POSITIVE ELECTRODE ACTIVE MATERIAL AND LITHIUM SECONDARY BATTERY USING SAME

摘要

Disclosed is a positive electrode active material including a plurality of crystal particles comprising lithium manganate with a spinel structure. At least 70% of all the crystal particles by area are primary particles, which are those with a particle diameter of 3 - 20 µm. The primary particles each have a component that includes a rectangular face, where the portion of the total surface area of each primary particle represented by a rectangular face is 0.5 - 5%.