CN111883834A - Non-aqueous lithium ion battery electrolyte additive, electrolyte containing non-aqueous lithium ion battery electrolyte additive and lithium ion battery - Google Patents
Non-aqueous lithium ion battery electrolyte additive, electrolyte containing non-aqueous lithium ion battery electrolyte additive and lithium ion battery Download PDFInfo
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- CN111883834A CN111883834A CN202010728346.9A CN202010728346A CN111883834A CN 111883834 A CN111883834 A CN 111883834A CN 202010728346 A CN202010728346 A CN 202010728346A CN 111883834 A CN111883834 A CN 111883834A
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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
- H01M10/05—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
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic 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 provides a nonaqueous lithium ion battery electrolyte additive, an electrolyte containing the same and a lithium ion battery. The additive enables the electrolyte to have stable performance, and effectively improves the high-temperature performance and the cycle performance of the lithium ion battery.
Description
Technical Field
The invention belongs to the technical field of battery electrolyte, and relates to a nonaqueous lithium ion battery electrolyte additive, electrolyte containing the additive and a lithium ion battery.
Background
With the development of new energy vehicles, power energy storage and high-performance digital products, people have higher requirements on the performance and the application range of batteries, and therefore lithium ion batteries which can meet the increasing demands need to be developed. However, the electrolyte is decomposed and deposited on the surface of the electrode, so that the impedance of the battery is increased, the discharge characteristic of the battery at low temperature is reduced, and the electrochemical performance of the battery is seriously deteriorated.
Although the development of additives in the prior art has enabled the electrolyte to achieve certain effects in reducing the gas production of the battery, there is still a need to develop more electrolytes that can reduce the impedance of the battery and provide good high temperature performance and cycle performance.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a nonaqueous lithium ion battery electrolyte additive, an electrolyte containing the same and a lithium ion battery. The additive can effectively prevent the decomposition of the electrolyte in the battery cycle process, and can effectively improve the high-temperature performance and cycle performance of the lithium ion battery.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, the invention provides a non-aqueous lithium ion battery electrolyte additive comprising a bipyridyl sulfonyl salt.
In the invention, the bipyridyl sulfonyl salt is used as an electrolyte additive of the non-aqueous lithium ion battery, the electrolyte acts on the negative electrode to form an SEI film with more stable performance, and simultaneously, the decomposition of an organic solvent of the electrolyte on the electrode is inhibited, and the electrode material is effectively protected, so that the click cycle performance and the high-temperature performance are improved.
In the invention, the chemical structural formula of the bipyridyl sulfonyl salt is shown as a formula I:
the synthetic route for structural formula i is as follows:
the specific synthesis steps are as follows: firstly, adding 2mol of pyridine, introducing inert gas nitrogen for protection, controlling the temperature at-40 ℃, then adding 1mol of sulfonyl fluoride for full reaction, and reacting for 4-6 hours to obtain the bipyridine sulfonyl salt.
In another aspect, the present invention provides a nonaqueous lithium ion battery electrolyte, which includes an electrolyte lithium salt, an additive and a nonaqueous organic solvent, wherein the additive is the above-mentioned nonaqueous lithium ion battery electrolyte additive.
Preferably, the mass percentage of the bipyridyl sulfonyl salt in the nonaqueous lithium ion battery electrolyte is 0.5-10%, for example, 0.5%, 0.8%, 1%, 1.5%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10%.
Preferably, the concentration of the electrolyte lithium salt in the non-aqueous lithium ion battery electrolyte is 0.1-2 mol/L, such as 0.1mol/L, 0.3mol/L, 0.5mol/L, 0.8mol/L, 1mol/L, 1.2mol/L, 1.4mol/L, 1.5mol/L, 1.7mol/L, 1.9mol/L or 2 mol/L.
Preferably, the electrolyte lithium salt is LiBF4、LiPF6、LiPF2O2、LiClO4、LiAsF6Or LiSO3CF3Any one or a combination of at least two of them may be combined in any ratio when two or more are selected.
Preferably, the non-aqueous organic solvent includes any one or a combination of at least two of Ethylene Carbonate (EC), Propylene Carbonate (PC), Butylene Carbonate (BC), diethyl carbonate (DEC), dimethyl carbonate (DMC), Ethyl Methyl Carbonate (EMC), Methyl Propyl Carbonate (MPC), 1, 4-butyrolactone (GBL), methyl acetate (EM), Ethyl Acetate (EA), propyl acetate (EM), butyl acetate (EB), methyl Propionate (PA), ethyl Propionate (PE), Propyl Propionate (PP), butyl Propionate (PB), methyl Butyrate (BA), ethyl Butyrate (BE), or propyl Butyrate (BP), and when two or more combinations are selected, they may BE combined in any ratio.
