Electrolyte additive, composition for high-voltage electrolyte, high-voltage electrolyte and preparation method thereof, lithium ion battery

By using a high-voltage electrolyte with a specific composition of electrolyte additives and organic solvents in lithium-ion batteries, the problem of easy oxidation of traditional electrolytes under high voltage has been solved, achieving better oxidation stability and cycle performance.

CN120149543BActive Publication Date: 2025-11-21HU ZHOU YAO NING GU TAI DIAN CHI YAN JIU YUAN YOU XIAN GONG SI
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Patent Information

Application Number
CN202510225838.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-02-27
Publication Date
2025-11-21
Estimated Expiration
2045-02-27

AI Technical Summary

Technical Problem

Traditional electrolytes are prone to oxidation and decomposition under high voltage, which leads to the degradation of the cycle performance of high-voltage cathode materials. Existing technologies are difficult to adapt to high-voltage material systems above 4.6V.

Method used

An electrolyte additive consisting of propyltriethynyl phosphate, triethyl borate or tripropyl phosphate, and 3-aminopropyltriethoxysilane in a mass ratio of 1:(0.2-1.5):(0.2-2) is combined with lithium salt and a specific proportion of organic solvent to form a high-voltage electrolyte, which is prepared by stirring and mixing.

Benefits of technology

It improves the oxidation stability of the electrolyte, reduces the dissolution of cathode material ions, inhibits the dissolution of transition metals, and extends the cycle life and storage performance of lithium-ion batteries, making it suitable for 5V high-voltage systems.

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Abstract

The application relates to the technical field of electrolyte, and discloses an electrolyte additive, a composition for high-voltage electrolyte, a high-voltage electrolyte, a preparation method of the high-voltage electrolyte and a lithium ion battery. The additive contains component A, component B and component C in a mass ratio of 1:(0.2-1.5):(0.2-2); the component A is tripropargyl phosphate; the component B is at least one selected from triethyl borate, tripropyl borate and tributyl borate; and the component C is at least one selected from 3-aminopropyl triethoxysilane, 1,3-divinyl tetramethyldisiloxane, trimethoxy (3,3,3-trifluoropropyl) silane and triethoxy (pentafluorophenyl) silane. The electrolyte additive has an excellent application prospect in the field of high-voltage electrolyte. The high-voltage electrolyte is stable and resistant to oxidation, and can be applied in a high-voltage range of 3.0-5.0 V.
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