CN114464888A - Overcharge-preventing electrolyte and lithium battery - Google Patents
Overcharge-preventing electrolyte and lithium battery Download PDFInfo
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- CN114464888A CN114464888A CN202210092094.4A CN202210092094A CN114464888A CN 114464888 A CN114464888 A CN 114464888A CN 202210092094 A CN202210092094 A CN 202210092094A CN 114464888 A CN114464888 A CN 114464888A
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- Prior art keywords
- overcharge
- electrolyte
- lithium
- additive
- battery
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 64
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 23
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 239000000654 additive Substances 0.000 claims abstract description 57
- 230000000996 additive effect Effects 0.000 claims abstract description 48
- 229910003002 lithium salt Inorganic materials 0.000 claims abstract description 23
- 159000000002 lithium salts Chemical class 0.000 claims abstract description 23
- 239000011356 non-aqueous organic solvent Substances 0.000 claims abstract description 13
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 5
- 239000010452 phosphate Substances 0.000 claims abstract description 5
- 230000002265 prevention Effects 0.000 claims abstract description 5
- -1 trimethylsiloxy, fluorotrimethylsiloxy Chemical group 0.000 claims description 38
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 23
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 18
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 claims description 16
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 13
- 125000004432 carbon atom Chemical group C* 0.000 claims description 12
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 9
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 claims description 6
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims description 6
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 6
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 6
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 6
- FKRCODPIKNYEAC-UHFFFAOYSA-N ethyl propionate Chemical compound CCOC(=O)CC FKRCODPIKNYEAC-UHFFFAOYSA-N 0.000 claims description 6
- IGILRSKEFZLPKG-UHFFFAOYSA-M lithium;difluorophosphinate Chemical compound [Li+].[O-]P(F)(F)=O IGILRSKEFZLPKG-UHFFFAOYSA-M 0.000 claims description 6
- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 claims description 6
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 claims description 5
- MGAFPXGQLWFEPK-UHFFFAOYSA-N 1,3,2-dioxathiepane 2,2-dioxide Chemical compound O=S1(=O)OCCCCO1 MGAFPXGQLWFEPK-UHFFFAOYSA-N 0.000 claims description 3
- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 claims description 3
- WNXJIVFYUVYPPR-UHFFFAOYSA-N 1,3-dioxolane Chemical compound C1COCO1 WNXJIVFYUVYPPR-UHFFFAOYSA-N 0.000 claims description 3
- WXBWKMLIVXELSF-UHFFFAOYSA-N 2,2,2-trifluoro-n,n-dimethylacetamide Chemical compound CN(C)C(=O)C(F)(F)F WXBWKMLIVXELSF-UHFFFAOYSA-N 0.000 claims description 3
- UHOPWFKONJYLCF-UHFFFAOYSA-N 2-(2-sulfanylethyl)isoindole-1,3-dione Chemical compound C1=CC=C2C(=O)N(CCS)C(=O)C2=C1 UHOPWFKONJYLCF-UHFFFAOYSA-N 0.000 claims description 3
- OQXNUCOGMMHHNA-UHFFFAOYSA-N 4-methyl-1,3,2-dioxathiolane 2,2-dioxide Chemical compound CC1COS(=O)(=O)O1 OQXNUCOGMMHHNA-UHFFFAOYSA-N 0.000 claims description 3
- SJHAYVFVKRXMKG-UHFFFAOYSA-N 4-methyl-1,3,2-dioxathiolane 2-oxide Chemical compound CC1COS(=O)O1 SJHAYVFVKRXMKG-UHFFFAOYSA-N 0.000 claims description 3
- FERIUCNNQQJTOY-UHFFFAOYSA-M Butyrate Chemical compound CCCC([O-])=O FERIUCNNQQJTOY-UHFFFAOYSA-M 0.000 claims description 3
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims description 3
- JGFBQFKZKSSODQ-UHFFFAOYSA-N Isothiocyanatocyclopropane Chemical compound S=C=NC1CC1 JGFBQFKZKSSODQ-UHFFFAOYSA-N 0.000 claims description 3
- RJUFJBKOKNCXHH-UHFFFAOYSA-N Methyl propionate Chemical compound CCC(=O)OC RJUFJBKOKNCXHH-UHFFFAOYSA-N 0.000 claims description 3
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 claims description 3
- 125000003545 alkoxy group Chemical group 0.000 claims description 3
- 125000000217 alkyl group Chemical group 0.000 claims description 3
- PWLNAUNEAKQYLH-UHFFFAOYSA-N butyric acid octyl ester Natural products CCCCCCCCOC(=O)CCC PWLNAUNEAKQYLH-UHFFFAOYSA-N 0.000 claims description 3
- BWOVZCWSJFYBRM-UHFFFAOYSA-N carbononitridic isocyanate Chemical compound O=C=NC#N BWOVZCWSJFYBRM-UHFFFAOYSA-N 0.000 claims description 3
