Patent ID: 9564635
Date: 2017-02-07
CPC Classifications: H01M,Y02E,Y02P,Y02T

Claim:
1. A lithium secondary battery comprising: an electrode assembly comprising a cathode, an anode, and a separator disposed between the cathode and the anode; and an electrolyte, wherein the capacity of the anode is 80 to 100% the capacity of the cathode, wherein the cathode comprises 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: 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.