Anti-swelling silicon-based negative electrode sheet and preparation method thereof

By coating a graphite layer and setting an amorphous carbon layer on the surface of the silicon-based negative electrode material coating, the problem of silicon-based electrode expansion in lithium-ion batteries is solved, the cycle performance and initial efficiency of the battery are improved, and the full-charge rebound rate of the negative electrode sheet is reduced.

CN116314588BActive Publication Date: 2026-04-21安徽得壹能源科技有限公司
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Patent Information

Application Number
CN202310253480.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-03-13
Publication Date
2026-04-21
Estimated Expiration
2043-03-13

AI Technical Summary

Technical Problem

The expansion and contraction of silicon-based electrodes during lithiation in lithium-ion batteries due to volume changes cause rapid capacity decay. Existing technologies struggle to effectively limit the expansion of silicon-based anode materials, and the graphite layer is prone to cracking and failure.

Method used

A graphite layer is coated on the surface of the silicon-based anode material coating, and an amorphous carbon layer is placed in between. The flexibility and microporous structure of the amorphous carbon layer are used to absorb the expansion stress and alleviate the expansion of the silicon-based anode material. The graphite layer then uniformly transmits the expansion pressure through the amorphous carbon layer, preventing the graphite layer from cracking.

Benefits of technology

It effectively alleviates the expansion problem of silicon-based anode materials, improves the cycle performance and initial efficiency of the battery, reduces the full-charge rebound rate of the anode sheet, and enhances the overall performance of the lithium battery.

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Abstract

The application discloses a kind of anti-expansion silicon-based negative pole and preparation method thereof, from inside to outside including foil, lithium supplement layer attached to both sides of foil, silicon-based active material layer attached to the outside of lithium supplement layer, amorphous carbon layer attached to the outside of silicon-based active material layer and the graphite layer of outermost side;The foil is porous foil, and the hole of porous foil is filled by lithium supplement layer;The thickness of amorphous carbon layer is 20-100 μm, and the area density of amorphous layer is 0.2-5 times of the area density of silicon-based negative pole coating.
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