SOLID POLYMER ELECTROLYTE COMPOSITE MEMBRANE COMPRISING LASER MICROMACHINED POROUS SUPPORT

摘要

A solid polymer electrolyte composite membrane (11) and method of manufacturing the same. According to one embodiment, the composite membrane comprises a rigid, non-electrically-conducting support (13), the support preferably being a sheet of polyimide having a thickness of about 7.5 to 15 microns. The support has a plurality of cylindrical pores (21) extending perpendicularly between opposing top and bottom surfaces of the support. The pores, which preferably have a diameter of about 5 microns, are made by laser micromachining and preferably are arranged in a defined pattern, for example, with fewer pores located in areas of high membrane stress and more pores located in areas of low membrane stress. The pores are filled with a first solid polymer electrolyte (15), such as a perfluorosulfonic acid (PFSA) polymer. A second solid polymer electrolyte, which may be the same as or different than the first solid polymer electrolyte, may be deposited over the top and/or bottom of the first solid polymer electrolyte.