▎ 摘　　要

NOVELTY - Preparing an in-situ heteroepitaxial graphene-coated silicon material comprises e.g. (i) using magnetic separation equipment to remove the magnetic impurities in the silicon raw material, and drying the silicon raw material; (ii) using sand milling equipment to nano-process silicon raw materials to obtain silicon particles with different particle sizes; (iii) using the in-situ low-temperature pyrolysis method to react silicon particles and fluorocarbon radicals, and carrying in-situ reaction of fluorocarbon radicals with silicon, controllable preparation of silicon-silicon carbide composite core-shell nanoparticles; (iv) using the silicon-carbon precursor as the raw material, processing first by spray drying method, and carrying low-temperature heat treatment; and (v) adding the micro-nano in-situ composite particles into a high-temperature rotary furnace, so that the micro-nano in-situ composite particles undergo in-situ heterogeneous epitaxy. USE - The method is useful for preparing an in-situ heteroepitaxial graphene-coated silicon material is useful in lithium-ion battery. ADVANTAGE - The method: uses in-situ heteroepitaxial graphene to coat the silicon material, so thus reduces cost and provides uniform carbon coating, large-scale mass production and loading application demonstration of silicon-carbon anode materials. DETAILED DESCRIPTION - Preparing an in-situ heteroepitaxial graphene-coated silicon material comprises (i) using magnetic separation equipment to remove the magnetic impurities in the silicon raw material, and drying the silicon raw material after cleaning; (ii) using sand milling equipment to nano-process silicon raw materials to obtain silicon particles with different particle sizes; (iii) using the in-situ low-temperature pyrolysis method to react silicon particles and fluorocarbon radicals, and carrying in-situ reaction of fluorocarbon radicals with silicon, controllable preparation of silicon-silicon carbide composite core-shell nanoparticles; (iv) using the silicon-carbon precursor as the raw material, processing first by spray drying method, and carrying low-temperature heat treatment, so that the silicon-carbon precursor material is made into micro-nano in-situ composite particles; and (v) adding the micro-nano in-situ composite particles into a high-temperature rotary furnace, so that the micro-nano in-situ composite particles undergo in-situ heterogeneous epitaxy.