▎ 摘　　要

NOVELTY - Grading and impregnating graphite comprises filling impregnation slurry into modified graphite fiber material with graphite fiber direction, filling and replenishing impregnation slurry to inside of modified graphite fiber material, post-treating and completing impregnation. USE - The method is useful in grading and impregnating graphite for preparing graphene (claimed). ADVANTAGE - The method: provides graphite material, which has stable structure, small porosity, specific degree of flexibility, and is not easy to disintegrate and crack when graphitized; provides graphene, which has flexible high thermal conductivity, 1-1.6 g/cm3 bulk density, 5-15 W/mK thermal conductivity, 12-50 W/mk Z thermal conductivity, and 5-15% Z-direction compressibility. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: preparing graphene, comprising functionalizing graphite fiber material to obtain modified graphite fiber material, impregnating modified graphite fiber material by graphite graded impregnation method to obtain composite graphite material, reducing, hot-pressing, and graphitizing composite graphite material to obtain flexible high-thermal-conductivity graphene. graphene. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of flow chart for grading and impregnating graphite. (Drawing includes non-English language text).