Silicon negative electrode sheet and preparation method thereof

By combining fibrous binder and carbon felt current collector in silicon anode sheets, the problem of battery performance degradation caused by volume change of silicon-based anode materials is solved, and the cycle performance and life of the battery are improved.

CN116230912BActive Publication Date: 2026-06-19SHANGHAI XUANYI NEW ENERGY DEV CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI XUANYI NEW ENERGY DEV CO LTD
Filing Date
2023-03-20
Publication Date
2026-06-19

AI Technical Summary

⚠Technical Problem

Existing silicon-based anode materials suffer from problems such as particle breakage, electrode detachment, increased electrode polarization, rapid performance degradation, and poor cycle performance due to volume changes.

⚗Method used

An active material layer containing silicon, conductive agent and fibrous binder is combined with a current collector made of carbon felt material to prepare a silicon negative electrode sheet by hot pressing. This forms a cross-linked bonding network to improve flexibility, and the rigidity of the carbon felt material is used to suppress electrode sheet expansion and avoid electrolyte corrosion.

🎯Benefits of technology

It improves the cycle stability and lifespan of the battery, enhances the cycle performance of the battery, reduces the volume expansion effect of the material, and avoids corrosion of the current collector.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention provides a silicon anode sheet and its preparation method. The silicon anode sheet includes: an active material layer containing silicon material, a conductive agent, and a fibrous binder; and a current collector disposed on the upper and lower surfaces of the active material layer, wherein the current collector is made of carbon felt material. According to the silicon anode sheet of this invention, on the one hand, the use of a fibrous binder in the active material layer can form a cross-linked bonding network, thereby effectively improving the flexibility of the electrode sheet and overcoming the deformation and stress problems caused by the volume expansion of the active material; on the other hand, the use of carbon felt material to make the current collector on the silicon anode sheet allows its rigidity to suppress electrode expansion, improve battery life, and its chemical properties to prevent electrolyte corrosion of the current collector, thereby effectively improving the battery's cycle performance.
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