CN112397782A - Electrolyte containing sulfur-containing lithium salt additive and lithium ion battery containing electrolyte - Google Patents

Electrolyte containing sulfur-containing lithium salt additive and lithium ion battery containing electrolyte Download PDF

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Publication number
CN112397782A
CN112397782A CN201910740040.2A CN201910740040A CN112397782A CN 112397782 A CN112397782 A CN 112397782A CN 201910740040 A CN201910740040 A CN 201910740040A CN 112397782 A CN112397782 A CN 112397782A
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electrolyte
carbonate
lithium salt
sulfur
additive
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杨冰
吴杰
周彤
曹青青
杜建委
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Shanshan Advanced Materials Quzhou Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0567—Liquid materials characterised by the additives
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • 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

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  • Manufacturing & Machinery (AREA)
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  • Electrochemistry (AREA)
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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Secondary Cells (AREA)

Abstract

The invention belongs to the field of batteries, and discloses an electrolyte containing a sulfur-containing lithium salt additive and a lithium ion battery containing the electrolyte. The electrolyte containing the sulfur-containing lithium salt additive comprises a lithium salt, an organic solvent and an additive, wherein the organic solvent contains one or more of chain carbonate, cyclic carbonate and carboxylic ester, and the additive contains a sulfur-containing lithium salt compound shown in a general formula (I). The non-aqueous electrolyte for the lithium ion battery is added with the sulfur-containing lithium salt, and the addition of the sulfur-containing lithium salt improves the permeability of an SEI film to lithium ions, so that the impedance is low, and the cycle performance is good. Meanwhile, the toughness of an SEI film can be improved due to the existence of unsaturated bonds in the lithium salt containing sulfur, and a lithium sulfonate film formed by the sulfonic acid additive has a good high-temperature effect.

