| 摘要 |
Provided is a method for preparing a lithium manganese oxide powder used as a positive electrode material of a lithium ion secondary battery to improve uniformity of the powder and to lower cost by precipitation-evaporation method. The method comprises the steps of titrating a K2CO3 aqueous solution with a MnCl2À4H2O aqueous solution to prepare a MnCO3 precipitate; adding a LiCl aqueous solution to the MnCO3 precipitate; drying the aqueous solution containing MnCO3 and LiCl to obtain a mixture powder of MnCO3 and LiCl; preheating the powder; and calcining the preheated powder, wherein the drying process is carried out by using a rotary evaporator at 30-60 deg.C; a precursor of LiMn2O4 powder is preheated at 300-400 deg.C for 48 hours with a temperature increasing velocity of 1 deg.C/min; and distilled water, an ammonium polymethacrylate aqueous solution and ammonium polycarboxylate in an amount of 1-2 mL per 1 g of the LiMn2O4 and the mixture is wet milled and calcined. |
