CN116565319A - Additive for high-voltage lithium cobaltate battery electrolyte - Google Patents
Additive for high-voltage lithium cobaltate battery electrolyte Download PDFInfo
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- CN116565319A CN116565319A CN202310680386.4A CN202310680386A CN116565319A CN 116565319 A CN116565319 A CN 116565319A CN 202310680386 A CN202310680386 A CN 202310680386A CN 116565319 A CN116565319 A CN 116565319A
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- lithium
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- carbonate
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 140
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 53
- 239000000654 additive Substances 0.000 title claims abstract description 41
- 230000000996 additive effect Effects 0.000 title claims abstract description 30
- -1 difluoromethyl oxalic acid phosphate Chemical compound 0.000 claims abstract description 67
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 claims abstract description 27
- UFFSXJKVKBQEHC-UHFFFAOYSA-N heptafluorobutyric anhydride Chemical compound FC(F)(F)C(F)(F)C(F)(F)C(=O)OC(=O)C(F)(F)C(F)(F)C(F)(F)F UFFSXJKVKBQEHC-UHFFFAOYSA-N 0.000 claims abstract description 26
- PMKRSEXTSAANMF-UHFFFAOYSA-N [bis(ethenyl)-trimethylsilyloxysilyl] tris(trimethylsilyl) silicate Chemical compound C[Si](C)(C)O[Si](O[Si](C)(C)C)(O[Si](C)(C)C)O[Si](O[Si](C)(C)C)(C=C)C=C PMKRSEXTSAANMF-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000126 substance Substances 0.000 claims abstract description 4
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 42
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 40
- 239000003960 organic solvent Substances 0.000 claims description 29
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 28
- BTGRAWJCKBQKAO-UHFFFAOYSA-N adiponitrile Chemical compound N#CCCCCC#N BTGRAWJCKBQKAO-UHFFFAOYSA-N 0.000 claims description 22
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 claims description 20
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 claims description 20
- CTSLXHKWHWQRSH-UHFFFAOYSA-N oxalyl chloride Chemical compound ClC(=O)C(Cl)=O CTSLXHKWHWQRSH-UHFFFAOYSA-N 0.000 claims description 10
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 9
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 9
- 229910003002 lithium salt Inorganic materials 0.000 claims description 9
- 159000000002 lithium salts Chemical class 0.000 claims description 9
- VEWLDLAARDMXSB-UHFFFAOYSA-N ethenyl sulfate;hydron Chemical compound OS(=O)(=O)OC=C VEWLDLAARDMXSB-UHFFFAOYSA-N 0.000 claims description 8
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims description 6
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-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
- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- PSSYTNOBLFNLCP-UHFFFAOYSA-N difluoromethyl dihydrogen phosphate Chemical compound OP(O)(=O)OC(F)F PSSYTNOBLFNLCP-UHFFFAOYSA-N 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- HNAGHMKIPMKKBB-UHFFFAOYSA-N 1-benzylpyrrolidine-3-carboxamide Chemical compound C1C(C(=O)N)CCN1CC1=CC=CC=C1 HNAGHMKIPMKKBB-UHFFFAOYSA-N 0.000 claims description 3
- HFZLSTDPRQSZCQ-UHFFFAOYSA-N 1-pyrrolidin-3-ylpyrrolidine Chemical compound C1CCCN1C1CNCC1 HFZLSTDPRQSZCQ-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
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 claims description 3
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-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
- OBNCKNCVKJNDBV-UHFFFAOYSA-N butanoic acid ethyl ester Natural products CCCC(=O)OCC OBNCKNCVKJNDBV-UHFFFAOYSA-N 0.000 claims description 3
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 238000001914 filtration Methods 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
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 claims description 3
- 229940017219 methyl propionate Drugs 0.000 claims description 3
- KKQAVHGECIBFRQ-UHFFFAOYSA-N methyl propyl carbonate Chemical compound CCCOC(=O)OC KKQAVHGECIBFRQ-UHFFFAOYSA-N 0.000 claims description 3
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 2
- 230000003993 interaction Effects 0.000 abstract description 3
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical class FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 description 37
- 230000000052 comparative effect Effects 0.000 description 19
- 238000004090 dissolution Methods 0.000 description 14
- YPGMOWHXEQDBBV-IMJSIDKUSA-N (4R,5R)-1,2-dithiane-4,5-diol Chemical compound O[C@H]1CSSC[C@@H]1O YPGMOWHXEQDBBV-IMJSIDKUSA-N 0.000 description 13
- 239000007774 positive electrode material Substances 0.000 description 13
- 239000012300 argon atmosphere Substances 0.000 description 11
- 230000007613 environmental effect Effects 0.000 description 11
- 238000002156 mixing Methods 0.000 description 11
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical group C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000007784 solid electrolyte Substances 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical compound [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 4
- 239000011888 foil Substances 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 238000006864 oxidative decomposition reaction Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000007772 electrode material Substances 0.000 description 3
- 229910052816 inorganic phosphate Inorganic materials 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 125000004469 siloxy group Chemical group [SiH3]O* 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910001428 transition metal ion Inorganic materials 0.000 description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910021383 artificial graphite Inorganic materials 0.000 description 2
