A multi-stage buffered silicon-carbon electrode active material and electrode for lithium batteries

By using a multi-level buffer structure and nitrogen-doped silicon-carbon electrode active material, the structural instability of silicon-carbon electrodes in lithium batteries caused by volume expansion and side reactions has been solved, resulting in better cycle performance and energy storage effect.

CN117133895BActive Publication Date: 2026-07-24DONGGUAN AOZON ELECTRONICS MATERIAL +2
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Patent Information

Application Number
CN202311151358.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-09-07
Publication Date
2026-07-24
Estimated Expiration
2043-09-07

AI Technical Summary

Technical Problem

Existing silicon-carbon electrode active materials suffer from structural cracking due to the volume expansion of silicon in lithium batteries, resulting in poor conductivity. Furthermore, they exhibit numerous side reactions upon contact with the electrolyte, leading to insufficient cycle stability.

Method used

The silicon-carbon electrode active material with a multi-level buffer structure includes hollow silicon-carbon material and hard carbon and soft carbon coating layers. It is prepared by coaxial electrospinning process to form a hollow porous silicon-carbon nanofiber structure with hard carbon coating, and nitrogen element is doped to improve structural stability and conductivity.

Benefits of technology

It effectively reduces volume change, minimizes side reactions, improves the structural stability and cycle performance of materials, and enhances the energy storage efficiency and cycle performance of batteries.

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Abstract

The application discloses a kind of multistage buffering silicon-carbon electrode active material and electrode for lithium battery, which comprises a substrate and a coating layer coated on the surface of the substrate, the coating layer has at least two layers, and the outer side of the hard carbon coating layer is wrapped with a soft carbon coating layer.The substrate comprises a hollow silicon-carbon material.The application adopts two aspects of improvement: first, the hollow structure in the hollow silicon-carbon material;Second, the hard carbon coating layer;The above two aspects work together to provide sufficient buffer space for the volume expansion of silicon, making the silicon-carbon electrode active material have good structural stability and can better overcome the structural collapse caused by silicon expansion.The silicon-carbon electrode active material is coated with soft carbon, which reduces the direct contact between silicon and electrolyte, reduces the occurrence of side reactions, and improves the electrical conductivity.
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Citation Information

Patent Citations

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