| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium secondary battery in which the battery characteristic is hardly reduced after storage when a charged battery is stored at high temperature by adding a prescribed transition metal oxide to a lithium-transition metal composite oxide as positive electrode active material to suppress the oxidation decomposition of the solvent of nonaqueous electrolyte. SOLUTION: This lithium secondary battery has a positive electrode, a negative electrode, and a nonaqueous electrolyte, the positive electrode contains a lithium-transition metal composite oxide as active material, the negative electrode contains a material capable of electrochemically storing and releasing lithium ions or lithium metal as active material. To the lithium-transition metal composite oxide which is the active material of the positive electrode, at least one transition metal oxide selected from FeOb , CoOc , MnOa , NiOe , TiOf and the like is added. The drawing shows the capacity residual factor, taking the volume residual ration (%) as the ordinate and the addition quantity ratio (wt.%) of transition metal oxide to lithium-transition metal composite oxide as the abscissa. |
