端部から、前記正極活物質層の中心から前記端部までの長さの5%の長さだけ、前記中心の方向に延びる領域と対向する端部領域Bと、
前記余剰領域A及び前記端部領域B以外の中心領域Cと、
を有し、
充電状態で前記リチウムイオン二次電池を解体し、前記余剰領域Aの放電容量QAと、前記中心領域Cの放電容量QCとを測定した場合、以下の式(4)を充足するリチウムイオン二次電池の製造方法。
式(4) 0<QA<QC - 電極セルを備えるリチウムイオン二次電池の製造方法であって、
負極集電体と、前記負極集電体の表面に形成された負極活物質層とを備える負極にリチウムをドープし、
リチウムをドープされた前記負極と、セパレータと、正極活物質層を備える正極とを順次積層して前記電極セルを形成し、
前記負極活物質層は、
前記正極活物質層と対向しない余剰領域Aと、
前記正極活物質層のうち、前記正極活物質層の端部から、前記正極活物質層の中心から前記端部までの長さの5%の長さだけ、前記中心の方向に延びる領域と対向する端部領域Bと、
前記余剰領域A及び前記端部領域B以外の中心領域Cと、
を有し、
充電状態で前記リチウムイオン二次電池を解体し、前記余剰領域Aの放電容量QAと、前記端部領域Bの放電容量QBと、前記中心領域Cの放電容量QCとを測定した場合、以下の式(7)、(9)を充足するリチウムイオン二次電池の製造方法。
式(7) 0.7≦QB/QC≦0.99
式(9) QA/QC≦0.1
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020217042050A KR20220016125A (ko) | 2019-06-03 | 2020-02-26 | 축전 디바이스 및 리튬 이온 이차 전지의 제조 방법 |
US17/616,012 US20220320482A1 (en) | 2019-06-03 | 2020-02-26 | Power storage device and method for manufacturing lithium ion rechargeable battery |
EP20817719.6A EP3979363A4 (en) | 2019-06-03 | 2020-02-26 | ENERGY STORAGE DEVICE AND METHOD OF MAKING LITHIUM-ION BATTERY |
JP2021524669A JP7307165B2 (ja) | 2019-06-03 | 2020-02-26 | 蓄電デバイス及びリチウムイオン二次電池の製造方法 |
CN202080041461.7A CN113950756B (zh) | 2019-06-03 | 2020-02-26 | 蓄电装置以及锂离子二次电池的制造方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2019-103671 | 2019-06-03 | ||
JP2019103671 | 2019-06-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2020246081A1 true WO2020246081A1 (ja) | 2020-12-10 |
Family
ID=73652193
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2020/007734 WO2020246081A1 (ja) | 2019-06-03 | 2020-02-26 | 蓄電デバイス及びリチウムイオン二次電池の製造方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20220320482A1 (ja) |
EP (1) | EP3979363A4 (ja) |
JP (1) | JP7307165B2 (ja) |
KR (1) | KR20220016125A (ja) |
CN (1) | CN113950756B (ja) |
WO (1) | WO2020246081A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2024062876A1 (ja) * | 2022-09-22 | 2024-03-28 | パナソニックIpマネジメント株式会社 | 電気化学デバイス |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20210090818A1 (en) * | 2018-02-22 | 2021-03-25 | Jm Energy Corporation | Power storage device, power storage device electrode, and a method for manufacturing said power storage device and power storage device electrode |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07235330A (ja) | 1994-02-24 | 1995-09-05 | Sony Corp | 非水電解液二次電池の製造方法 |
JPH09293499A (ja) | 1996-04-25 | 1997-11-11 | Seiko Instr Kk | 非水電解質二次電池及びその製造方法 |
JP2004266091A (ja) | 2003-02-28 | 2004-09-24 | Kanebo Ltd | フィルム型蓄電装置 |
JP2007067105A (ja) | 2005-08-30 | 2007-03-15 | Fuji Heavy Ind Ltd | 捲回型リチウムイオンキャパシタ |
