Preparation method of nanometer silicon/graphene lithium ion battery negative electrode material

The invention discloses a preparation method of a nanometer silicon/graphene lithium ion battery negative electrode material, and belongs to the technical field of new energy materials and electrochemistry. The preparation method comprises the following steps: firstly, treating silicon nanoparticles by using HF/HNO3 mixed acid to obtain Si-H surfaces, then carrying out hydrosilylation reaction on the silicon nanoparticles subjected to surface treatment by using a plurality of carbonaceous organic matters containing double bonds or triple bonds, and finally, directly mixing graphene with the silicon nanoparticles subjected to hydrosilylation reaction, and drying to obtain the graphene/Si-H composite material. The nanometer silicon/graphene negative electrode material is obtained. According to the preparation method of the nanometer silicon/graphene lithium ion battery negative electrode material, on one hand, the silicon nanoparticles are adopted, so that the problem of volume expansion of silicon is effective