Graphene-coated silicon material, electric arc preparation method and application thereof

The invention relates to a graphene-coated silicon material, an electric arc preparation method and application thereof, and relates to the field of lithium ion negative electrode materials, and the preparation method comprises the following steps: S1, preparing a positive electrode and a negative electrode: pressing graphite powder into the negative electrode; graphite powder and a silicon-based material are mixed, then a binder is added, the mixture is mixed evenly and pressed into an anode, and the weight ratio of the graphite powder to the silicon-based material to the binder in the anode is (1-4): (0.1-2.6): (0.125-0.4); and S2, graphene in-situ coating: applying a certain voltage between the cathode and the anode under a certain atmosphere and pressure to generate arc discharge between the cathode and the anode, so that the generated graphene in-situ coats the silicon material in the anode, and the graphene-coated silicon material is obtained. The graphene-coated silicon material is generated in situ by