CN116487697A - Lithium ion battery electrolyte and application thereof - Google Patents
Lithium ion battery electrolyte and application thereof Download PDFInfo
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- CN116487697A CN116487697A CN202310325334.5A CN202310325334A CN116487697A CN 116487697 A CN116487697 A CN 116487697A CN 202310325334 A CN202310325334 A CN 202310325334A CN 116487697 A CN116487697 A CN 116487697A
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- ion battery
- lithium ion
- additive
- lithium
- battery electrolyte
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 117
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 117
- 239000003792 electrolyte Substances 0.000 title claims abstract description 90
- 239000000654 additive Substances 0.000 claims abstract description 96
- 230000000996 additive effect Effects 0.000 claims abstract description 94
- 239000003960 organic solvent Substances 0.000 claims abstract description 15
- 229910003002 lithium salt Inorganic materials 0.000 claims abstract description 14
- 159000000002 lithium salts Chemical class 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 16
- -1 lithium hexafluorophosphate Chemical compound 0.000 claims description 16
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 claims description 13
- 229910002804 graphite Inorganic materials 0.000 claims description 13
- 239000010439 graphite Substances 0.000 claims description 13
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 12
- 229910052744 lithium Inorganic materials 0.000 claims description 11
- GVNVAWHJIKLAGL-UHFFFAOYSA-N 2-(cyclohexen-1-yl)cyclohexan-1-one Chemical compound O=C1CCCCC1C1=CCCCC1 GVNVAWHJIKLAGL-UHFFFAOYSA-N 0.000 claims description 8
- 101150065749 Churc1 gene Proteins 0.000 claims description 8
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 8
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 8
- 102100038239 Protein Churchill Human genes 0.000 claims description 8
- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 claims description 8
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 8
- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 claims description 7
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 claims description 7
- NEILRVQRJBVMSK-UHFFFAOYSA-N B(O)(O)O.C[SiH](C)C.C[SiH](C)C.C[SiH](C)C Chemical compound B(O)(O)O.C[SiH](C)C.C[SiH](C)C.C[SiH](C)C NEILRVQRJBVMSK-UHFFFAOYSA-N 0.000 claims description 7
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 6
- 229910019142 PO4 Inorganic materials 0.000 claims description 5
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 5
- DEUISMFZZMAAOJ-UHFFFAOYSA-N lithium dihydrogen borate oxalic acid Chemical compound B([O-])(O)O.C(C(=O)O)(=O)O.C(C(=O)O)(=O)O.[Li+] DEUISMFZZMAAOJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000010452 phosphate Substances 0.000 claims description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 5
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 4
- 229910003548 Li(Ni,Co,Mn)O2 Inorganic materials 0.000 claims description 4
- 229910010707 LiFePO 4 Inorganic materials 0.000 claims description 4
- RJUFJBKOKNCXHH-UHFFFAOYSA-N Methyl propionate Chemical compound CCC(=O)OC RJUFJBKOKNCXHH-UHFFFAOYSA-N 0.000 claims description 4
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 4
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 229940017219 methyl propionate Drugs 0.000 claims description 4
- 239000004005 microsphere Substances 0.000 claims description 4
- 239000007774 positive electrode material Substances 0.000 claims description 4
- GWAOOGWHPITOEY-UHFFFAOYSA-N 1,5,2,4-dioxadithiane 2,2,4,4-tetraoxide Chemical compound O=S1(=O)CS(=O)(=O)OCO1 GWAOOGWHPITOEY-UHFFFAOYSA-N 0.000 claims description 3
- 229910006097 Li(Mn, Fe)PO4 Inorganic materials 0.000 claims description 3
- 229910003528 Li(Ni,Co,Al)O2 Inorganic materials 0.000 claims description 3
- 229910015118 LiMO Inorganic materials 0.000 claims description 3
- XNENYPKLNXFICU-UHFFFAOYSA-N P(O)(O)O.C[SiH](C)C.C[SiH](C)C.C[SiH](C)C Chemical compound P(O)(O)O.C[SiH](C)C.C[SiH](C)C.C[SiH](C)C XNENYPKLNXFICU-UHFFFAOYSA-N 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- BTGRAWJCKBQKAO-UHFFFAOYSA-N adiponitrile Chemical compound N#CCCCCC#N BTGRAWJCKBQKAO-UHFFFAOYSA-N 0.000 claims description 3
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 claims description 3
- IGILRSKEFZLPKG-UHFFFAOYSA-M lithium;difluorophosphinate Chemical compound [Li+].[O-]P(F)(F)=O IGILRSKEFZLPKG-UHFFFAOYSA-M 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 239000007773 negative electrode material Substances 0.000 claims description 3
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims 1
- VEWLDLAARDMXSB-UHFFFAOYSA-N ethenyl sulfate;hydron Chemical compound OS(=O)(=O)OC=C VEWLDLAARDMXSB-UHFFFAOYSA-N 0.000 claims 1
- 150000002596 lactones Chemical class 0.000 claims 1
- 125000000524 functional group Chemical group 0.000 abstract description 20
- 238000004519 manufacturing process Methods 0.000 abstract description 18
- 239000006259 organic additive Substances 0.000 abstract description 7
- 229920000642 polymer Polymers 0.000 abstract description 7
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical compound [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 abstract description 3
- 238000006116 polymerization reaction Methods 0.000 abstract description 3