- VEWLDLAARDMXSB-UHFFFAOYSA-N ethenyl sulfate;hydron Chemical compound OS(=O)(=O)OC=C VEWLDLAARDMXSB-UHFFFAOYSA-N 0.000 claims description 3
- 229940093499 ethyl acetate Drugs 0.000 claims description 3
- 239000011737 fluorine Substances 0.000 claims description 3
- 229910052731 fluorine Inorganic materials 0.000 claims description 3
- 125000004428 fluoroalkoxy group Chemical group 0.000 claims description 3
- 125000003709 fluoroalkyl group Chemical group 0.000 claims description 3
- WBJINCZRORDGAQ-UHFFFAOYSA-N formic acid ethyl ester Natural products CCOC=O WBJINCZRORDGAQ-UHFFFAOYSA-N 0.000 claims description 3
- MHCFAGZWMAWTNR-UHFFFAOYSA-M lithium perchlorate Chemical compound [Li+].[O-]Cl(=O)(=O)=O MHCFAGZWMAWTNR-UHFFFAOYSA-M 0.000 claims description 3
- 229910001486 lithium perchlorate Inorganic materials 0.000 claims description 3
- 229910001537 lithium tetrachloroaluminate Inorganic materials 0.000 claims description 3
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 claims description 3
- VDVLPSWVDYJFRW-UHFFFAOYSA-N lithium;bis(fluorosulfonyl)azanide Chemical compound [Li+].FS(=O)(=O)[N-]S(F)(=O)=O VDVLPSWVDYJFRW-UHFFFAOYSA-N 0.000 claims description 3
- QSZMZKBZAYQGRS-UHFFFAOYSA-N lithium;bis(trifluoromethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F QSZMZKBZAYQGRS-UHFFFAOYSA-N 0.000 claims description 3
- MCVFFRWZNYZUIJ-UHFFFAOYSA-M lithium;trifluoromethanesulfonate Chemical compound [Li+].[O-]S(=O)(=O)C(F)(F)F MCVFFRWZNYZUIJ-UHFFFAOYSA-M 0.000 claims description 3
- 229940017219 methyl propionate Drugs 0.000 claims description 3
- MPDOUGUGIVBSGZ-UHFFFAOYSA-N n-(cyclobutylmethyl)-3-(trifluoromethyl)aniline Chemical compound FC(F)(F)C1=CC=CC(NCC2CCC2)=C1 MPDOUGUGIVBSGZ-UHFFFAOYSA-N 0.000 claims description 3
- YKYONYBAUNKHLG-UHFFFAOYSA-N n-Propyl acetate Natural products CCCOC(C)=O YKYONYBAUNKHLG-UHFFFAOYSA-N 0.000 claims description 3
- UUIQMZJEGPQKFD-UHFFFAOYSA-N n-butyric acid methyl ester Natural products CCCC(=O)OC UUIQMZJEGPQKFD-UHFFFAOYSA-N 0.000 claims description 3
- MHYFEEDKONKGEB-UHFFFAOYSA-N oxathiane 2,2-dioxide Chemical compound O=S1(=O)CCCCO1 MHYFEEDKONKGEB-UHFFFAOYSA-N 0.000 claims description 3
- 229940090181 propyl acetate Drugs 0.000 claims description 3
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 3
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 3
- 125000001889 triflyl group Chemical group FC(F)(F)S(*)(=O)=O 0.000 claims description 3
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 claims description 3
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 claims description 3
- RBBXSUBZFUWCAV-UHFFFAOYSA-N ethenyl hydrogen sulfite Chemical compound OS(=O)OC=C RBBXSUBZFUWCAV-UHFFFAOYSA-N 0.000 claims description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 24
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 24
- 238000007254 oxidation reaction Methods 0.000 abstract description 12
- 230000003647 oxidation Effects 0.000 abstract description 11
- 238000006116 polymerization reaction Methods 0.000 abstract description 10
- 238000007086 side reaction Methods 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 125000004185 ester group Chemical group 0.000 abstract description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 abstract description 2
- 239000002904 solvent Substances 0.000 description 31
- 238000012360 testing method Methods 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 11
- MYDRVGSMITUBGZ-UHFFFAOYSA-N 2-hydroxy-1,3,2$l^{5}-dioxaphosphole 2-oxide Chemical compound OP1(=O)OC=CO1 MYDRVGSMITUBGZ-UHFFFAOYSA-N 0.000 description 10
- KKUKTXOBAWVSHC-UHFFFAOYSA-N Dimethylphosphate Chemical compound COP(O)(=O)OC KKUKTXOBAWVSHC-UHFFFAOYSA-N 0.000 description 10
- 238000002156 mixing Methods 0.000 description 10
- 238000003756 stirring Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 239000006258 conductive agent Substances 0.000 description 4
- 239000008151 electrolyte solution Substances 0.000 description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007773 negative electrode material Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000002000 Electrolyte additive Substances 0.000 description 2
- 229910013716 LiNi Inorganic materials 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000002041 carbon nanotube Substances 0.000 description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 2