JP2012069894A (ja) | 2009-09-28 | 2012-04-05 | Sumitomo Chemical Co Ltd | ナトリウムイオン型蓄電デバイス |
JP2015002043A (ja) * | 2013-06-14 | 2015-01-05 | トヨタ自動車株式会社 | リチウムイオン二次電池 |
JP2019003789A (ja) * | 2017-06-14 | 2019-01-10 | オートモーティブエナジーサプライ株式会社 | リチウムイオン二次電池素子およびリチウムイオン二次電池 |
JP2019021393A (ja) * | 2017-07-11 | 2019-02-07 | 株式会社豊田自動織機 | リチウムイオン二次電池 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4212458B2 (ja) * | 2003-11-19 | 2009-01-21 | 三洋電機株式会社 | リチウム二次電池 |
JP4731967B2 (ja) * | 2005-03-31 | 2011-07-27 | 富士重工業株式会社 | リチウムイオンキャパシタ |
JP4705404B2 (ja) * | 2005-04-22 | 2011-06-22 | 富士重工業株式会社 | リチウムイオンキャパシタ |
WO2007026492A1 (ja) * | 2005-08-30 | 2007-03-08 | Fuji Jukogyo Kabushiki Kaisha | リチウムイオンキャパシタ |
JP2012169071A (ja) * | 2011-02-10 | 2012-09-06 | Panasonic Corp | リチウムイオン二次電池 |
JP6254360B2 (ja) * | 2013-04-25 | 2017-12-27 | Jmエナジー株式会社 | 蓄電デバイス |
JP6361920B2 (ja) * | 2014-09-05 | 2018-07-25 | トヨタ自動車株式会社 | リチウムイオン電池 |
US10217988B2 (en) * | 2015-01-30 | 2019-02-26 | Nec Energy Devices, Ltd. | Secondary battery |
JP6636712B2 (ja) * | 2015-03-25 | 2020-01-29 | 株式会社エンビジョンAescジャパン | リチウムイオン二次電池 |
JP6867821B2 (ja) * | 2016-02-23 | 2021-05-12 | 信越化学工業株式会社 | 負極活物質、混合負極活物質材料、非水電解質二次電池用負極、リチウムイオン二次電池用負極、リチウムイオン二次電池、負極活物質の製造方法、負極の製造方法、及びリチウムイオン二次電池の製造方法 |
JP2018006289A (ja) * | 2016-07-08 | 2018-01-11 | トヨタ自動車株式会社 | 非水電解質二次電池 |
JP2018032686A (ja) * | 2016-08-23 | 2018-03-01 | 日立化成株式会社 | リチウムイオンキャパシタ及びリチウムイオンキャパシタの製造方法 |
CN110024200B (zh) * | 2016-12-02 | 2023-07-18 | 株式会社半导体能源研究所 | 蓄电装置及电子设备 |
JP7139582B2 (ja) * | 2017-07-11 | 2022-09-21 | 株式会社豊田自動織機 | リチウムイオン二次電池 |
US20200219669A1 (en) * | 2017-07-18 | 2020-07-09 | Nissan Motor Co., Ltd. | Method for pre-doping negative electrode active material and method for manufacturing electrode for electric device and electric device |
-
2020
- 2020-02-26 EP EP20817719.6A patent/EP3979363A4/en active Pending
- 2020-02-26 JP JP2021524669A patent/JP7307165B2/ja active Active
- 2020-02-26 CN CN202080041461.7A patent/CN113950756B/zh active Active
- 2020-02-26 US US17/616,012 patent/US20220320482A1/en active Pending
- 2020-02-26 KR KR1020217042050A patent/KR20220016125A/ko unknown
- 2020-02-26 WO PCT/JP2020/007734 patent/WO2020246081A1/ja unknown
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07235330A (ja) | 1994-02-24 | 1995-09-05 | Sony Corp | 非水電解液二次電池の製造方法 |
JPH09293499A (ja) | 1996-04-25 | 1997-11-11 | Seiko Instr Kk | 非水電解質二次電池及びその製造方法 |
JP2004266091A (ja) | 2003-02-28 | 2004-09-24 | Kanebo Ltd | フィルム型蓄電装置 |
JP2007067105A (ja) | 2005-08-30 | 2007-03-15 | Fuji Heavy Ind Ltd | 捲回型リチウムイオンキャパシタ |
JP2012069894A (ja) | 2009-09-28 | 2012-04-05 | Sumitomo Chemical Co Ltd | ナトリウムイオン型蓄電デバイス |
