▎ 摘　　要

NOVELTY - Silicon-based composite negative electrode material includes secondary ball particles and conductive materials. The secondary spherical particles are prepared from raw materials including silicon and water-soluble high molecular polymers. The conductive material is coated on the outside of the secondary ball particles or dispersed in the inside of the secondary ball particles. USE - Silicon-based composite negative electrode material for negative electrode (Claimed). ADVANTAGE - The silicon-based composite negative electrode material has high specific capacity, first-time coulombic efficiency, better cycle performance and rate performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing a silicon-based composite negative electrode material, when the conductive material is coated on the outside of the secondary spherical particles, involves dispersing silicon and water-soluble high molecular polymer uniformly in water to form a mixed aqueous solution, and spray drying mixed aqueous solution and granulating to obtain secondary spherical particles, and mixing the secondary spherical particles with a conductive material to obtain a silicon-based composite negative electrode material, and when the conductive material is dispersed inside the secondary spherical particles, involves dispersing silicon, water-soluble polymer and conductive material in water to form a mixed aqueous solution, and spray-drying mixed aqueous solution and granulating to prepare a silicon-based composite negative electrode material; and (2) a method for preparing a negative electrode, which involves mixing silicon-based composite negative electrode material with water or an aqueous binder solution to prepare a slurry, which is uniformly stirring and coating on the surface of the negative electrode current collector, and obtaining the negative electrode after drying.