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Chemical class C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000011267 electrode slurry Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- WDXYVJKNSMILOQ-UHFFFAOYSA-N 1,3,2-dioxathiolane 2-oxide Chemical compound O=S1OCCO1 WDXYVJKNSMILOQ-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
- OMIHGPLIXGGMJB-UHFFFAOYSA-N 7-oxabicyclo[4.1.0]hepta-1,3,5-triene Chemical class C1=CC=C2OC2=C1 OMIHGPLIXGGMJB-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 1
- SOXUFMZTHZXOGC-UHFFFAOYSA-N [Li].[Mn].[Co].[Ni] Chemical compound [Li].[Mn].[Co].[Ni] SOXUFMZTHZXOGC-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000006256 anode slurry Substances 0.000 description 1
- MGWMSYKFRXLOAA-UHFFFAOYSA-N benzenesulfonic acid;phosphoric acid Chemical compound OP(O)(O)=O.OS(=O)(=O)C1=CC=CC=C1 MGWMSYKFRXLOAA-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000010290 biphenyl Nutrition 0.000 description 1
- 239000004305 biphenyl Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- HHNHBFLGXIUXCM-GFCCVEGCSA-N cyclohexylbenzene Chemical compound [CH]1CCCC[C@@H]1C1=CC=CC=C1 HHNHBFLGXIUXCM-GFCCVEGCSA-N 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910003473 lithium bis(trifluoromethanesulfonyl)imide Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009783 overcharge test Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to an overcharge-proof electrolyte and a lithium battery, wherein the electrolyte consists of lithium salt, a non-aqueous organic solvent and an additive, the additive comprises an overcharge-proof additive, and the lithium salt accounts for 2-20% of the weight of the electrolyte; the overcharge-preventing additive accounts for 0.01 to 20 percent of the weight of the electrolyte; the nonaqueous organic solvent accounts for 70-90% of the weight of the electrolyte; the over-filling prevention additive contains phenylate derivatives with phosphate sulfonic ester groups, and the general structural formula is
Description
Technical Field
The invention belongs to the technical field of electrochemistry, and particularly relates to an overcharge-preventing electrolyte and a lithium battery.
Background
With the wide application of lithium ion batteries in energy storage systems such as wind power, fire power and solar power stations, electric vehicles, electric bicycles, electric tools, medical instruments, aerospace, consumer electronics, military industry and other fields, the safety problem of lithium ion batteries is receiving more and more attention from people. Generally, lithium ion batteries cause thermal runaway under the conditions of short circuit, puncture, impact, overheating, overcharge and other extreme conditions, wherein the thermal runaway caused by overcharge is particularly serious. In order to prevent the occurrence of safety problems caused by overcharge of the battery, the conventional method is to modify the battery material or use a circuit breaking protection device, an explosion-proof safety device, and a voltage sensitive film in the battery, which cannot completely solve the overcharge safety problem of the lithium ion battery. The new solution idea is to use the overcharge-preventing electrolyte additive, and the method is safe, effective and very convenient.
The types of the overcharge-preventing electrolyte additives are mainly divided into two types: one is based on the reaction principle of a redox method, an additive is subjected to redox, the additive is oxidized on the positive electrode side when the voltage of the battery reaches a certain degree and is diffused to the negative electrode side to be reduced, so that the overcharge effect of the battery is relieved, the additive usually has a lower oxidation potential, and the oxidation reaction occurs when the normal working voltage of the lithium ion battery is not reached, so that the exertion of the capacity of the lithium ion battery is influenced; the other is an electropolymerization additive, which can generate polymerization reaction under a certain voltage, and a polymerization product covers the surface of an electrode, so that the internal resistance of the battery is increased, the charging current is reduced, and the overcharge safety problem can be effectively solved.
Disclosure of Invention
In view of the above, it is necessary to provide an overcharge-preventing electrolyte and a lithium battery, which are directed to the problems of an overcharge-preventing additive such as an excessively low oxidation potential and a decrease in charging efficiency due to an increase in internal resistance of the battery.
