POSITIVE ELECTRODE ACTIVE MATERIAL POWDER

摘要

The positive electrode active material powder of the present invention is a positive electrode active material powder, including primary particles and aggregated particles of primary particles, wherein an average particle diameter of primary particles and aggregated particles of primary particles in the powder is 0.1 µm or more and 3 µm or less on a volume basis, the percentage of [volumetric sum of particles having a particle diameter of 5 µm or more]/ [volumetric sum of entire particles] is 10% or less, and a BET specific surface area of the powder is more than 2 m 2 /g and 7 m 2 /g or less. When this positive electrode active material powder is used for a nonaqueous electrolyte secondary battery, it becomes possible to exhibit a high discharge capacity and also exhibit a high output at a high current rate.