▎ 摘　　要

NOVELTY - A composite material comprises graphene loaded with regular morphology and iron cobalt oxide nano-spherical particles, where the average particle size of iron cobalt oxide is 50-200 nm, specific surface area of the composite material is 1.76-64 m2/g, and iron-cobalt oxide is cobalt ferrite (CoFe2O4). USE - Composite material used for lithium ion battery negative electrode material (claimed). ADVANTAGE - The composite material has uniform and controllable particle size distribution, is environment-friendly, and has simple preparation process and excellent electrochemical properties. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of composite material comprising weighing graphene oxide powder, adding to water, and fully mixing; dissolving trivalent iron salt, divalent cobalt salt, ascorbic acid, and hydrazine monohydrate in water and sodium acetate, adding to product in first step, and reacting; hydrothermal reacting; and washing with hot water and drying.