▎ 摘　　要

NOVELTY - A lithium titanate-graphene composite electrode material preparing method involves dissolving a lithium source and a titanium source in ethanol. Acetic acid is added to the dissolved product, heated and agitated. The obtained powder is calcined and grinded to obtain nano-lithium titanate powder. Natural squama graphite and sodium nitrate are mixed with concentrated sulfuric acid and agitated. Potassium permanganate is slowly added to react in the ice water and continuously agitated. The prepared nano-lithium titanate powder and oxidized graphite are evenly mixed and calcined. USE - Method for preparing a lithium titanate-graphene composite electrode material (claimed) that is utilized for a lithium ion battery in a portable electronic device and electric car. ADVANTAGE - The method enables preparing the lithium titanate-graphene composite electrode material in an easy and economical manner with improved multiplying power performance and high specific capacity. DETAILED DESCRIPTION - A lithium titanate-graphene composite electrode material preparing method involves dissolving a lithium source and a titanium source in ethanol. Acetic acid is added to the dissolved product, heated to 40-100 degrees C and agitated for 4-10 hours at constant temperature. The obtained product is dried at 80-120 degrees C, dispersed in deionized water and dried. The obtained powder is calcined for 6-18 hours at 700-1000 degrees C and grinded to obtain a nano-lithium titanate powder. Natural squama graphite and sodium nitrate are mixed with concentrated sulfuric acid and agitated for 10-20 minutes in ice water. Potassium permanganate is slowly added to react for 0.5-1 hour in the ice water and continuously agitated for 24 to 48 hours at 20-25 degrees C. The agitated product is added into deionized water and the aquae hydrogenii dioxide to react for 10-20 minutes and centrifuged. The separated product is washed using a mixed solution of sulfuric acid and aquae hydrogenii dioxide, and deionised water, and centrifuged and dried via vacuum to obtain oxidized graphite. The prepared nano-lithium titanate powder and oxidized graphite are evenly mixed and calcined for 3-10 minutes at 700-1100 degrees C.