- 239000002041 carbon nanotube Substances 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 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
- 230000008569 process Effects 0.000 description 2
- ZPFAVCIQZKRBGF-UHFFFAOYSA-N 1,3,2-dioxathiolane 2,2-dioxide Chemical compound O=S1(=O)OCCO1 ZPFAVCIQZKRBGF-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910012820 LiCoO Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- FNNQVYCCWJJBHH-UHFFFAOYSA-N difluoro methyl phosphate Chemical compound COP(=O)(OF)OF FNNQVYCCWJJBHH-UHFFFAOYSA-N 0.000 description 1
- 125000001028 difluoromethyl group Chemical group [H]C(F)(F)* 0.000 description 1
- NTQGILPNLZZOJH-UHFFFAOYSA-N disilicon Chemical compound [Si]#[Si] NTQGILPNLZZOJH-UHFFFAOYSA-N 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000006259 organic additive Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002153 silicon-carbon composite material Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 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
-
- 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
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- 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 discloses an additive for high-voltage lithium cobaltate battery electrolyte, which comprises (by mass) vinylene carbonate, difluoromethyl oxalic acid phosphate, heptafluorobutyric anhydride and divinyl tetra (trimethylsiloxy) disiloxane, wherein the ratio of (0.05-0.3 part) to (0.5-5 part) to (0.1-2 part) of the vinylene carbonate, the difluoromethyl oxalic acid phosphate, the heptafluorobutyric anhydride and the divinyl tetra (trimethylsiloxy) disiloxane is calculated. The invention realizes the excellent electrical performance of the electrolyte under high voltage through the interaction of the four substances in the additive.
Description
The application is a divisional application with the application number of 2021116740237 and the invention name of electrolyte for a high-voltage lithium cobalt oxide battery and the lithium cobalt oxide battery.
Technical Field
The invention relates to the technical field of materials, in particular to an additive for high-voltage lithium cobalt oxide battery electrolyte.
Background
With the progress of technology, demands of consumer electronics and electric vehicles are increasing. Lithium ion batteries of the lithium cobaltate system have so far taken up a large share of the consumer electronics market, owing to their excellent cycle stability, higher volumetric energy density and cycle life. Today's intelligent consumer electronics products need lithium batteries with high energy density to extend the working time and service life of the products, and in order to meet the needs of the public, lithium ion batteries with higher energy density and power density must be developed to realize long-term endurance and energy storage. The charging cut-off voltage of the current commercial lithium cobaltate battery is mostly 4.4V, the specific capacity is 160mAh/g, and the current commercial lithium cobaltate battery is a certain distance away from the theoretical specific capacity of 275mAh/g, so that the lithium cobaltate battery has great development potential, and the practical economic significance of improving the battery performance of the lithium cobaltate battery is realized.
The development of the lithium battery with high energy density can lead the anode material and the cathode material to exert higher specific capacity by means of improving the working voltage of the battery, thereby improving the mass energy density and the volume energy density of the lithium ion battery, reducing the cost of the lithium battery and becoming a hot spot for people to study in recent years.
However, in the process of researching a high-voltage lithium battery, it is found that along with the increase of the working voltage of the lithium ion battery, the traditional lithium battery electrolyte not only can be subjected to self oxidative decomposition, but also can be subjected to irreversible chemical reaction with a positive electrode material, and active lithium is continuously consumed, so that the battery impedance is increased, the capacity retention rate is low, the performance is deteriorated, and the service life of the battery is seriously shortened, so that the development of a matched electrolyte technology for the high-voltage lithium battery is critical.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides an electrolyte for a high-voltage lithium cobalt oxide battery and the lithium cobalt oxide battery.
In a first aspect, an embodiment of the present invention provides an electrolyte for a high-voltage lithium cobalt oxide battery, including: a lithium salt electrolyte, an organic solvent and an additive;
the additive comprises: vinylene carbonate, difluoromethyl oxalate phosphate, heptafluorobutyric anhydride, divinyl tetra (trimethylsiloxy) disiloxane.
Preferably, the lithium salt electrolyte includes: one or more of lithium hexafluorophosphate, lithium hexafluoroarsenate, lithium perchlorate, lithium tetrafluoroborate, lithium bisoxalato borate, lithium difluorooxalato borate or lithium bis (trifluoromethylsulfonyl imide);
the mass of the lithium salt electrolyte accounts for 10% -20% of the total mass of the electrolyte.
Preferably, the organic solvent includes: any one or a mixture of several of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, methyl propyl carbonate, 1, 4-butyrolactone, methyl formate, ethyl acetate, methyl propionate, ethyl propionate, propyl propionate, butyl propionate, ethyl butyrate and halogenated derivatives thereof;
the mass of the organic solvent accounts for 70-85% of the total mass of the electrolyte.
