An electrolyte and a battery comprising the same

By using functional additives A and B to form a polymer protective layer in lithium-ion batteries, the problems of positive electrode material breakage and electrolyte ingress under high voltage are solved, improving the battery's high-temperature cycle and storage performance and extending battery life.

CN114976248BActive Publication Date: 2026-07-17ZHUHAI COSMX BATTERY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHUHAI COSMX BATTERY CO LTD
Filing Date
2022-06-17
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Under high voltage, the positive electrode material of lithium-ion batteries is prone to breakage and shedding during long-term charge-discharge cycles. Electrolyte enters the interior of the positive electrode material, damaging its structure, leading to battery capacity decay and deterioration at high temperatures.

Method used

By employing functional additives A and B with specific structures, a polymer layer is formed on the surface of the positive electrode material, preventing the electrolyte from directly contacting the positive electrode material. Through the electrochemical oxidation polymerization of additive A and its reaction with trace amounts of water in the electrolyte, a protective layer is formed, enhancing the battery's high-temperature cycle and storage performance.

Benefits of technology

It significantly improves the high-temperature cycle performance and storage performance of lithium-ion batteries, enhances the structural stability of cathode materials, and extends battery life.

✦ Generated by Eureka AI based on patent content.

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    Figure CN114976248B_ABST
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Abstract

The application provides an electrolyte and a battery comprising the electrolyte, wherein the electrolyte comprises an additive A, the additive A is at least one of compounds shown in formula (1) and / or formula (2): the additive A in the electrolyte can be electrochemically oxidized to form a polymerization monomer capable of being polymerized into a ring, and further undergo a polymerization reaction to generate a polymer layer on the surface of a positive electrode material, the polymer layer can effectively isolate the direct contact between the electrolyte and the positive electrode material. In the process of charging and discharging of the battery, the additive B can be coated on the polymer layer, and cooperates with the additive A to jointly prevent the electrolyte from entering the positive electrode material to corrode the positive electrode active material, so that the battery has excellent high-temperature cycle performance and high-temperature storage performance.
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