CN111082142A - High-power and high-voltage-resistant lithium ion battery electrolyte and preparation method thereof - Google Patents
High-power and high-voltage-resistant lithium ion battery electrolyte and preparation method thereof Download PDFInfo
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- CN111082142A CN111082142A CN201911324997.5A CN201911324997A CN111082142A CN 111082142 A CN111082142 A CN 111082142A CN 201911324997 A CN201911324997 A CN 201911324997A CN 111082142 A CN111082142 A CN 111082142A
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 64
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000011356 non-aqueous organic solvent Substances 0.000 claims abstract description 28
- 239000013538 functional additive Substances 0.000 claims abstract description 20
- -1 lithium hexafluorophosphate Chemical group 0.000 claims abstract description 19
- 229910003002 lithium salt Inorganic materials 0.000 claims abstract description 16
- 159000000002 lithium salts Chemical class 0.000 claims abstract description 16
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 claims abstract description 13
- DSMUTQTWFHVVGQ-UHFFFAOYSA-N 4,5-difluoro-1,3-dioxolan-2-one Chemical compound FC1OC(=O)OC1F DSMUTQTWFHVVGQ-UHFFFAOYSA-N 0.000 claims abstract description 13
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims abstract description 13
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims abstract description 13
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 229910021385 hard carbon Inorganic materials 0.000 claims description 5
- 229910052744 lithium Inorganic materials 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000011261 inert gas Substances 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 11
- 239000000654 additive Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 206010016766 flatulence Diseases 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 150000003457 sulfones Chemical class 0.000 description 1
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Classifications
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- 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
- H01M10/0568—Liquid materials characterised by the solutes
-
- 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
- H01M10/0569—Liquid materials characterised by the solvents
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
- H01M2300/0028—Organic electrolyte characterised by the solvent
- H01M2300/0037—Mixture of solvents
- H01M2300/004—Three solvents
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0088—Composites
- H01M2300/0091—Composites in the form of mixtures
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention belongs to the technical field of lithium ion battery electrolyte, and particularly relates to high-power and high-voltage-resistant lithium ion battery electrolyte and a preparation method thereof. The electrolyte consists of the following raw materials in percentage by mass: 77-84% of nonaqueous organic solvent, 14-18% of lithium salt and 2-5% of film-forming functional additive; the non-aqueous organic solvent comprises ethylene carbonate, methyl ethyl carbonate and dimethyl carbonate; the lithium salt is lithium hexafluorophosphate; the molar concentration of the lithium hexafluorophosphate is 1.1-1.3M; the film-forming functional additive comprises vinylene carbonate and difluoroethylene carbonate. In an inert gas environment, configuring the electrolyte into an electrolyte; according to the invention, the nonaqueous organic solvent, the lithium salt and the film-forming functional additive are adopted in a proper proportion, so that the electrolyte has higher voltage tolerance, better charge and discharge performance and good cycle stability, and a battery containing the electrolyte can have good electrochemical performance under high voltage.
Description
Technical Field
The invention belongs to the technical field of lithium ion battery electrolyte, and particularly relates to high-power and high-voltage-resistant lithium ion battery electrolyte and a preparation method thereof.
Background
Compared with the traditional lead-acid battery, nickel-cadmium battery and other systems, the lithium ion battery has the advantages of high voltage, high energy density, good cycle stability, no memory effect and the like, is rapidly developed in recent years, and the application of the lithium ion battery is also expanded to the fields of electronic products, transportation, energy storage devices and the like. With the continuous improvement of the requirements of the application end on the performance of the power supply, the requirements on the energy density and the power density of the lithium ion battery are increased sharply day by day, which puts higher and higher requirements on the electrolyte of the lithium ion battery: in addition to being able to withstand high voltages (4.35V, 4.4V, 4.45V, 4.5V and even higher), it is also required to have a sufficiently high conductivity. To meet these two requirements, careful design and control of the composition and proportion of the electrolyte are required.
At present, the conductivity of the conventional carbonate and lithium hexafluorophosphate system electrolyte is about 10mS/cm, the rate performance is general, and the conventional carbonate and lithium hexafluorophosphate system electrolyte is rapidly decomposed when the voltage exceeds 4.5V, and the performance of the battery is rapidly reduced, so that the demand of the high-power and high-voltage resistant electrolyte is particularly urgent.
