Methods for preparing silicon-based anode materials

Abstract

A method for preparing a silicon-based anode material includes granulating a thermosetting polymer with a dispersion containing silicon suboxide powder and a solvent to obtain microparticles, and subjecting the microparticles to a carbonization process to obtain the silicon-based anode material. Granulation includes dissolving the thermosetting polymer in the dispersion, coating it with silicon suboxide powder, and then thermally curing it. The microparticles contain silicon suboxide powder and a polymer shell formed by the thermal curing of the thermosetting polymer and coating the silicon suboxide powder. Carbonization transforms the polymer shell into a carbonized shell composed of carbon. By using a thermosetting polymer and performing granulation followed by carbonization, the silicon suboxide powder in the silicon-based anode material can be uniformly and completely coated by a carbonized shell with good conductivity. Therefore, when the silicon-based anode material is used in lithium-ion batteries, the lithium-ion batteries exhibit excellent cycle life.

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