Further preferably, the organic solvent is a mixture of the ethylene carbonate, the propylene carbonate, the halogenated derivative of ethylene carbonate, fluoroethylene carbonate and ethylmethyl carbonate;
wherein the mass of the ethylene carbonate accounts for 5-15% of the total mass of the organic solvent, the mass of the propylene carbonate accounts for 5-15% of the total mass of the organic solvent, the mass of the fluoroethylene carbonate accounts for 3-10% of the total mass of the organic solvent, and the mass of the methyl ethyl carbonate accounts for 60-80% of the total mass of the organic solvent.
Preferably, the mass of the additive accounts for 0.75% -10% of the total mass of the electrolyte; wherein the mass of the vinylene carbonate accounts for 0.05-0.3% of the total mass of the electrolyte, the mass of the difluoromethyl oxalic acid phosphate accounts for 0.5-5% of the total mass of the electrolyte, the heptafluoro butyric anhydride accounts for 0.1-2% of the total mass of the electrolyte, and the divinyl tetra (trimethylsiloxy) disiloxane accounts for 0.1-2% of the total mass of the electrolyte.
Preferably, the additive further comprises: vinyl sulfate and/or adiponitrile;
wherein the mass of the vinyl sulfate accounts for 0.1% -1% of the total mass of the electrolyte; the mass of the adiponitrile accounts for 0.1% -1% of the total mass of the electrolyte.
Preferably, the high-voltage lithium cobaltate battery is a lithium cobaltate battery with an operating voltage of 4.4V or more.
In a second aspect, embodiments of the present invention provide an additive for use in the electrolyte of the first aspect described above; the additive comprises: vinylene carbonate, difluoromethyl phosphate oxalate, heptafluorobutyric anhydride, divinyl tetra (trimethylsiloxy) disiloxane; wherein the structural formula of the difluoromethyl oxalic acid phosphate is as follows:
the difluoro methyl oxalic acid phosphate is obtained by adding dichloromethane, difluoro methyl phosphoric acid and pyridine into a dry three-neck round bottom flask in sequence, fully stirring and dripping oxalyl chloride under ice bath condition, fully reacting, filtering, adding water for extraction, and finally distilling the solvent under reduced pressure, and collecting fractions.
In a third aspect, an embodiment of the present invention provides a high-voltage lithium cobalt oxide battery, where the high-voltage lithium cobalt oxide battery includes the electrolyte for a high-voltage lithium cobalt oxide battery according to the first aspect.
Preferably, the high-voltage lithium cobaltate battery has a charge cut-off voltage of 4.4V or more.
According to the electrolyte for the high-voltage lithium cobaltate battery, provided by the embodiment of the invention, the additive vinylene carbonate only participates in the formation of a negative electrode Solid Electrolyte Interface (SEI) film in the first formation, and forms stable SEI, and is consumed after the SEI film is formed, so that negative influence of the SEI film on a positive electrode due to instability of high voltage is prevented; the method comprises the steps of oxidizing and decomposing difluoromethyl oxalic acid phosphate and heptafluorobutyric anhydride under high voltage to form a positive electrode-electrolyte interface phase (CEI) film containing LiF and inorganic phosphate on the surface of a positive electrode material, wherein the CEI film is uniform and compact and completely covers lithium cobaltate particles, so that the surface of the positive electrode material is prevented from being in direct contact with electrolyte, dissolution of transition metal ions with high oxidability in the positive electrode material is inhibited, the continuous oxidative decomposition of the electrolyte is reduced, and the stability of a battery system is ensured; the divinyl tetra (trimethyl siloxy) disiloxane has the advantages that under the action of the polymethyl, the bond energy of the siloxy bond can be changed, so that the divinyl tetra (trimethyl siloxy) disiloxane is easy to react with HF in the electrolyte, the content of HF in the electrolyte is reduced, the attack of HF on the surface of an electrode material and a solid electrolyte membrane is avoided, and the stability of the electrode surface and the electrolyte components is further protected. The electrolyte realizes excellent electrical performance under high voltage through interaction of the four substances in the additive.
Detailed Description
The invention is further illustrated by the following specific examples, which are to be understood as being for the purpose of more detailed description only and are not to be construed as limiting the invention in any way, i.e. not intended to limit the scope of the invention.
The embodiment of the invention provides an electrolyte for a high-voltage lithium cobalt oxide battery, which comprises the following components: lithium salt electrolyte, organic solvent and additive.
The lithium salt electrolyte includes: one or more of lithium hexafluorophosphate, lithium hexafluoroarsenate, lithium perchlorate, lithium tetrafluoroborate, lithium bisoxalato borate, lithium difluorooxalato borate or lithium bis (trifluoromethylsulfonyl imide); the mass of the lithium salt electrolyte accounts for 10-20% of the total mass of the electrolyte.
