| abstract |
Provided is a polymer electrolyte film having superior strength, low dimensional changes, and low film resistance. The polymer electrolyte film, which results from a polymer electrolyte being contained in the voids of a porous film, is characterized by the porous film being obtained by stretching polytetrafluoroethylene obtained by co-polymerizing tetrafluoroethylene and an ethylenic comonomer, and the average pore size of the porous film being greater than 0.20 µm. |