CN117393854A - Electrolyte additive for improving high-temperature and high-voltage cycling stability of lithium-rich electrode material and electrolyte - Google Patents
Electrolyte additive for improving high-temperature and high-voltage cycling stability of lithium-rich electrode material and electrolyte Download PDFInfo
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- CN117393854A CN117393854A CN202311546171.XA CN202311546171A CN117393854A CN 117393854 A CN117393854 A CN 117393854A CN 202311546171 A CN202311546171 A CN 202311546171A CN 117393854 A CN117393854 A CN 117393854A
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 85
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 38
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 239000002000 Electrolyte additive Substances 0.000 title claims abstract description 34
- 239000007772 electrode material Substances 0.000 title claims abstract description 31
- 230000001351 cycling effect Effects 0.000 title claims abstract description 27
- 239000002904 solvent Substances 0.000 claims description 30
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 18
- -1 lithium hexafluorophosphate Chemical compound 0.000 claims description 10
- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 claims description 10
- 150000005678 chain carbonates Chemical class 0.000 claims description 9
- 150000005676 cyclic carbonates Chemical class 0.000 claims description 9
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims description 7
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-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 7
- HNAGHMKIPMKKBB-UHFFFAOYSA-N 1-benzylpyrrolidine-3-carboxamide Chemical compound C1C(C(=O)N)CCN1CC1=CC=CC=C1 HNAGHMKIPMKKBB-UHFFFAOYSA-N 0.000 claims description 5
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 claims description 5
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 5
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 5
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 claims description 5
- OBNCKNCVKJNDBV-UHFFFAOYSA-N butanoic acid ethyl ester Natural products CCCC(=O)OCC OBNCKNCVKJNDBV-UHFFFAOYSA-N 0.000 claims description 5
- 150000007942 carboxylates Chemical class 0.000 claims description 5
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 5
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 4
- 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
- IGILRSKEFZLPKG-UHFFFAOYSA-M lithium;difluorophosphinate Chemical compound [Li+].[O-]P(F)(F)=O IGILRSKEFZLPKG-UHFFFAOYSA-M 0.000 claims description 3
- 239000003660 carbonate based solvent Substances 0.000 claims description 2
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 claims 2
- 150000001733 carboxylic acid esters Chemical class 0.000 claims 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 9
- 239000000654 additive Substances 0.000 abstract description 9
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 9
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 abstract description 6
- 230000000996 additive effect Effects 0.000 abstract description 5
- 125000000524 functional group Chemical group 0.000 abstract description 4
- 150000002825 nitriles Chemical class 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 12
- 239000008151 electrolyte solution Substances 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- GEWWCWZGHNIUBW-UHFFFAOYSA-N 1-(4-nitrophenyl)propan-2-one Chemical compound CC(=O)CC1=CC=C([N+]([O-])=O)C=C1 GEWWCWZGHNIUBW-UHFFFAOYSA-N 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910009055 Li1.2Ni0.2Mn0.6O2 Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 125000003342 alkenyl group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 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
- H01M10/056—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
-
- 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 an electrolyte additive and electrolyte for improving high-temperature and high-voltage cycling stability of a lithium-rich electrode material, and provides an electrolyte additive for a lithium ion battery, wherein the molecular structure of the additive takes nitrile benzene as a basic skeleton, and simultaneously, -F, -CN and-S (=O) are introduced on carbon at 2-6 positions of a benzene ring 2 CF 3 、‑S(＝O) 2 C 2 H 2 CN、CF 3 The additive can exert the synergistic effect of each functional group in the molecular structure, and modify the film on the surface of the lithium-rich electrode material, so that the electrode material has excellent cycling stability under the working condition of high temperature of 55 ℃ and high voltage of 4.8V.
Description
Technical Field
The invention relates to the technical field of electrolyte additives, in particular to an electrolyte additive and electrolyte for improving high-temperature and high-voltage cycling stability of a lithium-rich electrode material.
