| abstract |
Disclosed is a positive electrode active material for lithium ion batteries which has exhibits good battery performance. The positive electrode active material for lithium ion batteries is represented by the structural formula: LixNi1-yMyO2+a. (In the structural formula: M represents at least one selected from Sc, Ti, V, Cr, Mn, Fe, Co, Cu, Zn, Ga, Ge, Al, Bi, Sn, Mg, Ca, B, and Zr; 0.9 ≤ x ≤ 1.2; 0 < y ≤ 0.7; and α > 0.1.) |