14. The positive electrode active material for a non-aqueous electrolyte secondary battery according to claim 13, wherein the average particle size of the secondary particles is within a range of 1 μm to 15 μm, and the value of [(d90−d10)/average particle size], which is an index indicating the spread of the particle size distribution of the secondary particles, is 0.7 or less.
the secondary particles
average particle size
a range of 1 μm to 15 μm
μm
the secondary particles
particle size distribution
0.7 or less