Process for coating an oxide material, said process comprising the following steps: (a) providing a particulate material selected from lithiated nickel-cobalt aluminum oxides according to general formula Li[Ni h Co i Al j]O 2+r, lithiated cobalt-manganese oxides according to general formula Li 1+x (Co e Mn r M 4 d) 1-x O 2 and lithiated layered nickel-cobalt-manganese oxides according to general formula Li (1+x) [Ni a Co b Mn c M 4 d] (1-x) O 2, (b) treating said particulate material with a metal alkoxide or metal amide or alkyl metal compound, (c) treating the material obtained in step (b) with moisture, and, optionally, repeating the sequence of steps (b) and (c), wherein steps (b) and (c) are carried out in a mixer that mechanically introduces mixing energy into the particulate material and wherein such mixer is selected from ploughshare mixers that are installed horizontally, from paddle mixers, shovel mixers and free-fall mixers, or by way of a moving bed or fixed bed, and wherein steps (b) and (c) are carried out at a pressure that is in the range of from 5 mbar to 1 bar above 1 atm, wherein the variables are defined as follows: M 4 is selected from Mg, Ca, Ba, Al, Ti, Zr, Zn, Mo, V and Fe, zero ≤ x ≤ 0.2, 0.1 ≤ a ≤ 0.8, zero ≤ b ≤ 0.5, 0.1 ≤ c ≤ 0.6, zero ≤ d ≤ 0.1, and a + b + c + d = 1, e is in the range of from 0.2 to 0.8, f is in the range of from 0.2 to 0.8, and e + f + d = 1, h is in the range of from 0.8 to 0.90, i is in the range of from 0.15 to 0.19, j is in the range of from 0.01 to 0.05, and r is in the range of from zero to 0.4. (a) providing a particulate material selected from lithiated nickel-cobalt aluminum oxides according to general formula Li[Ni h Co i Al j]O 2+r, lithiated cobalt-manganese oxides according to general formula Li 1+x (Co e Mn r M 4 d) 1-x O 2 and lithiated layered nickel-cobalt-manganese oxides according to general formula Li (1+x) [Ni a Co b Mn c M 4 d] (1-x) O 2, (b) treating said particulate material with a metal alkoxide or metal amide or alkyl metal compound, (c) treating the material obtained in step (b) with moisture, and, optionally, repeating the sequence of steps (b) and (c), wherein steps (b) and (c) are carried out in a mixer that mechanically introduces mixing energy into the particulate material and wherein such mixer is selected from ploughshare mixers that are installed horizontally, from paddle mixers, shovel mixers and free-fall mixers, or by way of a moving bed or fixed bed, and wherein steps (b) and (c) are carried out at a pressure that is in the range of from 5 mbar to 1 bar above 1 atm, wherein the variables are defined as follows: M 4 is selected from Mg, Ca, Ba, Al, Ti, Zr, Zn, Mo, V and Fe, zero ≤ x ≤ 0.2, 0.1 ≤ a ≤ 0.8, zero ≤ b ≤ 0.5, 0.1 ≤ c ≤ 0.6, zero ≤ d ≤ 0.1, and a + b + c + d = 1, e is in the range of from 0.2 to 0.8, f is in the range of from 0.2 to 0.8, and e + f + d = 1, h is in the range of from 0.8 to 0.90, i is in the range of from 0.15 to 0.19, j is in the range of from 0.01 to 0.05, and r is in the range of from zero to 0.4. M 4 is selected from Mg, Ca, Ba, Al, Ti, Zr, Zn, Mo, V and Fe, zero ≤ x ≤ 0.2, 0.1 ≤ a ≤ 0.8, zero ≤ b ≤ 0.5, 0.1 ≤ c ≤ 0.6, zero ≤ d ≤ 0.1, and a + b + c + d = 1, e is in the range of from 0.2 to 0.8, f is in the range of from 0.2 to 0.8, and e + f + d = 1, h is in the range of from 0.8 to 0.90, i is in the range of from 0.15 to 0.19, j is in the range of from 0.01 to 0.05, and r is in the range of from zero to 0.4.