Positive electrode active material for nonaqueous electrolyte secondary batteries, production method thereof, and nonaqueous electrolyte secondary battery including said material

A positive electrode active material for nonaqueous electrolyte secondary batteries, the positive electrode active material comprising:

• a boron compound;
• and
• lithium-nickel-cobalt-manganese composite oxide of general formula (1) having a layered hexagonal crystal structure,
• Li1+sNixCOyMnzMotMwO2 (1)
• where −0.05≤s≤0.20, x+y+z+t+w=1, 0.1≤x≤0.7, 0.1≤y≤0.5, 0.1≤z≤0.5, 0.0003≤t≤0.05, 0≤w≤0.05, and M is one or more elements selected from Ca, Mg, Al, Ti, V, Cr, Zr, Nb, Hf, and Ta,
• wherein the lithium-nickel-cobalt-manganese composite oxide including secondary particles, the secondary particles being composed of agglomerated primary particles, the boron compound being present on at least part of the surface of the primary particles, the boron compound containing lithium,
• wherein the lithium-nickel-cobalt-manganese composite oxide has a ratio (B/Me) of the number of boron (B) atoms in the positive electrode active material to the total number of atoms of nickel, cobalt, manganese, molybdenum, and M (Me) from 0.001 to 0.05.