Description

Electrolyte containing sulfur-containing lithium salt additive and lithium ion battery containing electrolyte
Technical Field
The invention relates to the field of batteries, in particular to a non-aqueous electrolyte containing a sulfur-containing lithium salt additive for a lithium ion battery and the lithium ion battery using the electrolyte.
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. Due to the increasing demand for endurance, batteries with high energy density have become a hot point of research. On one hand, electrode materials with high energy density, such as high nickel materials, lithium-rich manganese-based electrode materials, silicon-carbon negative electrodes and the like, are attracting attention; on the other hand, high voltage lithium ion batteries are the main trend of current research, and present new challenges to battery materials.
In order to realize high energy of the lithium ion secondary battery, it is generally realized by increasing the operating voltage of the lithium ion secondary battery or developing a high-energy positive electrode material. 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 a high-voltage cathode material is seriously lagged by a matched non-aqueous organic electrolyte, so that the application of the lithium ion secondary battery is limited.
Non-aqueous organic electrolytes commonly used today, such as 1M LiPF6The nonaqueous organic electrolyte dissolved in the carbonate solvent can generate side reaction with the anode material in the charging process and further be oxidized and decomposed to generate CO in a high-voltage (above 4.35V) battery system2、H2O, etc. oxidation products, CO2The generation of the electrolyte poses a potential threat to the safety performance of the battery; h2Production of O makes LiPF6The carbonate electrolyte system undergoes an autocatalytic reaction, the production of HF as an intermediate product thereof leads to LiMn1.5Ni0.5The dissolution of metal ions Mn and Ni in the material causes the distortion or collapse of the structure of the material, and finally causes the reduction of the cycle performance, the volume expansion and the discharge capacity of the lithium ion secondary battery, so the material cannot be applied to a high-voltage lithium ion secondary battery system.
Disclosure of Invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the background art and to provide an electrolyte containing a sulfur-containing lithium salt additive that can stably operate at high voltage. The non-aqueous electrolyte for the lithium ion battery is added with the sulfur-containing lithium salt, and the addition of the sulfur-containing lithium salt improves the permeability of an SEI film to lithium ions, so that the impedance is low, and the cycle performance is good. Meanwhile, the toughness of an SEI film can be improved due to the existence of unsaturated bonds in the lithium salt containing sulfur, and a lithium sulfonate film formed by the sulfonic acid additive has a good high-temperature effect.
In order to achieve the purpose of the present invention, the electrolyte containing a sulfur-containing lithium salt additive of the present invention comprises a lithium salt, an organic solvent and an additive, wherein the organic solvent comprises one or more of chain carbonates, cyclic carbonates and carboxylic esters, and the additive comprises a sulfur-containing lithium salt compound represented by the general formula (I):
Figure BDA0002163620280000021
in the formula (I), R1Represents an unsaturated hydrocarbon group having less than 20 carbon atoms.
Further, according to an embodiment of the present invention, the compound represented by the general formula (I) includes the following compounds:
Figure BDA0002163620280000022
preferably, the compound represented by the general formula (I) accounts for 0.1-5%, for example, 0.2-2% of the electrolyte.
Further, the lithium salt is selected from LiPF6、LiBF4、LiClO4、LiBOB、LiODFB、LiAsF6、LiN(SO2CF3)2、LiN(SO2F)2One or more of; preferably, the concentration of the lithium salt in the electrolyte is 0.5 to 2M, more preferably 1 to 1.5M, in terms of lithium ions.
Still further, the lithium salt is selected from LiPF6And, in terms of lithium ions, the LiPF6The concentration in the electrolyte is 1-1.5M, for example 1.1M.
Further, the chain carbonate is selected from one or more of dimethyl carbonate (DMC), diethyl carbonate (DEC), Ethyl Methyl Carbonate (EMC) and dipropyl carbonate (DPC); the cyclic carbonate is selected from one or more of Ethylene Carbonate (EC), Vinylene Carbonate (VC) and Propylene Carbonate (PC); the carboxylic acid ester is selected from one or more of Ethyl Acetate (EA), Ethyl Propionate (EP), Methyl Acetate (MA), propyl acetate (PE), Methyl Propionate (MP), Methyl Butyrate (MB) and Ethyl Butyrate (EB).
Further, the organic solvent comprises ethylene carbonate, propylene carbonate, diethyl carbonate and ethyl methyl carbonate; preferably, the organic solvent comprises ethylene carbonate, propylene carbonate, diethyl carbonate and ethyl methyl carbonate in a weight ratio of 30:10:30:30, were mixed.
Further, the additive also comprises 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).
Furthermore, the additive also comprises 1, 3-propane sultone and vinylene carbonate; preferably, the additive also comprises 1, 3-propane sultone accounting for 3% of the mass of the electrolyte and vinylene carbonate accounting for 0.5% of the mass of the electrolyte.
In another aspect, the invention further provides a lithium ion battery, which uses the electrolyte containing the sulfur-containing lithium salt additive.
Preferably, the preparation method of the lithium ion battery comprises the step of injecting the nonaqueous electrolytic solution for the lithium ion battery into a fully dried nickel: cobalt: the Nickel Cobalt Manganese (NCM)/graphite soft package battery with manganese being 5:2:3 is subjected to the working procedures of standing at 45 ℃, high-temperature clamp formation and secondary sealing.
The non-aqueous electrolyte containing the sulfur-containing lithium salt additive for the lithium ion battery can effectively reduce the impedance of the battery and improve the working performance of the battery under the low-temperature condition. The addition of the sulfur-containing lithium salt in the electrolyte improves the permeability of the SEI film to lithium ions, so that the impedance is low and the cycle performance is good; meanwhile, the sulfonic acid additive can form an SEI film of lithium sulfonate salts, has good high-temperature tolerance, and can effectively inhibit the contact decomposition of the electrolyte and the surface of an electrode under the high-temperature condition and improve the high-temperature effect of the battery when being matched with the lithium salt, the solvent and other additives.
