▎ 摘　　要

NOVELTY - A silicon negative electrode material comprises double-layer coating structure comprising core, middle layer, and outer layer arranged from the inside to the outside, where core is nano-silicon, middle layer is carbon material comprising multi-wall carbon nanotube (MWCNTs) and graphene, and outer layer is a stable lithium metal powder. USE - A silicon negative electrode material for high capacity lithium ion battery (claimed). ADVANTAGE - By adopting the method to prepare a silicon anode material with a specific structure, the volume change problem of the active anode can be effectively alleviated, and the problem of large irreversible capacity of the silicon lithium ion battery for the first time is improved. The method has a simple preparation process and controllable preparation conditions suitable for large-scale production and development, and the prepared lithium silicon battery can still circulate stably under large current density. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of silicon negative electrode material which involves (1) mixing carbon material and SDS, adding deionized water, and ultrasonically treating to prepare a dispersion; (2) dispersing paper fiber into deionized water to obtain paper fiber suspension; (3) uniformly mixing CNT conductive paper and paper fiber to obtain carbon material; (4) uniformly mixing carbon material with N-methylpyrrolidone (NMP) to prepare oily dispersion liquid; (5) mixing nano-silicon (Si) with oily dispersion liquid to prepare nano-Si suspension slurry coated on CNT conductive paper; and (6) performing stabilized lithium metal powder (SLMP) doping to obtain pre-lithiated CNT conductive paper.