CN109687022B - Electrolyte containing fluorine solvent and pyridine additive and lithium ion battery using electrolyte - Google Patents
Electrolyte containing fluorine solvent and pyridine additive and lithium ion battery using electrolyte 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
- H01M10/056—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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- H01M10/0567—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
- 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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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M2300/0017—Non-aqueous electrolytes
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Abstract
The invention discloses an electrolyte containing a fluorine solvent and a pyridine additive and a lithium ion battery using the electrolyte. The electrolyte comprises lithium salt, an organic solvent and an additive, wherein the organic solvent comprises one or more of fluoro organic solvent, chain carbonates, cyclic carbonates and carboxylic esters, and the additive comprises a pyridine compound containing a nitrile group. Compared with the traditional lithium ion battery without the electrolyte, the electrolyte is added with the pyridine compound containing nitrile groups and is matched with a fluorinated organic solvent with good wettability, so that the electrode interface can be optimized, the impedance between the interfaces can be reduced, and the low-temperature performance can be improved; meanwhile, the property of an electrode/electrolyte interface film can be improved, the dissolution of transition metal is inhibited, the gas expansion speed of the battery under high temperature and high pressure is slowed down, and the cycle life of the lithium ion battery under high temperature and high pressure is prolonged.
Description
Technical Field
The invention relates to the field of lithium ion batteries, in particular to an electrolyte containing a fluorine solvent and a pyridine additive and a lithium ion battery using the electrolyte.
Background
At present, lithium ion batteries are widely applied to the fields of electric automobiles, electric tools, aerospace and the like due to the advantages of large energy density, long cycle life, no memory effect, environmental protection and the like, however, with the continuous updating of electronic equipment and the attention of people to electric tools, people put higher requirements on the energy density, the cycle performance, the high and low temperature performance and the like of the lithium ion batteries.
At present, LiCoPO is a high-voltage positive electrode material reported4、LiNiPO4And LiNi0.5Mn1.5And the like, the charging voltage platform of the lithium ion secondary battery is close to or higher than 5V, but the development of the matched non-aqueous organic electrolyte is seriously lagged behind the high-voltage anode material, and the application of the lithium ion secondary battery is limited. The conventional electrolyte is easy to decompose between the positive electrode and the negative electrode of the battery, gas is generated, the internal pressure of the battery is increased, the internal temperature rise is unstable, and particularly under the conditions of high temperature and high pressure, the safety and the cycle life of the battery are seriously influenced. E.g. H produced by decomposition2O LiPF6The carbonate electrolyte system is subjected to autocatalytic reaction, and the intermediate product HF can cause the dissolution of metal ions Mn and Ni in the anode material, so that the anode material and the cathode material are deteriorated, the battery capacity is reduced, and the cycle life is prolonged. The electrolyte is used as an ion conductor for conducting between the positive electrode and the negative electrode of the battery, is an important component of the lithium ion battery, is called as 'blood' of the lithium ion battery, improves the performance of the electrolyte through the discussion of novel additives and solvents, and has become a hotspot of the research of the lithium ion battery.
Disclosure of Invention
The inventor of the invention finds that fluorine has strong electronegativity and weak polarity, a fluorinated solvent has the advantages of low melting point, high flash point, high oxidative decomposition voltage and the like, and the oxidative decomposition voltage of the whole electrolyte is improved by fluorinating a carbonate or carboxylic ester solvent. Meanwhile, the fluorinated solvent has good wettability, can optimize an electrode interface, reduce the impedance between interfaces and improve the low-temperature performance of the battery, so that the fluorinated organic solvent has great development prospect as the electrolyte solvent of the lithium ion battery.
Pyridine is weakly alkaline and can be neutralized by acid, nitrile groups can be complexed with metal ions to inhibit dissolution of the metal ions, and patent WO2015088052 introduces nitrile groups to improve the complexing ability of additives to the metal ions, but excessive nitrile groups can increase the impedance of the positive electrode while improving the protection ability of the positive electrode, so that the cycle performance of the battery is reduced, and the cycle and low-temperature effects are poor. Based on the research on the fluorinated solvent, the inventor prepares the high-voltage lithium ion battery electrolyte by matching the fluorinated solvent with the nitrile-group-containing pyridine compound, and the battery electrolyte can improve the property of an electrode/electrolyte interface film, ensure the low-temperature performance, simultaneously slow down the gas expansion speed of the battery during storage at high temperature and high pressure, and improve the cycle life, high-temperature cycle performance and high-temperature storage performance of the lithium ion battery under high voltage.
