CN112448034A - Non-aqueous electrolyte for high-voltage lithium ion battery and lithium ion battery - Google Patents
Non-aqueous electrolyte for high-voltage lithium ion battery and lithium ion battery Download PDFInfo
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- H—ELECTRICITY
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- 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
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
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Abstract
The invention belongs to the technical field of batteries, and discloses a non-aqueous electrolyte for a high-voltage lithium ion battery and the lithium ion battery. The non-aqueous electrolyte for the high-voltage lithium ion battery comprises a non-aqueous organic solvent, an electrolyte and a film forming additive, wherein the film forming additive contains a negative electrode film forming additive and a fluorine-containing phosphate additive shown in a structural formula 1. In the electrolyte, HOMO energy of the fluorine-containing phosphate compound shown in the structural formula 1 is higher than that of ethylene carbonate, and oxidation reaction preferentially occurs on the surface of a ternary material to form a stable and compact CEI film, so that the oxidation reaction of the electrolyte on the surface of an electrode is reduced; meanwhile, an interface film with smaller impedance is formed on the surface of the negative electrode, so that the dynamic characteristic in the battery can be improved, and the cycle life is prolonged; the negative electrode film forming additive such as vinyl sulfate is preferentially reduced and decomposed on the surface of the negative electrode to form an excellent solid electrolyte film, so that the chemical composition of the SEI film is enriched, the impedance is adjusted, and the high-low temperature performance, the rate capability and the storage performance of the battery are improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a non-aqueous electrolyte for a high-voltage lithium ion battery and the lithium ion battery.
Background
With the technological progress, the requirements of people on the quality of living environment are continuously improved, the problem of environmental pollution caused by the increasing exhaustion and consumption of fossil energy is more serious, and the research and development of clean and renewable new energy becomes urgent. A large number of new energy sources have been developed and used, such as solar, wind, tidal and geothermal energy, but these are limited in time and space and require appropriate conversion and storage for use.
The lithium ion battery is a green environment-friendly high-energy battery, and is a rechargeable battery which is most ideal and has the most potential in the world at present. Compared with other batteries, the battery has a series of advantages of no memory effect, rapid charge and discharge, high energy density, long cycle life, no environmental pollution and the like, so that the battery is widely applied to small-sized electronic equipment such as notebook computers, video cameras, mobile phones, electronic watches and the like. With the continuous improvement of the requirements of pure electric vehicles, hybrid electric vehicles, portable energy storage devices and the like on the capacity of the lithium ion battery, people expect to research and develop the lithium ion battery with higher energy density and power density to realize long-term endurance and energy storage. The energy density of the lithium ion battery can be improved by increasing the working voltage, but the development of the high-voltage lithium ion battery is limited by the oxidative decomposition of the common electrolyte under the high voltage. Therefore, development of a high-pressure resistant electrolyte is required.
Disclosure of Invention
The invention provides a non-aqueous electrolyte for a high-voltage lithium ion battery aiming at the requirements of the background technology, and the non-aqueous electrolyte effectively solves the problems of high-temperature gas generation and safety of the high-voltage lithium ion secondary battery.
In order to achieve the purpose of the invention, the non-aqueous electrolyte for the high-voltage lithium ion battery comprises a non-aqueous organic solvent, an electrolyte and a film forming additive, wherein the film forming additive contains a negative film forming additive and a fluorine-containing phosphate additive shown in a structural formula 1:
in the formula 1, R1、R2、R3Each independently selected from hydrogen atom, oxygen atom, carbon atom, nitrogen atom, sulfur atom, phosphorus atom, fluorine atom or organic group with 1-10 carbon atoms substituted by hydrogen atom, oxygen atom, carbon atom, nitrogen atom, sulfur atom, phosphorus atom, fluorine atom, and R1、R2、R3Contains at least one fluorine atom; the negative electrode film forming additive is at least two of 1, 2-bis- (2-cyanoethoxy) ethane (DENE), 1,3, 6-Hexanetrinitrile (HTCN), Succinonitrile (SN), Adiponitrile (AND), vinylene carbonate (VEC), 1, 3-Propane Sultone (PS), Propylene Sultone (PST), Butene Sultone (BS), methane disulfonic acid vinyl ester (MMDS) AND vinyl sulfate (DTD).
