CN111384442B - Positive electrode film forming additive for battery electrolyte, electrolyte using additive and lithium ion battery - Google Patents
Positive electrode film forming additive for battery electrolyte, electrolyte using additive and lithium ion battery Download PDFInfo
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- CN111384442B CN111384442B CN201910158857.9A CN201910158857A CN111384442B CN 111384442 B CN111384442 B CN 111384442B CN 201910158857 A CN201910158857 A CN 201910158857A CN 111384442 B CN111384442 B CN 111384442B
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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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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C255/00—Carboxylic acid nitriles
- C07C255/01—Carboxylic acid nitriles having cyano groups bound to acyclic carbon atoms
- C07C255/15—Carboxylic acid nitriles having cyano groups bound to acyclic carbon atoms containing cyano groups and singly-bound oxygen atoms bound to the same unsaturated acyclic carbon skeleton
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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
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
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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
- H01M2300/0088—Composites
- H01M2300/0091—Composites in the form of mixtures
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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 an additive applied to battery electrolyte, which has the structure shown in the following (I),the substituent is shown in the specification. The invention also provides an electrolyte and a battery using the additive. The additive provided by the invention can form a stable CEI film on the surface of the positive electrode, and improves the cycle performance of the battery at high voltage.
Description
Technical Field
The invention belongs to the field of lithium ion battery electrolyte, and relates to an additive for lithium ion battery electrolyte, and an electrolyte and a lithium ion battery using the additive.
Background
The lithium ion battery has the advantages of high energy density, long cycle life, high working voltage, small self-discharge, no memory effect and the like, and is widely applied to the fields of 3C, energy storage, power batteries and the like. Longer cycle life, higher energy density, faster rate capability, wider use temperatures, lower price costs, etc., are important directions for the development of lithium ion batteries.
Increasing battery energy density may be achieved by increasing battery charge cutoff voltage, for example: increasing the operating voltage of existing battery systems, e.g. LiCoO 2 And NMC ternary battery systems, with a battery specific capacity increase of approximately 8% and an energy density increase of approximately 10% for each 0.1V increase in charge voltage; a novel battery system was developed. LiCoPO 4 (4.8V)、LiNi 0.5 Mn 1.5 O 4 (4.7V)、Li 2 CoPO 4 F(5.1V)、LiNiPO 4 The positive electrode material such as (5.1V) can be stably circulated at a high voltage.
However, when the operating voltage exceeds the electrochemical window (< 4.3V) of conventional carbonate electrolytes, a series of problems are caused, such as: electrolyte is easy to be oxidized and decomposed on the surface of the positive electrode under high voltage, so that high interface impedance and battery capacity attenuation are caused; the dissolution of metal cations in the electrolyte under high voltage can cause the damage of the anode structure, and the cycling stability of the battery is affected; the metal cations dissolved in the electrolyte can be precipitated as metal dendrites on the graphite cathode, which affects the safety of the battery. Therefore, inhibiting side reactions at the positive electrode/electrolyte interface at high voltages is a key measure to improve the performance of high voltage lithium ion batteries.
To suppress the interface of positive electrode and electrolyte at high voltageIt is necessary to construct a stable positive electrode/electrolyte interface. Including positive electrode protection and the use of electrolyte additives, are currently in use. Positive electrode protection, e.g. by using some inorganic compounds (AlPO 4 ，TiO 2 ，AlF 3 Etc.) to coat the surface of the positive electrode and inhibit the dissolution of metal elements in the positive electrode material and the oxidation of the electrolyte at high voltage, but the coating layer generally has higher impedance, resulting in increased battery polarization and reduced rate performance. The electrolyte additive, i.e., the adapted electrolyte additive, is used to form a good interfacial film at the positive electrode. There is no electrolyte additive that is particularly suitable for forming a good interfacial film at the positive electrode.
Therefore, further research into positive film forming additives for lithium ion batteries is necessary.
Disclosure of Invention
The invention aims to provide a battery electrolyte additive, which has the following structural formula (I):
wherein:
r1 and R2 are independently selected from C1-C20 alkyl, C2-C20 alkenyl, C1-C20 haloalkyl, C2-C20 haloalkenyl, C6-C20 aryl and C6-C20 haloaryl.
