▎ 摘　　要

NOVELTY - Preparing hard carbon-soft carbon-fast ion conductor composite material involves weighing the lignin, starch, rare earth coupling agent, crosslinking agent, and graphene oxide solution with a mass ratio of 30-70: 30-70: 1-10: 1-10: 50-500 to disperse uniformly, passing hydrothermal reaction, filtering, freezing and drying to prepare hard carbon precursor composite materials. The hard carbon precursor composite material is mixed with the fast ion conductor solution, and the fast ion conductor doped hard carbon material is prepared by hydrothermal reaction, weighing the fast ionic conductor hard carbon material and asphalt, crushing and mixing uniformly, under the protection of inert gas, raising the temperature to 700-1000℃ at a heating rate of 1-10℃/min, heat preserving for 1-6 hours, reducing to room temperature, obtaining the hard carbon-soft carbon-fast ion conductor composite material. USE - Method for preparing hard carbon-soft carbon-fast ion conductor composite material. ADVANTAGE - The method coats fast ion conductors and soft carbon materials sequentially on the outer layer of hard carbon doped rare earth compounds by hydrothermal method, and prepares hard carbon soft carbon fast ion conductor composite materials with high specific capacity, high initial efficiency and good power performance.