▎ 摘　　要

NOVELTY - Preparing power lithium-ion battery cathode material comprises preparing porous metal oxide, or preparing porous fast lithium-ion conductor, loading fast lithium-ion conductor into the porous-channel metal oxide, or loading the porous metal oxide into porous-channel fast lithium-ion conductor to prepare metal oxide/fast lithium-ion conductor, coating thin carbon layer on the outer surface of metal oxide/fast lithium-ion conductor and performing carbothermic reduction simultaneously to prepare metal oxide/fast lithium-ion conductor- thin carbon layer, and reacting with phosphate, selenide or telluride to obtain phosphide or selenide or telluride of germanium or tin/fast lithium-ion conductor- thin carbon layer as a anchored on the surface of the graphene sheet. USE - The method is useful for preparing power lithium-ion battery cathode material. ADVANTAGE - The method: solves the problems of large volume change, fast capacity decay and low first coulomb efficiency in the existing method in a targeted manner through the structural design of graphene/carbon co-coating and ion conductor modification. DETAILED DESCRIPTION - Preparing power lithium-ion battery cathode material comprises preparing porous metal oxide (MOx), or preparing porous fast lithium-ion conductor, loading fast lithium-ion conductor into the porous-channel metal oxide, or loading the porous metal oxide into porous-channel fast lithium-ion conductor to prepare metal oxide/fast lithium-ion conductor, coating thin carbon layer on the outer surface of metal oxide/fast lithium-ion conductor and performing carbothermic reduction simultaneously to prepare metal oxide/fast lithium-ion conductor-thin carbon layer, and reacting with phosphate, selenide or telluride to obtain phosphide or selenide or telluride of germanium or tin/fast lithium-ion conductor-thin carbon layer as anchored on the surface of the graphene sheet. M = Ge or Sn; and x = integer.