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 208000031509 superficial epidermolytic ichthyosis Diseases 0.000 description 22
- 238000000034 method Methods 0.000 description 20
- 238000012360 testing method Methods 0.000 description 17
- 239000007788 liquid Substances 0.000 description 15
- 239000000203 mixture Substances 0.000 description 15
- 238000009472 formulation Methods 0.000 description 13
- 230000002035 prolonged effect Effects 0.000 description 13
- 239000011248 coating agent Substances 0.000 description 12
- 238000000576 coating method Methods 0.000 description 12
- 238000005520 cutting process Methods 0.000 description 10
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 238000005096 rolling process Methods 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000002033 PVDF binder Substances 0.000 description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 5
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 5
- 230000032683 aging Effects 0.000 description 5
- 239000001768 carboxy methyl cellulose Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 125000004122 cyclic group Chemical group 0.000 description 5
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 5
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 5
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 5
- 229920003048 styrene butadiene rubber Polymers 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 229910021645 metal ion Inorganic materials 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- ZPFAVCIQZKRBGF-UHFFFAOYSA-N 1,3,2-dioxathiolane 2,2-dioxide Chemical compound O=S1(=O)OCCO1 ZPFAVCIQZKRBGF-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 239000010405 anode material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910003473 lithium bis(trifluoromethanesulfonyl)imide Inorganic materials 0.000 description 2
- VDVLPSWVDYJFRW-UHFFFAOYSA-N lithium;bis(fluorosulfonyl)azanide Chemical compound [Li+].FS(=O)(=O)[N-]S(F)(=O)=O VDVLPSWVDYJFRW-UHFFFAOYSA-N 0.000 description 2
- 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 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- 150000003624 transition metals Chemical class 0.000 description 2
- 101100167062 Caenorhabditis elegans chch-3 gene Proteins 0.000 description 1
- 229910015643 LiMn 2 O 4 Inorganic materials 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- WVQUCYVTZWVNLV-UHFFFAOYSA-N boric acid;oxalic acid Chemical compound OB(O)O.OC(=O)C(O)=O WVQUCYVTZWVNLV-UHFFFAOYSA-N 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000006138 lithiation reaction Methods 0.000 description 1
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 1
- 229910001386 lithium phosphate Inorganic materials 0.000 description 1
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000009466 transformation 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
-
- 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
-
- 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
Abstract
The invention relates to a lithium ion battery and electrolyte manufacturing thereof, in particular to a lithium ion battery electrolyte and application thereof. The invention takes additive 1, additive 2, lithium salt and organic solvent as main components to prepare the lithium ion battery electrolyte. The additive 2 is a common lithium ion battery additive, and the additive 1 is a silicon-oxygen cyclic organic additive containing unsaturated functional groups. The additive 1 forms a polymer coated anode through the polymerization reaction of six-membered rings formed by silicon oxygen and functional groups containing unsaturated double bonds and the synergistic effect of the additive 2, and the stability of SEI is improved, so that the purpose of prolonging the cycle life of the lithium ion battery is achieved.
Description
Technical Field
The invention relates to a lithium ion battery and electrolyte manufacturing thereof, in particular to a lithium ion battery electrolyte and application thereof.
Background
The characteristics of high working voltage, high energy density and long cycle life of the lithium ion battery lead the lithium ion battery to be widely applied to the fields of energy storage, passenger cars and the like and become a substitute noun of new energy sources. The ultra-long cycle life is still a focus of interest in the field of lithium ion batteries and their applications.
At present, most of lithium ion battery production uses carbon materials such as artificial graphite, mesophase carbon microspheres and the like as anode materials, and in the first charging process of the lithium ion battery, a layer of solid electrolyte interface (SEI film) is formed on the surface of the anode materials, and the SEI film is formed as a key factor affecting the first charging and discharging efficiency of the lithium ion battery. On one hand, the SEI film has the characteristics of electronic insulation and ion conduction, can prevent electrolyte from contacting with graphite, and is reduced, so that the stability and the cycle life of a negative electrode interface of a lithium ion battery are related, and on the other hand, in the process of charging and discharging lithium ions, the graphite can be periodically expanded and contracted to cause damage and growth of SEI, so that active lithium ions are consumed, and the battery capacity is reduced.
