METHOD FOR PREPARING LITHIUM-CHROME-MANGANESE OXIDES HAVING LAYERED STRUCTURE FOR LITHIUM SECONDARY BATTERY

摘要

PURPOSE: Provided is a simple and economical method for preparing lithium-chrome-manganese oxides, which have a high discharge capacity suitable to be used as cathode materials for a lithium secondary battery having excellent and stable properties. CONSTITUTION: The method for preparing lithium-chrome-manganese oxides for a lithium secondary battery comprises: a step(10,20) for adding aqueous lithium hydroxide(LiOH) solution to aqueous solution of chrome acetate hydroxide(Cr3(OH)2 (CH3CO2)7) mixed with manganese acetate tetrahydrate((CH3CO2)2Mn·4H2O) to form homogeneous fine precipitates; a step(30) for burning the fine precipitates to form precursor oxide powder represented by the formula of Li£CrxLi(1/3-x/3) Mn(2/3-2x/3)|O2, in which X is 0.1-0.5; and a step(40-80) for heat-treating the precursor oxide powder to form oxide powder having a layered structure.