Preferably, the additive further comprises other additives besides the bipyridyl sulfonyl salt.
Preferably, the other additive is any one of Vinylene Carbonate (VC), Vinyl Ethylene Carbonate (VEC), 1, 3-Propane Sultone (PS), 1, 4-Butane Sultone (BS), vinyl sulfate (DTD), propylene sulfate, ethylene sulfate, vinyl sulfite, propylene sulfite, lithium bis (oxalato) borate (BOB), lithium bis (oxalato) borate (DFOB), or lithium bis (fluorosulfonyl) imide (FSI), or a combination of at least two thereof, and may be combined in any ratio when two or more thereof are selected.
Preferably, the other additives include a lithium salt additive which is LiBOB (bis (oxalato) borate), LiFSi (lithium difluorosulfonimide), LiODFB (lithium difluorooxalato borate), LiBF4(lithium tetrafluoroborate) LiPO2F2(lithium difluorophosphate) or LiDFOP (lithium difluorobis (oxalato) phosphate), or a combination of at least two of them.
Preferably, the content of the other additive in the nonaqueous lithium ion battery electrolyte is 0.5-10% by mass, for example, 0.5%, 0.8%, 1%, 1.5%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9% or 10%.
In another aspect, the present invention provides a lithium ion battery, including a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and an electrolyte, where the electrolyte is the above-mentioned nonaqueous lithium ion battery electrolyte.
Preferably, the positive electrode includes an active material that is LiNixCoyMnzL(1-x-y-z)O2、LiCoxL(1-x')O2、LiNix″Ly'Mn(2-x″-y')O4、Liz'MPO4At least one of; wherein L is at least one of Co, Al, Sr, Mg, Ti, Ca, Zr, Zn, Si and Fe; x is more than or equal to 0 and less than or equal to 1, y is more than or equal to 0 and less than or equal to 1, z is more than 0 and less than or equal to 1, x + y + z is more than 0 and less than or equal to 1, x 'is more than 0.3 and less than or equal to 0.6, and y' is more than 0.01 and less than or equal to 0.; l' is at least one of Co, Al, Sr, Mg, Ti, Ca, Zr, Zn, Si and Fe; z' is more than or equal to 0.5 and less than or equal to 1, and M is at least one of Fe, Mn and Co.
In the present invention, the positive electrode, the negative electrode, and the separator are not particularly limited, and any of the positive electrode, the negative electrode, and the separator that are conventional in the art can be used.
The lithium ion battery of the invention has better high-temperature cycle performance, high-temperature storage performance and normal-temperature cycle performance because of containing the non-aqueous lithium ion battery electrolyte.
Compared with the prior art, the invention has the following beneficial effects:
the non-aqueous lithium ion battery electrolyte disclosed by the invention contains the bipyridyl sulfonyl salt, so that the stability of the electrolyte is improved, the cycle performance of the battery is improved when the electrolyte is applied to the lithium ion battery, the high-temperature performance of the battery is improved, and the non-aqueous lithium ion battery electrolyte has a wide market application prospect.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a ternary NCM523 positive electrode material, an artificial graphite negative electrode, a PP diaphragm and an electrolyte, wherein the electrolyte is a non-aqueous electrolyte, the total weight of the non-aqueous electrolyte is 100%, and the artificial graphite battery comprises the components with the mass percentage content shown in the example 1 in the table 1 and 1mol of LiPF6And (3) salt.
Example 2
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a ternary NCM523 positive electrode material, an artificial graphite negative electrode, a PP diaphragm and an electrolyte, wherein the electrolyte is a non-aqueous electrolyte, the total weight of the non-aqueous electrolyte is 100%, and the artificial graphite battery comprises the components with the mass percentage content shown in the example 1 in the table 1 and 1mol of LiPF6And (3) salt.
Example 3
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a ternary NCM523 positive electrode material, an artificial graphite negative electrode, a PP diaphragm and an electrolyte, wherein the electrolyte is a non-aqueous electrolyte, the total weight of the non-aqueous electrolyte is 100%, and the artificial graphite battery comprises the components with the mass percentage content shown in the example 1 in the table 1 and 1mol of LiPF6And (3) salt.
