| abstract |
PROBLEM TO BE SOLVED: To improve cycle characteristics of a 5V class secondary battery. Moreover, the reliability at the time of the high temperature operation | movement of a 5V class secondary battery is improved. A secondary battery is manufactured using a positive electrode active material including an oxide represented by the following general formula (1) and one or more oxides represented by the following general formula (2). LiM 1 a M 2 2-a O 4 (1) (However, in the general formula (1), M 1 is one or more transition metals selected from the group consisting of Ni, Cr, Fe, Co, and Cu. Further, M 2 is essential for Mn. Or a part of Mn may be substituted by Ti or Si, and 0.4 <a <1.1.) M 3 b M 2 c O (2) (However, in the above general formula (2), M 2 represents one or more elements essential to Mn. A part of Mn may be substituted by Ti or Si. Further, M 3 represents Bi, One or two or more elements that require one or more elements selected from the group consisting of La, Nd, Sm, and Ta, provided that M 3 does not contain Li, and b> 0, c ≧ 0.) [Selection] Figure 1 |