Composite electrode material, method for its production and use of the material

A composite electrode material, method for its production and use of the material are provided. The composite electrode material comprises: (i) a current collector material layer exhibiting a surface roughness value selected from at least one of the following: - an Sdr value of more than 40%; and - an Sdq value of more than 1.0; each value being determined by white light interferometry according to standard method ISO 25178; (ii) optionally, a first silicon layer positioned on the current collector material layer, wherein the first silicon layer has a porosity of less than 30%, as determined by electron microscopy; and (iii) at least a second silicon layer positioned on either the optional first silicon layer or the current collector material layer, wherein the second silicon layer has a porosity ranging from a porosity higher than the porosity of the optional first layer, to a porosity of less than 80%, as determined by electron microscopy.