| abstract |
The present invention relates to Li 1 + x Mn 2-xy M y O 4 (0 ≦ x ≦ 0.1, 0.01 ≦ y ≦ 0.5, M = Al, Mg and Ni, Co, which is a lithium manganese composite oxide used as an active material of a lithium secondary battery). Hydrothermal synthesis method of the same transition metal), and thus, Li 1 + x Mn 2 -x- y M y O 4 (0 ≦ x ≦ 0.1, 0.01 ≦ y ≦ 0.5, M = Al, Mg and Ni, Co, etc. Metal) and electrochemical devices using the same. |