The organic solvents include: any one or a mixture of several of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, methyl propyl carbonate, 1, 4-butyrolactone, methyl formate, ethyl acetate, methyl propionate, ethyl propionate, propyl propionate, butyl propionate, ethyl butyrate and halogenated derivatives thereof; the mass of the organic solvent accounts for 70-85% of the total mass of the electrolyte.
The organic solvent is preferably a mixture of ethylene carbonate, propylene carbonate, fluoroethylene carbonate and ethylmethyl carbonate; wherein the mass of the ethylene carbonate occupies 5 to 15 percent of the total mass of the organic solvent, the mass of the propylene carbonate occupies 5 to 15 percent of the total mass of the organic solvent, the mass of the fluoroethylene carbonate occupies 3 to 10 percent of the total mass of the organic solvent, and the mass of the methyl ethyl carbonate occupies 60 to 80 percent of the total mass of the organic solvent.
The additive comprises: vinylene Carbonate (VC), difluoromethyl phosphate oxalate, heptafluorobutyric anhydride, divinyl tetra (trimethylsiloxy) disiloxane; the mass of the additive accounts for 0.75-10% of the total mass of the electrolyte; wherein, the mass of vinylene carbonate accounts for 0.05% -0.3% of the total mass of the electrolyte, the mass of difluoromethyl oxalic acid phosphate accounts for 0.5% -5% of the total mass of the electrolyte, heptafluorobutyric anhydride accounts for 0.1% -2% of the total mass of the electrolyte, and divinyl tetra (trimethylsiloxy) disiloxane accounts for 0.1% -2% of the total mass of the electrolyte.
Wherein the difluoromethyl oxalate phosphate is prepared from difluoromethyl phosphate (F 2 PO (OH) 2, CAS code 74963-39-6) and oxalyl chloride ((COCl) 2 ) And synthesizing to obtain the product.
Wherein difluoromethyl phosphoric acid (F) 2 PO(OH) 2 ) The structural formula is as follows:
oxalyl chloride ((COC l) 2 ) The structural formula is as follows:
the synthesis process is as follows: the dry water-free CaCl is arranged on a dry water-free pipe orifice (a thermometer, a dropping funnel and a reflux condenser are arranged on the water-free pipe orifice) 2 Drying tube) and a 250ml three-necked round bottom flask of a water knockout vessel, are sequentially added with quantitative dichloromethane, difluoromethylphosphoric acid, pyridine, and stirred slowly under ice bath conditionAfter oxalyl chloride is dripped, filtering is carried out after full reaction, water is added for extraction, and finally, the solvent is distilled under reduced pressure, and fractions are collected, thus obtaining the difluoromethyl phosphooxalate.
The chemical reaction equation is: f (F) 2 PO(OH) 2 +(COCl) 2 →F 2 PO(OCO) 2 +2HCl↑。
The structural formula of the difluoromethyl oxalic acid phosphate is as follows:
the structural formula of the divinyl tetra (trimethylsiloxy) disiloxane is as follows:
the additive vinylene carbonate only participates in the formation of a negative electrode Solid Electrolyte Interface (SEI) film in the first formation, forms stable SEI, is consumed after the SEI film is formed, and prevents negative effects of the SEI film caused by instability of high voltage at a positive electrode; the difluoro methyl oxalic acid phosphate and the heptafluoro butyric anhydride are oxidized and decomposed under high voltage, a composite CEI film containing LiF and inorganic phosphate is formed on the surface of the positive electrode material, the CEI film is uniform and compact, lithium cobaltate particles are completely coated, the surface of the positive electrode material is prevented from being in direct contact with electrolyte, the dissolution of transition metal ions with high oxidability in the positive electrode material is inhibited, the continuous oxidative decomposition of the electrolyte is reduced, and the stability of a battery system is ensured; the divinyl tetra (trimethyl siloxy) disiloxane is easy to react with HF in the electrolyte due to the change of bond energy of a siloxy bond under the action of the polymethyl, so that the content of HF in the electrolyte is reduced, the attack of HF on the surface of an electrode material and a solid electrolyte membrane is avoided, and the stability of the electrode surface and the electrolyte components is further protected. By the interaction of these four substances in the additive, excellent electrical properties of the electrolyte at high voltages are achieved.
In a preferred embodiment, the additive further comprises: vinyl sulfate (DTD), adiponitrile (ADN); wherein, the mass of the vinyl sulfate accounts for 0.1 to 1 percent of the total mass of the electrolyte; the mass of adiponitrile accounts for 0.1% -1% of the total mass of the electrolyte. They can be used as auxiliary additives in the system, and can form film on the surfaces of positive and negative electrodes to protect the positive and negative electrodes.
The electrolyte for the high-voltage lithium cobalt oxide battery provided by the embodiment of the invention can be used in the high-voltage lithium cobalt oxide battery, the positive electrode material is lithium cobalt oxide, and the negative electrode is artificial graphite or a silicon-carbon composite negative electrode. The lithium cobaltate battery adopting the electrolyte can reach a charge cut-off voltage of 4.4V or above.
