CN111276743A - High-voltage lithium ion battery non-aqueous electrolyte and lithium ion battery thereof - Google Patents
High-voltage lithium ion battery non-aqueous electrolyte and lithium ion battery thereof Download PDFInfo
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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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
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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
- H01M10/42—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
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- 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 discloses a high-voltage lithium ion battery non-aqueous electrolyte, which comprises lithium salt, an organic solvent and an additive, wherein the additive comprises the following components in percentage by mass in the high-voltage lithium ion battery non-aqueous electrolyte: 1-5% of fluoroether additive and 5-15% of functional additive. The invention also provides a lithium ion battery containing the high-voltage lithium ion battery non-aqueous electrolyte. The non-aqueous electrolyte of the high-voltage lithium ion battery disclosed by the invention has the advantages that through optimizing the formula, the non-aqueous electrolyte of the high-voltage lithium ion battery contains the mixed lithium salt consisting of the three lithium salts and the unique combined additive, the thermal stability of the electrolyte is improved, the high-temperature storage and high-temperature cycle performance of the electrolyte are obviously improved, the oxidation of the electrolyte on the surface of a cathode and the decomposition of the electrolyte can be effectively prevented under the low-temperature and normal-temperature environments, the low-temperature performance and the cycle life of the lithium ion battery are improved, and in addition, the wettability.
Description
Technical Field
The invention relates to the field of batteries, in particular to a high-voltage lithium ion battery non-aqueous electrolyte and a lithium ion battery thereof.
Background
In recent years, the development of lithium ion batteries has attracted much attention, and the lithium ion batteries are rapidly developed in the fields of mobile phone digital code, electric automobiles, electric bicycles, electric tools, energy storage and the like. Compared with other batteries, the lithium ion battery has the advantages of light weight, small volume, high energy density, long cycle life and the like, at present, the requirements of digital products such as smart phones, tablet computers and the like on the energy density are higher and higher, so that the commercial lithium ion battery is difficult to meet the requirements, and the lithium ion battery is the most effective way for improving the energy density of the lithium ion battery by using a material with high energy density as the anode of the battery.
The conventional electrolyte is generally decomposed when the operating voltage is too high, because common organic carbonate solvents, such as chain carbonate DMC (dimethyl carbonate), EMC (ethyl methyl carbonate), DEC (diethyl carbonate), and cyclic carbonate PC (propylene carbonate), EC (ethylene carbonate), etc., cannot exist stably at high voltage. Because of their low oxidation potential, oxidative decomposition occurs at high voltages, which can degrade lithium ion battery performance. Conventional electrolytes have failed to meet the demand of high voltage lithium ion batteries, and therefore, it is important to develop a high voltage electrolyte. In addition, the current electronic products are sometimes required to be used under extreme conditions (such as high-temperature or low-temperature environments), and compared with the conventional environment, the performance of the lithium ion battery is obviously deteriorated when the lithium ion battery is used under the extreme conditions. On the other hand, since the cathode of the lithium ion battery uses a cathode active material of high potential and the anode uses an anode active material of low potential, the potential window of the electrolyte is narrower than that of the active material. The electrolyte is exposed on the surfaces of the cathode and the anode electrodes and is easy to decompose. Meanwhile, when used in an electric vehicle or a power storage device, the lithium ion battery is easily exposed to a high-temperature environment. In addition, the temperature of the battery may also increase due to instantaneous charging and current changes. Therefore, in a high-temperature environment, the service life of the battery is reduced, and the storable energy is also reduced. On the other hand, LiPF, a main salt of a lithium ion battery6Easily decomposed at high temperature or under the action of trace water to generate HF, destroy SEI film and corrode electrode material, release transition metal ions,further promoting the decomposition of the electrolyte to form a vicious circle, resulting in the deterioration of the performance of the lithium ion battery.
