| 摘要 |
A lithium ion secondary battery including a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, and a nonaqueous electrolyte. The positive electrode active material is a lithium transition metal oxide that contains niobium and is represented by xLi[Li1/3Mn2/3-qNbq]O2·(1−x)LiM1-rNbrO2 (0<x<1, 0<xq+(1−x)r≦̸0.3, 0≦̸q≦̸0.3, 0≦̸r≦̸0.3, and M: at least one element selected from the group consisting of nickel, cobalt, and manganese). During initial charging, oxygen desorbs from the positive electrode active material.
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