Background
The application of the lithium ion battery is expanded from the wide portable electronic product field to the fields of electric automobiles, energy storage and the like due to the advantages of high energy density, high power, long cycle life and the like. However, as the requirements of the electric vehicle on the endurance mileage can be continuously improved and the ultra-large requirement of the energy storage application end on the electric quantity appears, the energy density of the lithium ion battery needs to be further improved. Meanwhile, in view of the complexity and variety of the application environments of electric automobiles and energy storage, the lithium ion battery is required to keep stable performance under various severe working conditions, wherein high-temperature stability is one of key indexes of the lithium ion battery, and the safety and the cycle life of the battery are directly affected. Therefore, it is extremely important to satisfy both high energy density and high temperature stable battery related technologies.
Lithium-rich materials are currently the most potential positive electrode materials for improving the energy density of lithium ion batteries, but must exhibit their high capacity characteristics at high voltages (4.8V or more). However, on one hand, the electrolyte systems of lithium ion batteries which are commercialized at present have risks of decomposition after high voltage (more than 4.5V), and on the other hand, the high-temperature environment not only aggravates the decomposition of the electrolyte, but also accelerates the dissolution of manganese element in the electrode material, so that the material structure collapses, and finally the service life of the battery is rapidly ended. Therefore, for lithium-rich materials, a technique that satisfies high energy density and high temperature stability is to satisfy stability at high voltage and high temperature. Currently, for some aspect of the problem, it is necessary to use electrolyte additives containing a specific functional group. For example, nitrile-containing additives are used to improve the high voltage stability of the electrolyte, F-containing additives are used to improve the high temperature stability of the battery, and unsaturated functional groups such as alkenyl groups, sulfonic acid groups and the like are used to form a film on the electrode surface. In practical application, various additives are needed to be added to realize the compounding of functions of high voltage, high temperature stability and the like, which increases the complexity of the electrolyte preparation process and also increases the preparation cost and the uncontrollable factors of the system.
Disclosure of Invention
One of the objects of the present invention is: aiming at the problem of poor cycle stability of lithium-rich electrode materials under severe conditions of high voltage and high Wen Shuangchong, the electrolyte additive, the electrolyte system and the application scheme thereof are provided, wherein the electrolyte additive and the electrolyte system can effectively improve the cycle stability of the lithium-rich electrode materials at high voltage and high temperature of 55 DEG C
The invention also aims at: aiming at the defect that the existing lithium ion battery electrolyte needs to be compounded with different additives to meet the purpose of functional compounding, the additive with a multifunctional structure is provided, the film forming function can be simultaneously solved, and the cycle stability at high voltage and high temperature of 55 ℃ is realized.
In order to achieve the above purpose, the present invention provides the following technical solutions:
an electrolyte additive for improving high-temperature and high-voltage cycling stability of a lithium-rich electrode material, wherein the electrolyte additive has the following structural formula:
wherein R1 to R5 are-F, -CN, -S (=O) 2 CF 3 、-S(＝O) 2 C 2 H 2 CN、CF 3 One or more of them.
Preferably, R1 to R5 are symmetrically selected from-F and-CN.
It is another object of embodiments of the present invention to provide an electrolyte for improving high temperature and high voltage cycling stability of a lithium-rich electrode material, the electrolyte comprising the above electrolyte additive.
Preferably, the concentration of the electrolyte additive in the electrolyte is 0.2 to 2.0wt%.
Preferably, the concentration of the electrolyte additive in the electrolyte is 1.0wt%.
Preferably, the electrolyte further comprises an electrolyte solvent and an electrolyte solute;
the electrolyte solvent is one or more of a chain carbonate solvent, a cyclic carbonate solvent and a carboxylate solvent; the electrolyte solute is one or more of lithium hexafluorophosphate, lithium perchlorate, lithium tetrafluoroborate, lithium bisoxalato borate, lithium difluoro bisoxalato borate, lithium difluorophosphate and lithium bistrifluoromethane sulfonyl imide.