Disclosure of Invention
The invention aims to provide a high-voltage lithium ion battery non-aqueous electrolyte and a lithium ion battery thereof aiming at the defects of the prior art. The high-voltage lithium ion battery non-aqueous electrolyte disclosed by the invention contains the mixed lithium salt consisting of the three lithium salts and the unique combined additive by optimizing the formula, so that the thermal stability of the electrolyte is improved, the high-temperature storage and high-temperature cycle performance of the electrolyte are obviously improved, the oxidation of the electrolyte on the surface of a cathode and the decomposition of the electrolyte can be effectively prevented under low-temperature and normal-temperature environments, and the wettability, the low-temperature performance and the cycle life of the lithium ion battery are improved.
In order to achieve the purpose, the invention adopts the technical scheme that: the high-voltage lithium ion battery non-aqueous electrolyte comprises a lithium salt, an organic solvent and an additive, wherein the additive comprises the following components in percentage by mass in the high-voltage lithium ion battery non-aqueous electrolyte:
fluoroether additive 1-5%
5 to 15 percent of functional additive
As a preferred embodiment of the present invention, the fluoroether additive has the following structural formula:
wherein, Y1、Y2Each represents a hydrocarbon group having 1 to 6 carbon atoms in which part or all of the hydrogen atoms are replaced with fluorine. The fluoroether additive is more preferably 1- (2,2, 2-trifluoroethoxy) -1,1,2,3, 3-hexafluoropropane, 3- (1,1,2, 2-tetrafluoroethane) -1,1,2, 2-pentafluoropropane, 1- (2, 2-difluoroethoxy) -1,1,2,3,3, 3-hexafluoropropane, 1- (difluoromethoxy) -1,1,2,3, 3-hexafluoropropane, 1,1,2, 2-tetrafluoro-3- (perfluorooctanesulfonic acid) propane, 3- (2,2, 2-trifluoroethoxy) -1,1,1,2,2, 3-hexafluoropropane, 3- (1,2,2, 2-tetrafluoroethoxy) -1,1,2, 2-tetrafluoropropane, 3- (1,1,2, 2-tetrafluoroethoxy) -1,1,2, 2-tetrafluoropropane, 1- (1,1,2, 2-tetrafluoroethoxy) -1,1,2,2,3, 3-hexafluoropropane, 3- (1,2, 2-trifluoroethoxy) -1,1,2, 2-tetrafluoropropane, 1- (1,1,2, 2-tetrafluoroethoxy) -1,1,3, 3-tetrafluoropropane and 3- (1,1,2, 2-tetrafluoroethoxy) -1,1, 2-trifluoropropane.
Wherein: the structural formula of the 1- (2,2, 2-trifluoroethoxy) -1,1,2,3, 3-hexafluoropropane is shown as (1); the structural formula of the 3- (1,1,2, 2-tetrafluoroethane) -1,1,2, 2-pentafluoropropane is shown as (2); the structural formula of the 1- (2, 2-difluoroethoxy) -1,1,2,3,3, 3-hexafluoropropane is shown as the formula (3); the structural formula of the 1- (difluoromethoxy) -1,1,2,3, 3-hexafluoropropane is shown as (4); the structural formula of the 1,1,2, 2-tetrafluoro-3- (perfluorooctane sulfonate) propane is shown as (5); the structural formula of the 3- (2,2, 2-trifluoroethoxy) -1,1,1,2,2, 3-hexafluoropropane is shown as (6); the structural formula of the 3- (1,2,2, 2-tetrafluoroethoxy) -1,1,2, 2-tetrafluoropropane is shown as (7); the structural formula of the 3- (1,1,2, 2-tetrafluoroethoxy) -1,1,2, 2-tetrafluoropropane is shown as (8); the structural formula of the 1- (1,1,2, 2-tetrafluoroethoxy) -1,1,2,2,3, 3-hexafluoropropane is shown as (9); the structural formula of the 3- (1,2, 2-trifluoroethoxy) -1,1,2, 2-tetrafluoropropane is shown as (10); the structural formula of the 1- (1,1,2, 2-tetrafluoroethoxy) -1,1,3, 3-tetrafluoropropane is shown as (11); the structural formula of the 3- (1,1,2, 2-tetrafluoroethoxy) -1,1, 2-trifluoropropane is shown as (12).
