NOVELTY - A lithium manganate battery material preparing method involves reacting manganese source in a doped ion source. Alkaline medium is added in the doped ion source and stirred and mixed to form ion doped manganese oxide precipitate. Ion-doped manganese oxide is obtained. Oxide is reacted with lithium hydroxide water solution. Oxide, carbon source, water and precursor salt solution are mixed and agitated to collect reaction liquid. The reaction liquid is dried to obtain an intermediate product. The intermediate product is sintered in a protective atmosphere to obtain a final product.    USE - Method for preparing lithium manganate battery material.    ADVANTAGE - The method enables preparing lithium manganate battery material having high and low temperature cycle performance and high rate discharge performance.    DETAILED DESCRIPTION - A lithium manganate battery material preparing method involves reacting manganese source in a doped ion source. Alkaline medium is added in the doped ion source and stirred and mixed to form ion doped manganese oxide precipitate. The mixed solution is heated to 50-80 degrees C under blending condition by utilizing oxidizing gas, where pH value of the solution is 6-7. Ion-doped manganese oxide is obtained. The manganese source is manganese nitrate, manganese carbonate, manganese sulfate or manganese. The doped ion is aluminum, silicon, chlorine, scandium, titanium, vanadium, chromium, iron, cobalt, nickel, copper, zinc, selenium, yttrium, zirconium, niobium, molybdenum, ruthenium, palladium, silver, indium, antimony, tin, platinum, gold, cerium or praseodymium. The oxide is chosen from nitrate, sulfate, oxalate or hydroxide ion-doped manganese oxide. The oxide is reacted with lithium hydroxide water solution under hydrothermal condition of 150-500 degrees C for obtaining lithium. Oxide, carbon source, water and precursor salt solution are mixed and agitated to collect reaction liquid. The reaction liquid is dried to obtain an intermediate product. The carbon source is H-C-O-group alcohol, sugar or polymer. The oxide is chosen from aluminum oxide, silicon dioxide, titanium dioxide, yttrium oxide, indium oxide or antimony oxide. The intermediate product is sintered in a protective atmosphere to obtain a final product at temperature of 500-800 degrees C. An INDEPENDENT CLAIM is also included for a lithium manganate battery material.