Honda Motor Co., Ltd.
Positive electrode active material for nonaqueous electrolyte secondary battery

Abstract:

A positive electrode active material for a nonaqueous electrolyte secondary battery includes particles of a lithium-transition metal composite oxide that contains nickel in the composition thereof and has a layered structure. The particles have an average particle size D.sub.SEM based on electron microscopic observation in a range of 1 .mu.m to 7 .mu.m in which a ratio D.sub.50/D.sub.SEM of a 50% particle size D.sub.50 in volume-based cumulative particle size distribution to the average particle size based on electron microscopic observation is in a range of 1 to 4, and a ratio D.sub.90/D.sub.10 of a 90% particle size D.sub.90 to a 10% particle size D.sub.10 in volume-based cumulative particle size distribution is 4 or less.