Method for making coated electrode active material

The invention relates to a method for making a coated electrode active material, wherein the method comprises the following steps: (a) providing a particulate electrode active material according to general formula Li1+xTM1-xO2, wherein TM is a combination of Ni, Co and, optionally, Mn, and, optionally, at least one metal selected from Mg, Al, Ba, Ti and Zr, and x is in the range of from 0 to 0.2, wherein at least 15 mol% of the transition metal of TM is Ni, (b) treating the electrode active material with a compound of M1, wherein M1 is selected from Li, Al, B, Mg, Si, Sn, and from transition metals, or a combination of at least two of the foregoing, with or without a solvent, wherein the compound of M1 does not act as a cathode active material on its own, (c) optionally, removing compound of M1 which is not deposited on the particulate electrode active material, (d) performing a post-treatment by heating the material obtained after the step (b) or (c), if applicable, at a temperature from 250 to 950 DEG C in