Cathode active material for secondary battery and method for manufacturing a cathode active material

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An anode active material following an embodiment of the present invention is when the strength of the diffraction peak of the (abc) side by X-ray diffraction analysis using the CuKα line is called Iabc, the value represented by I003 / I104 is from 1.50 to 1.80, (I102 + I006) / (I101) R-factor value represented by 0.40 to 0.44. [Formula 1] LiaNibCocMndM1eO2 (0≤a<1.1, 0.6≤b<1.0, 0≤c≤0.5, 0≤d≤0.5, 0≤e≤0.1, and b+c+d+e=1, and M1 is Al, Ni, Co, Mn, Mg, Na, Si, Cr, Fe, Sr, V, Zn, W, Zr, B, Ba, Sc, Cu, Ti, Mo, P, F, Ga, Ge, As, Se, Br, Nb, Tc, rare earth elements and one or more elements selected from a combination thereof.).