▎ 摘　　要

NOVELTY - Preparing composite material comprises dispersing the cathode material and the nitrogen-containing cationic surfactant in water to obtain a first dispersion, dispersing graphene and anionic surfactant in water to obtain a second dispersion, mixing and processing the first dispersion liquid and the second dispersion liquid, and drying to obtain a precursor, calcining the precursor to obtain the composite material, where the composite material is a cathode material covered with nitrogen-doped graphene. USE - The method is useful for preparing composite material. ADVANTAGE - The material is not easy to fall off and has good coating effect on the cathode material. The method is simple and easy to control, and has good repeatability, good application prospect and high yield and adjusts the electrochemical performance of the composite material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for composite material prepared by the above mentioned method.