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. In the present description and claims, range limitations may be combined and/or interchanged, including all sub-ranges contained therein if not otherwise stated.
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.
Example 1
The non-aqueous electrolyte is prepared by the following method: in a glove box, Ethylene Carbonate (EC), Propylene Carbonate (PC), diethyl carbonate (DEC) and Ethyl Methyl Carbonate (EMC) were mixed in a weight ratio of 30:10:30:30, and then lithium hexafluorophosphate was added to dissolve them, to prepare an electrolyte solution having a lithium hexafluorophosphate concentration of 1.1M. Then, vinylene carbonate accounting for 0.5% of the mass of the electrolyte, 1, 3-propane sultone accounting for 3% of the mass of the electrolyte, and a compound (1) accounting for 0.2% of the mass of the electrolyte were added to the electrolyte.
The prepared nonaqueous electrolyte solution for lithium ion batteries was injected into a fully dried 4.4V NCM (nickel: cobalt: manganese ═ 5:2: 3)/graphite pouch battery, and after the procedures of standing at 45 ℃, high-temperature jig formation, secondary sealing and the like, a battery performance test was performed to obtain the battery used in example 1.
Example 2
The preparation method of the positive electrode and the negative electrode of the embodiment 2 is the same as that of the embodiment 1; except that the compound (1) was added to the electrolyte in example 2 in an amount of 0.5% by mass of the electrolyte.
Example 3
The preparation method of the positive electrode and the negative electrode of the embodiment 3 is the same as that of the embodiment 1; except that the compound (1) was added to the electrolyte in example 3 in an amount of 1% by mass of the electrolyte.
Example 4
The preparation method of the positive electrode and the negative electrode of the embodiment 4 is the same as that of the embodiment 1; except that the compound (2) was added to the electrolyte in example 4 in an amount of 0.2% by mass of the electrolyte.
Example 5
The preparation method of the positive electrode and the negative electrode of the embodiment 5 is the same as that of the embodiment 1; except that the compound (2) was added to the electrolyte in example 5 in an amount of 0.5% by mass of the electrolyte.
Example 6
The preparation method of the positive electrode and the negative electrode of the embodiment 6 is the same as that of the embodiment 1; except that the compound (2) was added to the electrolyte in example 6 in an amount of 1% by mass of the electrolyte.
Example 7
The preparation method of the positive electrode and the negative electrode of example 7 is the same as that of example 1; except that the compound (3) was added to the electrolyte in example 7 in an amount of 0.2% by mass of the electrolyte.
Example 8
The preparation method of the positive electrode and the negative electrode of the embodiment 8 is the same as that of the embodiment 1; except that the compound (3) was added to the electrolyte in example 8 in an amount of 0.5% by mass of the electrolyte.
Example 9
The preparation method of the positive electrode and the negative electrode of example 9 is the same as that of example 1; except that the compound (3) was added to the electrolyte in example 9 in an amount of 1% by mass of the electrolyte.
Example 10
The preparation methods of the positive electrode and the negative electrode of example 10 are the same as those of example 1; except that the compound (4) was added to the electrolyte in example 10 in an amount of 0.2% by mass of the electrolyte.
Example 11
The preparation methods of the positive electrode and the negative electrode of example 11 are the same as those of example 1; except that the compound (4) was added to the electrolyte in example 11 in an amount of 0.5% by mass based on the electrolyte.
Example 12
The preparation methods of the positive electrode and the negative electrode of example 12 are the same as those of example 1; except that the compound (4) was added to the electrolyte in example 12 in an amount of 1% by mass of the electrolyte.
Example 13
The preparation methods of the positive electrode and the negative electrode of example 13 are the same as those of example 1; except that the compound (5) was added to the electrolyte in example 13 in an amount of 0.2% by mass of the electrolyte.
Example 14
The preparation methods of the positive electrode and the negative electrode of example 14 are the same as those of example 1; except that the compound (5) was added in an amount of 0.5% by mass based on the electrolyte in example 14.
Example 15
The preparation methods of the positive electrode and the negative electrode of example 15 are the same as those of example 1; except that the compound (5) was added to the electrolyte in example 15 in an amount of 1% by mass of the electrolyte.
Comparative example
The non-aqueous electrolyte is prepared by the following method: in a glove box, Ethylene Carbonate (EC), Propylene Carbonate (PC), diethyl carbonate (DEC) and Ethyl Methyl Carbonate (EMC) were mixed in a weight ratio of 30:10:30:30, and then lithium hexafluorophosphate was added to dissolve them, to prepare an electrolyte solution having a lithium hexafluorophosphate concentration of 1.1M. Then, vinylene carbonate accounting for 0.5 percent of the mass of the electrolyte and 1, 3-propane sulfonic acid lactone accounting for 3 percent of the mass of the electrolyte are added into the electrolyte.
The prepared nonaqueous electrolyte for the lithium ion battery was injected into a fully dried 4.4V NCM (nickel: cobalt: manganese ═ 5:2: 3)/graphite pouch battery, and after the procedures of standing at 45 ℃, high-temperature jig formation, secondary sealing and the like, a battery performance test was performed to obtain the battery used in comparative example 1.
TABLE 1 electrolyte formulations for the examples and comparative examples
Figure BDA0002163620280000071
Figure BDA0002163620280000081
Lithium ion battery performance testing
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:
Figure BDA0002163620280000082
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:
