| 摘要 |
PROBLEM TO BE SOLVED: To provide a positive electrode active material for a lithium ion battery that has battery characteristics with excellent cycle characteristics.SOLUTION: The positive electrode active material for a lithium ion battery is represented by the formula: LiNiMO, where M represents one or more kinds of elements 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, and the average crystal grain size in a cross section of a particle of the positive electrode active material obtained by a scanning ion microscope (SIM) observation is 1.2-5.0 μm. |