Example 4
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a ternary NCM523 positive electrode material,the artificial graphite negative electrode comprises an artificial graphite negative electrode, a PP (polypropylene) diaphragm and an electrolyte, wherein the electrolyte is a nonaqueous electrolyte, the total weight of the nonaqueous electrolyte is 100%, and the artificial graphite negative electrode contains the components with the mass percentage content shown in the example 1 in the table 1 and 1mol of LiPF (lithium ion particle Filter)6And (3) salt.
Example 5
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a ternary NCM523 positive electrode material, an artificial graphite negative electrode, a PP diaphragm and an electrolyte, wherein the electrolyte is a non-aqueous electrolyte, the total weight of the non-aqueous electrolyte is 100%, and the artificial graphite battery comprises the components with the mass percentage content shown in the example 1 in the table 1 and 1mol of LiPF6And (3) salt.
Example 6
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a ternary NCM523 positive electrode material, an artificial graphite negative electrode, a PP diaphragm and an electrolyte, wherein the electrolyte is a non-aqueous electrolyte, the total weight of the non-aqueous electrolyte is 100%, and the artificial graphite battery comprises the components with the mass percentage content shown in the example 1 in the table 1 and 1mol of LiPF6And (3) salt.
Example 7
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a ternary NCM523 positive electrode material, an artificial graphite negative electrode, a PP diaphragm and an electrolyte, wherein the electrolyte is a non-aqueous electrolyte, the total weight of the non-aqueous electrolyte is 100%, and the artificial graphite battery comprises the components with the mass percentage content shown in the example 1 in the table 1 and 1mol of LiPF6And (3) salt.
Example 8
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a ternary NCM523 positive electrode material, an artificial graphite negative electrode, a PP diaphragm and an electrolyte, wherein the electrolyte is a non-aqueous electrolyte, the total weight of the non-aqueous electrolyte is 100%, and the artificial graphite battery comprises the components with the mass percentage content shown in the example 1 in the table 1 and 1mol of LiPF6And (3) salt.
Example 9
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a ternary NCM523 positive electrode material, an artificial graphite negative electrode, a PP diaphragm and an electrolyte, wherein the electrolyte is a non-aqueous electrolyte, the total weight of the non-aqueous electrolyte is 100%, and the artificial graphite battery comprises the components with the mass percentage content shown in the example 1 in the table 1 and 1mol of LiPF6And (3) salt.
Example 10
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a ternary NCM523 positive electrode material, an artificial graphite negative electrode, a PP diaphragm and an electrolyte, wherein the electrolyte is a non-aqueous electrolyte, the total weight of the non-aqueous electrolyte is 100%, and the artificial graphite battery comprises the components with the mass percentage content shown in the example 1 in the table 1 and 1mol of LiPF6And (3) salt.
Comparative example 1
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a ternary NCM523 positive electrode material, an artificial graphite negative electrode, a PP diaphragm and an electrolyte, wherein the electrolyte is a non-aqueous electrolyte, the total weight of the non-aqueous electrolyte is 100%, and the artificial graphite battery comprises the components with the mass percentage content shown in the example 1 in the table 1 and 1mol of LiPF6And (3) salt.
Comparative example 2
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a ternary NCM523 positive electrode material, an artificial graphite negative electrode, a PP diaphragm and an electrolyte, wherein the electrolyte is a non-aqueous electrolyte, the total weight of the non-aqueous electrolyte is 100%, and the artificial graphite battery comprises the components with the mass percentage content shown in the example 1 in the table 1 and 1mol of LiPF6And (3) salt.
Comparative example 3
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a ternary NCM523 positive electrode material, an artificial graphite negative electrode, a PP (polypropylene) diaphragm and an electrolyte, wherein the electrolyte is a nonaqueous electrolyte, and the total weight of the nonaqueous electrolyte is 100 percent and contains the components shown in the example in the table 11 and 1mol of LiPF6And (3) salt.
Comparative example 4
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a ternary NCM523 positive electrode material, an artificial graphite negative electrode, a PP diaphragm and an electrolyte, wherein the electrolyte is a non-aqueous electrolyte, the total weight of the non-aqueous electrolyte is 100%, and the artificial graphite battery comprises the components with the mass percentage content shown in the example 1 in the table 1 and 1mol of LiPF6And (3) salt.
Comparative example 5
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a ternary NCM523 positive electrode material, an artificial graphite negative electrode, a PP diaphragm and an electrolyte, wherein the electrolyte is a non-aqueous electrolyte, the total weight of the non-aqueous electrolyte is 100%, and the artificial graphite battery comprises the components with the mass percentage content shown in the example 1 in the table 1 and 1mol of LiPF6And (3) salt.