Figure BDA0002163620280000083
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:
Figure BDA0002163620280000084
Figure BDA0002163620280000091
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:
Figure BDA0002163620280000092
the cell performance results for the above comparative examples and examples are shown in table 2:
table 2 lithium ion battery performance test results of each comparative example and example
Figure BDA0002163620280000093
Figure BDA0002163620280000101
From the data in the table, it can be seen that when the electrolyte without the addition of the sulfur-containing lithium salt additive is used for a high-potential 4.4V-523/AG soft package battery, the effects of normal-temperature circulation, high-temperature circulation and low-temperature circulation are not superior to those of the battery with the addition of the sulfur-containing lithium salt additive electrolyte, and particularly, in the aspect of low-temperature circulation, the sulfur-containing lithium salt additive has obvious improvement on the performance of the battery. This is because the resistance of the SEI film formed by the lithium salt containing sulfur is low, while the resistance of the SEI film formed by the additives such as VC and PS is large, and the difference in these resistances is more significant in a low-temperature environment.
The cycle performance of the batteries of examples 10 to 15 at low temperature was not exhibited as that of examples 1 to 9 because the resistance of the SEI film formed by the sulfur-containing lithium salt additive was increased and the cycle performance of the batteries was lowered as the molecular weight was increased and the benzene rings were added. The sulfur-containing lithium salt with lower molecular weight is added into the electrolyte as an additive, so that the low-temperature cycle performance of the battery can be obviously improved, meanwhile, the high-temperature performance is also improved to a certain extent, and the toughness of the formed SEI film can be improved due to the existence of unsaturated bonds in the sulfur-containing lithium salt.
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. An electrolyte containing a sulfur-containing lithium salt additive, which contains a lithium salt, an organic solvent and an additive, wherein the organic solvent contains one or more of chain carbonates, cyclic carbonates and carboxylic esters, and the additive contains a sulfur-containing lithium salt compound represented by the general formula (I):
Figure FDA0002163620270000011
in the formula (I), R1Represents an unsaturated hydrocarbon group having less than 20 carbon atoms.
2. The electrolyte solution containing a lithium salt of sulfur as claimed in claim 1, wherein the compound of formula (I) comprises the following compounds:
Figure FDA0002163620270000012
preferably, the compound represented by the general formula (I) accounts for 0.1-5%, for example, 0.2-2% of the electrolyte.
3. The electrolyte of claim 1, wherein the lithium salt is selected from LiPF6、LiBF4、LiClO4、LiBOB、LiODFB、LiAsF6、LiN(SO2CF3)2、LiN(SO2F)2One or more of; preferably, the concentration of the lithium salt in the electrolyte is 0.5 to 2M, more preferably 1 to 1.5M, in terms of lithium ions.
4. The electrolyte of claim 1 or 3, wherein the lithium salt is selected from LiPF6And, in terms of lithium ions, the LiPF6The concentration in the electrolyte is 1-1.5M, for example 1.1M.
5. The electrolyte solution containing the lithium salt of sulfur-containing additive as claimed in claim 1, wherein the chain carbonate is selected from one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, dipropyl carbonate; the cyclic carbonate is selected from one or more of ethylene carbonate, vinylene carbonate and propylene carbonate; the carboxylic ester is selected from one or more of ethyl acetate, ethyl propionate, methyl acetate, propyl acetate, methyl propionate, methyl butyrate and ethyl butyrate.
6. The electrolyte containing a lithium salt of sulfur additive as claimed in claim 1, wherein the organic solvent comprises ethylene carbonate, propylene carbonate, diethyl carbonate and ethyl methyl carbonate; preferably, the organic solvent comprises ethylene carbonate, propylene carbonate, diethyl carbonate and ethyl methyl carbonate in a weight ratio of 30:10:30:30, were mixed.
7. The electrolyte of claim 1, wherein the additive further comprises one or more of fluoroethylene carbonate, 1, 3-propane sultone, ethylene carbonate, vinylene carbonate, propylene carbonate, and lithium difluorophosphate.
8. The electrolyte solution containing the additive of lithium salt of sulfur as claimed in claim 1 or 7, wherein the additive further comprises 1, 3-propane sultone and vinylene carbonate; preferably, the additive also comprises 1, 3-propane sultone accounting for 3% of the mass of the electrolyte and vinylene carbonate accounting for 0.5% of the mass of the electrolyte.
9. A lithium ion battery using the electrolyte containing the additive of a sulfur-containing lithium salt according to any one of claims 1 to 8.
10. The lithium ion battery according to claim 9, wherein the method for producing a lithium ion battery comprises injecting the nonaqueous electrolytic solution for a lithium ion battery of the present invention into a fully dried nickel: cobalt: the nickel-cobalt-manganese/graphite soft package battery with manganese being 5:2:3 is subjected to the working procedures of standing at 45 ℃, high-temperature clamp formation and secondary sealing.
CN201910740040.2A 2019-08-12 2019-08-12 Electrolyte containing sulfur-containing lithium salt additive and lithium ion battery containing electrolyte Pending CN112397782A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105074996A (en) * 2013-04-01 2015-11-18 宇部兴产株式会社 Nonaqueous electrolyte solution and electricity storage device using same
CN107394269A (en) * 2016-05-17 2017-11-24 宁德新能源科技有限公司 Electrolyte and lithium ion battery
CN109428119A (en) * 2017-08-23 2019-03-05 宁德时代新能源科技股份有限公司 Lithium ion battery and non-aqueous electrolyte thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105074996A (en) * 2013-04-01 2015-11-18 宇部兴产株式会社 Nonaqueous electrolyte solution and electricity storage device using same
CN107394269A (en) * 2016-05-17 2017-11-24 宁德新能源科技有限公司 Electrolyte and lithium ion battery
CN109428119A (en) * 2017-08-23 2019-03-05 宁德时代新能源科技股份有限公司 Lithium ion battery and non-aqueous electrolyte thereof

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