Electrolyte additive, electrolyte, and battery

The electrolyte additive optimizes SEI and CEI films in lithium-ion and sodium-ion batteries, addressing fast-charging and high-temperature performance issues by reducing impedance and maintaining film stability, thus improving battery performance and longevity.

WO2026114264A1PCT designated stage Publication Date: 2026-06-04GUANGZHOU TINCI MATERIALS TECH
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
GUANGZHOU TINCI MATERIALS TECH
Filing Date
2025-11-26
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

Lithium-ion and sodium-ion batteries face challenges in fast-charging performance and high-temperature cycling performance due to rapid temperature rise during charging, leading to performance degradation and reduced service life.

Method used

An electrolyte additive comprising a first additive and a second additive, which optimize the formation of solid electrolyte interphase (SEI) and cathode-electrolyte interphase (CEI) films, reducing initial impedance and enhancing film stability at high temperatures, thereby improving fast-charging and high-temperature cycling performance.

Benefits of technology

The electrolyte additive significantly reduces battery impedance, enhances lithium-ion and sodium-ion battery charging rates, and maintains film stability under high-temperature conditions, extending battery life and performance.

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Abstract

Provided are an electrolyte additive, an electrolyte, and a battery. The electrolyte additive includes a first additive and a second additive. The first additive includes a compound represented by Formula 1, where R1 and R2 are each independently selected from at least one of H, phenyl, halogen, C1 to C6 hydrocarbyl, C1 to C6 halogenated hydrocarbyl, Formula 3, Formula 4 or Formula 5, and R1 and R2 are not both H; and R3, R4, and R5 are each independently selected from at least one of C1 to C3 alkylene, oxygen atom, O=S=O, C=O, or S=O, at least one of R3, R4, or R5 is selected from O=S=O, C=O, and S=O, and at least one of R3, R4, or R5 is selected from the oxygen atom. The second additive includes a compound represented by Formula 2.
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