Currently, in order to improve the first charge and discharge efficiency of a battery and the energy density of the battery, the pre-lithiation of a negative electrode and the application thereof are widely studied; aiming at the problem of cyclic capacity attenuation caused by periodic growth of an SEI film, additives such as VC (vinylene carbonate) and the like are widely applied, and the academic believes that after electrons are obtained from VC, unsaturated bonds are opened to generate a high polymer Li-Poly (VC), and the high polymer can reduce the risk of SEI film breakage in the graphite expansion process, thereby being beneficial to improving the SEI stability. Such SEI modifying additives either contain unsaturated bonds or contain special functional groups,Or cyclic organic compounds, etc. The problem of elution of transition metals is common in the form of Li (Ni, co, mn) O 2 、LiFePO 4 、LiMn 2 O 4 In a lithium ion battery which is equal to the positive electrode material, dissolved metal ions are deposited on the surface of a negative electrode in the form of metal simple substance or metal salt is deposited on the surface of the negative electrode, and the deposited metal simple substance and metal ions can have adverse effects on an SEI film, for example, deposited Mn is pointed out in the paper of research on the capacity attenuation process of lithium manganate-graphite battery and the regulation and control method thereof 2+ Ions reduce Li of SEI film + Conductivity capability.
Chinese patent application No. CN202111545635.6, namely lithium ion battery electrolyte, and preparation method and application thereof, provides lithium ion battery electrolyte, and preparation method and application thereof. The electrolyte comprises an organic solvent, lithium salt and an additive, wherein the additive comprises vinylene carbonate and lithium bifluoride oxalate borate. The disadvantage is that the cycle life at high temperatures is still limited.
In summary, in order to meet the requirements of ultra-long cycle life, high safety and high energy density of the lithium ion battery in a high-temperature environment, the existing lithium ion battery electrolyte is still to be developed.
Disclosure of Invention
In order to solve the problems of low cycle life, low safety and need of improving energy density of a lithium ion battery in a high-temperature environment in the prior art, the invention provides a lithium ion battery electrolyte which comprises an additive 1, an additive 2, lithium salt and an organic solvent. The materials of the invention are cheap and easy to obtain, the reaction condition is mild, and the prepared lithium ion battery has high energy density, has ultra-long cycle life under high temperature environment and also has safety.
The specific technical scheme of the invention is as follows:
in a first aspect, the present invention provides a lithium ion battery electrolyte comprising:
additive 1 and additive 2, lithium salt, and organic solvent.
The lithium ion battery electrolyte of the invention takes an additive 1, an additive 2, lithium salt and an organic solvent as main components, wherein the additive 2 is a common lithium ion battery additive, and the additive 1 contains unsaturated bonds, or contains special functional groups, or is a cyclic organic matter and the like as a negative electrode film-forming additive for modifying SEI. The additive 1 and the additive 2 cooperate to improve the performance of the electrolyte of the lithium ion battery and prolong the cycle life of the lithium ion battery in a high-temperature environment. The additive 1 and the additive 2 have excellent synergistic effect, so that the lithium ion battery electrolyte has stable performance under the high-temperature condition, and the prepared lithium ion battery has high energy density and has ultra-long cycle life under the high-temperature environment.
Preferably, the structural formula of the additive 1 is as follows:
wherein R1 is H, CH 3 、CH 2 CH 3 、OCH 3 、OCH 2 CH 3 、CH 2 OCH 3 Or CH (CH) 2 OCH 2 CH 3 One of the following; r2 is ch=ch 2 、CH＝CHCH 3 、CH 2 CH＝CH 2 、CH 2 CH＝CH 2 Or CH (CH) 2 CH＝CHCH 3 One of them.
The problem of transition metal dissolution generally exists in lithium ion batteries, and dissolved metal ions are deposited on the surface of a negative electrode in the form of metal simple substances or metal salts, so that the deposited metal simple substances and metal ions can have adverse effects on an SEI film. The additive 1 is a silicon-oxygen cyclic organic additive containing unsaturated functional groups, the organic additive forms six-membered rings by silicon oxygen and contains unsaturated double bond functional groups, and the organic additive is used as a negative electrode film forming additive to be added into electrolyte, can modify SEI and improve Li of SEI film + Conductivity capability. The polymer coating anode is formed by polymerization reaction of unsaturated functional groups of the additive 1, so that the stability of SEI can be improved, and the extension of lithium ions can be achievedThe purpose of battery cycle life.
Preferably, R1 of the additive 1 is CH 3 R2 is ch=ch 2 。
Preferably, the mass ratio of the additive 1 to the lithium ion battery electrolyte is (0.5-3): 100.
more preferably, the mass ratio of the additive 1 to the lithium ion battery electrolyte is (0.5 to 1): 100.
according to the invention, based on experiments and theoretical researches, when the mass ratio of the additive 1 to the lithium ion battery electrolyte is more than 3%, the performance of the electrolyte is reduced, and the reason is supposed to be that the additive 1 is used as a negative electrode film forming additive to act together with the additive 2, so that side reactions occur, byproducts are generated, and further the battery reaction is inhibited. Based on the above, the invention controls the mass ratio of the additive 1 to the lithium ion battery electrolyte to be (0.5-3): between 100, the formation of byproducts can be reduced, and the performance of the electrolyte can be optimized. The mass ratio of the additive 1 to the lithium ion battery electrolyte is preferably controlled to be (0.5-1): 100, the performance of the electrolyte can be optimized to the greatest extent, the battery capacity is improved, and the cycle life is prolonged.
