| 主权项 |
1. A method for preparing a positive electrode active material for a lithium secondary battery, the method comprising:
preparing a mixture of a precursor represented by Chemical Formula 1 below, a lithium composite oxide represented by Chemical Formula 2 below and capable of intercalating/deintercalating lithium ions, and a lithium feed material; and firing the prepared mixture:
A(OH)2-a [Chemical Formula 1] wherein in Chemical Formula 1, A=NiαCoβMnγ; and −0.3≦a≦0.3, 0.5≦α≦0.64, 0.15≦β≦0.29, and 0.21≦γ≦0.35,
Li[LizA(1-z-a)Da]EbO2-b [Chemical Formula 2] wherein in Chemical Formula 2, A=NiαCoβMnγ; D is at least one element selected from the group consisting of Mg, Al, B, Zr, and Ti; E is at least one element selected from the group consisting of P, F, and S; and −0.05≦z≦0.1, 0≦a≦0.05, 0≦b≦0.05, 0.35≦α<0.5, 0.19≦β≦0.34, and 0.31≦γ≦0.46. |
