Positive Electrode Active Material for Secondary Battery and Lithium Secondary Battery Including the Same

Abstract

A positive electrode active material for a secondary battery which includes a: nickel-based lithium composite transition metal oxide including nickel (Ni), wherein the lithium composite transition metal oxide satisfies Equation 2: [Equation 2] Δ size (| crystallite sizeIB-crystallite sizeFWHM|) ≤20, wherein, in Equation 1 and Equation 2, crystallite sizeFWHM is a crystallite size obtained by calculating from X-ray diffraction (XRD) data using a full width at half maximum (FWHM) method, and crystallite sizeIB is a crystallite size obtained by calculating from XRD data using an integral breadth (IB) method.

Dependencies are inferred from the claim text.