▎ 摘　　要

NOVELTY - Preparation of silicon-carbon composite anode material (100) involves nanocrystallizing a silicon material in a protective environment to obtain a primary nano-silicon material, (s2) self-assembling the primary nano-silicon material with a first carbon source and a macromolecular polymer in the protective environment, (s3) adding a second carbon source for the self-assembly to obtain a secondary nano-silicon material having a layered structure, (s4) granulating the secondary nano-silicon material to obtain a spherical precursor and (s5) sintering the spherical precursor in a reducing gas or a vacuum environment at 800-1200° C. The protective environment is a vacuum environment or environment obtained by introducing an inert gas or a solvent. USE - Preparation of silicon-carbon composite anode material used in battery (all claimed) e.g. secondary battery such as lithium-ion secondary battery and sodium-ion battery. ADVANTAGE - The method is simple, easy to control and provides oxide-free, swelling-inhibited silicon-carbon composite anode material having excellent efficiency, capacitance, electrochemical performances and cycle performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: a silicon-carbon composite anode material which comprises a nano-silicon core (10), a carbon buffer layer (30) covering the nano-silicon core and a carbon conductive layer (50) covering the layer (30); and a battery which comprises an anode containing the silicon-carbon composite anode material, a cathode and a separator. DESCRIPTION OF DRAWING(S) - The drawing shows a diagrammatic view of the silicon-carbon composite anode material. 10Nano-silicon core 30Carbon buffer layer 50Carbon conductive layer 100Silicon-carbon composite anode material