JP2015002043A (ja) * | 2013-06-14 | 2015-01-05 | トヨタ自動車株式会社 | リチウムイオン二次電池 |
JP2019003789A (ja) * | 2017-06-14 | 2019-01-10 | オートモーティブエナジーサプライ株式会社 | リチウムイオン二次電池素子およびリチウムイオン二次電池 |
JP2019021393A (ja) * | 2017-07-11 | 2019-02-07 | 株式会社豊田自動織機 | リチウムイオン二次電池 |
Non-Patent Citations (1)
Title |
---|
See also references of EP3979363A4 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2024062876A1 (ja) * | 2022-09-22 | 2024-03-28 | パナソニックIpマネジメント株式会社 | 電気化学デバイス |
Also Published As
Publication number | Publication date |
---|---|
CN113950756B (zh) | 2024-01-02 |
KR20220016125A (ko) | 2022-02-08 |
EP3979363A1 (en) | 2022-04-06 |
CN113950756A (zh) | 2022-01-18 |
JPWO2020246081A1 (ja) | 2020-12-10 |
EP3979363A4 (en) | 2023-08-02 |
US20220320482A1 (en) | 2022-10-06 |
JP7307165B2 (ja) | 2023-07-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5040626B2 (ja) | 電力貯蔵デバイスセルおよびその制御方法 | |
CN105047910B (zh) | 非水电解液二次电池及其组装体 | |
US8349503B2 (en) | Nonaqueous ionic liquid and lithium ion electrolyte battery | |
KR102040192B1 (ko) | 코팅 분리막 및 이를 포함하는 전기화학소자 | |
WO2013150937A1 (ja) | リチウムイオン二次電池 | |
KR101862433B1 (ko) | 리튬 이온 캐패시터 | |
CN107112584B (zh) | 非水电解液二次电池和非水电解液二次电池的正极 | |
JP2009200302A (ja) | 蓄電デバイスの製造方法および蓄電デバイス | |
JP2017011068A (ja) | 蓄電デバイス用電極の製造方法および前記電極の製造装置 | |
WO2020246081A1 (ja) | 蓄電デバイス及びリチウムイオン二次電池の製造方法 | |
JP2018137133A (ja) | 非水電解質蓄電素子用の負極、非水電解質蓄電素子及び非水電解質蓄電素子用の負極の製造方法 | |
WO2019077919A1 (ja) | 非水電解質蓄電素子及び非水電解質蓄電素子の製造方法 | |
EP3098822A1 (en) | Energy storage device | |
JP6487841B2 (ja) | 蓄電デバイス | |
JP7343485B2 (ja) | リチウムイオン二次電池 | |
JP6254360B2 (ja) | 蓄電デバイス | |
JP4817484B2 (ja) | 非水電解液およびそれを含む非水電気化学装置 | |
JP2017182917A (ja) | リチウムイオン二次電池及びその製造方法、ならびに組電池 | |
US20190295783A1 (en) | Electrolyte liquid for electrochemical device and electrochemical device | |
JP2017134974A (ja) | リチウム二次電池 | |
US20210050625A1 (en) | Non-aqueous electrolyte secondary battery, electrolyte solution, and method for producing non-aqueous electrolyte secondary battery | |
US10707519B2 (en) | Lithium ion secondary battery | |
EP3637514B1 (en) | Electrode for secondary battery and secondary battery | |
WO2018180829A1 (ja) | 蓄電素子 | |
JP2021039820A (ja) | 活物質と導電性炭素材料からなる複合体を含むリチウムイオン二次電池用電極の製造方法 |
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: 20817719 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2021524669 Country of ref document: JP Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 20217042050 Country of ref document: KR Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 2020817719 Country of ref document: EP Effective date: 20220103 |