Composite film articles and assemblies that include at least one layer
of expanded fluoropolymer bonded to at least one thermoplastic sheet are fabricated
using a method which can adjust the gas and liquid permeability of the composite
film assemblies. These composite film articles and assemblies optionally have electroactive
properties and a thin porous metallic overlayer that can serve as a current collector,
and can be used in electrochemical devices such as air depolarized cells.