The invention provides a compound shown in a structural formula (I), wherein substituent groups R1 and R2 are independently selected from C1-C20 alkyl, C2-C20 alkenyl, C1-C20 haloalkyl, C2-C20 haloalkenyl, C6-C20 aryl and C6-C20 haloaryl.
Preferably, the substituents R1, R2 are independently selected from the group consisting of C1-C12 alkyl, C2-C12 alkenyl, C1-C12 haloalkyl, C2-C12 haloalkenyl, C6-C12 aryl, C6-C12 haloaryl.
It is further preferred that the substituents R1, R2 are independently selected from C1-C6 alkyl, C2-C6 alkenyl, C1-C6 haloalkyl, C2-C6 haloalkenyl.
Most preferably, the substituents R1, R2 are independently selected from C1-C3 alkyl, C2-C3 alkenyl, C1-C3 haloalkyl, C2-C3 haloalkenyl.
The battery electrolyte additive shown in the structural formula (I) is suitable for being used as an anode film forming additive in battery electrolyte.
When the compound of the structural formula (I) according to the present invention is used as a positive electrode film-forming additive, the positive electrode of the battery is preferably LiNi 0.5 Co 0.2 Mn 0.3 O 2 Lithium cobaltate, liNi 0.5 Mn 1.5 O 4 Or Li (lithium) 1.13 [Ni 0.2 Co 0.2 Mn 0.47 ]O 2 。
The invention also provides lithium ion battery electrolyte which contains the compound shown in the structural formula (I).
When the lithium ion battery electrolyte contains the compound shown in the structural formula (I), the content of the compound shown in the structural formula (I) in the lithium ion battery electrolyte is preferably 0.02% -2%. It is further preferable that the content of the compound represented by the structural formula (I) in the lithium ion battery electrolyte is 0.1% to 1%.
The lithium ion battery electrolyte provided by the invention can further contain lithium salt, an organic solvent and an additive besides the compound shown in the structural formula (I), namely: the lithium ion battery electrolyte contains lithium salt, an organic solvent, an additive and a compound shown in a structural formula (I).
The lithium salt used in the lithium ion battery electrolyte provided by the invention can be common lithium salt in the field. Preferably, the lithium salt is selected from LiBF 4 、LiPF 6 、LiFSI、LiTFSI、LiAsF 6 、LiClO 4 、LiSO 3 CF 3 、LiC 2 O 4 BC 2 O 4 、LiF 2 BC 2 O 4 、LiDTI、LiPO 2 F 2 At least one of them.
The organic solvent used in the lithium ion battery electrolyte provided by the invention can be an organic solvent commonly used in the field. Preferably, the organic solvent is selected from at least one of carbonate, phosphate, carboxylate, ether, nitrile and sulfone solvents.
The additive used in the lithium ion battery electrolyte provided by the invention can be an additive which is helpful for improving the performance of the electrolyte. Preferably, the additive is selected from at least one of a negative film-forming additive, a water-removing additive, a positive film-forming additive, a conductivity-enhancing additive, a wettability-improving additive, and a flame retardant additive. It is further preferred that the additive is selected from at least one of biphenyl, vinylene Carbonate (VC), fluoroethylene carbonate, ethylene carbonate, propylene sulfite, butylene sulfite, 1, 3-Propane Sultone (PS), 1, 4-butane sultone, 1,3- (1-propylene) sultone, ethylene sulfite, vinyl sulfate, cyclohexylbenzene, tris (trimethylsilane) borate (TMSB), tris (trimethylsilane) phosphate, t-butylbenzene, succinonitrile, ethylene glycol bis (propionitrile) ether, and succinic anhydride. Still more preferably, the additive is selected from the group consisting of a compound represented by the structural formula (I) and at least one selected from the group consisting of vinylene carbonate, 1, 3-propane sulfonate, tris (trimethylsilane) borate, fluoroethylene carbonate and ethylene carbonate. Most preferably, the additive is selected from the group consisting of a compound represented by structural formula (I) and at least one selected from the group consisting of vinylene carbonate, 1, 3-propane sulfonate lactone and tris (trimethylsilane) borate.