In order to achieve the purpose of the invention, the invention provides a high-voltage electrolyte containing a fluorine solvent and a pyridine additive, which comprises a lithium salt, an organic solvent and an additive, wherein the organic solvent comprises one or more of a fluoro organic solvent, a chain carbonate organic solvent, a cyclic carbonate organic solvent and a carboxylic ester organic solvent, and the additive comprises a pyridine compound.
Further, the fluorinated organic solvent is represented by formula (I) or formula (II):
in the formula (I), R1And R2Each represents an alkyl or alkoxy group having 1 to 6 carbon atoms, or a fluoroalkyl or fluoroalkoxy group having 1 to 6 carbon atoms, and R1And R2At least one of which is a fluoroalkyl group or a fluoroalkoxy group having 1 to 6 carbon atoms; in the formula (II), M1And M2Each represents an alkyl or alkoxy group having 1 to 6 carbon atoms, or a fluoroalkyl or fluoroalkoxy group having 1 to 6 carbon atoms, and M1And M2At least one of which is a fluoroalkyl group or a fluoroalkoxy group having 1 to 6 carbon atoms.
Further, according to some embodiments of the present invention, the compounds of formula (I) include, but are not limited to, the following compounds:
still further, according to some embodiments of the invention, the compound of formula (II) includes, but is not limited to, the following compounds:
preferably, the fluorinated organic solvent of formula (I) or formula (II) comprises 2-30% by weight of the solvent, more preferably, the fluorinated organic solvent of formula (I) or formula (II) comprises 5-15% by weight of the solvent.
Further, the pyridine compound of the invention is represented by the formula (III):
wherein, X1、X2、X3、X4And X5Each independently selected from a hydrogen atom, an alkyl group of 1 to 5 carbon atoms, an alkoxy group of 1 to 5 carbon atoms, a halogen atom, a nitrile group or an alkoxynitrile group of 1 to 5 carbon atoms, and X1、X2、X3、X4And X5In the formula (I), at least one is nitrile group or alkoxy nitrile group with 1-5 carbon atoms.
Still further, according to some embodiments of the invention, the compound of formula (III) includes, but is not limited to, the following compounds:
preferably, the compound of formula (III) is present in an amount of 0.5-10%, for example 1-2% by weight of the electrolyte.
Further, the additive also comprises 1,3 propane sultone (1,3-PS) and lithium difluorophosphate (LiPO)2F2) And one or more additives selected from Vinylene Carbonate (VC), Vinyl Ethylene Carbonate (VEC), vinyl sulfate (DTD) and fluoroethylene carbonate (FEC), wherein the mass percent of the additives in the electrolyte is preferably 0.1-15%.
Preferably, the additive comprises Vinylene Carbonate (VC), 1, 3-propane sulfonic acid lactone (1,3-PS) and fluoroethylene carbonate (FEC).
More preferably, the mass ratio of Vinylene Carbonate (VC), 1,3 propane sulfonic acid lactone (1,3-PS) and fluoroethylene carbonate (FEC) in the additive is (0.5-1.5): (2-4): (9-11), for example, 1: 3: 10.
further, the chain carbonate-based organic solvent may be selected from one or more of dimethyl carbonate (DMC), diethyl carbonate (DEC), Ethyl Methyl Carbonate (EMC), dipropyl carbonate (DPC); the cyclic carbonate organic solvent may be one or more selected from Ethylene Carbonate (EC), Vinylene Carbonate (VC), and Propylene Carbonate (PC); the carboxylic ester-based organic solvent may be one or more selected from Ethyl Acetate (EA), Ethyl Propionate (EP), Methyl Acetate (MA), propyl acetate (PE), Methyl Propionate (MP), Methyl Butyrate (MB), and Ethyl Butyrate (EB).
Preferably, the organic solvent comprises Ethylene Carbonate (EC), Ethyl Methyl Carbonate (EMC) and diethyl carbonate (DEC), and more preferably, the mass ratio of the Ethylene Carbonate (EC), the Ethyl Methyl Carbonate (EMC) and the diethyl carbonate (DEC) is (1-3): (4-6): (2-4), for example, 2: 5: 3.
further, the lithium salt may be selected from LiPF6、LiBF4、LiClO4、LiBOB、LiODFB、LiAsF6、LiN(SO2CF3)2、LiN(SO2F)2And the concentration of the lithium salt in the electrolyte is 0.5 to 2M, for example 1 to 1.5M, in terms of lithium ions.
