16. A positive electrode active material for nonaqueous electrolyte secondary battery, wherein,
the positive electrode active material for a nonaqueous electrolyte secondary battery is composed of secondary particles formed by aggregating a plurality of primary particles,
the secondary particles have a central portion of a hollow structure or a hollow structure, and have at least a space portion where the primary particles are not present and a shell portion electrically connected to the central portion outside the central portion,
the secondary particles have an average particle diameter of 1 to 15 [ mu ] m, and the [ (d90-d 10)/average particle diameter ] as an index indicating the width of the particle size distribution is 0.7 or less.
the secondary particles
average particle diameter
1 to 15 [ mu
mu
the secondary particles
the particle size distribution
0.7 or less