▎ 摘　　要

NOVELTY - Modified lithium titanate cathode material, is claimed. The modified lithium titanate cathode material has granular structure, the outer layer of the granular body is grapheme composite aluminum hydroxide secondary coating layer, the secondary coating layer of graphene composite aluminum hydroxide is coated with secondary lithium titanate particles, the secondary lithium titanate particle is formed by agglomerating multiple primary lithium titanate grain. USE - Used as modified lithium titanate cathode material. ADVANTAGE - The cathode material: improves conductivity of the surface of the secondary particles, high temperature performance of the battery, and characteristics of poor processing performance of the nanoparticles. The lithium titanate battery: achieves continuous charging at a rate of 40C and excellent continuous rate discharge at a rate of 50C to meet application requirements in a hybrid vehicle. DETAILED DESCRIPTION - Modified lithium titanate cathode material, is claimed. The modified lithium titanate cathode material has granular structure, the outer layer of the granular body is grapheme composite aluminum hydroxide secondary coating layer, the secondary coating layer of graphene composite aluminum hydroxide is coated with secondary lithium titanate particles, the secondary lithium titanate particle is formed by agglomerating multiple primary lithium titanate grain, the outer layer of each primary lithium titanate grain is primary coating layer of graphene, and the secondary coating of graphene composite aluminum hydroxide is aluminum hydroxide particles distributed in islands shape. An INDEPENDENT CLAIM is also included for preparing modified lithium titanate cathode material, comprising (a) taking 97-99.8 wt.% lithium titanate material of particle size 20-500 nm, 0.1-2 wt.% (by graphene dry powder) graphene dispersion, 0.1-1 wt.% polyethylene glycol and solvent NMP, adding into sand mill mixer, ball mill mixing for 2-5 hours to obtain well-dispersed slurry of nano-sized lithium titanate particles and grapheme, (b) spray granulating the mixed slurry by spray drier to obtain secondary lithium titanate particle precursor agglomerated into spherical particles of primary lithium titanate particles, (c) sintering secondary lithium titanate particle precursor in furnace under nitrogen inert gas at 300-500 degrees C for 1-5 hours to prevent the secondary lithium titanate particle precursor from cracking, (d) taking 97.5-99.9 wt.% sintered secondary particles of lithium titanate precursor, 0.05-2 wt.% graphene powder, and 0.05-0.5 wt.% aluminum hydroxide powder, performing fusion for 0.5-2 hours using fusion machine to make graphite, the olefin composite aluminum hydroxide uniformly covers the surface of the secondary lithium titanate particles, where the particle size of the aluminum hydroxide powder is 20-200 nm, and (e) vacuum-packing the fusion-processed particulate material in an oven at low temperature of 100 degrees C for greater than or equal to 2 hours to obtain modified lithium titanate cathode material coated with graphene aluminum hydroxide. An INDEPENDENT CLAIM is also included for lithium titanate battery containing modified lithium titanate cathode material, comprising a cathode pole piece, a anode pole piece by roll pressing, slitting, and performing lamination and isolation film after cutting into an electric core, where the cathode pole piece preparation comprises taking 85-95 wt.% secondary graphene coated lithium titanate cathode material, 2-10 wt.% conductive agent and 2-10 wt.% caking agent, mixing, adding into high speed stirring machine, dispersing uniformly in N-methyl pyrrolidone solvent, stirring at high speed and dispersing for 2-20 hours, vacuumizing, sieving to obtain anode slurry, coating the anode slurry on lithium ion battery using coating machine for the aluminum current collector with thickness of 10-20 mu m, baking to obtain cathode pole piece, the anode pole piece preparation comprises taking 85-95 wt.% anode active material, 1-8 wt.% conductive agent and 1-5 wt.% binder, adding into high speed stirring disperser, dispersing uniformly in N-methyl pyrrolidone solvent, after high speed stirring and dispersing for 2-10 hours, vacuumizing, sieving to obtain anode slurry, coating the anode slurry on aluminum current collector using coating machine at thickness of 12-20 mu m, and baking to obtain the anode pole piece. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the structure of modified lithium titanate cathode material.