The idea of preparing the high-power and high-voltage resistant electrolyte mainly comprises the following aspects: selecting solvents with higher oxidation potential and wider electrochemical window, such as sulfones, nitriles, fluoro solvents and the like; some electrode protection additives are added to improve the interfacial properties of the electrode material; adding an electrode film forming additive to inhibit the reaction between the electrolyte and the interface of the electrode material; using a novel high voltage resistant lithium salt as an additive; the concentration of lithium salt is properly increased to eliminate concentration polarization and enhance the rate performance; meanwhile, the components and the proportion of the solvent and the additive are accurately regulated and controlled to maintain higher conductivity.
From the application point of view, the economic benefits of high-power and high-voltage-resistant batteries and other factors are also comprehensively considered, so that the appropriate lithium salt, solvent system and functional additive are required to be designed and developed to improve the electrochemical properties of the electrolyte, such as power performance, high-voltage resistance and the like.
Disclosure of Invention
Therefore, in view of the above technical problems in the prior art, an object of the present invention is to provide a high-power and high-voltage resistant lithium ion battery electrolyte and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following specific technical scheme:
the high-power and high-voltage-resistant lithium ion battery electrolyte is composed of the following raw materials in percentage by mass: 77-84% of nonaqueous organic solvent, 14-18% of lithium salt and 2-5% of film-forming functional additive;
wherein the non-aqueous organic solvent comprises ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate; according to the volume ratio, the ethylene carbonate accounts for 4-6 parts in the non-aqueous organic solvent, and the methyl ethyl carbonate accounts for 2-3 parts; 1-2 parts of dimethyl carbonate;
the lithium salt is lithium hexafluorophosphate; the molar concentration of the lithium hexafluorophosphate is 1.1-1.3M;
the film-forming functional additive comprises vinylene carbonate and difluoroethylene carbonate, wherein the vinylene carbonate accounts for 1-2 parts by mass, and the difluoroethylene carbonate accounts for 10 parts by mass.
Further, the conductivity of the electrolyte is 9.5-10.5 mS/cm.
Further, the invention discloses a high-power and high-voltage-resistant lithium ion battery electrolyte, which comprises the following steps:
in an inert environment filled with argon, adding ethylene carbonate, methyl ethyl carbonate and dimethyl carbonate into a container respectively to prepare a mixed non-aqueous organic solvent; and dissolving lithium hexafluorophosphate in the mixed non-aqueous organic solvent, adding film-forming functional additives of vinylene carbonate and difluoroethylene carbonate to prepare electrolyte, sealing and storing the prepared electrolyte, and standing for 24 hours.
The invention further discloses a preparation method of the battery, which comprises the steps of firstly preparing the soft package battery cell with the positive electrode being high-voltage lithium cobaltate, the negative electrode being graphite and hard carbon and the capacity being 190mAh, and then injecting the electrolyte prepared by the preparation method into the soft package battery cell to prepare the finished battery.
The invention has the advantages and positive effects that:
according to the high-power and high-voltage-resistant lithium ion battery electrolyte provided by the invention, the nonaqueous organic solvent, the lithium salt and the film-forming functional additive are adopted in a proper proportion, so that the electrolyte has a high-power characteristic, high-voltage tolerance, good charge and discharge performance and good cycle stability, and a battery containing the electrolyte can be charged and discharged at a high rate under a high voltage and has good electrochemical performance.
Drawings
Fig. 1 is a voltage-rise cycle capacity variation graph of the high-power and high-voltage resistant lithium ion battery electrolyte obtained in example 1 of the present invention;
fig. 2 is a graph comparing the high voltage cycling capacity variation curves of the high power and high voltage resistant lithium ion battery electrolyte and the commercial electrolyte obtained in example 2 of the present invention;
fig. 3 is a comparison graph of the high-voltage cyclic internal resistance variation curves of the high-power and high-voltage resistant lithium ion battery electrolyte and the commercial electrolyte obtained in embodiment 3 of the present invention.
