CATHODE ACTIVE MATERIAL AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME

摘要

The present invention provides a cathode active material comprising at least one compound selected from the following chemical formula 1, and a lithium secondary battery comprising the same, thereby improving lifetime characteristics and rate properties while exhibiting excellent safety: xLi_2MyMn_(1-y)O_3-zA_z*(1-x)LiM′O_2-z′A_′z′ (1). In the formula xLi2MyMn(1-y)O3-zAz * (1-x) LiM′O2-z′A′z′ (1), M is at least one selected from the group consisting of Ru, Mo, Nb, Te, Re, Ir, Pt, Cr, S, W, Os, and Po; M′ is at least one selected from the group consisting of Ni, Ti, Co, Al, Mn, Fe, Mg, B, Cr, Zr, Zn and transition metals of period II; A and A′ are each independently a minus monovalent or minus divalent anion; and 0