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High-voltage lithium ion battery electrolyte

A lithium-ion battery, electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the high temperature and high pressure cycle performance of electrolyte, safety performance needs to be improved, consumption of active materials, battery capacity attenuation, etc. problem, to achieve the effect of improving high temperature and high pressure cycle performance, good compatibility, and guaranteed performance

Inactive Publication Date: 2021-07-20
SHANDONG HIRONG POWER SUPPLY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In related technologies, 1,3-propane sultone (PS) and trifluoromethylphenylene sulfide (PTS) are generally used as film-forming additives, although the cycle stability of the battery at high voltage is improved to a certain extent. However, the high temperature and high pressure cycle performance and safety performance of the electrolyte still need to be improved
The electrolyte is prone to oxidative decomposition under high voltage conditions, and the gas generated by the decomposition will cause the battery to bulge. At the same time, this process consumes the active materials, resulting in poor battery performance; the oxidation products of the electrolyte will cause the transition metal elements in the positive electrode material to be released. Dissolution occurs during cycling, resulting in battery capacity decay

Method used

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preparation example Construction

[0034] The preparation method of allyl phenyl sulfide is as follows:

[0035]Put 1.5mmol of palladium catalyst into a three-necked flask, pass inert gas for protection, then add 1.5mmol of disulfide and 1.5mmol of allyl bromide, add 15mL of tetrahydrofuran, heat to 65°C, react for 48h, and the reaction product is diethyl ether Extraction and column purification.

[0036] The main chemical reaction equation is as follows:

[0037]

[0038] The obtained allyl phenyl sulfide was used in the preparation of the electrolyte solution described below.

Embodiment 1

[0040] Keep the moisture in the glove box at about 0.1ppm, and the oxygen content at about 0.1ppm, add dimethyl carbonate (DMC), ethylene carbonate (EC) and ethyl methyl carbonate (EMC) to the beaker in sequence at a volume ratio of 1:1:1 During cooling, slowly add lithium hexafluorophosphate when the temperature is not higher than 10°C, adjust the concentration to 1.2mol / L, then add 0.2wt% vinylene carbonate (VC), 5wt% fluoroethylene carbonate (FEC) and 4 wt% of 1,3-propane sultone (PS), and finally 1 wt% of allyl phenyl sulfide was added, and the stirring was continued until the solution became clear, which was carried out under the protection of nitrogen.

Embodiment 2

[0042] Keep the moisture in the glove box at about 0.1ppm, and the oxygen content at about 0.1ppm, add dimethyl carbonate (DMC), ethylene carbonate (EC) and ethyl methyl carbonate (EMC) to the beaker in sequence at a volume ratio of 1:1:1 During cooling, slowly add lithium hexafluorophosphate when the temperature is not higher than 10°C, adjust the concentration to 1.2mol / L, then add 0.2wt% vinylene carbonate (VC), 5wt% fluoroethylene carbonate (FEC), 4wt% 1,3-propane sultone (PS), and finally 3wt% allyl phenyl sulfide, and continue stirring until the solution becomes clear. This process is carried out under nitrogen protection.

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Abstract

The invention provides a high-voltage lithium ion battery electrolyte, which comprises a lithium salt, an organic solvent, a phenyl sulfide additive and other additives, the phenyl sulfide additive has a structural general formula as shown in the specification [chemical formula 1] [in the chemical formula 1], R1 is (C1-C5) alkyl, cyano, (C6-C12) aryl and (C1-C5) alkyl halogen; R2 is a (C1-C5) alkyl group or a hydrogen group; and the compound is double-bond or triple-bond. Through the technical scheme of the invention, a good electrode-interface film can be formed, and when the electrode-interface film is applied to a high-voltage lithium ion battery, the capacity retention ratio of the battery can be improved, and the cycling stability of the battery under a high-voltage condition can be remarkably improved.

Description

technical field [0001] The invention relates to the technical field of battery electrolyte, in particular to a high-voltage lithium-ion battery electrolyte. Background technique [0002] In order to meet the development and demand of electric vehicles and renewable energy, the research and development of high-voltage lithium-ion batteries is imperative. However, the development of lithium-ion batteries has a series of problems such as poor safety, severe cycle life decay, high cost, and narrow electrochemical window. The breakthrough of lithium battery technology requires the improvement of positive and negative electrode materials and electrolytes. Among them, the electrolyte has an important impact on the capacity, cycle life, and safety of lithium-ion batteries. [0003] In related technologies, 1,3-propane sultone (PS) and trifluoromethylphenylene sulfide (PTS) are generally used as film-forming additives, although the cycle stability of the battery at high voltage is i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 林红陈新赵卫民孙建勇刘永郭庆元
Owner SHANDONG HIRONG POWER SUPPLY MATERIAL
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