As a preferred embodiment of the present invention, the functional additive is selected from the group consisting of fluoroethylene carbonate (FEC), 1, 3-Propane Sultone (PS), ethylene carbonate (VEC), Vinylene Carbonate (VC), Propylene Carbonate (PC), lithium difluorophosphate (LiPO)2F2) One or more of (a).
As a preferred embodiment of the present invention, the functional additive is selected from the group consisting of fluoroethylene carbonate, a mixture of 1, 3-propane sultone and vinylene carbonate.
In a preferred embodiment of the present invention, the concentration of the lithium salt in the non-aqueous electrolyte of the high-voltage lithium ion battery is 1.3 mol/L.
In a preferred embodiment of the present invention, the lithium salt is LiPF6、LiBF4And a mixture of LiDFOB and LiDFOB,LiBF in said mixture4And the mass percentage content of LiDFOB is 5-20% of the total mass of the mixture.
In the present invention, the organic solvent may be one or more selected from chain carbonates, cyclic carbonates, carboxylic acid esters, and fluoroether organic solvents. As a preferred embodiment of the present invention, the organic solvent is preferably one or more of dimethyl carbonate (DMC), diethyl carbonate (DEC), Ethyl Methyl Carbonate (EMC), dipropyl carbonate (DPC), Ethylene Carbonate (EC), Vinylene Carbonate (VC), Propylene Carbonate (PC), Ethyl Acetate (EA), Ethyl Propionate (EP), Methyl Acetate (MA), propyl acetate (PE), Methyl Propionate (MP), Methyl Butyrate (MB), Ethyl Butyrate (EB). The organic solvent is more preferably a mixture of diethyl carbonate (DEC), Ethyl Methyl Carbonate (EMC) and Ethylene Carbonate (EC).
The present invention also provides a lithium ion battery containing the high-voltage lithium ion battery nonaqueous electrolyte solution according to any one of claims 1 to 9.
Preferably, the preparation method of the lithium ion battery comprises the step of injecting the high-voltage lithium ion battery nonaqueous electrolyte solution into a fully dried nickel: cobalt: the Nickel Cobalt Manganese (NCM)/graphite soft package battery with manganese being 6:2:2 is subjected to the working procedures of standing at 45 ℃, high-temperature clamp formation and secondary sealing.
Compared with the prior art, the invention has the advantages that:
1. the non-aqueous electrolyte of the high-voltage lithium ion battery contains the mixed lithium salt consisting of the three lithium salts and the unique combined additive, can effectively form a film on the negative electrode of the battery, inhibits the decomposition of the electrolyte, improves the cycle performance and the discharge performance, and prevents the decomposition of the battery electrolyte on the surface of the negative electrode and the oxidation of the electrolyte under a high-temperature environment.
2. The non-aqueous electrolyte of the high-voltage lithium ion battery contains the fluoroether additive, fluorine has strong electronegativity and weak polarity, and the fluoroether compound has the advantages of low melting point, high flash point, high oxidative decomposition voltage and the like, and has good effect on improving the stable working capacity of the electrolyte under high voltage.
3. The non-aqueous electrolyte of the high-voltage lithium ion battery contains the fluoroether additive, and the fluoroether additive has high flash point performance, so that the safety performance of the electrolyte is obviously improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It is to be understood that the following description is only illustrative of the present invention and is not to be construed as limiting the present invention.