Preferably, the additive 2 is one or more of vinylene carbonate, fluoroethylene carbonate, 1, 3-propane sultone, ethylene sulfate, 1, 3-propylene sultone, methylene methane disulfonate, tris (trimethylsilane) phosphite, tris (trimethylsilane) borate, lithium difluorodioxalate phosphate, lithium dioxalate borate, lithium difluorophosphate, adiponitrile and octadinitrile.
More preferably, the additive 2 is one or more of vinylene carbonate, fluoroethylene carbonate, 1, 3-propane sultone, tris (trimethylsilane) borate, lithium difluorodioxalate phosphate and octadinitrile.
Additive 2 is added as a common lithium ion battery additive to lithium ion battery electrolytes due to the problem of cyclic capacity decay caused by periodic growth of the SEI film. By the technical proposal, the additive 2 improves Li + Is built up on the electrode surfaceAnd a low-impedance interface SEI film is built, so that quick exchange reaction of charges on the surface of the electrode is facilitated, and each performance of the lithium ion battery is excellent under a wide temperature range. Academic recognition shows that after VC obtains electrons, unsaturated bonds are opened to generate high polymer Li-Poly (VC), and the high polymer can reduce the risk of SEI film damage in the graphite expansion process, thereby being beneficial to improving SEI stability. According to the invention, based on experiments and theoretical researches, when the additive 2 is one or more of vinylene carbonate, fluoroethylene carbonate, 1, 3-propane sultone, tri (trimethylsilane) borate, difluoro lithium phosphate and octadinitrile, the performance of the electrolyte can be optimized to the greatest extent, the battery capacity is improved, and the cycle life is prolonged.
Preferably, the mass ratio of the additive 2 to the lithium ion battery electrolyte is (0.5-5): 100.
preferably, the lithium salt is one or more of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium dioxaborate, lithium bis (fluorosulfonyl) imide and lithium bis (trifluoromethanesulfonyl) imide.
More preferably, the lithium salt is lithium hexafluorophosphate and/or lithium bis-fluorosulfonyl imide.
Preferably, the mass ratio of the lithium salt to the lithium ion battery electrolyte is (6-25): 100.
preferably, the organic solvent is 2 to 4 of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, methyl formate, methyl acetate, methyl propionate and ethyl acetate.
In a second aspect, the invention provides an application of a lithium ion battery electrolyte in a lithium ion battery.
Preferably, the positive electrode material of the lithium ion battery is Li (Ni, co, mn) O 2 、Li(Ni,Co,Al)O 2 、Li(Mn,Fe)PO 4 、xLi 2 MnO 3 ·(1-x)LiMO 2 (M＝Ni,Co,Mn)、Li(Mn,M) 2 O 4 (m=ni, co, mn) and LiFePO 4 One or two or more of them; the negative electrode material of the lithium ion battery is one or more than two of graphite, mesophase carbon microspheres, silicon oxide and silicon.
Compared with the prior art, the invention has the following advantages:
(1) The materials are cheap and easy to obtain, the reaction condition is mild, the prepared lithium ion battery has high energy density, has ultra-long cycle life under a high-temperature environment, and meanwhile, has good economic benefit, and is easy for industrial production;
(2) The additive 1 is a silicon-oxygen cyclic organic additive containing unsaturated functional groups, the organic additive forms six-membered rings by silicon oxygen and contains unsaturated double bond functional groups, and the organic additive is used as a negative electrode film forming additive to be added into electrolyte, can modify SEI and improve Li of SEI film + Conductivity capability. The polymer coating anode is formed through the polymerization reaction of the unsaturated functional groups of the additive 1, so that the stability of SEI can be improved, and the purpose of prolonging the cycle life of the lithium ion battery can be achieved;
(3) The invention controls the mass ratio of the additive 1 and the lithium ion battery electrolyte to be (0.5-3): between 100, the formation of byproducts can be reduced, and the performance of the electrolyte can be optimized.
Drawings
Fig. 1 is a graph of the high temperature cycle of the experimental battery of example 1.
Fig. 2 is a graph of the high temperature cycling of the experimental battery of example 2.
Detailed Description
General examples
A lithium ion battery electrolyte, characterized in that the lithium ion battery electrolyte comprises:
additive 1 and additive 2, lithium salt, and organic solvent.
Preferably, the structural formula of the additive 1 is as follows:
wherein R1 is H, CH 3 、CH 2 CH 3 、OCH 3 、OCH 2 CH 3 、CH 2 OCH 3 Or CH (CH) 2 OCH 2 CH 3 In (a) and (b)One of the two; r2 is ch=ch 2 、CH＝CHCH 3 、CH 2 CH＝CH 2 、CH 2 CH＝CH 2 Or CH (CH) 2 CH＝CHCH 3 One of them.