The invention also provides a lithium ion battery using the electrolyte, and preferably, the preparation method of the lithium ion battery comprises the steps of injecting the electrolyte of the high-voltage lithium ion battery into a fully dried 4.35V nickel cobalt lithium manganate/silicon carbon soft package battery, and carrying out the working procedures of laying aside at 45 ℃, forming by a high-temperature clamp and carrying out secondary sealing.
The high-voltage lithium ion battery electrolyte containing the fluorine solvent and the pyridine additive can effectively inhibit metal dissolution, reduce decomposition and gas production of the electrolyte, protect the positive electrode, improve the high-temperature storage performance of the battery, reduce the increase of resistance and improve the low-temperature performance of the lithium ion battery. Compared with the traditional lithium ion battery without the high-voltage electrolyte, the electrolyte is added with the pyridine compound containing nitrile groups and is matched with a fluorinated organic solvent with good wettability, so that the electrode interface can be optimized, the impedance between interfaces can be reduced, and the low-temperature performance can be improved; meanwhile, the property of an electrode/electrolyte interface film can be improved, the dissolution of transition metal is inhibited, the gas expansion speed of the battery under high temperature and high pressure is slowed down, and the cycle life of the lithium ion battery under high temperature and high pressure is prolonged.
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.
As used herein, the terms "comprises," "comprising," "includes," "including," "contains," "containing," or any other variation thereof, 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.
Comparative example 1
The high-voltage lithium ion battery electrolyte is prepared by the following method: in a glove box, Ethylene Carbonate (EC), Ethyl Methyl Carbonate (EMC) and diethyl carbonate (DEC) were mixed in a weight ratio of 2: 5: 3, and then adding lithium hexafluorophosphate to dissolve the mixture to prepare an electrolyte solution of which the lithium hexafluorophosphate concentration is 1M. Then, 0.5% by mass of Vinylene Carbonate (VC), 1.5% by mass of 1,3 propane sulfonic acid lactone (1,3-PS), and 5% by mass of fluoroethylene carbonate (FEC) were added to the electrolyte.
And injecting the prepared high-voltage lithium ion battery electrolyte into a fully dried 4.35V nickel cobalt lithium manganate/silicon carbon soft package battery, and carrying out battery performance test after the procedures of standing at 45 ℃, high-temperature clamp formation, secondary sealing and the like to obtain the battery used in the comparative example 1.
Example 1
The high-voltage lithium ion battery electrolyte is prepared by the following method: in a glove box, Ethylene Carbonate (EC), Ethyl Methyl Carbonate (EMC) and diethyl carbonate (DEC) were mixed in a weight ratio of 2: 5: 3, and then adding a fluorinated organic solvent (1) with the mass fraction of 5% into the mixed solvent; adding lithium hexafluorophosphate for dissolution to prepare an electrolyte solution with the concentration of lithium hexafluorophosphate being 1M. Then, 0.5% by mass of Vinylene Carbonate (VC), 1.5% by mass of 1,3 propane sulfonic acid lactone (1,3-PS), and 5% by mass of fluoroethylene carbonate (FEC), and 1% by mass of pyridine compound (5) were added to the electrolyte.
The prepared high-voltage electrolyte for the lithium ion battery is injected into a fully dried 4.35V nickel cobalt lithium manganate/silicon carbon soft package battery, and after the procedures of standing at 45 ℃, high-temperature clamp formation, secondary sealing and the like, the battery performance test is carried out, so that the battery used in example 1 is obtained.
In the present invention, other comparative examples and preparation methods of examples refer to comparative example 1 and example 1, and table 1 is a table of electrolyte formulations of each example and comparative example.
TABLE 1 electrolyte formulations for the examples and comparative examples
Lithium ion battery performance testing
1. High temperature cycle performance
Under the condition of high temperature (45 ℃), the lithium ion battery is charged to 4.35V under the constant current and constant voltage of 1C, and then is discharged to 3.0V under the constant current of 1C. After 300 cycles of charge and discharge, the capacity retention rate after the 300 th cycle was calculated as:
2. 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 4.35V 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:
3. low temperature cycle performance
The lithium ion battery is charged to 4.35V at a constant current and a constant voltage of 0.5 ℃ under the condition of low temperature (10 ℃), and then discharged to 3.0V under the condition of a constant current of 0.5 ℃. After 50 cycles of charge and discharge, the capacity retention rate after the 50 th cycle was calculated as:
the results of the battery performance of each of the above-described specific comparative examples and examples are shown in table 2.
