| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium secondary battery including lithium manganate which has large discharging capacity as the positive electrode active material. SOLUTION: A lithium secondary battery includes the positive electrode active material of lithium manganate expressed with composition formula LixMOy (x means a value which fluctuates in response to the charging and discharging condition, 0<=x<=1.2; 1.9<=y<=2.1) and having each peak P1, P2, P3, P4 in order in four ranges of 18.2 deg.<2θ<18.6 deg., 24.6 deg.<2θ<25.1 deg., 44.6 deg.<2θ<45.0 deg. and 45.0 deg.<2θ<45.4 deg. (where 2θ is diffraction angle) in an X-ray diffraction profile to be obtained by using CuKα beam of the lithium manganate having the composition x=1 as a beam source. |
