PROCESS FOR MAKING A COATED ELECTRODE ACTIVE MATERIAL

Process for the manufacture of a coated cathode active material comprising the steps of (a) providing a particulate electrode active material according to general formula Li1+xTM1-xO2, wherein TM is Ni and, optionally, at least one of Co and Mn, and, optionally, at least one element selected from Al, Mg, and Ba, transition metals other than Ni, Co, and Mn, and x is in the range of from zero to 0.2, wherein at least 50 mole-% of the transition metal of TM is Ni, (b) treating said particulate electrode active material with an aqueous medium that contains a compound of Al or Sb, (c) removing the water from step (b) at least partially, (d) optionally, treating the mixture from step (c) thermally, (e) adding at least one compound selected from compounds of Al or Sb or B, or at least one heteropoly acid or its respective ammonium or lithium salt or salt of Al, Ga, In, or Ba to the solid material obtained from step (d), if applicable, or from (c), respectively, thereby depositing at least one element selected from on the surface of said particulate electrode active material, wherein the element deposited in step (e) is different from the element deposited in step (b), respectively, and (f) treating the residue obtained from step (e) thermally.