Electrolyte and battery using same

By using electrolyte containing specific functional additives in lithium-ion batteries, the problems of interfacial instability and many side reactions in the circulation process of high-nickel positive electrode and silicon-carbon negative electrode systems are solved, and the circulation and rate performance of the battery are significantly improved.

CN119725740AActive Publication Date: 2025-03-28EVE ENERGY CO LTD
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Patent Information

Application Number
CN202411886222.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-19
Publication Date
2025-03-28
Estimated Expiration
2044-12-19

AI Technical Summary

Technical Problem

Among existing lithium-ion batteries, the high-nickel positive electrode and silicon-carbon negative electrode systems have problems such as interface instability, multiple side reactions, and capacity attenuation during the cycle process, which affects the cycle stability and rate performance of the battery.

Method used

An electrolyte containing a specific functional additive is adopted, which includes a lithium salt, an organic solvent and a functional additive. The structure of the functional additive has a large conjugated structure and a specific substituent, which can form a stable interface film on the electrode surface, reduce the interface impedance and improve the transmission efficiency of lithium ions.

Benefits of technology

By using the electrolyte in the battery, the cycle performance and rate performance of the battery are significantly improved, especially in high nickel ternary/silicon negative electrode batteries, the cycle life of the battery is extended and the overall performance of the battery is improved.

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Abstract

The invention provides an electrolyte and a battery using the same. The electrolyte comprises a lithium salt, an organic solvent and a functional additive, the structural formula of the functional additive is # imgabs0, and at least one of R1, R2, R3, R4 and R5 comprises at least one of an oxygen-containing substituent group, a cyano group-containing substituent group, an ester group-containing substituent group and a nitrogen heterocyclic ring-containing substituent group; and at least one of R6, R7, R8, R9, R10, R11, R12 and R13 comprises at least one of an oxygen-containing boron heterocyclic substituent group and a halogen substituent group. The electrolyte is beneficial to formation of uniform and compact interface films on the surfaces of positive and negative electrodes, provides stability of the interfaces of the positive and negative electrodes, reduces the side reaction degree of the interfaces of the positive and negative electrodes, and further optimizes the overall performance of the battery, especially a high-nickel ternary / silicon negative electrode battery.
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