| abstract |
Provided are a positive electrode active material for nonaqueous secondary batteries, the material having a narrow particle-size distribution and a monodisperse property and being capable of increasing a battery capacity; an industrial production method thereof; and a nonaqueous secondary battery using the positive electrode active material and having excellent electrical characteristics. The positive electrode active material is represented by a general formula: Li 1+u Ni x Co y Mn z M t O 2+α (wherein, 0.05≦u≦0.95, x+y+z+t=1, 0≦x≦0.5, 0≦y≦0.5, 0.5≦z<0.8, 0≦t≦0.1, and M is an additive element and at least one element selected from Mg, Ca, Al, Ti, V, Cr, Zr, Nb, Mo, and W), has an average particle diameter of 3 to 12 um, and has [(d 90 −d 10 )/average particle diameter], an index indicating a scale of particle-size distribution, of 0.60 or less. |