▎ 摘　　要

NOVELTY - The preparation method of the high-strength silicon alloy lithium battery negative electrode material involves: mixing 15-25 wt.% of a metal powder, 30-40 wt.% of silicon nano powder, 20-30 wt.% of a carbon material, 15-25 wt.% of polyacrylonitrile fiber and 5-10 wt.% of gelan, and crushing into a mixture A; grinding the mixture A and adding 5-10 wt,% of dimethylacetamide in the grinding process to obtain a mixture B; coating the mixture B on a copper foil; carrying out vacuum drying on the copper foil loaded with the mixture B; obtaining an electrode sheet; and carrying out thermal decomposition treatment on the electrode sheet; and annealing the electrode sheet subjected to the thermal decomposition treatment to reduce the temperature of the electrode sheet to room temperature. The metal powder comprises nickel, iron, copper or cobalt. The carbon material is graphene, carbon nanotubes or conductive graphite. The grinding beads used in grinding process are zirconia. USE - Preparation method of the high-strength silicon alloy lithium battery negative electrode material. ADVANTAGE - The prepared negative electrode material has high mechanical strength due to the adoption of a novel current collector crushing and grinding technology. The mixed binder is adopted, so that the rapid reduction of the battery performance caused by the volume change of silicon can be effectively relieved, and a new reference way is provided for the preparation of the electrode with low cost and electrochemical performance. The polyacrylonitrile fiber and the graphene conductive agent which are formed by pyrolysis can be uniformly distributed on the surface of the nano silicon particle, and the graphene around the silicon particle has higher mechanical elasticity and is beneficial to adapting to obvious volume change.