Preferably, the electrolyte solvent is composed of a chain carbonate and a cyclic carbonate solvent; the electrolyte solute is lithium hexafluorophosphate.
Preferably, the chain carbonate solvent is at least one of dimethyl carbonate (DMC), ethylmethyl carbonate (EMC), and diethyl carbonate (DEC).
Preferably, the cyclic carbonate-based solvent is at least one of Ethylene Carbonate (EC), fluoroethylene carbonate (FEC), propylene Carbonate (PC) and γ -butyrolactone (GBL).
Preferably, the carboxylate solvent is at least one of Methyl Formate (MF), ethyl Acetate (EA), ethyl Butyrate (EB), and Methyl Acetate (MA).
Compared with the prior art, the invention has the beneficial effects that: the invention provides a lithium ion battery electrolyte additive, the molecular structure of the additive takes nitrile benzene as a basic framework, and simultaneously, -F, -CN, -S (=O) is introduced on 2-6 carbon of benzene ring 2 CF 3 、-S(＝O) 2 C 2 H 2 CN、CF 3 The additive can exert the synergistic effect of each functional group in the molecular structure, and modify the film on the surface of the lithium-rich electrode material, so that the electrode material has excellent cycling stability under the working condition of high temperature of 55 ℃ and high voltage of 4.8V.
Drawings
Fig. 1 is a graph showing the cycle performance of a battery assembled using the electrolytes described in example 1 and comparative examples 1 to 4 of the present invention.
Fig. 2 is a graph showing the cyclic charge and discharge efficiency of a battery assembled using the electrolytes described in example 1 and comparative examples 1 to 4 of the present invention.
Fig. 3 is an ac impedance chart of a battery assembled using the electrolytes described in example 1 and comparative examples 1 to 4 of the present invention.
Fig. 4 is an SEM image of a positive electrode sheet after cycling of a battery assembled using the electrolytes described in example 1 and comparative examples 1-4 of the present invention.
Detailed Description
The technical scheme of the patent is further described in detail below with reference to the specific embodiments.
In the embodiment of the invention, an electrolyte additive for improving the high-temperature and high-voltage cycling stability of a lithium-rich electrode material has the following structural formula:
wherein R1 to R5 are-F, -CN, -S (=O) 2 CF 3 、-S(＝O) 2 C 2 H 2 CN、CF 3 One or more of them.
Preferably, R1 to R5 are symmetrically selected from-F and-CN.
It is another object of embodiments of the present invention to provide an electrolyte for improving high temperature and high voltage cycling stability of a lithium-rich electrode material, the electrolyte comprising the above electrolyte additive.
In this embodiment, the electrolyte additive is present in the electrolyte at a concentration of 0.2 to 2.0wt%.
Preferably, the concentration of the electrolyte additive in the electrolyte is 1.0wt%.
In this embodiment, the electrolyte solution further includes an electrolyte solution solvent and an electrolyte solution solute;
the electrolyte solvent is one or more of a chain carbonate solvent, a cyclic carbonate solvent and a carboxylate solvent; the electrolyte solute is one or more of lithium hexafluorophosphate, lithium perchlorate, lithium tetrafluoroborate, lithium bisoxalato borate, lithium difluoro bisoxalato borate, lithium difluorophosphate and lithium bistrifluoromethane sulfonyl imide.
Preferably, the electrolyte solvent is composed of a chain carbonate and a cyclic carbonate solvent; the electrolyte solute is lithium hexafluorophosphate.
In this embodiment, the chain carbonate solvent is at least one of dimethyl carbonate (DMC), ethylmethyl carbonate (EMC) and diethyl carbonate (DEC).
In this embodiment, the cyclic carbonate solvent is at least one of Ethylene Carbonate (EC), fluoroethylene carbonate (FEC), propylene Carbonate (PC) and γ -butyrolactone (GBL).
