A positive electrode active material powder suitable for lithium-ion batteries, comprising lithium transition metal-based oxide particles, said particles comprising a core and a surface layer, said surface layer being on top of said core, said particles comprising the elements: Li, a metal M' and oxygen, wherein the metal M' has a formula: M'=(Ni z Mn y Co x ) 1-k A k , wherein A is a dopant, 0.60≤z<0.86, 0.05≤x≤0.20, x+y+z+k=1, and k≤0.01, said positive electrode active material powder having a median particle size D50 ranging from 5μm to 15μm and a surface layer thickness ranging from 10nm to 200nm, said surface layer comprising: - sulfur in a content superior or equal to 0.150wt% and inferior or equal to 0.375wt% with respect to the total weight of the positive electrode active material powder, and - aluminum in a content superior or equal to 0.05wt% and inferior or equal to 0.15wt% with respect to the total weight of the positive electrode active material powder, said surface layer of lithium transition metal-based oxide particles comprising a LiAlO 2 phase and an LiM" 1-a Al a O 2 phase with M" comprising: Ni, Mn, and Co, said LiAlO 2 phase being present in the surface layer in a content superior or equal to 0.10at% and inferior or equal to 0.30at% with respect to the total atomic content of M' in the positive electrode active material powder, said LiM" 1-a Al a O 2 phase being present in the surface layer in a content inferior to 0.14at% with respect to the total atomic content of M' in the positive electrode active material powder. comprising lithium transition metal-based oxide particles, said particles comprising a core and a surface layer, said surface layer being on top of said core, said particles comprising the elements: Li, a metal M' and oxygen, wherein the metal M' has a formula: M'=(Ni z Mn y Co x ) 1-k A k , wherein A is a dopant, 0.60≤z<0.86, 0.05≤x≤0.20, x+y+z+k=1, and k≤0.01, said positive electrode active material powder having a median particle size D50 ranging from 5μm to 15μm and a surface layer thickness ranging from 10nm to 200nm, said surface layer comprising: - sulfur in a content superior or equal to 0.150wt% and inferior or equal to 0.375wt% with respect to the total weight of the positive electrode active material powder, and - aluminum in a content superior or equal to 0.05wt% and inferior or equal to 0.15wt% with respect to the total weight of the positive electrode active material powder, - sulfur in a content superior or equal to 0.150wt% and inferior or equal to 0.375wt% with respect to the total weight of the positive electrode active material powder, and - aluminum in a content superior or equal to 0.05wt% and inferior or equal to 0.15wt% with respect to the total weight of the positive electrode active material powder, said surface layer of lithium transition metal-based oxide particles comprising a LiAlO 2 phase and an LiM" 1-a Al a O 2 phase with M" comprising: Ni, Mn, and Co, said LiAlO 2 phase being present in the surface layer in a content superior or equal to 0.10at% and inferior or equal to 0.30at% with respect to the total atomic content of M' in the positive electrode active material powder, said LiM" 1-a Al a O 2 phase being present in the surface layer in a content inferior to 0.14at% with respect to the total atomic content of M' in the positive electrode active material powder. <EOS>