TABLE 2 Battery Performance results for each of the specific examples
As can be seen from the data in the above table, in comparative example 1, when the lithium nickel cobalt manganese oxide/silicon carbon soft-package battery with a high voltage of 4.35V is applied, after 0.5% by mass of Vinylene Carbonate (VC), 1.5% by mass of 1, 3-propanesulfonic lactone (1,3-PS) and 5% by mass of fluoroethylene carbonate (FEC) are added, since the negative electrode of VC forms a film, an organic polymeric film is mainly formed, and is not able to resist high temperature and is easy to decompose, while the positive electrode surface can resist high temperature, but has poor thermal stability, and meanwhile, VC itself has a lower oxidation potential and is easy to oxidize and decompose at a high potential, the high-temperature cycle performance of the battery is not good, the high-temperature storage performance is general, the battery has a certain amount of generated gas, which causes battery expansion, and the cycle performance of the battery under a low-temperature condition.
After the novel fluoro-solvent with the content of 5% is added into the electrolyte (namely, comparative examples 2, 3, 4 and 5), the low-temperature cycle performance of the battery is improved to a certain extent, and the reason is presumed that the wetting property of the electrolyte to a pole piece is increased by the fluoro-solvent, so that the impedance of the battery is reduced, the low-temperature cycle performance of the battery is greatly improved, and particularly, when the novel fluoro-solvent is a compound (1) or a compound (3), the improvement effect is more obvious.
When the novel fluorinated solvent of the present invention was not added, but the pyridine compound containing nitrile groups in an amount of 1% was separately added (i.e., comparative examples 6 and 8), it was found that the high-temperature cycle performance of the battery was significantly improved. Presumably, the nitrile group is polymerized to form a film on the surface of the positive electrode of the battery, the activity of the positive electrode is inhibited, the occurrence of side reactions is reduced, and simultaneously, lone-pair electrons on nitrogen atoms in pyridine molecules play a Lewis base effect and can react with PF generated after lithium hexafluorophosphate is decomposed under high temperature conditions5Or POF3The compound forms a complex, so that the damage of an acid substance to a battery system is reduced, and the high-temperature performance of the battery is improved; however, the low temperature cycle effect is poor due to the increase of the resistance after film formation, and particularly when the amount of the cyanopyridine compound is increased to 2% (i.e., comparative examples 7 and 9), the cycle performance may be suddenly reduced due to the excessively large film formation resistance.
In some embodiments of the present invention, four new fluorinated solvents, i.e., compound (1), compound (2), compound (3), and compound (4), are used, and when the addition amounts of the four new fluorinated solvents are 5% or 15% of the total mass of the solvents, the addition amounts of the two nitrile-containing pyridine compounds (compound (5) and compound (6)) are adjusted to be 1% or 2% of the total mass of the electrolytes, respectively, and mixed to prepare 32 high voltage electrolytes, and corresponding lithium ion batteries are prepared for electrical performance testing, and through comparative analysis of experimental data of examples and comparative examples, the following conclusions can be obtained:
on the whole, the novel fluoro solvent (the addition amount is 2-30% of the mass of the solvent) and the nitrile group-containing pyridine compound (the addition amount is 0.5-15% of the mass of the electrolyte) are matched for use, so that the high-temperature circulation and high-temperature storage performance of the battery can be obviously improved on the basis of ensuring the low-temperature circulation performance of the battery;
secondly, no matter the compound is chain-shaped fluoro-carbonic ester or chain-shaped fluoro-carboxylic ester, the low-temperature performance of the battery can be improved to a certain extent, which is probably caused by the fact that the fluoro-solvent has better wettability on a pole piece, however, when the addition amount of the fluoro-solvent is more, the solubility of the fluoro-solvent on lithium salt is reduced, the viscosity is increased, the conductivity is reduced, the impedance is improved to a greater or lesser extent, and the cycle performance is reduced;
thirdly, the nitrile group-containing pyridine compound shown in the formula (III) is used as an additive, when the addition amount is 1%, the high-temperature storage performance of the electrolyte can be obviously improved, but when the addition amount is 2%, the performance of the electrolyte at high temperature is reduced;
and fourthly, although the novel fluoro solvent or the nitrile group-containing pyridine compound has better effect in certain performance aspects when being used independently, the novel fluoro solvent and the nitrile group-containing pyridine compound are mixed to improve the comprehensive performance of the high-voltage battery to a certain extent, and the high-voltage electrolyte with great potential can be obtained.
