POSITIVE ELECTRODE ACTIVE MATERIAL, ELECTRODE, AND BATTERY

Abstract

A positive electrode active material comprises powder. The powder includes secondary particles. Each of the secondary particles includes primary particles. Each of the primary particles includes an olivine-type phosphate compound. In an SEM image of the powder, a proportion of the secondary particles each having an open pore is 40% or more. For the secondary particles each having an open pore, a relationship of “0.10≤d/D≤0.70” is satisfied. “d” represents a pore diameter of the open pore. “D” represents a maximum Feret diameter of the secondary particle.

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