Comparative example 6
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a ternary NCM523 positive electrode material, an artificial graphite negative electrode, a PP diaphragm and an electrolyte, wherein the electrolyte is a non-aqueous electrolyte, the total weight of the non-aqueous electrolyte is 100%, and the artificial graphite battery comprises the components with the mass percentage content shown in the example 1 in the table 1 and 1mol of LiPF6And (3) salt.
Comparative example 7
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a ternary NCM523 positive electrode material, an artificial graphite negative electrode, a PP diaphragm and an electrolyte, wherein the electrolyte is a non-aqueous electrolyte, the total weight of the non-aqueous electrolyte is 100%, and the artificial graphite battery comprises the components with the mass percentage content shown in the example 1 in the table 1 and 1mol of LiPF6And (3) salt.
Comparative example 8
LiNi0.5Co0.2Mn0.3O2The artificial graphite battery comprises a ternary NCM523 positive electrode material, an artificial graphite negative electrode and a PP separatorThe electrolyte is a nonaqueous electrolyte, the total weight of the nonaqueous electrolyte is 100%, and the electrolyte contains the components with the mass percentage content shown in the example 1 in the table 1 and 1mol of LiPF6And (3) salt.
The lithium ion batteries of examples 1-10 and comparative examples 1-8 of the invention are subjected to performance tests, and the test indexes and the test method are as follows:
(1) the cycle performance is shown by testing the capacity retention rate of 1C cycle at 45 ℃ for N times, and the specific method comprises the following steps: the fabricated battery was charged to 4.35V (LiNi) at 45 ℃ with a 1C constant current and a constant voltage0.5Co0.2Mn0.3O2Artificial graphite), the off current was 0.02C, and then the discharge was made to 3.0V with a constant current of 1C. After such charge/discharge cycles, the capacity retention rate after 200 weeks' cycles was calculated to evaluate the high-temperature cycle performance thereof.
The calculation formula of the capacity retention rate after 200 cycles at 45 ℃ is as follows:
the 200 th cycle capacity retention (%) was (200 th cycle discharge capacity/1 st cycle discharge capacity) × 100%
(2) The cycle performance is shown by testing the capacity retention rate of the cycle at 25 ℃ and 1C for N times, and the specific method comprises the following steps: the battery after formation (which can be used after activation) is charged to 4.35V (LiNi) at 25 deg.C with 1C constant current and constant voltage0.5Co0.2Mn0.3O2Artificial graphite), the off current was 0.02C, and then the discharge was made to 3.0V with a constant current of 1C. After such charge/discharge cycles, the capacity retention rate after 100 th cycle was calculated to evaluate the normal temperature cycle performance.
The calculation formula of the capacity retention rate after 100 cycles at 25 ℃ is as follows:
capacity retention (%) at 100 th cycle (100 th cycle discharge capacity/1 st cycle discharge capacity) × 100%
(3) Method for testing capacity retention rate, capacity recovery rate and thickness expansion rate after 30 days of storage at 60 ℃: charging the formed battery to 4.4V (LiNi) at normal temperature by using a 1C constant current and constant voltage0.5Co0.2Mn0.3O2Artificial graphite) with cutoff current of 0.02C, and discharging with constant current of 1C until3.0V, measuring the initial discharge capacity of the battery, then charging to 4.4V with a 1C constant current and constant voltage, with a cutoff current of 0.01C, measuring the initial thickness of the battery, then storing the battery at 60 ℃ for 30 days, measuring the thickness of the battery, then discharging to 3.0V with a 1C constant current, measuring the retention capacity of the battery, then charging to 3.0V with a 1C constant current and constant voltage, with a cutoff battery of 0.02C, then discharging to 3.0V with a 1C constant current, and measuring the recovery capacity. The calculation formulas of the capacity retention rate, the capacity recovery rate and the thickness expansion are as follows:
battery capacity retention (%) retention capacity/initial capacity × 100%
Battery capacity recovery (%) -recovery capacity/initial capacity X100%
Battery thickness swelling ratio (%) (thickness after 30 days-initial thickness)/initial thickness × 100%
TABLE 1
The test results of experimental examples 1 to 10 and comparative examples 1 to 8 are shown in tables 2 and 3 below.
TABLE 2
TABLE 3
According to the results in tables 2 and 3, it can be seen that the addition of the additive for non-aqueous lithium ion battery electrolyte can make the capacity retention rate at 60 ℃ of the lithium ion battery at high temperature more than 73%, even more than 80%, the capacity recovery rate more than 79%, the thick expansion rate less than 37%, the retention rate at 100 times of normal temperature cycles more than 82%, and the retention rate at 200 times of high temperature cycles more than 70%. The comparative example, in which such an additive was not added, resulted in a significant decrease in high-temperature capacity retention rate, capacity recovery rate, and cycle performance, and a significant increase in thick expansion rate.
