▎ 摘　　要

NOVELTY - Silicon-carbon composite negative electrode material comprises a silicon/graphite composite core, which has multiple layers of flake graphite and nano silicon, where the flake graphite is arranged in an oriented manner, the nano silicon is positioned between the flake graphite and forms a sandwich structure, gaps of particles in the silicon/graphite composite core are filled with carbon materials, and the particles comprise the flake graphite and the nano silicon, and a carbon layer is coated outside the silicon/graphite composite core. USE - Silicon-carbon composite negative electrode material with high compact structure. ADVANTAGE - The material has high density and high strength, and improves cycle ability and volume energy density, when silicon-carbon composite negative electrode is applied to a battery. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing silicon-carbon composite negative electrode material with a high compact structure, which involves: (1) dispersing nano silicon and flake graphite in a solvent, or dispersing a composition of the nano silicon, the flake graphite and other carbon materials in the solvent, adding a binder after ultrasonic treatment, and uniformly mixing to obtain silicon/graphite slurry; (2) coating the silicon/graphite slurry on a high molecular substrate by a tape casting method, and drying to obtain a sheet material with the high molecular substrate and the silicon/graphite coating; (3) stacking multiple sheet materials to obtain a silicon/graphite blank; (4) placing the silicon/graphite blank obtained in the step into a sintering furnace for roasting to obtain a silicon/graphite sintered blank; (5) crushing and shaping the silicon/graphite sintered blank to obtain silicon/graphite composite particles; (6) carrying out surface carbon coating treatment on the silicon/graphite composite particles; (7) depolymerizing and sieving the material to obtain the silicon-carbon composite negative electrode material.