Because the capacity of the lithium cobaltate gram under high voltage is higher, the working voltage and the energy density of the lithium cobaltate battery are effectively improved by adopting the electrolyte for the high-voltage lithium cobaltate battery; and under the condition of the same energy density, the consumption of lithium cobaltate material can be reduced, and the cost of the battery is reduced.
In order to better understand the technical scheme provided by the invention, the specific implementation of the electrolyte and the method and the battery characteristics applied to the high-voltage lithium cobaltate battery are respectively described in the following specific examples.
Example 1
The embodiment provides an electrolyte for a high-voltage lithium cobaltate battery, which is prepared by the following steps:
in argon atmosphere, the environmental index is H 2 O≤0.5ppm，O 2 In a glove box with the mass ratio of less than or equal to 2.0ppm, mixing organic solvents of Ethylene Carbonate (EC), propylene Carbonate (PC), fluoroethylene carbonate (FEC) and methyl ethyl carbonate (EMC) according to the mass ratio of EC/PC/FEC/EMC=15/10/5/70, adding lithium hexafluorophosphate for dissolution to prepare electrolyte with the concentration of 1mol/L of lithium hexafluorophosphate, and adding additives of ethylene carbonate (VC), ethylene sulfate (DTD), adiponitrile (ADN), difluoromethyl phosphate oxalate, heptafluorobutyric anhydride and divinyl tetra (trimethylsiloxy) disiloxane into electrolyte base solutions according to mass fractions of 0.2%, 0.3%, 1% and 1% respectively to obtain the electrolyte.
The electrolyte prepared in this example is numbered 1#.
Example 2
The embodiment provides an electrolyte for a high-voltage lithium cobaltate battery, which is prepared by the following steps:
in argon atmosphere, the environmental index is H 2 O≤0.5ppm，O 2 In a glove box with the concentration of less than or equal to 2.0ppm, mixing organic solvents of Ethylene Carbonate (EC), propylene Carbonate (PC), fluoroethylene carbonate (FEC) and methyl ethyl carbonate (EMC) according to the mass ratio of EC/PC/FEC/EMC=10/15/5/70, then adding lithium hexafluorophosphate for dissolution to prepare electrolyte with the concentration of 1mol/L of lithium hexafluorophosphate, and then adding additives VC, DTD, ADN, difluoro methyl oxalic acid phosphate, heptafluoro butyric anhydride and divinyl tetra (trimethylsiloxy) disiloxane into electrolyte base solutions according to mass fractions of 0.2%, 0.3%, 1% and 1% respectively to obtain the electrolyte.
The electrolyte prepared in this example is numbered 2#.
Example 3
The embodiment provides an electrolyte for a high-voltage lithium cobaltate battery, which is prepared by the following steps:
in argon atmosphere, the environmental index is H 2 O≤0.5ppm，O 2 In a glove box with the concentration of less than or equal to 2.0ppm, mixing organic solvents of Ethylene Carbonate (EC), propylene Carbonate (PC), fluoroethylene carbonate (FEC) and methyl ethyl carbonate (EMC) according to the mass ratio of EC/PC/FEC/EMC=15/10/5/70, then adding lithium hexafluorophosphate for dissolution to prepare electrolyte with the concentration of 1mol/L of lithium hexafluorophosphate, and then adding additives VC, DTD, ADN, difluoro methyl oxalic acid phosphate, heptafluoro butyric anhydride and divinyl tetra (trimethylsiloxy) disiloxane into electrolyte base solutions according to mass fractions of 0.2%, 0.3%, 2%, 1% and 1% respectively to obtain the electrolyte.
The electrolyte prepared in this example was numbered 3#.
Example 4
The embodiment provides an electrolyte for a high-voltage lithium cobaltate battery, which is prepared by the following steps:
in argon atmosphere, the environmental index is H 2 O≤0.5ppm，O 2 In a glove box with the concentration of less than or equal to 2.0ppm, mixing organic solvents of Ethylene Carbonate (EC), propylene Carbonate (PC), fluoroethylene carbonate (FEC) and methyl ethyl carbonate (EMC) according to the mass ratio of EC/PC/FEC/EMC=15/10/5/70, then adding lithium hexafluorophosphate for dissolution to prepare electrolyte with the concentration of 1mol/L of lithium hexafluorophosphate, and then adding additives VC, DTD, ADN, difluoro methyl oxalic acid phosphate, heptafluoro butyric anhydride and divinyl tetra (trimethylsiloxy) disiloxane into electrolyte base solutions according to mass fractions of 0.2%, 0.3%, 3%, 1% and 1% respectively to obtain the electrolyte.
The electrolyte prepared in this example is numbered 4#.