The fluoroether additives of the examples and comparative examples are characterized by the following structural formula:
the compound (1) is 1- (2,2, 2-trifluoroethoxy) -1,1,2,3, 3-hexafluoropropane, and has the following structural formula:
the compound (5) is 1,1,2, 2-tetrafluoro-3- (perfluorooctanesulfonic acid) propane, and has the following structural formula:
the compound (9) is 1- (1,1,2, 2-tetrafluoroethoxy) -1,1,2,2,3, 3-hexafluoropropane, and has the following structural formula:
the compound (12) is 3- (1,1,2, 2-tetrafluoroethoxy) -1,1, 2-trifluoropropane, and has the following structural formula:
example 1
The non-aqueous electrolyte is prepared by the following method: in a glove box, Ethylene Carbonate (EC), diethyl carbonate (DEC) and Ethyl Methyl Carbonate (EMC) are mixed according to the weight ratio of 1:1:1, and then a mixed lithium salt (the mass ratio is LiPF)6:LiDFOB:LiBF40.95:0.0375:0.0125) to prepare a solution containing a mixed lithium salt. Then, Vinylene Carbonate (VC), fluoroethylene carbonate (FEC), 1, 3-Propane Sultone (PS), and compound (1) were added to the solution containing the mixed lithium salt, and the mixture was stirred uniformly to obtain a nonaqueous electrolytic solution of example 1. The concentration of the mixed lithium salt in the electrolyte was 1.3M, the mass percentage of Vinylene Carbonate (VC) in the electrolyte was 0.5%, the mass percentage of fluoroethylene carbonate (FEC) in the electrolyte was 5%, the mass percentage of 1, 3-Propane Sultone (PS) in the electrolyte was 4%, and the mass percentage of compound (1) in the electrolyte was 1%.
Examples 2 to 12
Examples 2-12 are also specific examples of electrolyte preparation, and the parameters and preparation method are the same as in example 1, except for the parameters in Table 1. The electrolyte formulation is shown in table 1.
Comparative examples 1 to 8
Comparative examples 1-8 were prepared according to the same procedure as in example 1, except for the parameters shown in Table 1. The electrolyte formulation is shown in table 1.
TABLE 1 electrolyte formulations for the examples and comparative examples
Note: the concentration of the lithium salt is the molar concentration in the electrolyte;
the content of each component in the fluoroether additive and the functional additive is the mass percentage content in the electrolyte;
the proportion of each component in the solvent is weight ratio.
Lithium ion battery performance testing
Preparing a lithium ion battery:
the nonaqueous electrolytic solutions prepared in the examples and comparative examples were injected into a fully dried 4.4V nickel: cobalt: and (3) a nickel-cobalt-manganese (NCM)/graphite soft package battery with manganese being 6:2:2 is subjected to the working procedures of standing at 45 ℃, high-temperature clamp formation and secondary sealing to obtain the lithium ion battery. The cell performance tests were performed and the results are shown in table 2.
Wherein:
1. normal temperature cycle performance
Under the condition of normal temperature (25 ℃), the lithium ion battery is charged to 4.4V under the constant current and the constant voltage of 1C, and then is discharged to 3.0V under the constant current of 1C. After 500 cycles of charge and discharge, capacity retention rate after 500 cycles was calculated:
×100％
2. high temperature cycle performance
Under the condition of high temperature (45 ℃), the lithium ion battery is charged to 4.4V under the constant current and the constant voltage of 1C, and then is discharged to 3.0V under the constant current of 1C. After 500 cycles of charge and discharge, capacity retention rate after 500 cycles was calculated:
×100％
3. high temperature storage Properties
The lithium ion battery was subjected to primary 1C/1C charging and discharging (discharge capacity is designated DC) at room temperature (25 ℃ C.)0) Then charging the battery to 4.4V under the condition of 1C constant current and constant voltage; the lithium ion battery is stored in a high-temperature box at 60 ℃ for 1 month, and after being taken out, 1C discharge (the discharge capacity is recorded as DC) is carried out at normal temperature1) (ii) a Then, 1C/1C charging and discharging (discharge capacity is designated as DC) were carried out under ambient conditions2) Calculating the capacity retention rate and the capacity recovery rate of the lithium ion battery by using the following formulas:
4. low temperature cycle performance
