▎ 摘　　要

NOVELTY - Preparing nano graphene materials involves dissolving the oxidizing agent in a solvent, and then dispersing the graphite into the solution to form a graphite mixed liquid, where the concentration of the graphite mixed liquid is 10-100 grams/liter. The graphite mixed liquid is placed in a high-shear emulsifier for a first time to obtain a graphene suspension of a certain size. The obtained graphene suspension is continuously fed into a high shear emulsifier for second mechanical shearing. USE - Method for preparing nano graphene materials used in lithium battery, super capacitor, polymer composite material, heat dissipation film, functional coatings, defense industry and other fields (claimed). ADVANTAGE - The method enables to prepare high quality nano graphene materials in simple and cost-effective manner, ensures the structure of graphene from damage and is suitable for large scale production. DETAILED DESCRIPTION - Preparing nano graphene materials involves dissolving the oxidizing agent in a solvent, and then dispersing the graphite into the solution to form a graphite mixed liquid, where the concentration of the graphite mixed liquid is 10-100 grams/liter. The graphite mixed liquid is placed in a high-shear emulsifier for a first time to obtain a graphene suspension of a certain size. The graphene suspension obtained is continuously fed into a high shear emulsifier for second mechanical shearing and mixed to obtain a graphene dispersion liquid with smaller particle size and better dispersibility. The obtained graphene dispersion is continuously fed into a high-pressure homogenizer, again mixed by a high-pressure homogenizer, and the material is jetted through a high-pressure homogenizer nozzle to collide with each other, to obtain a third mechanical stripping of uniform size graphene dispersion. The graphene dispersion obtained is filtered, centrifuged and dried to obtain a nano graphene material.