Example 5
The embodiment provides an electrolyte for a high-voltage lithium cobaltate battery, which is prepared by the following steps:
in argon atmosphere, the environmental index is H 2 O≤0.5ppm，O 2 In a glove box with the concentration of less than or equal to 2.0ppm, mixing organic solvents of Ethylene Carbonate (EC), propylene Carbonate (PC), fluoroethylene carbonate (FEC) and methyl ethyl carbonate (EMC) according to the mass ratio of EC/PC/FEC/EMC=15/10/5/70, then adding lithium hexafluorophosphate for dissolution to prepare electrolyte with the concentration of 1mol/L of lithium hexafluorophosphate, and then adding additives VC, DTD, ADN, difluoro methyl oxalic acid phosphate, heptafluoro butyric anhydride and divinyl tetra (trimethylsiloxy) disiloxane into electrolyte base solutions according to mass fractions of 0.2%, 0.3%, 1%, 2% and 1%, respectively, so as to obtain the electrolyte.
The electrolyte prepared in this example was numbered 5#.
Example 6
The embodiment provides an electrolyte for a high-voltage lithium cobaltate battery, which is prepared by the following steps:
in argon atmosphere, the environmental index is H 2 O≤0.5ppm，O 2 Mixing organic solvents of Ethylene Carbonate (EC), propylene Carbonate (PC), fluoroethylene carbonate (FEC) and methyl ethyl carbonate (EMC) in a glove box of less than or equal to 2.0ppm according to the mass ratio of EC/PC/FEC/EMC=15/10/5/70, and then adding lithium hexafluorophosphate for dissolution to prepare hexafluorophosphateThe electrolyte with the lithium acid concentration of 1mol/L is added with additive VC, DTD, ADN, difluoromethyl oxalic acid phosphate, heptafluorobutyric anhydride and divinyl tetra (trimethylsiloxy) disiloxane according to the mass fractions of 0.2%, 0.3%, 1%, 1.5% respectively to obtain the electrolyte.
The electrolyte prepared in this example is numbered 6#.
Example 7
The embodiment provides an electrolyte for a high-voltage lithium cobaltate battery, which is prepared by the following steps:
in argon atmosphere, the environmental index is H 2 O≤0.5ppm，O 2 In a glove box with the concentration of less than or equal to 2.0ppm, mixing organic solvents of Ethylene Carbonate (EC), propylene Carbonate (PC), fluoroethylene carbonate (FEC) and methyl ethyl carbonate (EMC) according to the mass ratio of EC/PC/FEC/EMC=15/10/5/70, then adding lithium hexafluorophosphate for dissolution to prepare electrolyte with the concentration of 1mol/L of lithium hexafluorophosphate, and then adding additives VC, DTD, ADN, difluoro methyl oxalic acid phosphate, heptafluoro butyric anhydride and divinyl tetra (trimethyl silica) disiloxane into the electrolyte base solution according to the mass fractions of 0.2%, 0.3%, 2%, 0.5% and 1% respectively to obtain the electrolyte.
The electrolyte prepared in this example was numbered 7#.
Example 8
The embodiment provides an electrolyte for a high-voltage lithium cobaltate battery, which is prepared by the following steps:
in argon atmosphere, the environmental index is H 2 O≤0.5ppm，O 2 In a glove box with the concentration of less than or equal to 2.0ppm, mixing organic solvents of Ethylene Carbonate (EC), propylene Carbonate (PC), fluoroethylene carbonate (FEC) and methyl ethyl carbonate (EMC) according to the mass ratio of EC/PC/FEC/EMC=15/10/5/70, adding lithium hexafluorophosphate for dissolution to prepare electrolyte with the concentration of 1mol/L lithium hexafluorophosphate, and adding additives of VC, DTD, ADN, difluoromethyl oxalic acid phosphate, heptafluorobutyric anhydride and divinyl tetra (trimethylsiloxy) disilicon into the electrolyte base solution according to the mass fractions of 0.2%, 0.3%, 2%, 0.5% and 2% respectivelyAnd (3) an oxyalkane to obtain an electrolyte.
The electrolyte prepared in this example was numbered 8#.
To better illustrate the effect of the examples of the present invention, comparative example 1, comparative example 2 and comparative example 3 are compared with the above examples.
Comparative example 1
The comparative example provides an electrolyte, which is prepared by the following steps:
in argon atmosphere, the environmental index is H 2 O≤0.5ppm，O 2 In a glove box with the concentration of less than or equal to 2.0ppm, mixing organic solvents of Ethylene Carbonate (EC), propylene Carbonate (PC), fluoroethylene carbonate (FEC) and methyl ethyl carbonate (EMC) according to the mass ratio of EC/PC/FEC/EMC=15/10/5/70, then adding lithium hexafluorophosphate for dissolution to prepare electrolyte with the concentration of 1mol/L lithium hexafluorophosphate, and then adding additives DTD and ADN into electrolyte base solution according to the mass fractions of 0.3% and 0.3% respectively to obtain the electrolyte.
