NOVELTY - Preparation of lithium titanate hexafluoride involves making suspension of titanium dioxide by adding titanium dioxide powder (15-25%) to pure water; heating and stirring, adding hydrofluoric acid (60-70%) to get transparent hexafluorotitanic acid solution; making lithium carbonate suspension by adding lithium carbonate powder (20-30%) to pure water; adding hydrofluoric acid (60-70%), filtering lithium suspension, washing to give lithium fluoride, preparing lithium fluoride suspension (20-30%); mixing lithium fluoride suspension with transparent hexafluorotitanic acid.    USE - For preparation of lithium titanate hexafluoride used in lithium ion battery (claimed).    ADVANTAGE - The synthesized lithium titanate hexafluoride has high purity, when it is applied to a solution containing lithium hexafluorophosphate electrolyte battery, the battery electrolyte conductivity significantly enhanced, thus improving battery performance.    DETAILED DESCRIPTION - Preparation of lithium titanate hexafluoride involves 1) making suspension of titanium dioxide by adding titanium dioxide powder (15-25%) to pure water; heating the suspension and stirring, adding hydrofluoric acid (60-70%) to the titanium dioxide suspension to get transparent hexafluorotitanic acid (H2TiF6) solution; 2) making lithium carbonate suspension by adding lithium carbonate powder (20-30%) to pure water; under heating and stirring, adding hydrofluoric acid (60-70%) to lithium carbonate suspension to obtain the lithium suspension, filtering the lithium suspension, washing the filter cake by pure water to give lithium fluoride, preparing lithium fluoride suspension (20-30%) by adding lithium fluoride to pure water; 3) mixing lithium fluoride suspension with transparent hexafluorotitanic acid to give transparent fluorine titanate solution; 4) stirring and heating transparent lithium titanate solution, water evaporation, concentrating solution of lithium hexafluorotitanate solution, filtering, washing the filter cake with pure water, heating the crystal and drying in polytetrafluoroethylene (PTFE) plate, naturally cooling, grinding and crushing, to obtain lithium titanate hexafluoride powder. A lithium battery electrolyte solution was prepared by mixing the lithium titanate hexafluoride and lithium hexafluorophosphate. In the electrolyte solution, the lithium hexafluorophosphate acts as main electrolyte, and lithium titanate hexafluoride acts as accessorial electrolyte. The mol ratio of lithium titanate hexafluoride to lithium hexafluorophosphate is 10:1-10:2. The organic solvent used in the lithium battery electrolyte is ethylene carbonate, diethyl carbonate, dimethyl carbonate, propylene carbonate and/or methyl ethyl carbonate.