▎ 摘　　要

NOVELTY - A silicon composite negative electrode material has a core-shell structure comprising a silicon-based material as inner core, and an intermediate layer and an outer shell layer sequentially coated on the outer surface of the inner core. The intermediate layer includes carbon nanomaterials loaded with metal elements, and the outer shell layer includes amorphous carbon materials. USE - Silicon composite negative electrode material used for secondary battery (claimed). ADVANTAGE - The silicon composite negative electrode material has excellent specific capacity and structural stability and high ion and electron transfer efficiency, which can effectively improve the electrochemical performance of the battery such as energy density, cycle life, and safety. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) preparation of the silicon composite negative electrode material, which involves: (a) preparing carbon nanomaterials loaded with metal elements; (b) obtaining silicon-based material, and forming coating intermediate layer on the surface of the silicon-based material with the carbon nanomaterial loaded with metal elements to obtain an intermediate product; and (c) preparing shell layer of amorphous carbon material on the outer surface of the intermediate product; and (2) a secondary battery, which has a negative electrode sheet containing the silicon composite negative electrode material. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the silicon composite negative electrode material. (Drawing includes non-English language text).