Preferably, R1 of the additive 1 is CH 3 R2 is ch=ch 2 。
Preferably, the mass ratio of the additive 1 to the lithium ion battery electrolyte is (0.5-3): 100.
more preferably, the mass ratio of the additive 1 to the lithium ion battery electrolyte is (0.5 to 1): 100.
preferably, the additive 2 is one or more of vinylene carbonate, fluoroethylene carbonate, 1, 3-propane sultone, ethylene sulfate, 1, 3-propylene sultone, methylene methane disulfonate, tris (trimethylsilane) phosphite, tris (trimethylsilane) borate, lithium difluorodioxalate phosphate, lithium dioxalate borate, lithium difluorophosphate, adiponitrile and octadinitrile.
More preferably, the additive 2 is one or more of vinylene carbonate, fluoroethylene carbonate, 1, 3-propane sultone, tris (trimethylsilane) borate, lithium difluorodioxalate phosphate and octadinitrile.
Preferably, the mass ratio of the additive 2 to the lithium ion battery electrolyte is (0.5-5): 100.
preferably, the lithium salt is one or more of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium dioxalate borate, lithium bis (fluorosulfonyl) imide and lithium bis (trifluoromethanesulfonyl) imide.
More preferably, the lithium salt is lithium hexafluorophosphate and/or lithium bis-fluorosulfonyl imide.
Preferably, the mass ratio of the lithium salt to the lithium ion battery electrolyte is (6-25): 100.
preferably, the organic solvent is 2 to 4 of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, methyl formate, methyl acetate, methyl propionate and ethyl acetate.
An application of lithium ion battery electrolyte in a lithium ion battery.
Preferably, the positive electrode material of the lithium ion battery is Li (Ni, co, mn) O 2 、Li(Ni,Co,Al)O 2 、Li(Mn,Fe)PO 4 、xLi 2 MnO 3 ·(1-x)LiMO 2 (M＝Ni,Co,Mn)、Li(Mn,M) 2 O 4 (m=ni, co, mn) and LiFePO 4 One or two or more of them; the negative electrode material of the lithium ion battery is one or more than two of graphite, mesophase carbon microspheres, silicon oxide and silicon.
The invention is further described below in connection with specific embodiments.
In the present invention, unless otherwise specified, the materials and equipment used are commercially available or are commonly used in the art, and the methods in the examples are conventional in the art unless otherwise specified.
Example 1
1. Preparing a positive plate of the lithium ion battery: taking 4750g of lithium manganate, 100g of polyvinylidene fluoride, 100g of conductive carbon black and 50g of titanium oxide; homogenizing, coating, rolling and die cutting are carried out according to the manufacturing procedure of the positive plate of the lithium ion battery.
2. Preparing a lithium ion battery negative plate: taking 4800g of graphite, 75g of sodium carboxymethyl cellulose, 75g of conductive carbon black and 50g of styrene-butadiene rubber; and then homogenizing, coating, rolling and die cutting are carried out according to the manufacturing procedure of the lithium ion battery negative plate.
3. Assembling a battery: and assembling the positive and negative plates into a 10Ah soft package battery according to the manufacturing flow of the lithium ion battery.
4, preparing electrolyte: the required electrolyte was prepared according to the formulation table shown in table 1. And the baking of the battery adopts a vacuum baking process, and when the water content of the positive and negative plates is less than or equal to 200ppm, the battery is baked to be qualified, and the liquid injection coefficient of the battery is 3.95g/Ah. The experimental batteries were group numbered by recipe name. After the battery liquid injection is completed, the battery liquid is produced according to the working procedures of aging, formation, secondary sealing, capacity division and the like of a common lithium ion battery.
TABLE 1 electrolyte formulation table
Wherein R1 of additive 1 is a CH3 functional group and R2 of additive 1 is a ch=ch2 functional group; in an organic solvent, the preparation is carried out according to the volume ratio of ethylene carbonate/propylene carbonate/dimethyl carbonate/methyl ethyl carbonate=5/2/5/4.
5, testing: the test battery is charged according to 0.5C multiplying power and discharged according to 1.0C multiplying power for the high-temperature circulation test. The cyclic test results are shown in fig. 1.
Compared with the experimental batteries of the formula 1 and the formula 2, the electrolyte of the formula 2 is added with the additive 1 with the mass fraction of 3 percent, so that the experimental battery has more excellent performance, the battery capacity is improved, and the cycle life is prolonged.
Compared with the experimental batteries of the formula 3 and the formula 4, the electrolyte of the formula 4 is added with the additive 1 with the mass fraction of 0.5%, so that the experimental battery has more excellent performance, the battery capacity is improved, and the cycle life is prolonged.