The electrolyte prepared in this comparative example is numbered 9#.
Comparative example 2
The comparative example provides an electrolyte, which is prepared by the following steps:
in argon atmosphere, the environmental index is H 2 O≤0.5ppm，O 2 In a glove box with the concentration of less than or equal to 2.0ppm, mixing organic solvents of Ethylene Carbonate (EC), propylene Carbonate (PC), fluoroethylene carbonate (FEC) and methyl ethyl carbonate (EMC) according to the mass ratio of EC/PC/FEC/EMC=15/10/5/70, then adding lithium hexafluorophosphate for dissolution to prepare electrolyte with the concentration of 1mol/L lithium hexafluorophosphate, and then adding additives VC, DTD, ADN and difluoromethyl phosphate oxalate into electrolyte base solution according to mass fractions of 0.2%, 0.3% and 1%, respectively, so as to obtain the electrolyte.
The electrolyte prepared in this comparative example is numbered 10#.
Comparative example 3
The comparative example provides an electrolyte, which is prepared by the following steps:
in argon atmosphere, the environmental index is H 2 O≤0.5ppm，O 2 In a glove box of less than or equal to 2.0ppmOrganic solvents of Ethylene Carbonate (EC), propylene Carbonate (PC), fluoroethylene carbonate (FEC) and methyl ethyl carbonate (EMC) are mixed according to mass ratio of EC/PC/FEC/EMC=15/10/5/70, then lithium hexafluorophosphate is added for dissolution, electrolyte with the concentration of 1mol/L lithium hexafluorophosphate is prepared, and then additive VC, DTD, ADN and divinyl tetra (trimethylsiloxy) disiloxane are respectively added into electrolyte base solution according to mass fractions of 0.2%, 0.3% and 1%, so that electrolyte is obtained.
The electrolyte prepared in this comparative example is numbered 11#.
For the electrolytes obtained in the above examples and comparative examples, the assembly and testing of the battery were performed in the following manner.
Preparation of lithium cobaltate battery:
selecting lithium cobalt oxide suitable for high voltage as a positive electrode material, and adding LiCoO as the positive electrode material 2 Uniformly mixing carbon nano tube CNTs and polyvinylidene fluoride PVDF according to the ratio of 98:1:1, coating on an aluminum foil current collector, drying the aluminum foil current collector by an oven, rolling the aluminum foil current collector on a roll squeezer, and compacting the aluminum foil current collector to a compaction density of 4.0g/cm 3 The required positive plate is obtained.
Artificial graphite is selected as a negative electrode material, and an artificial negative electrode, carboxymethyl cellulose CMC, a conductive agent Super P and a binder Styrene Butadiene Rubber (SBR) are mixed according to the following ratio of 95:1.2:1.8:2, and the mixture is uniformly mixed to prepare the negative plate, wherein the compacted density of the plate is 1.65g/cm 3 。
PE with the thickness of 9 mu m is selected as a base film, a ceramic material with the thickness of 3 mu m is coated, a (9+3) coating isolation film is obtained, and a pole piece is manufactured into a small soft package battery with the thickness of 2Ah through a lamination method, wherein the electrolyte is respectively the electrolyte in the embodiment and the comparative example.
Lithium battery performance test:
the charge-discharge voltage window of the lithium battery is set to 3.0-4.5V, the circulating charge-discharge current is set to 1A (0.5C), and the circulating test temperature is 25 ℃.
Test results and discussion:
table 1 shows the results of electrical performance tests of small pouch cells using the electrolytes of examples 1 to 8 and comparative examples 1 to 3.
TABLE 1
As can be seen from the data in table 1, the 200-week capacity retention was significantly improved for the cells prepared using the electrolytes of examples 1-8 of the present invention, compared to the conventional cells prepared using electrolyte 9# of comparative example 1 using DTD and ADN additives.
It can be seen that the batteries prepared with the electrolytes of examples 1 to 8 of the present invention have a better capacity retention rate at 200 weeks in circulation than the battery prepared with electrolyte 10# of comparative example 2, which does not contain difluoromethyl oxalate or heptafluorobutyric anhydride. The method is characterized in that difluoro methyl oxalic acid phosphate and heptafluoro butyric anhydride are oxidized and decomposed at high voltage to form a composite CEI film containing LiF and inorganic phosphate on the surface of the positive electrode material, the CEI film is uniform and compact, lithium cobaltate particles are completely coated, direct contact between the surface of the positive electrode material and electrolyte is avoided, dissolution of transition metal ions with high oxidability in the positive electrode material is inhibited, continuous oxidative decomposition of the electrolyte is reduced, and stability of a battery system is ensured.
