Silicon-based anode material and preparation method thereof

Abstract

A silicon-based anode material and a preparation method thereof are provided. The silicon-based anode material includes a silicon-based core and a coating layer, the silicon-based core includes nano silicon and a lithium-containing silicon oxide, and the coating layer at least includes a polymer layer with —Si—O—Si— bonds. The preparation method of a silicon-based anode material includes (I) preparing a silicon-based core; and (II) coating a polymer layer. The silicon-based anode material includes high initial Coulombic efficiency and initial lithium intercalation capacity. The polymer layer with —Si—O—Si— bonds in the coating layer is insoluble in water, which avoid problems such as slurry sedimentation and poor coating performance, making the silicon-based anode material have good processing performance.

Dependencies are inferred from the claim text.