Preferably, the fluorophosphate additive shown in the structural formula 1 is one or more of a compound M1, a compound M2, a compound M3, a compound M4, a compound M5, a compound M6 and a compound M7:
preferably, the mass percentage of the fluorinated phosphate additive shown in the structural formula 1 in the nonaqueous electrolyte is 0.1-10%, and more preferably 0.5-4%.
In the present invention, the nonaqueous organic solvent is selected from a wide range of solvents, and may be one or more selected from cyclic carbonates, fluorine-substituted cyclic carbonates, chain carbonates, fluorine-substituted chain carbonates, chain carboxylates, sulfur-containing organic solvents, and fluoroether solvents. Wherein the cyclic carbonate solvent is one or more of ethylene carbonate, propylene carbonate and butylene carbonate; the fluorine-substituted cyclic carbonate solvent is one or more of fluoroethylene carbonate, 1, 2-difluoroethylene carbonate, 1, 2-trifluoroethylene carbonate, tetrafluoroethylene carbonate, 1-fluoro-2-methylethylene carbonate, 1-fluoro-1-methylethylene carbonate and 1, 2-difluoro-1-methylethylene carbonate; the chain carbonate solvent is one or more of dimethyl carbonate, diethyl carbonate and di-n-propyl carbonate; the fluorine-substituted chain carbonate is one or more of bis (fluoromethyl) carbonate, bis (difluoromethyl) carbonate, bis (trifluoromethyl) carbonate, bis (2-fluoroethyl) carbonate, bis (2, 2-difluoroethyl) carbonate, bis (2,2, 2-trifluoroethyl) carbonate, 2-fluoroethylmethyl carbonate, 2, 2-difluoroethylmethyl carbonate, 2,2, 2-trifluoroethylmethyl carbonate; the chain carboxylic ester solvent is one or more of methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate, sec-butyl acetate, isobutyl acetate, tert-butyl acetate, methyl propionate, ethyl propionate, propyl propionate, isopropyl propionate and methyl butyrate; the sulfur-containing organic solvent is one or more of sulfolane, 2-methyl sulfolane, 3-methyl sulfolane, diethyl sulfone, methyl ethyl sulfone, methyl propyl sulfone and compounds formed by replacing part of hydrogen of the sulfur-containing compounds by fluorine; the fluoroether solvent is one or more of 1,1,2, 2-tetrafluoroethyl-2, 2,3, 3-tetrafluoropropyl ether and 1,1,2, 2-tetrafluoroethyl-2, 2,3, 3-tetrafluoropropyl ether.
In the present invention, the electrolyte is not limited as long as it is used as an electrolyte in a target nonaqueous electrolyte secondary battery, and a known electrolyte can be used arbitrarily. When the nonaqueous electrolytic solution of the present invention is used for the high-voltage lithium ion battery, a lithium salt is generally used as the electrolyte, and among them, lithium hexafluorophosphate, lithium difluorophosphate, lithium tetrafluorophosphate, lithium difluorooxalato phosphate, lithium tetrafluoroborate, lithium bisoxalato borate, lithium difluorooxalato borate, lithium bisfluorosulfonylimide, lithium bistrifluoromethanesulfonylimide are preferable, and lithium hexafluorophosphate is more preferable.
Further, the mass percentage of the electrolyte in the nonaqueous electrolyte solution is 10-15%.
In another aspect, the invention further provides a high-voltage lithium ion battery, which comprises a positive electrode, a negative electrode, a diaphragm and the non-aqueous electrolyte for the high-voltage lithium ion battery.
Further, the active material of the positive electrode is LiNi1-x-yCoxMnyAlzOne or more of lithium cobaltate, lithium manganate, lithium nickel manganese oxide and manganese-rich solid solution, wherein 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 or equal to 0 and less than or equal to 1, and x + y + z is more than or equal to 0 and less than or equal to 1; the negative electrode material is one or more of natural graphite, artificial graphite, lithium titanate, a silicon-carbon negative electrode and a silicon negative electrode.