In order to achieve the above object, in a first aspect of the present invention, there is provided an overcharge-preventing electrolyte comprising a lithium salt, a nonaqueous organic solvent and an additive including an overcharge-preventing additive comprising a phosphoric acid sulfonate-based phenylene ether derivative having a general structural formula of
Said anti-overcharging additionIn the agent R1、R2、R3Respectively is one of fluorine, cyano, isocyanate, trimethylsilyl, fluorotrimethylsilyl, trimethylsiloxy, fluorotrimethylsiloxy, fluorosulfonyl, trifluoromethanesulfonyl, fluorosulfonylimide lithium sulfonyl, trifluoromethanesulfonylimide lithium sulfonyl, trifluoromethanesulfonimide lithium sulfonyl, lithiumoxy, alkyl with 1-6 carbon atoms, fluoroalkyl with 1-6 carbon atoms, alkoxy with 1-6 carbon atoms and fluoroalkoxy with 1-6 carbon atoms.
Further, the lithium salt accounts for 2-20% of the weight of the electrolyte.
Further, the lithium salt is one or more of lithium hexafluorophosphate, lithium bis (oxalato) borate, lithium difluorophosphate, lithium difluoro (oxalato) borate, lithium bis (fluorosulfonyl) imide, lithium bis (trifluoromethanesulfonyl) imide, lithium trifluoromethanesulfonate, lithium tetrafluoroborate, lithium perchlorate, (fluorosulfonyl) trifluoromethanesulfonylimide, lithium tetrachloroaluminate and lithium hexafluoroarsenate.
Further, the percentage of the overcharge-preventing additive in the electrolyte is 0.01-20 wt%.
Further, the nonaqueous organic solvent accounts for 70-90% of the weight of the electrolyte.
Further, the non-aqueous organic solvent is one or more of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, vinylene carbonate, ethylene carbonate, fluoroethylene carbonate, methyl formate, ethyl formate, propyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, gamma-butyrolactone, dioxolane, tetrahydrofuran, dimethyl trifluoroacetamide and dimethyl sulfoxide.
Further, the additive also comprises other additives, and the other additives account for 0.1-10% of the electrolyte by weight.
Further, the other additive is one or a combination of more of vinylene carbonate, ethylene carbonate, fluoroethylene carbonate, 1, 3-propane sultone, 1, 4-butane sultone, vinyl sulfate, ethylene sulfite, propylene sulfate, propylene sulfite, butylene sulfate and lithium difluorophosphate.
In a second aspect of the present invention, there is provided a lithium battery including a positive electrode sheet, a negative electrode sheet, an electrolyte, and a separator disposed between the positive electrode sheet and the negative electrode sheet. Wherein the electrolyte is the overcharge-preventing electrolyte of the first aspect of the present invention.
Has the advantages that: the overcharge-preventing lithium ion battery electrolyte consists of lithium salt, a non-aqueous organic solvent and an additive, wherein the additive comprises an overcharge-preventing additive, the overcharge-preventing additive contains a phenyl ether derivative with a phosphate sulfonate group, and the general structural formula is
When the battery is close to the overcharge voltage, the anode is in a high potential state, the oxidability is increased, the overcharge-preventing additive is promoted to be oxidized and polymerized on the surface of the anode, the formed polymerization layer increases the transmission resistance of lithium ions, the internal resistance of the battery is improved, the charging current is limited, the overcharge is prevented, and the overcharge safety of the battery is effectively improved. The overcharge-preventing additive contains a large amount of ester groups and other groups with strong electron-withdrawing capability, can optimize the properties of an SEI film at a negative electrode interface, reduce the problem of internal resistance increase caused by electrode side reaction, and improve the influence of the internal resistance of the battery on the cycle stability and the charging efficiency of the battery. When the battery is charged, the positive electrode potential rises, the overcharge-preventing additive is prevented from being oxidized and carrying out polymerization reaction, and the oxidation potential is higher when the overcharge-preventing additive is oxidized at the moment, high-potential oxidation resistance is high, and the battery is suitable for ternary high-voltage systems and the like.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The overcharge-preventing electrolyte and the lithium battery according to the present invention will be described below with reference to examples, comparative examples, test procedures, and test results.
First, the overcharge-preventing electrolyte solution of the first aspect of the invention is explained.
An overcharge-preventing electrolyte solution comprises a lithium salt, a nonaqueous organic solvent and an additive. The additives include an anti-overcharge additive and other additives, the anti-overcharge additive contains a phenyl ether derivative of a phosphoric acid sulfonate group and has a general formula of
Wherein R is1、R2、R3Respectively is one of fluorine, cyano, isocyanate, trimethylsilyl, fluorotrimethylsilyl, trimethylsiloxy, fluorotrimethylsiloxy, fluorosulfonyl, trifluoromethanesulfonyl, fluorosulfonylimide lithium sulfonyl, trifluoromethanesulfonylimide lithium sulfonyl, trifluoromethanesulfonimide lithium sulfonyl, lithiumoxy, alkyl with 1-6 carbon atoms, fluoroalkyl with 1-6 carbon atoms, alkoxy with 1-6 carbon atoms and fluoroalkoxy with 1-6 carbon atoms.