When the lithium ion battery electrolyte of the present invention contains a lithium salt, an organic solvent, an additive and a compound represented by the structural formula (I), the contents of the lithium salt, the organic solvent, the additive and the compound represented by the structural formula (I) in the electrolyte should be capable of improving the performance of the battery. Preferably, in the lithium ion battery electrolyte, the content of lithium salt is 5-15%, the content of organic solvent is 72-95%, the content of additive is 0.2-10%, and the content of compound shown in structural formula (I) is 0.1% -5%.
The invention also provides a lithium ion battery, which contains the electrolyte. In addition to containing the above electrolyte, the lithium ion battery of the present invention also contains other common components of the lithium ion battery described in the art.
The compound shown in the structural formula (I) provided by the invention has the following advantages when being used in battery electrolyte compared with the prior art:
the invention provides a novel positive electrode film forming additive, which is subjected to oxidative decomposition before a solvent, and decomposition products are deposited on the surfaces of positive electrode materials such as lithium cobaltate, nickel cobalt manganese, nickel manganese, lithium-rich manganese base and the like, so that the service performance of a battery can be effectively improved.
Drawings
FIG. 1 is an LSV curve of the electrolyte prepared in example 1 and comparative example 1.
Fig. 2 is an ac impedance spectrum after 2 weeks of cycle of NCM 523/lithium metal half-cell assembled from the electrolytes prepared in example 1 and comparative example 1, respectively.
Detailed Description
The invention will be further illustrated with reference to the following specific examples, without limiting the invention to these specific embodiments. It will be appreciated by those skilled in the art that the invention encompasses all alternatives, modifications and equivalents as may be included within the scope of the claims.
1. Electrolyte formulation and battery performance testing
Example 1
(1) Preparation of electrolyte
Mixing Ethylene Carbonate (EC), diethyl carbonate (DEC) and methyl ethyl carbonate (EMC) according to a mass ratio of 3:2:5, and then adding lithium hexafluorophosphate (LiPF 6 ) To a molar concentration of 1mol/L, 1% of compound 1 by weight of the total mass of the electrolyte was added. The structural formula of the compound 1 is as follows:
(2) Preparation of positive plate
Mixing anode active material lithium nickel cobalt manganese oxide LiNi according to the mass ratio of 93:4:3 0.5 Co 0.2 Mn 0.3 O 2 Conductive carbon black Super-P and a binder polyvinylidene fluoride (PVDF) and then dispersed in N-methyl-2-pyrrolidone (NMP) to obtain a positive electrode slurry. Uniformly coating the slurry on the aluminum foilDrying, calendaring and vacuum drying the two surfaces of the positive plate, and welding an aluminum outgoing line by an ultrasonic welder to obtain the positive plate.
(3) Preparation of negative plate
The negative electrode active material artificial graphite, conductive carbon black Super-P, binder Styrene Butadiene Rubber (SBR) and carboxymethyl cellulose (CMC) are mixed according to the mass ratio of 92:2:3:3, and then dispersed in deionized water to obtain a negative electrode slurry. Coating the slurry on two sides of a copper foil, drying, calendaring and vacuum drying, and welding a nickel outgoing line by an ultrasonic welding machine to obtain a negative plate.
(4) Preparation of the cell
And placing a polyethylene microporous membrane with the thickness of 20 mu m between the positive plate and the negative plate as a diaphragm, winding a sandwich structure formed by the positive plate, the negative plate and the diaphragm, leading out the tab, and packaging in an aluminum plastic film to obtain the battery cell to be injected with the liquid.
(5) Injection and formation of battery cell
The electrolyte prepared above was injected into the cell in a glove box with a moisture of less than 10ppm, the amount of electrolyte being such as to fill the voids in the cell. Then the method comprises the following steps: 0.01C constant current charge 30min,0.02C constant current charge 60min,0.05C constant current charge 90min,0.1C constant current charge 240min, then rest for 1hr, shaping and sealing, then further charge to 4.40V with 0.2C constant current, rest for 24hr at normal temperature, and discharge to 3.0V with 0.2C constant current.
