▎ 摘　　要

NOVELTY - Preparing graphene coated silicon-carbon composite cathode material involves making nano-silicon particles, pre-passing argon/hydrogen gas for 15-25 min, with gas flow rate of 0.1-2 l/min. 8-12g of commercial silicon particles are sent into the grinding tank from the feed port, 150-190 ml of acetone is injected into the grinding tank through the feed port, and the feed port is sealed with a rubber stopper, and the buckle is fastened. The rotation speed to 2200-2700 rpm. The recovered samples are placed in vacuum drying oven and set the temperature to 70-80 degrees C for vacuum drying. Mechanical mixing method involves adding graphene and nano-silicon particles to absolute ethanol at a mass ratio of 1:1, stirring by magnetic force for 1.5-2.5 hours, sonicating for 1.5-2.5 hours, vacuum filtration, and then vacuum filtration. The obtained product is dried under vacuum conditions of 70-90 degrees C for 10-20 h. The obtained black powder is graphene-coated silicon-carbon composite anode material. USE - Method for preparing graphene coated silicon-carbon composite cathode material. ADVANTAGE - The method enables to prepare graphene coated silicon-carbon composite cathode material which effectively improves the specific capacity of the Si-based material and the cycle performance under low current density, and satisfies the needs of use.