POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, METHOD FOR PREPARING THE SAME, AND POSITIVE ELECTRODE AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME

The present disclosure discloses a positive electrode active material for a lithium secondary battery comprising a secondary particle having an average particle size (D50) of 1 to 10 µm formed by agglomeration of at least two primary macro particles having an average particle size (D50) of 0.5 to 3 µm; and a coating layer of lithium-metal oxide formed on a surface of the secondary particle, wherein the primary macro particle is represented by LiaNi1-b-c-dCobMncQdO2+δ (1.0≤a≤1.5, 0