(6) Cycle performance test
Constant current charging to 4.40V at a current of 1C and then constant voltage charging to a current falling to 0.1C, and then constant current discharging to 3.0V at a current of 1C were performed, and the cycle was continued for 300 weeks, and discharge capacity at week 1 and discharge capacity at week 300 were recorded.
The capacity retention is calculated according to the following formula:
capacity retention = 300 th week discharge capacity/1 st week discharge capacity x 100%.
Example 2
In the preparation of the electrolyte, 1% of compound 1 was changed to 0.5% of compound 1, and the data of the normal temperature cycle performance obtained by the test are shown in table 1, except that the same procedure as in example 1 was adopted.
Example 3
In the preparation of the electrolyte, 1% of compound 1 was changed to 2% of compound 1, and the data of the normal temperature cycle performance obtained by the test in the same manner as in example 1 were shown in table 1.
Example 4
In the preparation of the electrolyte, 1% of compound 1 was changed to 1% of compound 2, and the data of the normal temperature cycle performance obtained by the test in the same manner as in example 1 were shown in table 1. Compound 2 has the structural formula:
example 5
In the preparation of the electrolyte, 1% of compound 1 was changed to 1% of compound 3, and the data of the normal temperature cycle performance obtained by the test in the same manner as in example 1 were shown in table 1. Compound 3 has the structural formula:
example 6
In the preparation of the electrolyte, 1% of compound 1 was changed to 1% of compound 4, and the data of the normal temperature cycle performance obtained by the test in the same manner as in example 1 are shown in table 1. Compound 4 has the structural formula:
example 7
In the preparation of the electrolyte, 1% of compound 1 was changed to 1% of compound 5, and the data of the normal temperature cycle performance obtained by the test in the same manner as in example 1 were shown in table 1. Compound 5 has the structural formula:
example 8
In the preparation of the electrolyte, 1% of compound 1 was changed to 1% of compound 1+1% of vc (vinylene carbonate), and the data of the normal temperature cycle performance obtained by the test in the same manner as in example 1 are shown in table 1.
Example 9
In the preparation of the electrolyte, 1% of compound 1 was changed to 1% of compound 1+1% of vc+1% of ps (1, 3-propane sultone), and the data of the normal temperature cycle performance obtained by the test in the same manner as in example 1 were shown in table 1.
Example 10
In the preparation of the positive electrode, liNi 0.5 Co 0.2 Mn 0.3 O 2 The test results of the normal temperature cycle performance are shown in Table 1, except that the test results were changed to lithium cobaltate in the same manner as in example 1.
Example 11
In the preparation of the positive electrode, liNi 0.5 Co 0.2 Mn 0.3 O 2 Change to LiNi 0.5 Mn 1.5 O 4 The positive electrode was subjected to the same test as in example 1, and the data of the normal temperature cycle performance obtained by the test are shown in Table 1.
Example 12
In the preparation of the positive electrode, liNi 0.5 Co 0.2 Mn 0.3 O 2 Replacement to lithium-rich manganese-based positive electrode material Li 1.13 [Ni 0.2 Co 0.2 Mn 0.47 ]O 2 The data of the normal temperature cycle performance obtained by the test are shown in Table 1, in the same manner as in example 1.
Comparative example 1
1% of the compound 1 was removed in the preparation of the electrolyte, and the data of the normal temperature cycle performance obtained by the test in the same manner as in example 1 were shown in Table 1.
Comparative example 2
The data of the normal temperature cycle performance obtained by the test, except that 1% of the compound was changed to 1% of VC in the preparation of the electrolyte, are shown in Table 1.
Comparative example 3
In the preparation of the electrolyte, 1% of the compound was replaced with 1% of VC and 1% of PS, and the data of the normal temperature cycle performance obtained by the test in the same manner as in example 1 are shown in table 1.
