POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, METHOD OF PREPARING THE SAME, AND POSITIVE ELECTRODE FOR LITHIUM SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY WHICH INCLUDE THE POSITIVE ELECTRODE ACTIVE MATERIAL

The present invention relates to a positive electrode active material including a lithium transition metal oxide represented by Formula 1 and further comprising a coating element M3-containing coating layer formed on a surface of the lithium transition metal oxide, wherein the lithium transition metal oxide has a single particle form, and includes a center portion having a layered structure and a surface portion having a rock-salt structure, a total amount of the doping element M2 and the coating element M3 is in a range of 4,580 ppm to 9,120 ppm based on the total weight of the positive electrode active material: [Formula 1] Li1+a[NixCoyM1zM2w]1-aO2wherein, in Formula 1, 0≤a≤0.2, 0.6≤x