▎ 摘　　要

NOVELTY - A perovskite and graphene composite material preparation method involves diluting graphene material in distilled water to obtain graphene suspension with concentration of 0.3-0.5mg/mL. The graphene suspension is added with nitrate and dispersed ultrasonically for 1-2 hours to obtain mixed solution. The resultant solution is added with citric acid and alkyl phenol polyoxyethylene ether. The pH of the solution is regulated to 8-10 by adding ammonia to obtain graphene/titanium precursor solution. The precursor solution is heated, dried and calcined. USE - Method for preparing perovskite and graphene composite material that is utilized as lithium-air battery cathode and dual-functional catalyst (claimed), and in mobile electronic devices and electric car batteries. ADVANTAGE - The method enables preparing the material with better battery charge and discharge performance, and durability. DETAILED DESCRIPTION - A perovskite and graphene composite material preparation method involves diluting graphene material in distilled water to obtain graphene suspension with concentration of 0.3-0.5mg/mL. The graphene suspension is added with nitrate and dispersed ultrasonically for 1-2 hours to obtain mixed solution. The resultant solution is added with citric acid and alkyl phenol polyoxyethylene ether. The pH of the solution is regulated to 8-10 by adding ammonia to obtain graphene/titanium precursor solution. The precursor solution is heated to 50-70 degrees C for 20-28h, dried and calcined to prepare lanthanum strontium manganite (La-1-xSrxMnO3) and graphene composite material, where x is 0-1. An INDEPENDENT CLAIM is also included for a perovskite and graphene composite material prepared by the method.