Comparative example 4
In the preparation of the electrolyte, 1% of compound 1 was replaced with 1% of TMSB (tris (trimethylsilane) borate), and the data of the normal temperature cycle performance obtained by the test in the same manner as in example 1 were shown in table 1.
Comparative example 5
Removing 1% of compound in preparation of electrolyte, and preparing LiNi in preparation of positive electrode 0.5 Co 0.2 Mn 0.3 O 2 Replacement to LiCoO 2 The data of the normal temperature cycle performance obtained by the test are shown in Table 1, in the same manner as in example 1.
Comparative example 6
Removing 1% of compound in preparation of electrolyte, and preparing LiNi in preparation of positive electrode 0.5 Co 0.2 Mn 0.3 O 2 Change to LiNi 0.5 Mn 1.5 O 4 The positive electrode was subjected to the same test as in example 1, and the data of the normal temperature cycle performance obtained by the test are shown in Table 1.
Comparative example 7
Removing 1% of compound in preparation of electrolyte, and preparing LiNi in preparation of positive electrode 0.5 Co 0.2 Mn 0.3 O 2 Replacement to lithium-rich manganese-based positive electrode material Li 1.13 [Ni 0.2 Co 0.2 Mn 0.47 ]O 2 The data of the normal temperature cycle performance obtained by the test are shown in Table 1, in the same manner as in example 1.
TABLE 1
2. Positive film Forming Performance test
1. LSV Curve test
The LSV curves of the electrolytes prepared in example 1 and comparative example 1 were tested using the three electrode method (NMC 532 electrode as working electrode, metallic lithium as reference electrode and counter electrode, scan rate of 0.05 mV/s).
As can be seen from FIG. 1, the electrolyte prepared in example 1 had an oxidative decomposition initiation potential of about 4.80V and a decomposition peak of 5.2V, which indicated that compound 1 began oxidative decomposition at 4.80V, and a stable interfacial film was formed on the surface of the positive electrode material, which could significantly passivate side reactions between the electrode and the electrolyte. As can also be seen from fig. 1, after the oxidation of compound 1, the oxidation current of the electrolyte is very low, and no significant oxidative decomposition current is observed up to 6.7V, which indicates that the CEI film formed on the positive electrode surface is more stable and has better oxidation resistance.
2. AC impedance testing
The electrolytes prepared in example 1 and comparative example 1 were assembled into NCM 523/lithium metal half-cells, respectively, and ac impedance profiles of the two NCM 523/lithium metal half-cells after 2 weeks of cycling were tested, and the test results are shown in fig. 2.
As can be seen from fig. 2, the NCM 523/lithium metal half cell assembled using the electrolyte prepared in example 1 has a lower CEI membrane resistance after cycling, which indicates that the additive of structural formula (I) provided by the present invention can significantly reduce the CEI membrane resistance of the cell at high voltage, thereby improving the cycle performance of the cell at high voltage.
Claims (8)
1. The lithium ion battery electrolyte is characterized in that: the lithium ion battery electrolyte comprises lithium salt, an organic solvent, an additive, vinylene carbonate and a compound shown in a structural formula (I):
wherein: r1 and R2 are independently selected from C1-C3 alkyl; the content of the compound shown in the structural formula (I) is 0.1% -1%;
the lithium salt is selected from LiBF 4 、LiPF 6 、LiFSI、LiTFSI、LiAsF 6 、LiClO 4 、LiSO 3 CF 3 、LiC 2 O 4 BC 2 O 4 And LiF 2 BC 2 O 4 At least one of the components with the content of 5-15 percent;
the organic solvent is at least one selected from carbonic ester, phosphate ester, carboxylic ester, ethers, nitriles and sulfones, and the content is 72-95%; and the organic solvent comprises ethylene carbonate;
the additive is at least one selected from a negative electrode film-forming additive, a water removal additive, a positive electrode film-forming additive, an electrical conductivity improving additive, a wettability improving additive and a flame retardant additive, and the content is 0.2-10%;
the content of vinylene carbonate is 0.2-1%.
2. The lithium ion battery electrolyte according to claim 1, wherein: r1 is selected from methyl, ethyl or n-propyl, and R2 is selected from methyl or ethyl.
