▎ 摘　　要

NOVELTY - Composite material with hollow four-shell structure comprises reduced graphene oxide and three metal oxides i.e. zinc-manganese-cobalt oxides (Zn0.5Mn0.5Co2O4). The composite material is microspheres with hollow four-shell structure and graphene sheet structure. The hollow four-shell structure consists of four shells from the outside to the inside, with gaps between each shell. USE - The composite material is useful for preparing lithium-ion battery (claimed). ADVANTAGE - The composite material: provides enough ion and electron transport channels and free space to alleviate the problems of volume expansion stress and structural collapse in the process of lithium storage because of the large space and the gap between the shell layers; at the same time, the complex internal hollow structure provides rich reaction sites; provides cathode material with excellent electrochemical performance for the lithium-ion battery; and exhibits excellent cycle stability, rate performance and high specific capacity. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: preparing the composite material with hollow four-shell structure; lithium-ion battery cathode; and lithium-ion battery.