Electrolytes, lithium secondary batteries, and power consumption devices

The electrolyte additives with trimethylsilyl and ester groups form stable films at the cathode and anode interfaces, addressing side reactions and improving lithium-ion battery performance by reducing DCR and enhancing power and cycle performance.

JP2026518424APending Publication Date: 2026-06-08CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
JP Β· JP
Patent Type
Applications
Current Assignee / Owner
CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
Filing Date
2023-11-22
Publication Date
2026-06-08

AI Technical Summary

Technical Problem

Existing lithium-ion batteries face issues with side reactions at the cathode and anode interfaces during the charge-discharge cycle, leading to increased DCR, reduced power performance, and decreased cycle and storage performance due to the accumulation of electrolyte decomposition products and consumption of active lithium.

Method used

An electrolyte composition for lithium secondary batteries comprising additives with trimethylsilyl, lithium ion, and ester groups to form dense, stable interfacial films at the cathode and anode interfaces, suppressing side reactions and enhancing film formation.

Benefits of technology

The electrolyte composition effectively reduces initial DCR, improves power performance, and enhances cycle and storage performance by preventing electrolyte decomposition and lithium consumption.

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Abstract

This application provides an electrolyte, a lithium secondary battery, and a power consumption device. The electrolyte includes additives, the additives including a first additive containing a trimethylsilyl group, a second additive containing lithium ions, and a third additive containing an ester group. This application demonstrates that by adding three types of additives to the electrolyte, the initial DCR of the battery can be effectively reduced, the initial power performance can be improved, and the cycle performance and storage performance of the battery can be improved.
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