PREPARATION METHOD FOR POSITIVE ELECTRODE ACTIVE MATERIAL FOR SECONDARY BATTERY

Provided is a method of preparing a positive electrode active material for a secondary battery, which includes: providing a positive electrode active material precursor containing nickel, cobalt, and manganese and having a nickel content accounting for 60 mol% or more of total metals; and forming a lithium transition metal oxide by mixing the positive electrode active material precursor, a lithium source material, a first firing additive, a second firing additive, and a third firing additive and performing primary firing, wherein the first firing additive is a lithium-containing compound, the second firing additive is a carbonate ion-containing compound, and the third firing additive is a boron-containing compound.