▎ 摘　　要

NOVELTY - Preparing silicon-carbon composite material comprises uniformly dispersing nano-silicon, graphite, organic cracking carbon source and nano-conductive agent by a dispersant to obtain a precursor, sintering the precursor, drying, carbonizing, crushing, and sieving to prepare a silicon-carbon composite material for the cathode of lithium-ion batteries, where in this preparation method, the ratio between the first reversible capacity of the silicon-carbon composite material and the specific surface area of the graphite is required to be between 280-330. The nano-silicon and organic solvent are made into nano-silicon slurry. The dispersant is low-carbon alcohols, ethers, organic acids, esters, citric acid, ethyl oleate mixture, n-butanol and glyceryl monostearate. The nano-conductive agent is graphene, carbon nano-tube, carbon black, carbon nano-fiber, nano-graphite and/or nano-active carbon. USE - The composite material is useful for lithium-ion battery cathode (claimed). ADVANTAGE - The silicon-carbon composite cathode material has cathode first reversible capacity, the first coulomb efficiency, and cycle performance effect.