Compared with the experimental batteries of the formula 5 and the formula 6, the electrolyte of the formula 5 is not added with the additive 1 with the mass fraction of 3.5%, so that the experimental battery has more excellent performance, the battery capacity is improved, and the cycle life is prolonged. The team of the invention discovers that the mass ratio of the additive 1 to the lithium ion battery electrolyte is preferably controlled to be (0.5-3) based on experiments and theoretical researches: 100, the performance of the electrolyte can be improved, the battery capacity can be improved, and the cycle life can be prolonged. When the mass ratio of the additive 1 to the lithium ion battery electrolyte is more than 3%, the performance of the electrolyte is lowered, presumably because the additive 1 is used as a negative electrode film-forming additive, and an excessively high content suppresses the battery reaction.
Example 2
1. Preparing a positive plate of the lithium ion battery: 4275g of lithium manganate, 475 g of NCM, 100g of polyvinylidene fluoride, 100g of conductive carbon black and 50g of titanium oxide are taken, and the steps of homogenizing, coating, rolling and die cutting are carried out according to the manufacturing procedures of the positive plate of the lithium ion battery.
2. Preparing a lithium ion battery negative plate: taking 4800g of graphite, 75g of sodium carboxymethyl cellulose, 75g of conductive carbon black and 50g of styrene-butadiene rubber; and then homogenizing, coating, rolling and die cutting are carried out according to the manufacturing procedure of the lithium ion battery negative plate.
3. Assembling a battery: and assembling the positive and negative plates into a 10Ah soft package battery according to the manufacturing flow of the lithium ion battery.
4, preparing electrolyte: the required electrolyte was prepared according to the formulation table shown in table 2. And the baking of the battery adopts a vacuum baking process, and when the water content of the positive and negative plates is less than or equal to 200ppm, the battery is baked to be qualified, and the liquid injection coefficient of the battery is 3.95g/Ah. The experimental batteries were group numbered by recipe name. After the battery liquid injection is completed, the battery liquid is produced according to the working procedures of aging, formation, secondary sealing, capacity division and the like of a common lithium ion battery.
TABLE 2 electrolyte formulation table
Wherein R1 of additive 1 is a CH3 functional group and R2 of additive 1 is a ch=ch2 functional group; in an organic solvent, the composition was prepared in a ratio of "ethylene carbonate/propylene carbonate/dimethyl carbonate/methylethyl carbonate=5/1/5/5" by volume.
5, testing: the test battery is charged according to 0.5C multiplying power and discharged according to 1.0C multiplying power for the high-temperature circulation test. The cyclic test results are shown in fig. 2.
Compared with the experimental batteries of the formula 1 and the formula 2, the electrolyte of the formula 2 is added with the additive 1 with the mass fraction of 1 percent, so that the experimental battery has more excellent performance, the battery capacity is improved, and the cycle life is prolonged.
Compared with the experimental batteries of the formula 3 and the formula 4, the electrolyte of the formula 4 is added with the additive 1 with the mass fraction of 0.5%, so that the experimental battery has more excellent performance, the battery capacity is improved, and the cycle life is prolonged.
Example 3
1. Preparing a positive plate of the lithium ion battery: 4275g of lithium manganate, 475 g of NCM, 100g of polyvinylidene fluoride, 100g of conductive carbon black and 50g of titanium oxide are taken, and the steps of homogenizing, coating, rolling and die cutting are carried out according to the manufacturing procedures of the positive plate of the lithium ion battery.
2. Preparing a lithium ion battery negative plate: taking 4800g of graphite, 75g of sodium carboxymethyl cellulose, 75g of conductive carbon black and 50g of styrene-butadiene rubber; and then homogenizing, coating, rolling and die cutting are carried out according to the manufacturing procedure of the lithium ion battery negative plate.
3. Assembling a battery: and assembling the positive and negative plates into a 10Ah soft package battery according to the manufacturing flow of the lithium ion battery.
4, preparing electrolyte: the required electrolyte was prepared according to the recipe shown in table 3. And the baking of the battery adopts a vacuum baking process, and when the water content of the positive and negative plates is less than or equal to 200ppm, the battery is baked to be qualified, and the liquid injection coefficient of the battery is 3.95g/Ah. The experimental batteries were group numbered by recipe name. After the battery liquid injection is completed, the battery liquid is produced according to the working procedures of aging, formation, secondary sealing, capacity division and the like of a common lithium ion battery.
TABLE 3 electrolyte formulation table
Wherein R1 of additive 1 is an H functional group and R2 of additive 1 is a ch=chch3 functional group; in an organic solvent, the composition was prepared in a ratio of "ethylene carbonate/propylene carbonate/diethyl carbonate/methyl formate=5/1/5/5" by volume.
5, testing: the test battery is charged according to 0.5C multiplying power and discharged according to 1.0C multiplying power for the high-temperature circulation test.
