Preparation method of high-energy-density silicon carbon/mesocarbon microsphere composite material

The invention relates to the technical field of lithium ion batteries, and provides a preparation method of a high-energy-density silicon carbon/mesocarbon microsphere composite material, which comprises the following steps: S1, adding a carbon-based material into an organic solvent, and uniformly dispersing to obtain a mixed solution; s2, adding carboxylated nano silicon, a silane coupling agent and a graphene oxide solution into the mixed solution, uniformly dispersing, heating to 300-500 DEG C, carrying out polymerization reaction, filtering and drying to obtain a first precursor material; s3, heating the first precursor material to 500-800 DEG C, introducing a mixed gas of an oxidizing gas and an inert gas, carrying out a heat preservation reaction, cooling to room temperature in an inert atmosphere, and carrying out mechanical extrusion and classification to obtain a second precursor material; and S4, carrying out vapor deposition on the second precursor material in mixed gas of organic gas and inert gas