PROCESS FOR MAKING A COATED ELECTRODE ACTIVE MATERIAL

Process for making a coated electrode active material wherein said process comprises the following steps: (a) providing a particulate electrode active material according to general formula LiTMO, 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 zero to 0.2, wherein at least 15 mole-% of the transition metal of TM is Ni, (b) treating said electrode active material with a compound of M, wherein Mis 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 said compound of Mdoes not act as a cathode active material on its own, (c) optionally, removing compound of Mwhich is not deposited on said 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° C. in a fluidized bed.