| 摘要 |
PURPOSE:To improve cycle characteristic of a nonaqueous electrolyte secondary battery having positive electrode active material of spinel system lithium manganese oxide. CONSTITUTION:Spinel system lithium manganese oxide, shown in a general formula Li [Mn2-XLi]XO4 (0.020<=x<=0.081), is used for the active material of a positive electrode 2. It becomes Li3X [Mn2-x]O4 when charged, and at the point of the time, all manganese in a crystal is Mn<4+> to cause no Mn<3+> in the crystal to make the crystallization structure change of the active material of the positive electrode 2 difficult to be caused. Even at the point of time when all manganese in the active material becomes Mn<4+>, a lithium ion located in a 8a site remains 0.06 or more, and ion conductivity induced by the movement of the lithium ion in an active material crystal is kept in well to effectively charge/discharge all active material, providing a battery less in capacity deterioration following a cycle. |
