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A positive electrode active material for solid-state batteries, wherein the positive electrode active material comprises Li, M', and oxygen, wherein M' comprises: - Ni in a content x between 50.0 mol% and 75.0 mol%, relative to M'; - Co in a content y between 0.0 mol% and 40.0 mol%, relative to M'; - Mn in a content z between 0.0 mol% and 40.0 mol%, relative to M', - D in a content a between 0.0 mol% and 2.0 mol%, relative to M', wherein D comprises at least one element of the group consisting of: Al, B, Ba, Ca, Cr, Fe, Mg, Mo, Nb, S, Si, Sr, Ti, Y, V, W, and Zn, and, - Zr in a content b between 0.1 mol% and 5.0 mol%, relative to M', - wherein x, y, z, a, and b are measured by ICP, - wherein x+y+z+a+b is 100.0 mol%, wherein the positive electrode active material has a Zr content ZrA defined as, wherein the positive electrode active material has a Zr content ZrB, wherein ZrB is determined by XPS analysis, wherein ZrB is expressed as molar fraction compared to the sum of molar fractions of Co, Mn, Ni, and Zr, as measured by XPS analysis, wherein the ratio ZrB / ZrA > 50.0, wherein the positive electrode active material comprises secondary particles having a plurality of primary particles, wherein said primary particles have an average diameter of between 170 nm to 340 nm as determined by measuring primary particle size in an image taken by SEM.