Further, the upper limit cut-off voltage of the lithium ion battery is 4.2-5V.
In the electrolyte, HOMO energy of the fluorine-containing phosphate compound shown in the structural formula 1 is higher than that of ethylene carbonate, and oxidation reaction preferentially occurs on the surface of a ternary material to form a stable and compact CEI film, so that the oxidation reaction of the electrolyte on the surface of an electrode is reduced; meanwhile, an interface film with smaller impedance is formed on the surface of the negative electrode, so that the dynamic characteristic in the battery can be improved, and the cycle life is prolonged; the negative electrode film forming additive such as vinyl sulfate is preferentially reduced and decomposed on the surface of the negative electrode to form an excellent solid electrolyte film, so that the chemical composition of the SEI film is enriched, the impedance is adjusted, and the high-low temperature performance, the rate capability and the storage performance of the battery can be 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. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention. 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 terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
The indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the number clearly indicates the singular. Further, the technical features of the embodiments of the present invention may be combined with each other as long as they do not conflict with each other.
Example 1
Preparing an electrolyte:
in a glove box filled with argon (the oxygen content is less than or equal to 1ppm, the water content is less than or equal to 1ppm), ethylene carbonate EC, fluoroethylene carbonate FEC, methyl ethyl carbonate EMC, diethylene carbonate DEC and propyl acetate EP are uniformly mixed and continuously stirred according to the volume ratio of 20:10:30:20:20, LiPF accounting for 12.5 percent of the total mass of the electrolyte is added into the mixed solution6. Subsequently, compound 1 in an amount of 1% by mass of the total electrolyte, ADN in an amount of 1% by mass of the total electrolyte, and 1, 3-propane sultone PS in an amount of 1% by mass of the total electrolyte were added to the mixed solution, and the mixed solution was stirred to be completely dissolved, thereby obtaining an electrolyte of example 1.
Preparing a lithium ion battery:
LiCoO as positive electrode active material2The conductive agent acetylene black and the binder polyvinylidene fluoride are fully stirred and uniformly mixed in an N-methyl pyrrolidone system according to the mass ratio of 95:3:2, and then coated on an aluminum foil to be dried and cold-pressed, so that the positive plate is obtained.
Fully stirring and uniformly mixing a negative active substance Si (15%)/AG (85%), a conductive agent super carbon black, a thickening agent carboxymethylcellulose sodium and a binder styrene butadiene rubber in a deionized water solvent system according to a mass ratio of 95:1:2:2, coating the mixture on a copper foil, drying and cold-pressing to obtain the negative plate.
Polyethylene is used as a base film, and a nano aluminum oxide coating is coated on the base film to be used as a diaphragm.
And stacking the positive plate, the powder and the negative plate in sequence to enable the diaphragm to be positioned between the positive plate and the negative plate to play an isolation role, and winding to obtain the bare cell. And placing the bare cell in an outer package, injecting the prepared electrolyte, and carrying out processes of packaging and placing, formation, aging, secondary packaging, capacity grading and the like to obtain the lithium cobalt oxide silicon carbon lithium ion battery.
Effect testing
(1) And (3) testing the normal-temperature cycle performance: at 25 ℃, the formed lithium ion battery is charged to 4.45V according to a constant current and a constant voltage of 1C, the current is cut off to 0.05C, and then the lithium ion battery is discharged to 3.0V according to a constant current of 1C. The 600 th cycle capacity retention rate was calculated after 600 cycles of charge/discharge. The calculation formula is as follows:
capacity retention at 600 weeks was 600-week-cycle discharge capacity/first-week-cycle discharge capacity × 100%.
