CPC H01M 4/366 (2013.01) [C01G 53/42 (2013.01); H01M 4/0471 (2013.01); H01M 4/131 (2013.01); H01M 4/1391 (2013.01); H01M 4/525 (2013.01); H01M 4/628 (2013.01); H01M 10/0525 (2013.01); C01P 2002/50 (2013.01); C01P 2002/88 (2013.01); C01P 2004/62 (2013.01); C01P 2004/64 (2013.01); C01P 2004/84 (2013.01); C01P 2006/40 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] | 5 Claims |
1. A method of preparing a positive electrode active material, comprising
(i) forming a positive electrode active material through a heat treatment process; and
(ii) washing the positive electrode active material with washing water including at least one of a water-soluble ammonium-based organic compound and a water-soluble amine-based organic compound,
wherein the positive electrode active material comprises a core including lithium nickel composite oxide represented by Chemical Formula 1:
LiaNixCoyMzO2 [Chemical Formula 1]
wherein, in Chemical Formula 1,
M is one or two or more a metal element selected from Al, Cr, Fe, V, Mg, Ti, Zr, Nb, Mo, W, Cu, Zn, Ga, In, Sn, La, and Ce,
0.9≤a≤1.05,
0.7≤x<1.0,
0.01≤y≤0.3,
0.01≤z≤0.3, and
x+y+z=1,
wherein the prepared positive electrode active material has a surface layer present on the core, the surface layer includes at least one of a water-soluble ammonium-based organic compound and a water-soluble amine-based organic compound derived from the washing water, and
wherein an area of the surface layer is 0.1% to 10% of the total surface area of the core.
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