Detailed Description
For a further understanding of the contents, features and effects of the present invention, the following examples are illustrated in the accompanying drawings and described in the following detailed description:
the invention discloses a high-power and high-voltage-resistant lithium ion battery electrolyte, which is prepared from the following raw materials in percentage by mass: 77-84% of nonaqueous organic solvent, 14-18% of lithium salt and 2-5% of film-forming functional additive;
wherein the non-aqueous organic solvent comprises ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate; according to the volume ratio, the ethylene carbonate accounts for 4-6 parts in the non-aqueous organic solvent, and the methyl ethyl carbonate accounts for 2-3 parts; 1-2 parts of dimethyl carbonate.
The lithium salt is lithium hexafluorophosphate; the molar concentration of the lithium hexafluorophosphate is 1.1-1.3M.
The film-forming functional additive comprises vinylene carbonate and difluoroethylene carbonate, wherein the vinylene carbonate accounts for 1-2 parts by mass, and the difluoroethylene carbonate accounts for 10 parts by mass.
The conductivity of the electrolyte is 9.5-10.5 mS/cm.
The invention discloses a preparation method of a high-voltage lithium ion battery electrolyte, which comprises the following steps:
in an inert environment filled with argon, adding ethylene carbonate, methyl ethyl carbonate and dimethyl carbonate into a container respectively to prepare a mixed non-aqueous organic solvent; and dissolving lithium hexafluorophosphate in the mixed non-aqueous organic solvent, adding film-forming functional additives of vinylene carbonate and difluoroethylene carbonate to prepare electrolyte, sealing and storing the prepared electrolyte, and standing for 24 hours.
The preparation process according to the invention is described in detail below by means of 3 examples:
example 1
In an inert environment filled with argon, adding ethylene carbonate, methyl ethyl carbonate and dimethyl carbonate into a container according to the volume ratio of 4:2:1 to prepare a mixed non-aqueous organic solvent, then dissolving lithium hexafluorophosphate into the mixed non-aqueous organic solvent, then adding film-forming functional additives of vinylene carbonate and difluoroethylene carbonate according to the mass ratio of 1:10 to prepare an electrolyte containing 1.1M lithium hexafluorophosphate, wherein the mass percentages of the raw materials are as follows: 84% of nonaqueous organic solvent, 14% of lithium salt and 2% of film-forming functional additive, and finally sealing and storing the prepared electrolyte for 24 h. The conductivity of the electrolyte was 9.5 mS/cm.
Preparing a soft package battery core with a high-voltage lithium cobaltate positive electrode, graphite and hard carbon negative electrode and 190mAh capacity for testing, injecting the prepared electrolyte into the soft package battery core to prepare a finished battery, standing for 24 hours, forming with 0.1C low current, then carrying out 5C charge-discharge cycle testing, wherein the initial voltage is 4.4V, the voltage is increased by 0.05V after 5 cycles until 4.5V, the testing temperature is 25 ℃, and monitoring the capacity change in the voltage-increase cycle process.
As shown in FIG. 1, when the initial voltage is 4.4V, the initial capacity of the battery is 190mAh, the capacity of the battery is steadily increased along with the increase of the voltage, and when the voltage is 4.5V, the capacity of the battery reaches 208mAh, the increase is 9.5%, which shows that the performance of the electrolyte is stable in the process of increasing the voltage to 4.5V.
Example 2
In an inert environment filled with argon, adding ethylene carbonate, methyl ethyl carbonate and dimethyl carbonate into a container according to the volume ratio of 6:3:2 to prepare a mixed non-aqueous organic solvent, then dissolving lithium hexafluorophosphate into the mixed non-aqueous organic solvent, then adding a film-forming functional additive of vinylene carbonate and difluoroethylene carbonate according to the mass ratio of 3:20 to prepare an electrolyte containing 1.2M lithium hexafluorophosphate, wherein the mass percentages of the raw materials are as follows: 80% of non-aqueous organic solvent, 16% of lithium salt and 4% of film-forming functional additive, and finally sealing and storing the prepared electrolyte for 24 h. The conductivity of the electrolyte was 10.1 mS/cm.
Preparing a soft package battery core with a positive electrode of high-voltage lithium cobaltate, a negative electrode of graphite and hard carbon and a capacity of 190mAh for testing, injecting the prepared electrolyte to prepare a finished battery, standing for 24 hours, forming with 0.1C low current, then carrying out 5C charge-discharge cycle testing, wherein the constant voltage is 4.5V, the number of cycles is 700 circles, the testing temperature is 25 ℃, and monitoring the discharge capacity change in the high-voltage cycle process.
