Process for making a coated electrode active material

A process for manufacturing a coated cathode active material, the process comprising the steps of:

• (a) providing a particulate electrode active material according to general formula Li1+xTM1-xO2, wherein TM is a combination of metals according to general formula (I),
• (NiaCobMnc)1-dMd (I)
• with
• a being in a range of from 0.86 to 0.94,
• b being zero or in a range of from 0.01 to 0.1,
• c being in a range of from 0.01 to 0.1, and
• d being in a range of from zero to 0.1,
• M is at least one of Al, Mg, Nb, Ti, Mo, W, or Zr, and
• a+b+c=1, and
• x is in a range of from zero to 0.05,
• (b) treating said particulate electrode active material with an aqueous medium that contains a compound of Al or Sb selected from AlOOH, Al2O3, Al2(SO4)3, and Sb2O3,
• (c) removing water from step (b) at least partially,
• (d) optionally, treating the mixture from step (c) thermally,
• (e) adding at least one compound selected from the group consisting of
• compounds of Al selected from the group consisting of Al2O3, Al(OH)3, AlOOH, and Al2O3·aq, or
• Sb selected from the group consisting of Sb(OH)3, Sb2O3·aq, Sb2(SO4)3, SbOOH, LiSbO2, Sb2O3, Sb2O5, LiSb3O8, LiSbO3, Li3SbO4, Li5SbO5, Li7SbO6, Sb2O4(Sb(III)Sb(V)O4), and oxyhydroxides of Sb(+V), or
• B selected from the group consisting of B2O3, boric acid and lithium borates,
• to the solid material obtained from step (d), if applicable, or from step (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.