16. Cathode active material for a non-aqueous electrolyte rechargeable battery comprising secondary particles that are formed by an aggregation of plural primary particles,
the secondary particles comprising a center section having solid or hollow structure, and at least a hollow section where there are no primary particles and an outer-shell section that is electrically connected to the center section on the outside of the center section; and
the secondary particles having an average particle size of 1 µm to 15 µm, and an index [(d90 - d10)/average particle size] that indicates the extent of the particle size distribution of 0.7 or less.
the secondary particles
average particle size
1 µm to 15 µm
µm
the secondary particles
particle size distribution
0.7 or less