▎ 摘　　要

NOVELTY - Silicon-based cathode material, is claimed. The cathode material has egg-type multilayer structure, including: silicon-based cathode material layer; and functional layer formed on the surface of the silicon-based cathode material layer by coupling; functional layer is composed of graphene hybrid layer/hydrophilic layer/cross-linked M-O layer/hydrophilic layer from the surface to the inside; M is zirconium, titanium, silicon, manganese, nickel, cobalt, aluminum, chromium, magnesium, calcium, zinc, and/or iron. USE - Used as silicon-based cathode material. ADVANTAGE - The silicon-based cathode material: has surface coupling functional layer, excellent cycle performance, and good repeatability; and is simple to prepare and economical. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the silicon-based cathode material comprising (i) placing a blank silicon-based cathode material in aqueous solution of dopamine, stirring, and filtering; (ii) preparing a solution containing M alkoxide (1-100 μM/L), adding the material obtained by filtering in step (i) to the M-containing alkoxide solution, stirring, and filtering; (iii) adding the material obtained by filtering in step (ii) into the dopamine aqueous solution, stirring, and filtering; and (iv) preparing a graphene hybrid solution (1-5 wt.%), adding the material obtained by filtering in step (iii) into the graphene hybrid solution, stirring for 5-10 minutes, and filtering; vacuum drying at 80-100℃, heat preservation time is 0.5-48 hours.