In the overcharge-preventing electrolyte of the first aspect of the invention, when the battery is close to the overcharge voltage, the anode is in a high potential state, the oxidability is increased, the overcharge-preventing additive is promoted to be oxidized and polymerized on the surface of the anode, and the formed polymerization layer can increase the resistance of lithium ion transmission, increase the internal resistance of the battery, and limit the charging current, thereby realizing overcharge prevention. And secondly, the overcharge-preventing additive contains a large number of ester groups and other groups with strong electron-withdrawing capability, so that the property of an SEI (solid electrolyte interphase) film at the interface of the negative electrode can be optimized, the compatibility between the electrolyte and the negative electrode material is improved, the problems of internal resistance increase and the like caused by electrode side reaction are reduced, and the influence of the internal resistance of the battery on the cycle stability and the service life of the battery is further improved. And thirdly, the positive electrode potential of the battery is increased during charging, when the battery is about to be subjected to overvoltage, the overcharge-preventing additive is in an optimal state of being oxidized and subjected to polymerization reaction, the lowest potential during oxidation is high, and the high-potential oxidation resistance is strong, so that the battery can be suitable for ternary high-voltage systems and the like.
In the overcharge-preventing electrolyte of the first aspect of the present invention, the weight of the lithium salt is 2% to 20% of the total weight of the overcharge-preventing electrolyte, the weight of the non-aqueous organic solvent is 70% to 90% of the total weight of the overcharge-preventing electrolyte, the weight of the overcharge-preventing additive is 0.01% to 20% of the total weight of the overcharge-preventing electrolyte, and the weight of the other additives is 0.1% to 10% of the total weight of the overcharge-preventing electrolyte.
In the overcharge-preventing electrolyte solution of the first aspect of the present invention, the lithium salt may be selected from at least one of lithium hexafluorophosphate, lithium bis (oxalato) borate, lithium difluorophosphate, lithium difluorooxalato borate, lithium bis (fluorosulfonyl) imide, lithium bis (trifluoromethylsulfonyl) imide, lithium trifluoromethanesulfonate, lithium tetrafluoroborate, lithium perchlorate, (fluorosulfonyl) trifluoromethylsulfonyl imide, lithium tetrachloroaluminate, and lithium hexafluoroarsenate.
In the overcharge-preventing electrolyte of the first aspect of the present invention, the non-aqueous organic solvent may be selected from at least one of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, vinylene carbonate, ethylene carbonate, fluoroethylene carbonate, methyl formate, ethyl formate, propyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, γ -butyrolactone, dioxolane, tetrahydrofuran, dimethyl trifluoroacetamide, and dimethyl sulfoxide.
In the overcharge-preventing electrolyte solution of the first aspect of the present invention, the other additive may be at least one selected from vinylene carbonate, vinyl ethylene carbonate, fluoroethylene carbonate, 1, 3-propane sultone, 1, 4-butane sultone, vinyl sulfate, vinyl sulfite, propylene sulfate, propylene sulfite, butylene sulfate, and lithium difluorophosphate.
Next, a lithium ion battery according to a second aspect of the present invention will be described.
A lithium ion battery includes: the diaphragm is arranged between the positive plate and the negative plate, and the electrolyte is the overcharge-preventing electrolyte of the first aspect of the invention.
In the lithium ion battery of the second aspect of the invention, the positive electrode material of the positive electrode sheet includes lithium nickel cobalt manganese (LiNi)0.5Co0.2Mn0.3) The conductive agent SuperP, the carbon nano tube, the polyvinylidene fluoride and the aluminum foil.
In the lithium ion battery of the second aspect of the invention, the negative electrode material of the negative electrode sheet comprises graphite, a conductive agent SuperP, carboxymethyl cellulose, styrene-butadiene rubber, deionized water and copper foil.
Next, examples and comparative examples of the overcharge-preventing electrolyte and lithium ion battery of the present invention will be described.
The first step is as follows: preparation of the electrolyte
The following examples and comparative examples used an overcharge inhibitor having the following structural formula:
formula 1: 3-Trifluoromethylsiloxy-4-cyano-5-trifluoromethanesulfonyl benzene sulfonic acid phosphate ester
Formula 2: 3-fluoro-4-trifluoromethanesulfonimide lithium sulfonyl-5-perfluorohexyloxy benzene sulfonic acid phosphate ester
Formula 3: 3-lithioxy-4-trifluoromethanesulfonic acid-5-isocyanatosulfonic acid phosphate ester
Example 1:
uniformly mixing ethylene carbonate (EC, solvent), dimethyl phosphate (DMC, solvent) and methyl ethyl carbonate (EMC, solvent) according to the mass ratio of EC: DMC: EMC ═ 2:3:5, adding hexafluorophosphate until the concentration of lithium salt is 1mol/L, adding 0.5% by mass of 3-trifluoromethylsiloxy-4-cyano-5-trifluoromethylsulfonyl benzene sulfonic acid phosphate, 2% by mass of vinylene phosphate and 1% by mass of fluoroethylene carbonate, and dissolving and uniformly stirring to obtain the required electrolyte.
