Positive Electrode Active Material And Method For Manufacturing A Positive Electrode Active Material

Abstract: The present invention relates to a positive electrode active material for lithium-ion rechargeable batteries, comprising particles having Li, M', and oxygen, wherein M' comprises: - Ni in a content x, wherein x = 80 at%, relative to M'; - Co in a content y, wherein 0.01 = y = 20.0 at%, relative to M'; - Mn in a content z, wherein 0 = z = 20.0 at%, relative to M'; - Y in a content b, wherein 0.01 = b = 2.0 at%, relative to M'; - Zr in a content c, wherein 0.01 = c = 2.0 at%, relative to M'; - D in a content a, wherein 0 = a = 5.0 at%, relative to M', wherein D is at least one element selected from the list of B, Ba, Ca, Cr, Fe, Mg, Mo, Nb, S, Si, Sr, Ti, V, W, and Zn; wherein x, y, z, a, b, and c are measured by ICR, wherein x+y+z+a+b+c is 100.0 at%, wherein the positive electrode active material comprises monolithic particles, wherein the particles have a Co content Coedge as measured by cross-sectional EDS (CS-EDS) at an edge of the particles, wherein Coedge is expressed as at% relative to the sum of Ni, Mn, and Co content as measured by CS-EDS at the edge of the particles, wherein the particles have a Co content CoCenter as measured by CS-EDS at a center of the particle, wherein Cocenter is expressed as at% relative to the sum of Ni, Mn, and Co content as measured by CS-EDS at the center of the particles, and wherein the ratio Coedge /Cocenter > 1.10.

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