Method for preparing microcrystalline graphene through ball milling

The invention discloses a method for preparing microcrystalline graphene through ball milling, and belongs to the field of preparation of functional materials. The method comprises: firstly performing shock-heating and shock-cooling processing on microcrystalline graphene, then performing ball milling, and doping nitrogen in the ball milling process, so as to obtain the nitrogen-doped microcrystalline graphene material. The method is simple in technology, strong in operation controllability and stable in product quality. Microcrystalline graphene can be directly used as a raw material, which is wide in source and low in price and suitable for large-scale production. The prepared nitrogen-doped microcrystalline graphene possesses the characteristics of being fluffy, light in mass and large in specific surface area. Because of doping of nitrogen atom, active site is increased, the energy level of the carbon structure is changed, and the prepared microcrystalline graphene is suitable for preparing high-capacity good-rate-capability lithium ion cathode materials.