Example 2:
uniformly mixing ethylene carbonate (EC, solvent), dimethyl phosphate (DMC, solvent) and methyl ethyl carbonate (EMC, solvent) according to the mass ratio of EC: DMC: EMC ═ 2:3:5, adding hexafluorophosphate until the concentration of lithium salt is 1mol/L, adding 1% by mass of 3-trifluoromethylsiloxy-4-cyano-5-trifluoromethylsulfonyl benzene sulfonic acid phosphate, 2% by mass of vinylene phosphate and 1% by mass of fluoroethylene carbonate, and dissolving and uniformly stirring to obtain the required electrolyte.
Example 3:
uniformly mixing ethylene carbonate (EC, solvent), dimethyl phosphate (DMC, solvent) and methyl ethyl carbonate (EMC, solvent) according to the mass ratio of EC: DMC: EMC ═ 2:3:5, adding hexafluorophosphate until the concentration of lithium salt is 1mol/L, adding 2 mass percent of 3-trifluoromethylsiloxy-4-cyano-5-trifluoromethylsulfonyl benzene sulfonic acid phosphate, 2 mass percent of vinylene phosphate and 1 mass percent of fluoroethylene carbonate, and dissolving and uniformly stirring to obtain the required electrolyte.
Example 4:
uniformly mixing ethylene carbonate (EC, solvent), dimethyl phosphate (DMC, solvent) and methyl ethyl carbonate (EMC, solvent) according to the mass ratio of EC: DMC: EMC ═ 2:3:5, adding hexafluorophosphate until the concentration of lithium salt is 1mol/L, adding 5% by mass of 3-trifluoromethylsiloxy-4-cyano-5-trifluoromethylsulfonyl benzene sulfonic acid phosphate, 2% by mass of vinylene phosphate and 1% by mass of fluoroethylene carbonate, and dissolving and uniformly stirring to obtain the required electrolyte.
Example 5:
uniformly mixing ethylene carbonate (EC, solvent), dimethyl phosphate (DMC, solvent) and methyl ethyl carbonate (EMC, solvent) according to the mass ratio of EC: DMC: EMC ═ 2:3:5, adding hexafluorophosphate until the concentration of lithium salt is 1mol/L, adding 10% by mass of 3-trifluoromethylsiloxy-4-cyano-5-trifluoromethylsulfonyl benzene sulfonic acid phosphate, 2% by mass of vinylene phosphate and 1% by mass of fluoroethylene carbonate, and dissolving and uniformly stirring to obtain the required electrolyte.
Example 6:
uniformly mixing ethylene carbonate (EC, solvent), dimethyl phosphate (DMC, solvent) and methyl ethyl carbonate (EMC, solvent) according to the mass ratio of EC: DMC: EMC ═ 2:3:5, adding hexafluorophosphate until the concentration of lithium salt is 1mol/L, adding 5% by mass of 3-fluoro-4-trifluoromethanesulfonimide lithium sulfonyl-5-perfluorohexyloxy benzene sulfonic acid phosphate, 2% by mass of vinylene phosphate and 1% by mass of fluoroethylene carbonate, and dissolving and stirring uniformly to obtain the required electrolyte.
Example 7:
uniformly mixing ethylene carbonate (EC, solvent), dimethyl phosphate (DMC, solvent) and methyl ethyl carbonate (EMC, solvent) according to the mass ratio of EC: DMC: EMC ═ 2:3:5, adding hexafluorophosphate until the concentration of lithium salt is 1mol/L, adding 5% by mass of 3-lithioxy-4-trifluoromethanesulfonic acid-5-isocyanato sulfonic acid phosphate, 2% by mass of vinylene phosphate and 1% by mass of fluoroethylene carbonate respectively, and dissolving and uniformly stirring to obtain the required electrolyte.
Comparative example 1:
uniformly mixing ethylene carbonate (EC, solvent), dimethyl phosphate (DMC, solvent) and methyl ethyl carbonate (EMC, solvent) according to the mass ratio of EC: DMC: EMC ═ 2:3:5, adding hexafluorophosphate until the concentration of lithium salt is 1mol/L, adding vinylene phosphate and fluoroethylene carbonate with the mass percentage of 2% and 1% respectively, and dissolving and uniformly stirring to obtain the required electrolyte.
