Solid polymer electrolyte membranes based on quaternized polysulfone and solvent-free fluid as separators for electrical double-layer capacitors

An electrical double-layer capacitor using new solid polymer electrolyte shows a specific capacitance of 114.0 F g−1 at a current density of 1 A g−1 and outstanding cycling stability, which is comparable to that of a device using porous polypropylene (PP) membrane.240