| 摘要 |
PURPOSE:To improve cycle characteristics by using a negative electrode active material made of Li or Li alloy and a positive electrode active material containing an element selected among Li, Al, Ce or the like in MnO2. CONSTITUTION:A nonaqueous electrolyte secondary battery uses a negative electrode active material made of Li or Li alloy and a positive electrode active material containing at least one kind of element selected among La, Al, Ce, Se, Er and Mg in MnO2. This positive electrode active material can be obtained by heat-treating a compound of at least one kind of element selected among La, Al, Ce, Se, Er and Mg together with MnO2. The temperature for this heat treatment is preferably 250-450 deg.C. A nonaqueous electrolyte secondary battery with good cycle characteristics and a large capacity can be obtained even when MnO2 is mainly used for the active material. |
