Process for making an at least partially coated electrode active material

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

• treating an initial electrode active material, of formula Li1+xTM1−xO2, wherein TM is a combination of Ni, Co, optionally Mn, and optionally Al, Ti, and/or Zr, and x ranges from 0 to 0.2, with at least one compound of W or Mo comprising a group or ion that is replaced or displaced when the compound reacts with a surface of the initial electrode active material, to obtain a treated material;
• subjecting the treated material to an agent to decompose the compound of W or Mo, to obtain an intermediate material;
• and
• repeating the treating and the subjecting steps from 1 to 100 times substituting each subsequent intermediate material for the initial electrode active material, to obtain the at least partially coated electrode active material,
• wherein the at least partially coated electrode active material has an average coating thickness ranging from 0.1 nm to 50 nm.