▎ 摘　　要

NOVELTY - Preparing silicon-based nanocomposite cathode material comprises (S1) mixing graphene oxide, binder, dispersant and silicon nanoparticles under a protective atmosphere, ball milling, and then adding deionized water to the mixed material to obtain a slurry, (S2) spraying the slurry and granulating by a spray granulation tower to obtain powder, (S3) calcining the powder in a reducing atmosphere to obtain a core-shell structure redox graphene-coated silicon nanocomposite, and (S4) using magnesium-doped zinc oxide as the target material, coating the surface of the redox graphene-coated silicon nanocomposite by powder magnetron sputtering coating technology, and obtaining silicon-based nanocomposite cathode material co-coated by magnesium-doped zinc oxide and redox graphene. USE - The method is useful for preparing silicon-based nanocomposite cathode material. ADVANTAGE - The silicon-based nanocomposite cathode material can not only improve the rate performance and electrical performance, but also can restrain the expansion of the nano-silicon material, slow down the crushing of the nano-silicon material, and improve the cycle performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for silicon-based nanocomposite cathode material prepared by the above preparation method.