In this embodiment, the carboxylate solvent is at least one of Methyl Formate (MF), ethyl Acetate (EA), ethyl Butyrate (EB), and Methyl Acetate (MA).
In order to make the technical solution of the present invention more clearly understood by those skilled in the art, the following specific examples will be presented.
Example 1
An electrolyte for improving the high-temperature and high-voltage cycling stability of a lithium-rich electrode material, which contains 1.0wt% of electrolyte additive. The chemical structure of the electrolyte additive is as follows:
wherein R1, R2, R4 and R5 are each F, and R3 is CN;
meanwhile, the electrolyte solvent is EC/EMC (3:7), the electrolyte solute is lithium hexafluorophosphate, and the concentration of the electrolyte is 1 mol.L -1 ；
The electrolyte is used to adopt lithium-rich Li 1.2 Ni 0.2 Mn 0.6 O 2 Is a positive electrode material, and is assembled into Li in a glove box 1.2 Ni 0.2 Mn 0.6 O 2 The Li battery is subjected to charge-discharge cycle test, related test and characterization under the condition of high temperature of 55 ℃ and voltage range of 2.0-4.8V, and the obtained result is recorded as 1.0 weight percent.
Example 2
An electrolyte for improving the high-temperature and high-voltage cycling stability of a lithium-rich electrode material, with reference to example 1, differs only in that the electrolyte solvent is EC/EMC/DMC/EA (2:2:5:1), and the electrolyte solute is lithium bisoxalato borate.
And a battery assembled using the electrolyte is provided, with particular reference to example 1.
Example 3
An electrolyte for improving the high-temperature and high-voltage cycling stability of a lithium-rich electrode material, referring to example 1, differs only in that the structural formula of the electrolyte additive is as follows:
wherein R1 is CN, R2, R3, R4 and R5 are each F;
and a battery assembled using the electrolyte is provided, with particular reference to example 1.
Example 4
An electrolyte for improving the high-temperature and high-voltage cycling stability of a lithium-rich electrode material, referring to example 1, differs only in that the structural formula of the electrolyte additive is as follows:
wherein R2 is CN, R1, R3, R4 and R5 are each F;
and a battery assembled using the electrolyte is provided, with particular reference to example 1.
Example 5
An electrolyte for improving the high-temperature and high-voltage cycling stability of a lithium-rich electrode material, referring to example 1, differs only in that the structural formula of the electrolyte additive is as follows:
wherein R1, R2, R4 and R5 are each F, and R3 is-S (=O) 2 RCN。
And a battery assembled using the electrolyte is provided, with particular reference to example 1.
Example 6
An electrolyte for improving the high-temperature and high-voltage cycling stability of a lithium-rich electrode material, referring to example 1, differs only in that the structural formula of the electrolyte additive is as follows:
wherein R1, R2, R4 and R5 are each F, and R3 is-S (=O) 2 CF 3 。
And a battery assembled using the electrolyte is provided, with particular reference to example 1.
Comparative example 1
An electrolyte, reference example 1, was made only in that the electrolyte additive described in example 1 was present in an electrolyte at a mass concentration of 0.2wt%, and the result was recorded as 0.2wt%.
And a battery assembled using the electrolyte is provided, with particular reference to example 1.
Comparative example 2
An electrolyte, reference example 1, was only different in that the electrolyte additive described in example 1 was 0.5wt% in mass concentration in the electrolyte, and the result was recorded as 0.5wt%.
And a battery assembled using the electrolyte is provided, with particular reference to example 1.
Comparative example 3
An electrolyte, reference example 1, was made only in that the electrolyte additive described in example 1 was present in an electrolyte at a mass concentration of 2.0wt%, and the result was recorded as 2.0wt%.
And a battery assembled using the electrolyte is provided, with particular reference to example 1.
