▎ 摘　　要

NOVELTY - Preparing graphene material comprises (i) dispersing graphite in aqueous mixed solution of tetrahydrofuran, (ii) adding perchloric acid and lithium nitrate into the resulting mixed solution, and mixing, (iii) carrying out ultrasonic process on the mixed liquid, (iv) after completing ultrasonic processing, separating product by centrifugal separation, using deionized water for washing the product, and then using isopropyl alcohol for washing to obtain the graphene material. USE - The method is useful for preparing graphene material (claimed). ADVANTAGE - The method: is simple; has high production efficiency, high yielding capacity and good graphene dispersibility; and further prepares nano-composite metal anti-corrosion coating material with stable performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for the graphene material prepared by the above mentioned method, where the thickness of the graphene material is less than 20 nm, and the graphene material is easily dispersed in an organic solvent