Process for making an at least partially coated electrode active material

A process for making an at least partially coated electrode active material comprising the steps of:

• (a) providing an electrode active material according to general formula Li1+xTM1−xO2, wherein TM is a combination of metals according to general formula (I a)
• (NiaCobMnc)1−dMd (I a)
• with
• a ranging from 0.60 to 0.99;
• b ranging from 0.01 to 0.20;
• c ranging from zero to 0.20;
• and
• d ranging from zero to 0.10;
• M is at least one of Al, Mg, Ti, Nb, Mo, W, and Zr;
• and
• a+b+c=1;
• and x ranges from zero to 0.20;
• or wherein TM corresponds to the general formula (I b)
• (Nia*COb*Ale*)1−d*M2d* (I b)
• with
• a* ranging from 0.75 to 0.95;
• b* ranging from 0.025 to 0.2;
• e* ranging from 0.01 to 0.2;
• and
• d* ranging from zero to 0.1;
• M2 is at least one of W, Mo, Ti and Zr;
• and
• a*+b*+e*=1;
• and x ranges from −0.05 to 0.2;
• (b) treating the electrode active material from step (a) with an aqueous formulation comprising a compound of Me wherein Me is chosen from Sb, Mg, Zn, Sn, and Te, wherein the compound of Me has an average particle diameter (D50) in a range of 200 nm to 10 μm dispersed in water;
• (c) separating off water from the aqueous formulation to form a residue;
• and
• (d) treating the residue thermally under an oxygen-containing atmosphere.