(2) High temperature storage performance at 60 ℃: the cell was charged and discharged once at room temperature at 0.5C, the current was cut off at 0.05C and the initial capacity was recorded. Fully filling the battery at a constant current and a constant voltage of 0.5C, and testing the initial thickness and the initial internal resistance of the battery; storing the fully charged battery in a constant temperature environment of 60 ℃ for 28 days, testing the thermal thickness of the battery, and calculating the thermal state expansion rate; after the battery is cooled to the normal temperature for 6 hours, testing the cold thickness, the voltage and the internal resistance, discharging to 3.0V according to 0.5C, recording the residual capacity of the battery, and calculating the residual rate of the battery capacity, wherein the calculation formula is as follows:
the thermal state expansion ratio (%) of the battery is (thermal thickness-initial thickness)/initial thickness × 100%;
battery capacity remaining rate (%) — remaining capacity/initial capacity × 100%;
internal resistance change rate (%) - (internal resistance-initial internal resistance)/initial internal resistance × 100%
Examples 2 to 15
Examples 2 to 15 were the same as example 1 except that the electrolyte solvent and the additive composition and content were added as shown in Table 1.
TABLE 1 electrolyte compositions of examples 1-15
Examples 16 to 30
The battery systems of examples 16 to 30 were LiNi0.6Co0.2Mn0.2O2The composition and content of Si (15%) C (85%) were the same as in examples 1 to 15, except that the electrolyte solvent and additives were added as shown in Table 1. In the performance test method, 1C constant current and constant voltage charging is carried out to 4.35V to carry out normal temperature and low temperature cycle performance and high temperature storage performance tests.
Comparative examples 1 to 9
Comparative examples 1 to 9 were the same as example 1 except that the electrolyte solvent, the additive composition and the content were added as shown in Table 2.
TABLE 2 electrolyte compositions for comparative examples 1-9
Comparative examples 10 to 18
Comparative examples 10-18 lithium cell systems are LiNi0.6Co0.2Mn0.2O2The compositions of/Si (15%) C (85%), electrolyte solvent, additives and the like were the same as in comparative examples 1 to 9, and the specific contents were as shown in Table 2, and the performance was measuredIn the test, the 1C constant current and constant voltage charging is carried out to 4.35V to carry out the test of normal temperature and low temperature cycle performance and high temperature storage performance.
Table 3 shows the results of the cell performance tests of examples 1 to 30 and comparative examples 1 to 18:
TABLE 3 Battery Performance test of examples 1-30 and comparative examples 1-18
In tables 1-3 above, the letters of each chemical substance are abbreviated as follows:
EC (ethylene carbonate), FEC (fluoroethylene carbonate), 1, 2-difluoroethylene carbonate (DFEC), EMC (ethyl methyl carbonate), DEC (diethylene carbonate), EP (ethyl propionate), FEMC (fluoroethylene carbonate), D2(1,1,2, 2-tetrafluoroethyl-2, 2,3, 3-tetrafluoropropyl ether), den (1, 2-bis- (2-cyanoethoxy) ethane), HTCN (1,3, 6-hexanetricarbonitrile), SN (succinonitrile), AND (adiponitrile), VEC (vinyl vinylethylene carbonate), PS (1, 3-propanesultone), PST (propylene sultone), BS (butenedione), MMDS (ethylene methane disulfonate), DTD (ethylene sulfate).
As can be seen from examples 1 to 15 and comparative examples 1 to 9, for LiCoO2The normal temperature cycle performance and the high temperature storage performance of the lithium ion battery adopting the electrolyte of the embodiment 1-15 are superior to those of the lithium ion battery of the comparative example 1-9 in a silicon-carbon system. The invention can ensure that the high-capacity lithium cobaltate-silicon carbon battery system has long cycle life and excellent high-temperature storage performance by using the fluorine-containing phosphate additive shown in the structural formula 1 and other additives in a combined manner.
Comparing examples 12 to 15 with comparative examples 6 to 9, it was found that the room-temperature capacity retention rates of the batteries of comparative examples 6 to 5 were still poor despite the addition of a certain amount of the fluorophosphate-based additive of formula 1. The reason for this analysis is that the comparative examples 6 to 9 lack nitrile additives such as HTCN, done, SN, AND cannot form a film layer having stable properties at high voltage on the surface of the positive electrode material, AND the dissolved transition metal ions decompose the electrolyte, thereby decreasing irreversible capacity.
