The present invention relates to a coated positive
electrode active material, having a composition comprising Li, M, and O, wherein M comprises: Ni in a content x, wherein 40 at% ≤ x < 100 at%, relative to M; Mn in a content y, wherein 0 at% < y ≤ 35 at%; Co in a content z, wherein 0 at% < z ≤ 30 at%; D in a content d, wherein 0.0 at% ≤ a d ≤ 2 5.0 at%, wherein D is at least one element selected from Al, B, Co, Cu, Mn, Mo, Sr, Ti, V, W, Y, Zn and Zr; and
coating element Si in a content b, wherein 0.000 at% < b ≤ 2.000 at%, and
coating element P in a content c, wherein 0.000 at% < c ≤ 2.000 at%; and having a content SiXPS such that the ratio SiXPS / b ranges from 90 to 340, and having a content PXPS such that the ratio PXPS / c ranges from 45 to 250, wherein PXPS and SiXPS are respectively contents of P and Si in at% relative to M measured by X-
ray Photoelectron
Spectroscopy XPS.