▎ 摘　　要

NOVELTY - Preparing lithium titanate and graphene composite involves mixing ethanol and water in a volume ratio of 1:0-0.5 and adding acid. The lithium source and the titanium source is added into the mixture liquid obtained according to the material amount ratio of 0.8-1.0:1. The two-component chelating agent is pre-mixed with water, where the volume ratio of water and chelating agent is 0.5-2:1 and mixed uniformly to obtain mixed solution. The liquid ammonia is added to adjust the pH value to 7-10 until the chelating agent is completely dissolved and then added to the mixed solution prepared. USE - Method for preparing lithium titanate and graphene composite (claimed). ADVANTAGE - The method enables to prepare lithium titanate and graphene composite, which greatly improves the conductivity of lithium titanate, improves its high-magnification performance and tightness of lithium titanate surface coating, while making the surface coating a uniform material. DETAILED DESCRIPTION - Preparing lithium titanate and graphene composite involves mixing ethanol and water in a volume ratio of 1:0-0.5 and adding acid. The lithium source and the titanium source is added into the mixture liquid obtained according to the material amount ratio of 0.8-1.0:1. The two-component chelating agent is pre-mixed with water, where the volume ratio of water and chelating agent is 0.5-2:1 and mixed uniformly to obtain mixed solution. The liquid ammonia is added to adjust the pH value to 7-10 until the chelating agent is completely dissolved and then added to the mixed solution prepared. The obtained mixture is stirred uniformly into a sol to obtain a lithium titanate precursor. The graphene powder is added to the lithium titanate precursor sol under the ultrasonic condition, where the mass ratio of graphene powder and the lithium titanate precursor sol is 1-30:100. The obtained solution is subjected to suction filtration, washed, dried and finally sintered for 4-24 hours under inert atmosphere at 600-800 degrees C. The product obtained is cooled to obtain lithium titanate and graphene composite. An INDEPENDENT CLAIM is included for method for graphene powder preparation, which involves: (A) preparing graphite oxide solution by using the Hummers method, by using the primary and secondary oxidation method of graphite raw material; (B) adding a high-boiling organic solvent in the graphite oxide solution and then adding a reducing agent, where the ratio of graphite oxide solution, high-boiling organic solvent and reducing agent is 100-1000:25-500:5-100; and (C) filtering and freeze-drying to obtain graphene powder.