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 electrolyte contains a lithium salt, an organic solvent and an additive, and is characterized in that the organic solvent contains a fluoro organic solvent, ethylene carbonate, methyl ethyl carbonate and diethyl carbonate, and the additive contains a pyridine compound;
the fluorinated organic solvent is represented by formula (I) or formula (II):
in the formula (I), R1And R2Each represents an alkyl or alkoxy group having 1 to 6 carbon atoms, or a fluoroalkyl or fluoroalkoxy group having 1 to 6 carbon atoms, and R1And R2At least one of which is a fluoroalkyl group or a fluoroalkoxy group having 1 to 6 carbon atoms; in the formula (II), M1And M2Each represents an alkyl or alkoxy group having 1 to 6 carbon atoms, or a fluoroalkyl or fluoroalkoxy group having 1 to 6 carbon atoms, and M1And M2At least one of which is a fluoroalkyl group or a fluoroalkoxy group having 1 to 6 carbon atoms;
the pyridine compound is shown as a formula (III):
wherein, X1、X2、X3、X4And X5Each independently selected from a hydrogen atom, an alkyl group of 1 to 5 carbon atoms, an alkoxy group of 1 to 5 carbon atoms, a halogen atom, a nitrile group or an alkoxynitrile group of 1 to 5 carbon atoms, and X1、X2、X3、X4And X5In the formula (I), at least one is nitrile group or alkoxy nitrile group with 1-5 carbon atoms; the additive also comprises VC, 1,3-PS and FEC; the fluorinated organic solvent of the formula (I) or the formula (II) accounts for 5-15% of the mass of the solvent.
2. The fluorine-containing solvent and pyridine additive electrolyte according to claim 1, wherein the compound represented by formula (I) is one selected from the following compounds (1) and (2):
the compound represented by the formula (II) is selected from one of the following compounds (3) and (4):
3. the fluorine-containing solvent and pyridine additive electrolyte according to claim 1, wherein the compound represented by formula (III) is one selected from the following compounds (5) and (6):
4. the electrolyte solution containing the fluorine solvent and the pyridine additive according to claim 1, wherein the compound represented by the formula (III) accounts for 0.5 to 10% by mass of the electrolyte solution.
5. The electrolyte solution containing the fluorine solvent and the pyridine additive according to claim 4, wherein the compound represented by the formula (III) accounts for 1 to 2% by mass of the electrolyte solution.
6. The electrolytic solution containing the fluorine-containing solvent and the pyridine additive according to claim 1, wherein the mass ratio of the ethylene carbonate, the ethyl methyl carbonate, and the diethyl carbonate is (1-3): (4-6): (2-4).
7. The electrolyte solution containing the fluorine-containing solvent and the pyridine additive according to claim 6, wherein the mass ratio of the ethylene carbonate, the ethyl methyl carbonate, and the diethyl carbonate is 2: 5: 3.
8. the fluorine solvent and pyridine additive-containing electrolyte according to claim 1, wherein the lithium salt is selected from LiPF6、LiBF4、LiClO4、LiBOB、LiODFB、LiAsF6、LiN(SO2CF3)2、LiN(SO2F)2And the concentration of the lithium salt in the electrolyte is 0.5 to 2M in terms of lithium ions.
9. The electrolyte of claim 1, wherein the concentration of the lithium salt in the electrolyte is 1-1.5M.
10. A lithium ion battery using the electrolyte solution containing the fluorine-containing solvent according to any one of claims 1 to 9 and a pyridine-based additive.
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| CN111313091B (en) * | 2020-03-03 | 2021-08-06 | 宁德新能源科技有限公司 | Electrolyte solution, electrochemical device, and electronic device |
| CN112368872A (en) * | 2020-03-31 | 2021-02-12 | 宁德新能源科技有限公司 | Electrolyte and electrochemical device |
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