3. The lithium ion battery electrolyte according to claim 1, wherein: the compound shown in the structural formula (I) is used as an anode film forming additive.
4. The lithium ion battery electrolyte according to claim 3, wherein: the compound shown in the structural formula (I) is used as an anode film forming additive, and the anode is selected from LiNi 0.5 Co 0.2 Mn 0.3 O 2 Lithium cobaltate, liNi 0.5 Mn 1.5 O 4 Or Li (lithium) 1.13 [Ni 0.2 Co 0.2 Mn 0.47 ]O 2 。
5. The lithium ion battery electrolyte according to claim 1, wherein: the additive is selected from at least one of biphenyl, ethylene carbonate, propylene sulfite, butylene sulfite, 1, 3-propane sultone, 1, 4-butane sultone, 1,3- (1-propylene) sultone, ethylene sulfite, ethylene sulfate, cyclohexylbenzene, tris (trimethylsilane) borate, tris (trimethylsilane) phosphate, tert-butylbenzene, succinonitrile, ethylene glycol bis (propionitrile) ether and succinic anhydride.
6. The lithium ion battery electrolyte according to claim 5, wherein: the additive is at least one selected from the group consisting of 1, 3-propane sulfonate, tris (trimethylsilane) borate and ethylene carbonate.
7. The lithium ion battery electrolyte according to claim 6, wherein: the additive is selected from 1, 3-propane sulfonate lactone, and the content is 0.2-1%.
8. A lithium ion battery, characterized in that: the lithium ion battery contains the battery electrolyte as claimed in claims 1 to 7.
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| TWI777912B (en) * | 2022-06-02 | 2022-09-11 | 台灣中油股份有限公司 | Lithium-ion battery electrolyte and lithium-ion battery |
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| CN102709588A (en) * | 2012-01-12 | 2012-10-03 | 宁德新能源科技有限公司 | Lithium ion battery and electrolyte thereof |
| CN105720303A (en) * | 2014-12-05 | 2016-06-29 | 浙江蓝天环保高科技股份有限公司 | Fluoro-carboxylic ester contained electrolyte for high-voltage lithium ion battery |
| CN104852087A (en) * | 2015-04-15 | 2015-08-19 | 宁德时代新能源科技有限公司 | Electrolyte additive and lithium ion battery using the same |
| WO2017020431A1 (en) * | 2015-08-03 | 2017-02-09 | 深圳新宙邦科技股份有限公司 | Non-aqueous electrolyte of lithium-ion battery and lithium-ion battery |
| CN105762410A (en) * | 2016-04-01 | 2016-07-13 | 宁德新能源科技有限公司 | Non-aqueous electrolyte and lithium-ion battery using same |
| CN107293781A (en) * | 2016-04-11 | 2017-10-24 | 宁德新能源科技有限公司 | Electrolyte and lithium ion battery |
| CN105762413A (en) * | 2016-05-18 | 2016-07-13 | 东莞市凯欣电池材料有限公司 | Non-aqueous electrolyte solution for lithium ion battery and lithium ion battery adopting non-aqueous electrolyte solution |
| CN106025278A (en) * | 2016-07-01 | 2016-10-12 | 东莞市凯欣电池材料有限公司 | High-voltage lithium ion battery |
| CN108183260A (en) * | 2017-12-13 | 2018-06-19 | 中国科学院过程工程研究所 | A kind of electrolyte and lithium ion battery |
| CN108321434A (en) * | 2018-03-23 | 2018-07-24 | 安普瑞斯（无锡）有限公司 | A kind of high-voltage lithium-ion battery electrolyte |
| CN108666623A (en) * | 2018-05-15 | 2018-10-16 | 北京科技大学 | A kind of electrolyte of high-voltage lithium ion batteries |
| CN108987802A (en) * | 2018-06-15 | 2018-12-11 | 桑顿新能源科技有限公司 | A kind of high-voltage lithium ion batteries nonaqueous electrolytic solution |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111384442A (en) | 2020-07-07 |
| WO2020135584A1 (en) | 2020-07-02 |
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