To provide an assembly provided with a thermally and dimensionally stabilized polyimide film and an electrode, and a method of the same.

The assembly is provided with the electrode and the polyimide film. The polyimide film contains 40-95 wt.% polyimide derived from at least one kind of an aromatic di-anhydride and at least an aromatic diamine. The aromatic di-anhydride and the aromatic diamine are selected from a combination of a rigidity rod structure A and/or a non-rigidity rod structure B, the ratio by mol of di-anhydride to the diamine is 48-52:(52-48) and the ratio by mol of A:B is 20-80:(80-20). The polyimide film is about <100 nanometer in all sizes and contains 5-60 wt.% filler per total weight of polyimide film.