Importance

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Abstract

Disclosed are a cathode active material for lithium secondary batteries and a lithium secondary battery including the same and, more particularly, the present invention relates to a cathode active material for lithium secondary batteries that includes a mixture of an overlithiated transition metal oxide represented by Formula 1 below and a lithium composite transition metal oxide represented by Formula 2 below:

description='In-line Formulae' end='lead'Li_1+aNi_bMn_cCo_1-(a+b+c+d)M_dO_2-sA_s  (1)description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'LiNi_xMn_yCo_1-(x+y+z)M′_zO_2-tA′_t  (2)description='In-line Formulae' end='tail'

wherein 0.1≦a≦0.2, 0.1≦b≦0.4, 0.3≦c≦0.7, 0≦d≦0.1, 0.5≦x≦0.8, 0.1≦y≦0.4, 0≦z≦0.1, 0≦s<0.2, and 0≦t<0.2;M and M′ are each independently at least one divalent or trivalent metal; andA and A′ are each independently at least one monovalent or divalent anion.

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First Claim