Comparative example 4
An electrolyte (such as STD in fig. 1), referring to example 1, differs only in that it includes only the electrolyte solution and electrolyte solute in example 1, and the electrolyte additive of example 1 is not added.
And a battery assembled using the electrolyte is provided, with particular reference to example 1.
The cycle performance of the batteries assembled using the electrolytes described in example 1 and comparative examples 1 to 4 is shown in fig. 1; the cyclic charge and discharge efficiencies of the batteries assembled using the electrolytes of example 1 and comparative examples 1 to 4 of the present invention are shown in fig. 2; the ac resistance of the batteries assembled using the electrolytes described in example 1 and comparative examples 1 to 4 of the present invention is shown in fig. 3; SEM images of positive electrode sheets after cycling of the batteries assembled using the electrolytes described in example 1 and comparative examples 1 to 4 of the present invention are shown in fig. 4.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. An electrolyte additive for improving the high-temperature and high-voltage cycling stability of a lithium-rich electrode material is characterized by comprising the following structural formula:
wherein R1 to R5 are-F, -CN, -S (=O) 2 CF 3 、-S(＝O) 2 C 2 H 2 CN、CF 3 One or more of them.
2. The electrolyte additive for improving the high-temperature and high-voltage cycling stability of a lithium-rich electrode material according to claim 1, wherein R1 to R5 are symmetrically selected from-F and-CN.
3. An electrolyte for improving the high temperature and high voltage cycling stability of a lithium-rich electrode material, wherein the electrolyte comprises the electrolyte additive of claim 1.
4. The electrolyte for improving the high-temperature and high-voltage cycling stability of a lithium-rich electrode material according to claim 2, wherein the concentration of the electrolyte additive in the electrolyte is 0.2-2.0 wt%.
5. An electrolyte for improving the high temperature and high voltage cycling stability of a lithium-rich electrode material according to claim 3, wherein the concentration of the electrolyte additive in the electrolyte is 1.0% by weight.
6. The electrolyte for improving the high-temperature and high-voltage cycling stability of the lithium-rich electrode material according to claim 3, wherein the electrolyte further comprises an electrolyte solvent and an electrolyte solute;
the electrolyte solvent is one or more of a chain carbonate solvent, a cyclic carbonate solvent and a carboxylate solvent; the electrolyte solute is one or more of lithium hexafluorophosphate, lithium perchlorate, lithium tetrafluoroborate, lithium bisoxalato borate, lithium difluoro bisoxalato borate, lithium difluorophosphate and lithium bistrifluoromethane sulfonyl imide.
7. The electrolyte for improving the high-temperature and high-voltage cycling stability of the lithium-rich electrode material according to claim 6, wherein the electrolyte solvent is composed of a chain carbonate and a cyclic carbonate solvent; the electrolyte solute is lithium hexafluorophosphate.
8. The electrolyte for improving the high-temperature and high-voltage cycling stability of the lithium-rich electrode material according to claim 6, wherein the chain carbonate solvent is at least one of dimethyl carbonate, ethylmethyl carbonate and diethyl carbonate.
9. The electrolyte for improving the high-temperature and high-voltage cycle stability of a lithium-rich electrode material according to claim 6, wherein the cyclic carbonate-based solvent is at least one of ethylene carbonate, fluoroethylene carbonate, propylene carbonate and γ -butyrolactone.
10. The electrolyte for improving the high-temperature and high-voltage cycling stability of a lithium-rich electrode material according to claim 6, wherein the carboxylic acid ester solvent is at least one of methyl formate, ethyl acetate, ethyl butyrate and methyl acetate.
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| CN111668481A (en) * | 2020-05-27 | 2020-09-15 | 北京科技大学 | Preparation method of metal aluminum secondary battery with multi-group organic micromolecules as positive electrode |
| CN112708155A (en) * | 2020-12-11 | 2021-04-27 | 大连理工大学 | Cyano structure side chain-based sulfonated polyarylether ion exchange membrane and preparation method thereof |
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