▎ 摘　　要

NOVELTY - Graphene/carbon-coated silicon-based cathode comprises a silicon-based material, amorphous carbon coated on the surface of the silicon-based material and graphene. The preparation method includes adding a dopamine hydrochloride solution into a reaction kettle. The silicon-based material is added into the reaction kettle while stirring, adjusted the pH value of the solution to 8.5 after uniformly stirring, continuously stirred for 10-24 hours, cleaned for multiple times, and dried to obtain a poly-dopamine-coated silicon-based material. The graphene oxide is dispersed into deionized water to prepare graphene oxide dispersion liquid, added the poly-dopamine-coated silicon-based material into the graphene oxide dispersion liquid, raised the temperature to 40-80℃, stirred for 5-12 hours, and washed with deionized water for several times to obtain a graphene oxide/poly-dopamine-coated silicon-based material. USE - Graphene/carbon-coated silicon-based cathode. ADVANTAGE - The graphene/carbon-coated silicon-based cathode effectively realizes the uniform coating, effectively inhibits volume expansion effect of the silicon-based materials, improves the electronic conductivity of the material and the long-term cycle performance of lithium-ion batteries. The preparation method is simple and convenient and is easy to realize large-scale and industrialization. DETAILED DESCRIPTION - Graphene/carbon-coated silicon-based cathode comprises a silicon-based material, amorphous carbon coated on the surface of the silicon-based material and graphene. The preparation method includes adding a dopamine hydrochloride solution into a reaction kettle. The silicon-based material is added into the reaction kettle while stirring, adjusted the pH value of the solution to 8.5 after uniformly stirring, continuously stirred for 10-24 hours, cleaned for multiple times, and dried to obtain a poly-dopamine-coated silicon-based material. The graphene oxide is dispersed into deionized water to prepare graphene oxide dispersion liquid, added the poly-dopamine-coated silicon-based material into the graphene oxide dispersion liquid, raised the temperature to 40-80℃, stirred for 5-12 hours, and washed with deionized water for several times to obtain a graphene oxide/poly-dopamine-coated silicon-based material. The graphene oxide/poly-dopamine coated silicon-based material is placed in a tubular furnace, raised the temperature to a certain temperature at a certain heating rate for 1-5 hours.