6, result: when the cycle times of the experimental battery of the formula 1 reach 470 times, the battery capacity is reduced to 72 percent; when the cycle times of the experimental battery of the formula 2 reach 485 times, the battery capacity is reduced to 74%; when the cycle number of the experimental battery in the formula 3 reaches 480 times, the battery capacity is reduced to 67%; when the cycle number of the experimental battery in the formula 4 reaches 200 times, the battery capacity is reduced to 65%; when the cycle number of the experimental battery in the formula 5 reaches 480 times, the battery capacity is reduced to 75%; when the number of experimental battery cycles of formulation 6 reached 430, the battery capacity was reduced to 70%.
Compared with the experimental batteries of formulas 1-4, the lithium ion battery electrolyte of formula 2 is added with the additive 1 with the mass fraction of 1% and the additive 2 with the mass fraction of 2.0%, so that the lithium ion battery has more excellent performance, the battery capacity is improved, and the cycle life is prolonged. The lithium ion battery electrolyte of the formula 1 and the formula 3 is only added with a single additive, and the electrolyte performance is limited in optimization.
The experimental cells of formulation 6 exhibited poor performance compared to the experimental cells of formulations 2, 5 and 6. The electrolyte of the formula 2 is added with the additive 2 with the mass fraction of 2.0 percent, and the electrolyte of the formula 5 is added with the additive 2 with the mass fraction of 0.5 percent, so that the battery has more excellent performance, the battery capacity is improved, and the cycle life is prolonged. The team of the invention discovers that the mass ratio of the additive 2 to the lithium ion battery electrolyte is preferably controlled to be (0.5-5): 100, the performance of the electrolyte can be improved, the battery capacity can be improved, and the cycle life can be prolonged. When the mass ratio of the additive 2 to the lithium ion battery electrolyte is less than 0.5%, the performance of the electrolyte may be degraded.
Example 4
1. Preparing a positive plate of the lithium ion battery: taking 4750g of lithium manganate, 100g of polyvinylidene fluoride, 100g of conductive carbon black and 50g of titanium oxide; homogenizing, coating, rolling and die cutting are carried out according to the manufacturing procedure of the positive plate of the lithium ion battery.
2. Preparing a lithium ion battery negative plate: taking 4800g of graphite, 75g of sodium carboxymethyl cellulose, 75g of conductive carbon black and 50g of styrene-butadiene rubber; and then homogenizing, coating, rolling and die cutting are carried out according to the manufacturing procedure of the lithium ion battery negative plate.
3. Assembling a battery: and assembling the positive and negative plates into a 10Ah soft package battery according to the manufacturing flow of the lithium ion battery.
4, preparing electrolyte: the required electrolyte was prepared according to the formulation table shown in table 1. And the baking of the battery adopts a vacuum baking process, and when the water content of the positive and negative plates is less than or equal to 200ppm, the battery is baked to be qualified, and the liquid injection coefficient of the battery is 3.95g/Ah. The experimental batteries were group numbered by recipe name. After the battery liquid injection is completed, the battery liquid is produced according to the working procedures of aging, formation, secondary sealing, capacity division and the like of a common lithium ion battery.
Table 4 electrolyte formulation table
Wherein R1 of additive 1 is an OCH3 functional group, and R2 of additive 1 is a ch=ch2 functional group; in an organic solvent, the preparation is carried out according to the volume ratio of ethylene carbonate/propylene carbonate/methyl acetate/methyl ethyl carbonate=5/2/5/4.
5, testing: the test battery is charged according to 0.5C multiplying power and discharged according to 1.0C multiplying power for the high-temperature circulation test.
6, result: when the cycle number of the experimental battery of the formula 1 reaches 490 times, the battery capacity is reduced to 76%; when the number of the experimental battery cycles of the formula 2 reaches 450, the battery capacity is reduced to 70%.
Compared with the experimental batteries of the formula 1 and the formula 2, the electrolyte of the formula 1 adopts the vinylene carbonate as the additive 2, so that the battery has more excellent performance, the battery capacity is improved, and the cycle life is prolonged. According to the invention, based on experiments and theoretical researches, when the additive 2 is vinylene carbonate, fluoroethylene carbonate, 1, 3-propane sultone, tri (trimethylsilane) borate, difluoro lithium phosphate oxalate and octadinitrile, the performance of the electrolyte can be improved, the battery capacity can be improved, and the cycle life can be prolonged.
Example 5
1. Preparing a positive plate of the lithium ion battery: taking 4750g of lithium manganate, 100g of polyvinylidene fluoride, 100g of conductive carbon black and 50g of titanium oxide; homogenizing, coating, rolling and die cutting are carried out according to the manufacturing procedure of the positive plate of the lithium ion battery.
2. Preparing a lithium ion battery negative plate: taking 4800g of graphite, 75g of sodium carboxymethyl cellulose, 75g of conductive carbon black and 50g of styrene-butadiene rubber; and then homogenizing, coating, rolling and die cutting are carried out according to the manufacturing procedure of the lithium ion battery negative plate.
3. Assembling a battery: and assembling the positive and negative plates into a 10Ah soft package battery according to the manufacturing flow of the lithium ion battery.
