Positive Electrode Active Material, Positive Electrode, and Lithium Secondary Battery

Abstract

A positive electrode active material comprising a secondary particle in which a plurality of primary particles are aggregated. The plurality of primary particles have an average particle size measured from a scanning electron microscope (SEM) image of from 1.5 μm to 5.0 μm. A particle size of a primary particle is a particle size based on a ion diameter of the primary particle. A Brunauer-Emmett-Teller (BET) specific surface area measured by nitrogen adsorption BET specific surface area analysis of the positive electrode active material is in a range of from 0.20 m2/g to 0.35 m2/g. A positive electrode comprises the positive electrode active material, and a lithium secondary battery comprises the positive electrode.

Dependencies are inferred from the claim text.