| 摘要 |
Disclosed is a lithium secondary battery including an electrode assembly including a cathode, an anode, and a separator disposed between the cathode and the anode and an electrolyte, wherein the cathode includes a spinel-structure lithium manganese composite oxide represented by Formula 1 below as a cathode active material, and the lithium secondary battery has a charge cut-off voltage of 3.3 to 4 V and, when the charge cut-off voltage is reached, the anode has a potential of 0.75 to 1.545 V within a range within which a potential of the cathode does not exceed 4.95 V:
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒLi x M y Mn 2-y O 4-z A z €ƒ€ƒ€ƒ€ƒ€ƒ(1)
wherein 0.9‰¤x‰¤1.2, 0<y<2, and 0‰¤z<0.2;
M is at least one element selected from the group consisting of Al, Mg, Ni, Co, Fe, Cr, V, Ti, Cu, B, Ca, Zn, Zr, Nb, Mo, Sr, Sb, W, Ti, and Bi; and
A is at least one monovalent or divalent anion. |
