ELECTRODE ACTIVE MATERIALS AND METHOD FOR THEIR MANUFACTURE

Particulate electrode active material with an average particle diameter in the range of from 2 to 20 μm (D50) having a general formula LiTMOwherein TM is a combination of Ni, Co and Al, and, optionally, at least one more metal selected from Mg, Ti, Zr, Nb, Ta, Mo, Mn, and W, with at least 80 mole-% of TM being Ni, and wherein x is in the range of from zero to 0.2, wherein the Co content at the outer surface of the secondary particles is higher than at the center of the secondary particles by a factor of at most 5 or by at most 30 mol-%, referring to TM.