POSITIVE ELECTRODE MATERIAL POWDER AND MANUFACTURING METHOD FOR POSITIVE ELECTRODE MATERIAL POWDER

The present invention relates to positive electrode material powder including a single particle type lithium nickel-based oxide in which an amount of nickel among metals excluding lithium is 80 mol% or more, wherein the positive electrode material powder has a D of 5.0µm or more, and has a crystal strain of 280×10 or less, and a method of preparing the same.