Comparative example 2:
uniformly mixing ethylene carbonate (EC, solvent), dimethyl phosphate (DMC, solvent) and methyl ethyl carbonate (EMC, solvent) according to the mass ratio of EC: DMC: EMC ═ 2:3:5, adding hexafluorophosphate until the concentration of lithium salt is 1mol/L, adding vinylene phosphate with the mass percentage of 2%, fluoroethylene carbonate with the mass percentage of 1% and biphenyl with the mass percentage of 5%, and dissolving and uniformly stirring to obtain the required electrolyte.
Comparative example 3:
uniformly mixing ethylene carbonate (EC, solvent), dimethyl phosphate (DMC, solvent) and methyl ethyl carbonate (EMC, solvent) according to the mass ratio of EC: DMC: EMC ═ 2:3:5, adding hexafluorophosphate until the concentration of lithium salt is 1mol/L, adding vinylene phosphate with the mass percentage of 2%, fluoroethylene carbonate with the mass percentage of 1% and cyclohexylbenzene with the mass percentage of 5%, and dissolving and uniformly stirring to obtain the required electrolyte.
The second step is that: preparation of lithium ion battery
(1) Preparing a positive plate:
preparing positive electrode material nickel cobalt lithium manganate (LiNi)0.5Co0.2Mn0.3) Uniformly dispersing Super P, a conductive agent, a carbon nano tube and polyvinylidene fluoride in an N, N-dimethyl pyrrolidone solvent according to a mass ratio of 95.5:1.5:1.5:1.5 to prepare anode slurry; and uniformly coating the dispersed slurry on an aluminum foil with the thickness of 14 mu m, drying in a blast oven at 80 ℃, rolling and die-cutting to obtain the positive plate.
(2) Preparing a negative plate:
uniformly dispersing graphite, a conductive agent SuperP, carboxymethyl cellulose and styrene butadiene rubber in deionized water according to a mass ratio of 94:3:2: 1 to prepare negative electrode slurry; and coating the dispersed negative electrode slurry on a copper foil with the thickness of 10 mu m, drying in a blast oven at 80 ℃, rolling and die-cutting to prepare a negative electrode plate.
(3) Preparing a lithium ion battery:
and (3) preparing the positive plate, the negative plate and the diaphragm (the positive plate, the negative plate, the diaphragm and the electrolyte) into a pole core according to a lamination process, packaging the pole core into an aluminum-plastic film, and carrying out top side sealing, baking, liquid injection, formation and other processes to prepare the soft package battery.
And finally, giving a performance test and a test result of the lithium ion battery.
Testing I, testing normal temperature performance:
the lithium ion batteries of examples and comparative examples were respectively charged at 25 ℃ at a constant current of 1C to a voltage of 4.6V, charged at a constant voltage of 4.6V to a current of 0.05C, and then discharged at a constant current of 1C to a voltage of 3V, and cycled 500 times.
Test II and DC impedance test:
the lithium ion batteries of examples and comparative examples were charged to a state of charge of 50% SOC, respectively, and after standing for 30min, the sampling voltage V at the time of starting discharge was recorded0Then, the sampling voltage V at the end of recording and playing is recorded after discharging for 10s with 3C current I1Calculating the DC discharge impedance DCR (V) of the experimental current0-V1)/I。
Testing III, testing overcharge performance:
the lithium ion batteries of examples 1 to 7 and comparative examples 1 to 3 were overcharged to a state of charge (SOC) of 200% at a charging rate of 1C, respectively, and were maintained for 1h, then 1C was discharged to a voltage of 3V, and the charging and discharging voltage interval was set to 3 to 6V, and 3 charging and discharging cycles were performed, and the voltage at each stage during the battery cycling process was recorded, and if the voltage at each stage of the battery during the test did not exceed 4.8V and the phenomena of leakage, ignition, and explosion did not occur during the overcharge process, it was indicated that the overcharge test of the battery passed, otherwise, the battery was considered to have failed to prevent overcharge.
TABLE 1 test results of Normal temperature Performance test, DC impedance test and overcharge Performance of lithium ion batteries prepared in examples 1 to 7 and comparative examples 1 to 3
TABLE 1
From the test results of the embodiments 1 to 7 and the comparative examples 1 to 3, the electrolyte provided by the invention is considered to have a good use effect in ternary materials, and can effectively improve the overcharge prevention safety of the battery; compared with the traditional overcharge-resistant electrolyte, the electrolyte provided by the invention reduces the side reaction of the electrode, has no obvious effect on increasing the internal resistance of the battery, and has little influence on the cycle stability and the service life of the battery.
