Electrolyte for sodium-ion battery and preparation method thereof

By using modified additives to form a stable SEI in the electrolyte of sodium-ion batteries, the problems of flammability and performance degradation of sodium-ion batteries are solved, and good flame retardant effect and electrochemical performance improvement are achieved.

CN120749231BActive Publication Date: 2025-11-07河源市联懋新材料有限公司
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Patent Information

Application Number
CN202511133904.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-08-14
Publication Date
2025-11-07
Estimated Expiration
2045-08-14

AI Technical Summary

Technical Problem

Existing sodium-ion batteries are flammable under abuse conditions, and the commonly used flame retardant trimethyl phosphate leads to deterioration of battery performance and a decrease in capacity.

Method used

A modified additive was prepared by reacting 2-cyano-6-hydroxy-5-bromobenzothiazole with liquid bromine to generate 2-cyano-6-hydroxy-5-bromobenzothiazole, which was then substituted with diethyl chlorophosphate. Subsequently, it was coupled with trimethylsilylacetylene under the catalysis of bis(triphenylphosphine)palladium dichloride and cuprous iodide to form a modified additive. This modified additive was added to the electrolyte to form a stable solid electrolyte interface (SEI) and contained flame-retardant elements of N, S, P and Si.

Benefits of technology

It improves the flame retardancy and electrochemical performance of sodium-ion batteries, enhances capacity and cycle performance, and reduces the negative impact of flame retardants.

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Abstract

The application relates to the field of sodium ion batteries, and discloses an electrolyte for a sodium ion battery and a preparation method thereof. The electrolyte for the sodium ion battery comprises a sodium salt, an organic solvent and a composite additive. The composite additive is formed by mixing fluorinated ethylene carbonate and a modified additive at a mass ratio of 1-3:1. The modified additive is prepared by the following steps: 2-cyano-6-hydroxybenzothiazole is reacted with liquid bromine to generate 2-cyano-6-hydroxy-5-bromobenzothiazole, then a substitution reaction is performed on the phenolic hydroxyl group in the 2-cyano-6-hydroxy-5-bromobenzothiazole and diethyl chlorophosphate, and then, under the catalysis of bis-triphenylphosphine palladium dichloride and cuprous iodide, a coupling reaction is performed on the prepared 2-cyano-6-diethyl phosphate-5-bromobenzothiazole and trimethylsilylethine to generate the modified additive. The electrolyte with good flame-retardant effect is prepared by adding the modified additive, and the sodium ion battery has good capacity performance and cycle performance.
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