Comparing examples 8 to 11 with comparative examples 2 to 5, and examples 18 to 19 with comparative examples 11 to 14, the thermal expansion rate and capacity remaining rate of the battery after storage at 60 ℃ for 28 days in the comparative example were small because the electrolyte in the comparative example was not added with sulfate and sulfonate, which indicates that in order to maintain a high remaining capacity after storage at high temperature of the battery, in addition to the fluorinated phosphate additive of formula 1, sulfuric acid ester and sulfonic acid ester additives were supplemented, and gas evolution was suppressed.
Compared with examples 1-7, the capacity retention rate of the comparative example 1 without the fluorophosphate additive shown in the structural formula 1 is very low after 600 weeks of normal-temperature circulation, which shows that the interfacial film formed by the fluorophosphate additive shown in the structural formula 1 is not only stable and thin, but also has small impedance and can improve the circulation performance.
Comparative examples 16 to 30 and comparative examples 10 to 18 were compared for LiNi0.6Co0.2Mn0.2O2Silicon carbon system, derived from the reaction with LiCoO as described above2Similar conclusions for silicon carbon battery.
In conclusion, the electrolyte can ensure high-voltage LiCoO by improving the carbonate solvent at the interface of the electrode/electrolyte and cooperating with the fluorine-containing phosphate compound shown in the structural formula 1, the nitrile additive, the sulfate or/and the sulfonate additive2Silicon/carbon and LiNi0.6Co0.2Mn0.2O2The lithium ion battery with silicon carbon and other types obtains excellent cycle performance and high-temperature storage performance.
It will be understood by those skilled in the art that the foregoing is merely exemplary of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The non-aqueous electrolyte for the high-voltage lithium ion battery is characterized by comprising a non-aqueous organic solvent, an electrolyte and a film forming additive, wherein the film forming additive contains a negative film forming additive and a fluorine-containing phosphate additive shown in a structural formula 1:
in the formula 1, R1、R2、R3Each independently selected from hydrogen atom, oxygen atom, carbon atom, nitrogen atom, sulfur atom, phosphorus atom, fluorine atom or organic group with 1-10 carbon atoms substituted by hydrogen atom, oxygen atom, carbon atom, nitrogen atom, sulfur atom, phosphorus atom, fluorine atom, and R1、R2、R3Contains at least one fluorine atom; the negative electrode film forming additive is at least two of 1, 2-bis- (2-cyanoethoxy) ethane (DENE), 1,3, 6-Hexanetrinitrile (HTCN), Succinonitrile (SN), Adiponitrile (AND), vinylene carbonate (VEC), 1, 3-Propane Sultone (PS), Propylene Sultone (PST), Butene Sultone (BS), methane disulfonic acid vinyl ester (MMDS) AND vinyl sulfate (DTD).
2. The nonaqueous electrolyte for a high-voltage lithium ion battery according to claim 1, wherein the fluorinated phosphate additive represented by the structural formula 1 is one or more of a compound M1, a compound M2, a compound M3, a compound M4, a compound M5, a compound M6, and a compound M7:
3. the nonaqueous electrolyte solution for a high-voltage lithium ion battery according to claim 1 or 2, wherein the weight percentage of the fluorinated phosphate additive represented by the structural formula 1 in the nonaqueous electrolyte solution is 0.1% to 10%, preferably 0.5% to 4%.
4. The nonaqueous electrolyte solution for a high-voltage lithium ion battery according to any one of claims 1 and 2, wherein the nonaqueous organic solvent is one or more selected from cyclic carbonates, fluorine-substituted cyclic carbonates, chain carbonates, fluorine-substituted chain carbonates, chain carboxylates, sulfur-containing organic solvents, and fluoroether solvents.