Under the condition of low temperature (0 ℃), the lithium ion battery is charged to 4.4V under the constant current and the constant voltage of 1C, and then is discharged to 3.0V under the constant current of 1C. After 100 cycles of charge and discharge, the capacity retention rate after the 100 th cycle was calculated as:
table 2 results of performance test of lithium ion batteries of comparative examples and examples
The battery using the fluoroether additive and the lithium hexafluorophosphate also shows unusual performance in the aspects of normal-temperature circulation, high-temperature circulation and high-temperature storage, the capacity retention rate is about 80 percent after the battery is circulated for 500 times at normal temperature (25 ℃) at 1C, and the capacity retention rate is over 70 percent after the battery is circulated for 500 times at high temperature (45 ℃), but the battery shows poor performance in the aspects of low-temperature (0 ℃) circulation and low-temperature (-20 ℃)0.5C discharge, and the capacity retention rate is only about 50 percent after the battery is circulated for 100 times at low temperature (0 ℃) at 1C. After the fluoroether additive and the tri-salt system are matched for use, the battery can show good effect, after the battery is cycled for 500 times at normal temperature (25 ℃) for 1C, the battery with the fluoroether and the tri-salt system is simultaneously added, the capacity retention rate is over 80 percent, after the battery is cycled for 500 times at high temperature (45 ℃), the capacity retention rate is about 75 percent, and in the aspect of low-temperature (0 ℃) cycle 1C discharge, the battery with the fluoroether additive and the tri-salt system is simultaneously added, so that better performance is obviously shown, because the fluoroether additive has an effect of improving the high-temperature performance of the battery, but does not help the low-temperature performance of the battery; as can be seen from the above data, it can be seen that the batteries using the fluoroether-based additives can exhibit good effects in normal-temperature and high-temperature cycles, particularly in high-temperature, without much change in the addition of the tri-salt system, compared to the comparative examples 1 to 4, and the high-temperature performance of the batteries is improved after the addition of the fluoroether-based additives.
Lithium salt systems with different proportions are respectively added in the embodiments 1 to 12, and after the lithium salt of the three-salt system is introduced into the electrolyte, the low-temperature and normal-temperature performances of the obtained lithium ion battery are obviously improved; in terms of normal temperature and low temperature cycle, when LiBF is contained in lithium salt4When the total addition amount of LiDFOB is within 20% of the total mass of the lithium salt mixture, the cycle performance tends to be improved with the increase of the addition amount of the LiDFOB, so that LiBF can be seen4The total addition amount of LiDFOB is preferably 5-20% (e.g. 15%) of the total mass of the lithium salt mixture, and if too small, the effect of improving the cycle performance at room temperature may not be obtained, and if too large, the internal resistance of the battery may increase. The introduced double-salt or triple-salt system can effectively form a film on the negative electrode of the battery, inhibit the decomposition of electrolyte and improve the cycle performance and the discharge performance, and compared with the traditional lithium ion secondary battery without the combined lithium salt system, the service life of the battery can be effectively prolonged, and the storage capacity of the battery under the low-temperature and normal-temperature environments can be improved.
It will be understood by those skilled in the art that the foregoing is only exemplary of the present invention, and is not intended to limit the invention, which is intended to cover any variations, equivalents, or improvements therein, which fall within the spirit and scope of the invention.
Claims (10)
1. The high-voltage lithium ion battery non-aqueous electrolyte comprises a lithium salt, an organic solvent and an additive, and is characterized in that the additive comprises the following components in percentage by mass in the high-voltage lithium ion battery non-aqueous electrolyte:
fluoroether additive 1-5%
5-15% of functional additive.
2. The nonaqueous electrolyte solution for a high-voltage lithium ion battery of claim 1, wherein the fluoroether additive has a structural formula shown below:
wherein, Y1、Y2Each representing part or all of the hydrogen replaced by fluorine
A substituted hydrocarbon group having 1 to 6 carbon atoms.