It can be seen that the batteries prepared with the electrolytes of examples 1 to 8 of the present invention have a better capacity retention rate at 200 weeks in circulation than the battery prepared with electrolyte 11# of comparative example 3, which does not contain divinyl tetra (trimethylsiloxy) disiloxane. This is because the divinyl tetra (trimethylsiloxy) disiloxane is susceptible to react with HF in the electrolyte due to the change in bond energy of the siloxane bond under the action of the polymethyl group, thereby reducing the content of HF in the electrolyte, avoiding the attack of HF on the electrode material surface and the solid electrolyte membrane, and further protecting the electrode surface and the stability of electrolyte components.
Compared with comparative examples 1-3, the cycle life of the lithium cobaltate battery under the high-voltage condition of 4.5V is improved to a certain extent after the high-voltage electrolyte is used. The high-voltage electrolyte provided by the invention has good performance under the condition of a 4.5V lithium cobalt oxide battery, and has more advantages compared with the existing lithium cobalt oxide battery with the charge cut-off voltage of most 4.4V.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. An additive for a high-voltage lithium cobaltate battery electrolyte is characterized in that the additive comprises vinylene carbonate, difluoromethyl oxalic acid phosphate, heptafluorobutyric anhydride and divinyl tetra (trimethylsiloxy) disiloxane, and the ratio of the vinylene carbonate to the difluoromethyl oxalic acid phosphate to the heptafluorobutyric anhydride to the divinyl tetra (trimethylsiloxy) disiloxane is (0.05-0.3 part) to (0.5-5 part) to (0.1-2 part) by mass.
2. The additive for high-voltage lithium cobaltate battery electrolyte according to claim 1, wherein the additive comprises vinylene carbonate, difluoromethyl oxalic acid phosphate, heptafluorobutyric anhydride and divinyl tetra (trimethylsiloxy) disiloxane, and the ratio of the vinylene carbonate, the difluoromethyl oxalic acid phosphate, the heptafluorobutyric anhydride and the divinyl tetra (trimethylsiloxy) disiloxane is 0.2 parts (1-3 parts) to (0.5-2 parts) to (1-2 parts) by mass.
3. An additive for a high voltage lithium cobalt oxide battery electrolyte according to claim 1, wherein the additive further comprises vinyl sulfate and/or adiponitrile; the ratio of the vinyl sulfate, the adiponitrile, the vinylene carbonate, the difluoromethyl oxalic acid phosphate, the heptafluorobutyric anhydride and the divinyl tetra (trimethylsiloxy) disiloxane is (0.1 part to 1 part), 0.05 part to 0.3 part, 0.5 part to 5 parts, 0.1 part to 2 parts and 0.1 part to 2 parts by mass;
further preferred, the additives include vinylene carbonate, difluoromethyl phosphate oxalate, heptafluorobutyric anhydride, divinyl tetra (trimethylsiloxy) disiloxane, vinyl sulfate and/or adiponitrile; the ratio of the vinyl sulfate, the adiponitrile, the vinylene carbonate, the difluoromethyl oxalic acid phosphate, the heptafluorobutyric anhydride and the divinyl tetra (trimethylsiloxy) disiloxane is 0.3 part by mass and 0.2 part by mass (1 part to 3 parts by mass) and 0.5 part to 2 parts by mass (1 part to 2 parts by mass).
4. The additive for high-voltage lithium cobaltate battery electrolyte according to claim 1, wherein the difluoromethyl oxalate has the structural formula:
the difluoro methyl oxalic acid phosphate is obtained by adding dichloromethane, difluoro methyl phosphoric acid and pyridine into a dry three-neck round bottom flask in sequence, fully stirring and dripping oxalyl chloride under ice bath condition, fully reacting, filtering, adding water for extraction, and finally distilling the solvent under reduced pressure, and collecting fractions.
5. Use of the additive according to any one of claims 1-4 in high voltage lithium cobalt oxide battery electrolytes.
6. The use according to claim 5, wherein the mass of the additive in the electrolyte is 0.75-10% of the total mass of the electrolyte.
7. The use according to claim 5, wherein the electrolyte further comprises a lithium salt electrolyte, an organic solvent.
8. The use according to claim 7, wherein the lithium salt electrolyte comprises: one or more of lithium hexafluorophosphate, lithium hexafluoroarsenate, lithium perchlorate, lithium tetrafluoroborate, lithium bisoxalato borate, lithium difluorooxalato borate or lithium bis (trifluoromethylsulfonyl imide);
the mass of the lithium salt electrolyte accounts for 10% -20% of the total mass of the electrolyte.
9. The use according to claim 7, wherein the organic solvent comprises: ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, ethylmethyl carbonate, methylpropyl carbonate, 1, 4-butyrolactone, methyl formate, ethyl acetate, methyl propionate, ethyl propionate, propyl propionate, butyl propionate, ethyl butyrate, and a mixture of any one or more of halogenated derivatives of these organic substances;
the mass of the organic solvent accounts for 70-85% of the total mass of the electrolyte.
10. The use according to claim 5, wherein the high voltage lithium cobalt oxide battery with the electrolyte is a lithium cobalt oxide battery with an operating voltage of 4.4V and above.
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