▎ 摘　　要

NOVELTY - A silicon-based composite cathode material comprises a mixture of silicon dioxide (4) and silicon crystal grain (5) as substrate, where surface of substrate is coated with a lithium silicate layer (3), an indefinite carbon layer (2), and a graphene layer (1) from inside to outside in turn. USE - A silicon-based composite cathode material for lithium-ion battery. ADVANTAGE - The structure of the lithium silicate layer, the amorphous carbon layer, and the graphene layer of the surface relieves the internal stress generated by volume change in the lithiation process of silicon oxide, maintaining the stability of the material structure, and at the same time, forming an ion transport channel and an electron transport channel, so that the material has good electrochemical performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparation of silicon-based composite cathode material which involves ball-milling carboxylic acid organic matter and lithium compound to form slurry, adding silicon oxide particles into the slurry and stirring uniformly, calcining mixed material under inert atmosphere to obtain a precursor, placing precursor in inert atmosphere, raising the temperature to 1000-1300degrees Celsius, and introducing the mixed gas of carbon source gas and hydrogen to react to obtain the product. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a silicon-based composite cathode material. Graphene layer (1) Indefinite carbon layer (2) Lithium silicate layer (3) Silicon dioxide (4) Silicon crystal grain (5)