5. The nonaqueous electrolyte for a high-voltage lithium ion battery according to claim 4, wherein the cyclic carbonate-based solvent is one or more of ethylene carbonate, propylene carbonate, and butylene carbonate; the fluorine-substituted cyclic carbonate solvent is one or more of fluoroethylene carbonate, 1, 2-difluoroethylene carbonate, 1, 2-trifluoroethylene carbonate, tetrafluoroethylene carbonate, 1-fluoro-2-methylethylene carbonate, 1-fluoro-1-methylethylene carbonate and 1, 2-difluoro-1-methylethylene carbonate; the chain carbonate solvent is one or more of dimethyl carbonate, diethyl carbonate and di-n-propyl carbonate; the fluorine-substituted chain carbonate is one or more of bis (fluoromethyl) carbonate, bis (difluoromethyl) carbonate, bis (trifluoromethyl) carbonate, bis (2-fluoroethyl) carbonate, bis (2, 2-difluoroethyl) carbonate, bis (2,2, 2-trifluoroethyl) carbonate, 2-fluoroethylmethyl carbonate, 2, 2-difluoroethylmethyl carbonate, 2,2, 2-trifluoroethylmethyl carbonate; the chain carboxylic ester solvent is one or more of methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate, sec-butyl acetate, isobutyl acetate, tert-butyl acetate, methyl propionate, ethyl propionate, propyl propionate, isopropyl propionate and methyl butyrate; the sulfur-containing organic solvent is one or more of sulfolane, 2-methyl sulfolane, 3-methyl sulfolane, diethyl sulfone, methyl ethyl sulfone, methyl propyl sulfone and compounds formed by replacing part of hydrogen of the sulfur-containing compounds by fluorine; the fluoroether solvent is one or more of 1,1,2, 2-tetrafluoroethyl-2, 2,3, 3-tetrafluoropropyl ether and 1,1,2, 2-tetrafluoroethyl-2, 2,3, 3-tetrafluoropropyl ether.
6. The nonaqueous electrolyte solution for a high-voltage lithium ion battery according to any one of claims 1 or 2, wherein the electrolyte is a lithium salt; for example, lithium hexafluorophosphate, lithium difluorophosphate, lithium tetrafluorophosphate, lithium difluorooxalato phosphate, lithium tetrafluoroborate, lithium bisoxalato borate, lithium difluorooxalato borate, lithium bisfluorosulfonylimide, lithium bistrifluoromethanesulfonylimide, and preferably lithium hexafluorophosphate.
7. The nonaqueous electrolyte solution for a high-voltage lithium ion battery according to claim 6, wherein the electrolyte solution is contained in an amount of 10 to 15% by mass in the nonaqueous electrolyte solution.
8. A high-voltage lithium ion battery comprising a positive electrode, a negative electrode, a separator and the nonaqueous electrolyte solution for high-voltage lithium ion batteries according to any one of claims 1 to 7.
9. The high voltage lithium ion battery of claim 8, wherein the active material of the positive electrode is LiNi1-x-yCoxMnyAlzOne or more of lithium cobaltate, lithium manganate, lithium nickel manganese oxide and manganese-rich solid solution, wherein 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 or equal to 0 and less than or equal to 1, and x + y + z is more than or equal to 0 and less than or equal to 1; the negative electrode material is one or more of natural graphite, artificial graphite, lithium titanate, a silicon-carbon negative electrode and a silicon negative electrode.
10. The high voltage lithium ion battery of claim 8, wherein the lithium ion battery has an upper cutoff voltage of 4.2-5V.
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| CN114267879A (en) * | 2021-10-14 | 2022-04-01 | 湖南立方新能源科技有限责任公司 | Functional additive, electrolyte and lithium battery |
| CN114300746A (en) * | 2021-12-15 | 2022-04-08 | 惠州锂威新能源科技有限公司 | Electrolyte additive, electrolyte and energy storage device |
| CN115312865A (en) * | 2022-10-13 | 2022-11-08 | 宁德新能源科技有限公司 | Electrochemical device and electronic apparatus |
| CN115799643A (en) * | 2023-01-18 | 2023-03-14 | 如鲲(江苏)新材料科技有限公司 | Nonaqueous electrolyte solution, lithium ion battery, battery module, battery pack, and electric device |
| WO2023078059A1 (en) * | 2021-11-02 | 2023-05-11 | 宁德新能源科技有限公司 | Electrolyte, electrochemical apparatus using same, and electronic apparatus |
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| CN115799643A (en) * | 2023-01-18 | 2023-03-14 | 如鲲(江苏)新材料科技有限公司 | Nonaqueous electrolyte solution, lithium ion battery, battery module, battery pack, and electric device |
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