Electrolyte and sodium ion battery

By using sodium bis(fluorosulfonyl)imide and the first additive in the electrolyte, a stable interfacial film is formed, which solves the problems of low energy density and poor cycle stability of sodium-ion batteries, improves the high-temperature and room-temperature performance and low-temperature discharge performance of the battery, and enhances the stability and safety of the battery.

CN122000457APending Publication Date: 2026-05-08GUANGZHOU TINCI MATERIALS TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGZHOU TINCI MATERIALS TECH
Filing Date
2024-11-06
Publication Date
2026-05-08

AI Technical Summary

Technical Problem

Sodium-ion batteries have low energy density and poor cycle stability. Conventional electrolytes have poor thermal stability, which leads to surface oxidation and decomposition at high voltages, affecting capacity and cycle performance.

Method used

An electrolyte containing sodium bis(fluorosulfonyl)imide and a first additive is used to improve the operating voltage, suppress the increase in impedance, and improve the high-temperature and room-temperature cycling performance, low-temperature discharge performance, and low-impedance characteristics by forming a stable interface film.

Benefits of technology

Under high pressure conditions, the electrolyte significantly improves the high-temperature storage performance, high-temperature and room-temperature cycling performance, low-temperature discharge performance, and low-impedance characteristics of sodium-ion batteries, thereby enhancing the stability and safety of the batteries.

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Abstract

The invention provides an electrolyte and a sodium ion battery. The electrolyte comprises a sodium salt and a first additive, the sodium salt comprises sodium bis (fluorosulfonyl) imide; the first additive has a structure as shown in a formula 1, m represents any integer from 1 to 12, R1, R2 and R3 are respectively and independently at least one of C1-C8 alkyl, C1-C8 alkoxy, C2-C8 alkenyl or C2-C8 alkynyl, and one or two of R1, R2 and R3 are C1-C8 alkoxy. The electrolyte provided by the invention can effectively improve the working voltage and the stability of an SEI film, so that the high-temperature storage performance, the high-temperature and normal-temperature cycle performance, the low-temperature discharge performance and the low-impedance characteristic of the sodium-ion battery are improved.
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