Patent ID: 7074510

Claim:
A method of fabricating a composite ion-exchange membrane, comprising: a) preparing an ion exchange resin solution with a density of 0.5 to 30 wt % by steps comprising admixing an ion exchange resin comprising one or more proton exchange groups in one or more organic solvents; b) forming a polymer membrane by mixing in the presence of ultrasonic waves at least one compound selected from the group consisting of polycaprolactone, polystyrene, propylene carbonate, ethylene carbonate, dimethylcarbonate, diethylcarbonate, dibutyl phthalate, dioctyl phthalate, dissooctyl phthalate, diheptylnonyl phthalate, tritolyl phospate and dioctyl adipate as porogen in the ion exchange resin solution; c) forming pores by removing porogen from the polymer membrane; and d) charging solid proton conductor into the pores whereby 5 to 70 wt % of the solid proton conductor is distributed with respect to 30 to 95 wt % of the ion exchange resin.