| abstract |
The positive electrode active material for lithium ion batteries which has favorable battery characteristics is provided. The positive electrode active material for a lithium ion battery has a composition formula: Li x Ni 1 - y M y O 2 + α (In the above formula, M is Sc, Ti, V, Cr, Mn, Fe, Co, Cu, Zn, Ga, Ge , Al, Bi, Sn, Mg, Ca, B, and Zr, at least one selected from 0.9 ≤ x ≤ 1.2, 0 <y ≤ 0.7, and α> 0.1. |