The applicant states that the non-aqueous lithium ion battery electrolyte additive, the electrolyte containing the same and the lithium ion battery of the present invention are illustrated by the above examples, but the present invention is not limited to the above examples, i.e. the present invention is not meant to be implemented by relying on the above examples. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. The non-aqueous lithium ion battery electrolyte additive is characterized by comprising a bipyridyl sulfonyl salt, wherein the structural formula of the bipyridyl sulfonyl salt is as follows:
2. the non-aqueous lithium ion battery electrolyte is characterized by comprising electrolyte lithium salt, an additive and a non-aqueous organic solvent, wherein the additive is the non-aqueous lithium ion battery electrolyte additive.
3. The non-aqueous lithium ion battery electrolyte according to claim 2, wherein the mass percentage of the bipyridyl sulfonyl salt in the non-aqueous lithium ion battery electrolyte is 0.5-10%.
4. The non-aqueous lithium ion battery electrolyte according to claim 2 or 3, wherein the concentration of the electrolyte lithium salt in the non-aqueous lithium ion battery electrolyte is 0.1-2 mol/L.
5. The non-aqueous lithium ion battery electrolyte of any of claims 2-4 wherein the electrolyte lithium salt is LiBF4、LiPF6、LiPF2O2、LiClO4、LiAsF6Or LiSO3CF3Any one or a combination of at least two of them.
6. The non-aqueous lithium ion battery electrolyte of any of claims 2-5, wherein the non-aqueous organic solvent comprises any one of ethylene carbonate, propylene carbonate, butylene carbonate, diethyl carbonate, dimethyl carbonate, ethyl methyl carbonate, propyl methyl carbonate, 1, 4-butyrolactone, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, propyl propionate, butyl propionate, methyl butyrate, ethyl butyrate, or propyl butyrate, or a combination of at least two thereof.
7. The non-aqueous lithium ion battery electrolyte of any of claims 2-6 wherein the additive further comprises an additive other than a bipyridylsulfonyl salt;
preferably, the other additive is any one or a combination of at least two of vinylene carbonate, ethylene carbonate, 1, 3-propane sultone, 1, 4-butane sultone, vinyl sulfate, propylene sulfate, ethylene sulfate, vinyl sulfite, propylene sulfite, lithium bis (oxalato) borate, lithium bis (oxalato) diboronate or lithium bis (fluorosulfonyl) imide.
8. The non-aqueous lithium ion battery electrolyte of any of claims 2-7, wherein the other additives comprise a lithium salt additive, the lithium salt additive being the lithium salt additiveIs LiBOB, LiFSI, LiODFB or LiBF4、LiPO2F2Or a combination of any one or at least two of LiODFP;
preferably, the mass percentage of the other additives in the nonaqueous lithium ion battery electrolyte is 0.5-10%.
9. A lithium ion battery comprising a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and an electrolyte, wherein the electrolyte is the non-aqueous lithium ion battery electrolyte of any one of claims 2-8.
10. The lithium ion battery of claim 9, wherein the positive electrode comprises an active material that is LiNixCoyMnzL(1-x-y-z)O2、LiCox'L(1-x')O2、LiNix”Ly'Mn(2-x”-y')O4、Liz'MPO4At least one of; wherein L is at least one of Co, Al, Sr, Mg, Ti, Ca, Zr, Zn, Si and Fe, x is more than or equal to 0 and less than or equal to 1, y is more than or equal to 0 and less than or equal to 1, z is more than 0 and less than or equal to 1, x + y + z is more than 0 and less than or equal to 1, x 'is more than 0 and less than or equal to 1, x is more than 0.3 and less than or equal to 0.6, and y' is more than 0.01 and less than or equal to 0.2; z' is more than or equal to 0.5 and less than or equal to 1, and M is at least one of Fe, Mn and Co.
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| CN114142087A (en) * | 2021-10-14 | 2022-03-04 | 合肥国轩高科动力能源有限公司 | Electrolyte for improving high-temperature performance of lithium ion battery and lithium ion battery |
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| CN114142087A (en) * | 2021-10-14 | 2022-03-04 | 合肥国轩高科动力能源有限公司 | Electrolyte for improving high-temperature performance of lithium ion battery and lithium ion battery |
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| CN113991176B (en) * | 2021-10-18 | 2022-08-19 | 傲普(上海)新能源有限公司 | Nonaqueous electrolyte and lithium battery using same |
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