POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION BATTERY, POSITIVE ELECTRODE FOR LITHIUM ION BATTERY, AND LITHIUM ION BATTERY

The present invention provides a positive electrode active material for a lithium ion battery with excellent battery characteristics can be provided. The positive electrode active material for a lithium ion battery is represented by the following composition formula: Li(LiNiM)O (in the 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 ≤ x ≤ 0.1, 0 < y ≤ 0.7, and α > 0).