▎ 摘　　要

NOVELTY - The production method of graphene-coated porous silicon composite negative electrode material involves: (1) weighing aluminum and silicon raw materials, and melting at temperature of 580-1200 degrees C into uniform aluminum-silicon alloy, where the mass ratio of aluminum and silicon raw materials is 1:(1-5); and (2) introducing aluminum-silicon alloy into ball mill under inert atmosphere, adding protective liquid as medium, setting a certain speed for ball milling, transferring ball-milled sample to vacuum oven, drying, and then grinding. USE - The method is useful for producing graphene-coated porous silicon composite negative electrode material (claimed). ADVANTAGE - The method enables simple and economical production of graphene-coated porous silicon composite negative electrode material with reduced energy consumption and high yield. DETAILED DESCRIPTION - The production method of graphene-coated porous silicon composite negative electrode material involves: (1) weighing aluminum and silicon raw materials, and melting at temperature of 580-1200 degrees C into uniform aluminum-silicon alloy, where the mass ratio of aluminum and silicon raw materials is 1:(1-5); (2) introducing aluminum-silicon alloy into ball mill under inert atmosphere, adding protective liquid as medium, setting a certain speed for ball milling, transferring ball-milled sample to vacuum oven, drying, and then grinding; (3) carrying out etching treatment on obtained small-particle aluminum-silicon alloy using etching agent, followed by washing and drying to obtain porous silicon material, where the mass percentage of silicon in obtained porous silicon material is 20-80%, the mass percentage of metal impurities is 20-80%, and the obtained porous silicon material has particle size distribution of 10 nm to 10 mu m, specific surface area of 10-200 m2/g, pore size distribution of 1-1000 nm and porosity of 1-90%; and (4) weighing porous silicon, graphene and carbon sources in mass ratio of 1:1:1-4:1:3, adding dispersing agent, then fully stirring to obtain mixed solution, placing mixed solution in ball milling tank according to proper ball-to-material ratio, setting the milling parameters, and spray-drying ball-milled liquid under suitable conditions to form graphene-coated porous silicon composite precursor, followed by high temperature pyrolysis to obtain product. An INDEPENDENT CLAIM is included for application method of graphene-coated porous silicon composite negative electrode material, which involves uniformly mixing graphene-coated porous silicon composite material, conductive agent and binder to prepare slurry, coating slurry on carrier fluid, and drying in vacuum oven for a certain period of time to obtain graphene-coated porous silicon negative electrode plate.