3. The nonaqueous electrolyte solution for high-voltage lithium ion batteries according to claim 2, wherein the fluoroether additive is selected from the group consisting of 1- (2,2, 2-trifluoroethoxy) -1,1,2,3, 3-hexafluoropropane, 3- (1,1,2, 2-tetrafluoroethane) -1,1,2, 2-pentafluoropropane, 1- (2, 2-difluoroethoxy) -1,1,2,3,3, 3-hexafluoropropane, 1- (difluoromethoxy) -1,1,2,3, 3-hexafluoropropane, 1,1,2, 2-tetrafluoro-3- (perfluorooctanesulfonic acid) propane, 3- (2,2, 2-trifluoroethoxy) -1,1,1,2,2, 3-hexafluoropropane, 3- (1,2,2, 2-tetrafluoroethoxy) -1,1,2, 2-tetrafluoropropane, 3- (1,1,2, 2-tetrafluoroethoxy) -1,1,2, 2-tetrafluoropropane, 1- (1,1,2, 2-tetrafluoroethoxy) -1,1,2,2,3, 3-hexafluoropropane, 3- (1,2, 2-trifluoroethoxy) -1,1,2, 2-tetrafluoropropane, 1- (1,1,2, 2-tetrafluoroethoxy) -1,1,3, 3-tetrafluoropropane, 3- (1,1,2, 2-tetrafluoroethoxy) -1,1, 2-trifluoropropane.
4. The non-aqueous electrolyte solution for the high-voltage lithium ion battery of claim 1, wherein the functional additive is one or more selected from fluoroethylene carbonate, 1, 3-propane sultone, ethylene carbonate, vinylene carbonate, propylene carbonate, and lithium difluorophosphate.
5. The non-aqueous electrolyte for high-voltage lithium ion batteries according to claim 4, wherein said functional additive is selected from the group consisting of fluoroethylene carbonate, a mixture of 1, 3-propane sultone and vinylene carbonate.
6. The non-aqueous electrolyte solution for a high-voltage lithium ion battery according to claim 1, wherein the concentration of the lithium salt in the non-aqueous electrolyte solution for a high-voltage lithium ion battery is 1.3 mol/L.
7. The nonaqueous electrolyte solution for a high-voltage lithium ion battery according to claim 1, wherein the lithium salt is LiPF6、LiBF4And LiDFOB, LiBF in said mixture4And the mass percentage content of LiDFOB is 5-20% of the total mass of the mixture.
8. The non-aqueous electrolyte solution for the high-voltage lithium ion battery according to claim 1, wherein the organic solvent is one or more selected from dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, dipropyl carbonate, ethylene carbonate, vinylene carbonate, propylene carbonate, ethyl acetate, ethyl propionate, methyl acetate, propyl acetate, methyl propionate, methyl butyrate and ethyl butyrate.
9. The nonaqueous electrolyte solution for a high-voltage lithium-ion battery of claim 8, wherein the organic solvent is selected from a mixture of diethyl carbonate, ethyl methyl carbonate, and ethylene carbonate.
10. A lithium ion battery comprising the high-voltage lithium ion battery nonaqueous electrolyte solution according to any one of claims 1 to 9.
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| CN112421113A (en) * | 2020-11-19 | 2021-02-26 | 国联汽车动力电池研究院有限责任公司 | Electrolyte and application thereof |
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| CN114520369A (en) * | 2022-02-18 | 2022-05-20 | 湖北亿纬动力有限公司 | Electrolyte of high-voltage system, preparation method and lithium ion battery containing electrolyte |
| CN115347235A (en) * | 2022-07-25 | 2022-11-15 | 中南大学 | Sodium ion battery electrolyte and high-rate and stable-circulation sodium ion battery |
| CN116259846A (en) * | 2023-04-11 | 2023-06-13 | 湖北亿纬动力有限公司 | Lithium ion battery electrolyte and lithium ion battery |
| CN116454392A (en) * | 2023-06-16 | 2023-07-18 | 广州天赐高新材料股份有限公司 | Lithium ion secondary battery electrolyte and lithium ion secondary battery |
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