Method for covering at least partially with redox active materials

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Process for making an at least partially coated redox-active material wherein said process comprises the following steps : (a) Treating a redox-active material with a metal alkoxide or metal halide or metal amide or alkyl metal compound, wherein said redox-active material contains at least one metal selected from V, Cr, Mn, Fe, Co, Ni, Ag, Cu, Mo, W, Sn, Sb, Te, Pb, Bi and rare earth metals in an oxidized state, (b) Treating the material obtained in step (a) with anoxidizing agent, (c) Repeating the sequence of steps (a) and (b) from one to 100 times, wherein the average thickness of the resulting coating is in the range of from 0.1 to 50 nm.