Method of manufacturing cathode active material for lithium secondary battery

A method of manufacturing a cathode active material for a secondary battery, the method comprising:

• mixing a transition metal macro precursor and a lithium precursor to prepare a preliminary lithium-transition metal composite oxide particle;
• calcining the preliminary lithium-transition metal composite oxide particle;
• and;
• pulverizing the calcined preliminary lithium-transition metal composite oxide particle through a jet mill to form a lithium-transition metal composite oxide particle having an average particle diameter (D50) smaller than an average particle diameter of the transition metal macro precursor, wherein the transition metal macro precursor has a BET specific surface area of 8.31 to 11 m2/s, wherein the lithium-transition metal composite oxide is represented by Formula 1 below:
• LiaNixM1−xO2+y [Formula 1]
• wherein in Formula 1, a is in a range of 0.9≤a≤1.2, x is 0.6 or more (x≥0.6), and y is in a range of −0.1≤y≤0.1, and M denotes at least one element selected from Na, Mg, Ca, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Co, Fe, Cu, Ag, Zn, B, Al, Ga, C, Si, Sn, Ba, Sr or Zr.