Silicon-carbon composite material, method for preparing the same, and lithium ion battery comprising the same

By constructing a non-smooth three-dimensional undulating texture on the surface of silicon-carbon composite material, the volume expansion problem of silicon-based anodes during charging and discharging is solved, the mechanical strength and electrochemical performance of the electrode are improved, and high cycle stability and high rate performance of lithium-ion batteries are achieved.

CN122117875APending Publication Date: 2026-05-29LANXI ZHIDE ADVANCED MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LANXI ZHIDE ADVANCED MATERIALS CO LTD
Filing Date
2026-04-27
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing silicon-based anode materials suffer from pulverization, SEI film rupture, and electrode peeling during charge and discharge due to high volume expansion, which affects the cycle stability and mechanical properties of the battery, making it difficult to balance electrochemical performance and electrode mechanical performance.

Method used

A spherical silicon-carbon composite material is used, with a non-smooth three-dimensional undulating texture on the surface consisting of continuous or unequally spaced conical, folded, or long plate-shaped ridges. Silicon and carbon layers are in situ coated on the porous carbon surface by chemical vapor deposition, forming an adaptive stress buffer structure and optimized ion migration channels.

Benefits of technology

It effectively alleviates the volume expansion stress of silicon, increases the contact area between the electrode and the electrolyte, enhances the mechanical interlocking effect, improves cycle stability and rate performance, and achieves high specific capacity while improving the overall electrochemical kinetics of the material.

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Abstract

The application provides a silicon-carbon composite material and a preparation method thereof and a lithium ion battery containing the same, relates to the technical field of lithium ion batteries, and the silicon-carbon composite material is a spherical particle, the surface of the particle has a non-smooth three-dimensional undulating special texture composed of continuous, non-equidistant or both arranged conical ridges, folded ridge ridges or long flake-shaped ridges, and the special texture is at least one selected from lotus-leaf-shaped texture, wrinkle-shaped texture and walnut shell-shaped texture. The above-mentioned silicon-carbon composite material of the application effectively relieves the volume expansion stress in the charging and discharging process of the material through the micro-buffer space formed on the surface; meanwhile, the contact area of the electrode / electrolyte is increased, the charge transfer resistance is reduced, and the lithium ion transmission kinetics is improved; meanwhile, the three-dimensional undulating morphology can also produce strong mechanical interlocking with the binder, and the electrode peeling strength is significantly improved. The silicon-carbon composite material of the application can be widely applied to the negative active material of a lithium ion battery.
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