| abstract |
(57) [Abstract] [Purpose] To provide a lithium secondary battery with high capacity and excellent charge / discharge reversibility. [Composition] As a positive electrode active material, lithium salt and NH 4 OH In the X-ray diffraction pattern by CuKα ray synthesized by reacting with electrolytic manganese dioxide having a BET specific surface area of 30 to 100 m 2 / g neutralized with, 2θ is 19 °, 21 , 33 °, 37 °, 42 °, 53 °, 66 °, and the intensity ratio of the peak near 21 ° to the peak near 19 ° is 1: 0.7 to 1: 1. The lithium manganese composite oxide of No. 2 is used. |