In summary, the overcharge-resistant lithium ion battery electrolyte consists of lithium salt, an overcharge-resistant additive, a non-aqueous organic solvent and an additive, wherein the additive comprises the overcharge-resistant additive and other additives, and the general structural formula of the overcharge-resistant additive is shown in the specification
The overcharge-preventing additive contains a phenylate derivative of a phosphoric acid sulfonate group, oxidation occurs when the battery is overcharged, polymerization reaction occurs on the surface of an electrode, a polymerization layer increases the resistance of lithium ion transmission, and the internal resistance of the battery is increased, so that the overcharge-preventing function is realized, and the overcharge safety of the battery is effectively improved; the addition of the overcharge-preventing additive brings a large number of ester groups and other groups with strong electron-withdrawing ability into the electrolyte, optimizes the property of an SEI film at a negative electrode interface, improves the compatibility between the electrolyte and a negative electrode material, and reduces the problem of internal resistance increase caused by electrode side reaction, so that the internal resistance of the battery cannot be obviously increased, the influence on the cycle stability and the charging efficiency of the battery is small, and meanwhile, the overcharge-preventing additive has high minimum potential, high oxidation potential and strong high-potential oxidation resistance when being oxidized, and is suitable for ternary high-voltage systems and the like.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. The overcharge-preventing electrolyte is characterized by comprising a lithium salt, a non-aqueous organic solvent and an additive, wherein the additive comprises an overcharge-preventing additive, the overcharge-preventing additive contains a phenylate derivative with a phosphate sulfonate group, and the structural general formula is
R in the anti-overcharge additive1、R2、R3Respectively is one of fluorine, cyano, isocyanate, trimethylsilyl, fluorotrimethylsilyl, trimethylsiloxy, fluorotrimethylsiloxy, fluorosulfonyl, trifluoromethanesulfonyl, fluorosulfonylimide lithium sulfonyl, trifluoromethanesulfonylimide lithium sulfonyl, trifluoromethanesulfonimide lithium sulfonyl, lithiumoxy, alkyl with 1-6 carbon atoms, fluoroalkyl with 1-6 carbon atoms, alkoxy with 1-6 carbon atoms and fluoroalkoxy with 1-6 carbon atoms.
2. The overcharge-resistant electrolyte of claim 1, wherein the lithium salt is present in an amount of 2 to 20% by weight of the electrolyte.
3. The overcharge protection electrolyte of claim 1 wherein the lithium salt is one or a combination of lithium hexafluorophosphate, lithium bis (oxalato) borate, lithium difluorophosphate, lithium difluoro (oxalato) borate, lithium bis (fluorosulfonyl) imide, lithium bis (trifluoromethylsulfonyl) imide, lithium trifluoromethanesulfonate, lithium tetrafluoroborate, lithium perchlorate, lithium (fluorosulfonyl) trifluoromethylsulfonyl imide, lithium tetrachloroaluminate, lithium hexafluoroarsenate.
4. The overcharge-resistant electrolyte of claim 1, wherein the overcharge-resistant additive comprises 0.01 to 20 weight percent of the electrolyte.
5. The overcharge-resistant electrolyte of claim 1, wherein the nonaqueous organic solvent is in a percentage of 70 to 90 percent by weight of the electrolyte.
6. The overfill prevention electrolyte of claim 1, wherein the non-aqueous organic solvent is one or a combination of more of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, ethylene carbonate, fluoroethylene carbonate, methyl formate, ethyl formate, propyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, γ -butyrolactone, dioxolane, tetrahydrofuran, dimethyl trifluoroacetamide, and dimethyl sulfoxide.
7. The overcharge-resistant electrolyte of claim 1, wherein the additive further comprises other additives, and the other additives are present in an amount of 0.1 to 10% by weight of the electrolyte.
8. The overcharge-resistant electrolyte of claim 7, wherein the other additive is one or more of vinylene carbonate, ethylene carbonate, fluoroethylene carbonate, 1, 3-propane sultone, 1, 4-butane sultone, vinyl sulfate, vinyl sulfite, propylene sulfate, propylene sulfite, butylene sulfate, and lithium difluorophosphate.
9. A lithium battery is characterized by comprising a positive plate, a negative plate, electrolyte and a diaphragm, wherein the diaphragm is arranged between the positive plate and the negative plate; the electrolyte is the overcharge-preventing electrolyte described in any one of claims 1 to 9.
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| CN117855608A (en) * | 2024-03-07 | 2024-04-09 | 宁德新能源科技有限公司 | Electrolyte, secondary battery, and electronic device |
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| CN114759260A (en) * | 2022-05-17 | 2022-07-15 | 傲普(上海)新能源有限公司 | Electrolyte for improving high-temperature performance of battery and lithium ion battery |
| CN114759260B (en) * | 2022-05-17 | 2023-10-10 | 傲普(上海)新能源有限公司 | Electrolyte for improving high-temperature performance of battery and lithium ion battery |
| CN117855608A (en) * | 2024-03-07 | 2024-04-09 | 宁德新能源科技有限公司 | Electrolyte, secondary battery, and electronic device |
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