| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium secondary battery having excellent charge and discharge cycle characteristics by using lithium manganese oxide subjected to washing, as a positive electrode active material. SOLUTION: Lithium manganese oxide includes by-product due to the uneven reaction and non-reactant in usual, and it is possible that charge and discharge cycle characteristics is lowered by an impure material. Since the impure material is eliminated by washing lithium manganese oxide, lowering of charge and discharge cycle characteristics can be reduced. Lithium manganese oxide is washed by dipping it in a washing liquid, and agitating or oscillating the liquid, and thereafter, filtering so as to recover the lithium manganese oxide, and drying it in an ordinary way. As the washing liquid, ordinary water is used, but if desired, organic solvent of alcohol such as methanol and ethanol and ketone such as acetone, methyletylketone can be used singly as a mixture. |
