▎ 摘　　要

NOVELTY - High energy density cathode composite material in which inner core is graphite and is covered by amorphous carbon/lithium-iron-cobalt-oxygen composite material (Li5Fe1-xCoXO4) to form a shell, where X = 0-0.5, is claimed. USE - Used as high energy density cathode composite material. ADVANTAGE - The method: develops internal pores of composite material; controls the parameters of the whole process by hydrothermal reaction combined with two sinterings; is simple; and has wide range of raw materials. The material: has high energy density, high initial efficiency, excellent ion conductivity and excellent structural stability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the high energy density cathode composite material.