Electrochemical device and electrolyte

By using hard carbon and graphite anode active materials and low-viscosity carboxylic acid ester solvent with the first additive to form an SEI film in the electrochemical device, the structural instability problem caused by fast charging is solved, and the battery achieves fast charging and long cycle performance.

CN122224973APending Publication Date: 2026-06-16BEIJING CHEHEJIA AUTOMOBILE TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING CHEHEJIA AUTOMOBILE TECH CO LTD
Filing Date
2024-12-16
Publication Date
2026-06-16

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Abstract

The application relates to an electrochemical device and an electrolyte. The electrochemical device comprises an electrolyte, a positive electrode sheet, a negative electrode sheet and a separator film between the positive electrode sheet and the negative electrode sheet, wherein the negative electrode sheet comprises a negative electrode current collector and a negative electrode film layer arranged on at least one surface of the negative electrode current collector, the negative electrode film layer comprises a negative electrode active material, the negative electrode active material comprises graphite and hard carbon, the electrolyte comprises a first additive and an organic solvent, the organic solvent comprises a carboxylic acid ester solvent, the reduction potential of the first additive to lithium is less than 1.3 V, and the mass fraction of the first additive in the electrolyte is 2.5% to 8%. The electrochemical device can balance the rapid charging performance and the cycle performance.
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