As shown in FIG. 2, under the condition of 4.5V high voltage long cycle, the electrolyte of the invention has stable electrochemical performance and slow battery capacity decay, and the capacity retention rate still reaches more than 80% after 700 cycles, while the capacity decay of the comparative commercial electrolyte is rapid under the same test condition, and the capacity retention rate is only 52% after 700 cycles.
Example 3
In an inert environment filled with argon, adding ethylene carbonate, methyl ethyl carbonate and dimethyl carbonate into a container according to the volume ratio of 5:3:2 to prepare a mixed non-aqueous organic solvent, then dissolving lithium hexafluorophosphate into the mixed non-aqueous organic solvent, then adding a film-forming functional additive of vinylene carbonate and difluoroethylene carbonate according to the mass ratio of 1:5 to prepare an electrolyte containing 1.3M lithium hexafluorophosphate, wherein the mass percentages of the raw materials are as follows: 77% of nonaqueous organic solvent, 18% of lithium salt and 5% of film-forming functional additive, and finally sealing and storing the prepared electrolyte for 24 h. The conductivity of the electrolyte was 10.5 mS/cm.
Preparing a test soft package battery cell with a positive electrode of high-voltage lithium cobaltate, a negative electrode of graphite and hard carbon and a capacity of 190mAh, injecting the prepared electrolyte to prepare a finished battery, standing for 24 hours, forming at a low current of 0.1C, then carrying out 5C charge-discharge cycle test, wherein the constant voltage is 4.5V, the cycle number is 700 circles, the test temperature is 25 ℃, and monitoring internal resistance change in a high-voltage cycle process by using an internal resistance instrument.
As shown in FIG. 3, under the 4.5V high-voltage long-cycle condition, the conductivity and film-forming property of the electrolyte are stable, the internal resistance of the battery rises slowly, the internal resistance only increases by 19% after 700 cycles, and the battery has no flatulence phenomenon all the time, compared with the commercial electrolyte, the internal resistance of the battery rises rapidly under the same test condition, the internal resistance increases by 482% after 700 cycles, and the battery has the flatulence phenomenon.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (4)
1. The utility model provides a high power and high voltage resistant lithium ion battery electrolyte which characterized in that: the high-voltage lithium ion battery electrolyte is composed of the following raw materials in percentage by mass: 77-84% of nonaqueous organic solvent, 14-18% of lithium salt and 2-5% of film-forming functional additive;
wherein the non-aqueous organic solvent comprises ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate; according to the volume ratio, the ethylene carbonate accounts for 4-6 parts in the non-aqueous organic solvent, and the methyl ethyl carbonate accounts for 2-3 parts; 1-2 parts of dimethyl carbonate;
the lithium salt is lithium hexafluorophosphate; the molar concentration of the lithium hexafluorophosphate is 1.1-1.3M;
the film-forming functional additive comprises vinylene carbonate and difluoroethylene carbonate, wherein the vinylene carbonate accounts for 1-2 parts by mass, and the difluoroethylene carbonate accounts for 10 parts by mass.
2. The high power and high voltage tolerant lithium ion battery electrolyte of claim 1, wherein: the conductivity of the electrolyte is 9.5-10.5 mS/cm.
3. The method for preparing the electrolyte according to claim 1 or 2, characterized in that: comprises the following steps of (a) carrying out,
in an inert environment filled with argon, adding ethylene carbonate, methyl ethyl carbonate and dimethyl carbonate into a container respectively to prepare a mixed non-aqueous organic solvent; and dissolving lithium hexafluorophosphate in the mixed non-aqueous organic solvent, adding film-forming functional additives of vinylene carbonate and difluoroethylene carbonate to prepare electrolyte, sealing and storing the prepared electrolyte, and standing for 24 hours.
4. A method for manufacturing a battery, comprising: firstly, preparing a soft package battery cell with a high-voltage lithium cobaltate as an anode, graphite and hard carbon as a cathode and 190mAh capacity, and then injecting the electrolyte prepared by the preparation method into the soft package battery cell to prepare a finished battery.
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Application publication date: 20200428 |