A current collector is covered with sodium metal through: (1) a step of applying a sodium dispersion containing sodium metal and at least one substance selected from the group consisting of an imide salt and a binder, on a current collector in an inert gas...

The invention relates to a method for the formation of a protective film comprising a spinel of formula MnCoO, where x+y=3, on a metallic substrate, characterised in that it comprises the steps of: a) depositing on the substrate manganese and cobalt as met...