An electrode plate with improved surface flatness, a preparation method thereof, and a battery

By recoating and isostatically pressing the electrode surface, the problem of uneven electrode surface is solved, improving the interface contact effect and battery performance of solid-state batteries, especially cycle stability.

CN117712277BActive Publication Date: 2026-07-21CHONGQING TALENT NEW ENERGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHONGQING TALENT NEW ENERGY CO LTD
Filing Date
2023-12-26
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

In solid-state batteries, uneven electrode surfaces lead to insufficient contact with the solid electrolyte, increasing interfacial impedance and affecting battery performance, especially cycle stability.

Method used

A recoating process is performed on the existing coating layer of the electrode using gravure coating and isostatic pressing. A slurry with a particle size smaller than that of the original coating layer is used to form a recoating layer, which improves the surface smoothness and compaction density of the electrode and avoids defects caused by rolling.

Benefits of technology

It effectively reduces interface impedance, increases the contact area between the electrode and the solid electrolyte, improves the cycle stability and electronic conductivity of the battery, and improves the solid-solid interface contact state.

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Abstract

The present application belongs to the field of batteries. The present application provides a kind of pole piece for improving surface flatness, its preparation method and battery, the preparation method includes that the coating layer of pole piece has formed is carried out re-coating, the mode of re-coating is gravure coating, control the particle size of substance in slurry used in re-coating is less than the particle size of substance in the coating layer that has formed, then carries out isostatic pressing treatment, forms re-coating layer.The specific re-coating layer formed by isostatic pressing treatment of the present application can prevent the generation of internal and surface defects of pole piece caused by roll pressing, improve the surface roughness and thickness uniformity of pole piece, effectively improve the surface flatness of pole piece and reduce interface impedance, optimize the solid-solid contact state and effect of electrode active material and solid electrolyte in pole piece, and further improve the cycle stability of battery.
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