4, preparing electrolyte: the required electrolyte was prepared according to the formulation table shown in table 1. And the baking of the battery adopts a vacuum baking process, and when the water content of the positive and negative plates is less than or equal to 200ppm, the battery is baked to be qualified, and the liquid injection coefficient of the battery is 3.95g/Ah. The experimental batteries were group numbered by recipe name. After the battery liquid injection is completed, the battery liquid is produced according to the working procedures of aging, formation, secondary sealing, capacity division and the like of a common lithium ion battery.
TABLE 5 electrolyte formulation table
Wherein the organic solvent is formulated in a ratio of "ethylene carbonate/propylene carbonate/methyl propionate/ethyl acetate=5/2/5/4" by volume. In formula 1, R1 of additive 1 is CH 2 CH 3 Functional group, R2 of additive 1 is CH 2 CH＝CH 2 A functional group; in formula 2, R1 of additive 1 is OCH 2 CH 3 R2 is CH 2 CH＝CHCH 3 The method comprises the steps of carrying out a first treatment on the surface of the In formula 3, R1 of additive 1 is CH 2 OCH 3 R2 is CH 2 CH＝CHCH 3 The method comprises the steps of carrying out a first treatment on the surface of the In formula 4, R1 of additive 1 is CH 2 OCH 2 CH 3 R2 is CH 2 CH＝CH 2 。
5, testing: the test battery is charged according to 0.5C multiplying power and discharged according to 1.0C multiplying power for the high-temperature circulation test.
6, result: when the cycle number of the experimental battery in the formula 1 reaches 480 times, the battery capacity is reduced to 72 percent; when the cycle times of the experimental battery of the formula 2 reach 485 times, the battery capacity is reduced to 70%; when the cycle number of the experimental battery in the formula 3 reaches 480 times, the battery capacity is reduced to 75%; when the number of experimental battery cycles of formulation 4 reached 475, the battery capacity was reduced to 75%.
According to the embodiment, the lithium ion battery electrolyte provided by the invention has good performance, and the prepared lithium ion battery has long cycle life, good economic benefit and easy industrial production.
The raw materials and equipment used in the invention are common raw materials and equipment in the field unless specified otherwise; the methods used in the present invention are conventional in the art unless otherwise specified.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent transformation of the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. A lithium ion battery electrolyte, characterized in that the lithium ion battery electrolyte comprises:
additive 1 and additive 2, lithium salt, and organic solvent.
2. The lithium ion battery electrolyte of claim 1, wherein the additive 1 has the following structural formula:
wherein R1 is H, CH 3 、CH 2 CH 3 、OCH 3 、OCH 2 CH 3 、CH 2 OCH 3 Or CH (CH) 2 OCH 2 CH 3 One of the following; r2 is ch=ch 2 、CH＝CHCH 3 、CH 2 CH＝CH 2 、CH 2 CH＝CH 2 Or CH (CH) 2 CH＝CHCH 3 One of them.
3. The lithium ion battery electrolyte according to claim 1, wherein the mass ratio of the additive 1 to the lithium ion battery electrolyte is (0.5 to 3): 100.
4. the lithium ion battery electrolyte according to claim 3, wherein the mass ratio of the additive 1 to the lithium ion battery electrolyte is (0.5 to 1): 100.
5. the lithium ion battery electrolyte of claim 1, wherein the additive 2 is one or more of vinylene carbonate, fluoroethylene carbonate, 1, 3-propane sultone, vinyl sulfate, 1, 3-propenesulfonic acid lactone, methylene methane disulfonate, tris (trimethylsilane) phosphite, tris (trimethylsilane) borate, lithium difluorodioxalate phosphate, lithium dioxalate borate, lithium difluorophosphate, adiponitrile, and octadinitrile.
6. The lithium ion battery electrolyte according to claim 1, wherein the mass ratio of the additive 2 to the lithium ion battery electrolyte is (0.5 to 5): 100.
7. the lithium ion battery electrolyte of claim 1, wherein the lithium salt is one or more of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium dioxalate borate, lithium bis-fluorosulfonyl imide, and lithium bis-trifluoromethanesulfonyl imide.
8. The lithium ion battery electrolyte of claim 1, wherein the organic solvent is 2-4 of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, methylethyl carbonate, methyl formate, methyl acetate, methyl propionate, and ethyl acetate.
9. Use of the lithium ion battery electrolyte according to any one of claims 1 to 8 in a lithium ion battery.
10. The use according to claim 9, wherein the positive electrode material of the lithium ion battery is Li (Ni, co, mn) O 2 、Li(Ni,Co,Al)O 2 、Li(Mn,Fe)PO 4 、xLi 2 MnO 3 ·(1-x)LiMO 2 (M＝Ni,Co,Mn)、Li(Mn,M) 2 O 4 (m=ni, co, mn) and LiFePO 4 One or two or more of them; the negative electrode material of the lithium ion battery is one of graphite, mesophase carbon microspheres, silicon oxide and siliconOr two or more kinds.
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