▎ 摘　　要

NOVELTY - The preparation of composite material involves adding mixture of two different metal element (A) and metal element (B) to graphene solution, mixing with aqueous ammonia solution and hydrogen peroxide solution, stirring the mixture uniformly, adding in hydrothermal reactor lining cup in set temperature environment, extracting the precipitate after setting the time interval of the reaction to obtain spinel phase of binary transition metal oxide and reduced grained graphene composite. USE - Preparation of composite material (claimed) used for lithium battery cathode material. ADVANTAGE - The method enables preparation of composite material without needing high temperature sintering, achieves high safety and non-toxic effect of product, and improves the lithium battery cycle performance and rate performance. DETAILED DESCRIPTION - - The preparation of composite material involves adding mixture of two different metal element (A) and metal element (B) to graphene solution, mixing with aqueous ammonia solution and hydrogen peroxide solution, stirring the mixture uniformly, adding in hydrothermal reactor lining cup in set temperature environment, extracting the precipitate after setting the time interval of the reaction to obtain spinel phase of binary transition metal oxide and reduced grained graphene composite (AB2O4/rGO), where metal element A is metal element having at valence of +2, and metal element B is metal element having valence of +2 and +3. An INDEPENDENT CLAIM is included for composite material.