Patent ID: 6964830

Claim:
A lithium secondary battery, wherein lithium manganese oxide is used as a positive active material, said lithium manganese oxide having a cubic spinel structure of which strength ratio (P 2 /P 1 strength ratio) of a primary endothermal peak (P 1 ) appearing around 950° C. and a secondary endothermal peak (P 2 ) appearing around 1100° C. in differential thermal analysis, is 0.5 or less, said lithium manganese oxide having a formula Li(M 1(x1) M 2(x2) M 3(x3) . . . M m(xm) ) x Mn 2−x O 4 , wherein M 1 is Ti, M 2 is Li, and M 3 . . . M m are metals selected from the group consisting of Fe, Ni, Mg, Zn, Co, Cr, Sn, P, V, Sb, Nb, Ta, Mo and W, wherein x is a substituted amount greater than zero, wherein X 1 is greater than zero, wherein X 2 is greater than or equal to zero, wherein at least one of X 3 , . . . and X m is greater than zero, and wherein a sum of X 1 , X 2 , X 3 ,. . . and X m is 1.