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Solid polymer electrolyte films are prepared by ultraviolet radiation in the mixtures of an ionic liquid salt (1-ethyl-3-methylimidazolium tetrafluoroborate, EMIBF4) and solvent (acetoni- trile (ACN) or propylene carbonate(PC)), and an oligomer (poly(ethylene glycol)diacrylate, PEGDA, 45−60 wt.%). Electrochemical properties of activated carbon supercapacitors adopting the solid poly- mer electrolyte films as a separator are also examined by cyclic voltammetry and impedance mea- surement techniques. As a result, the supercapacitor adopting the PEGDA as much as 45 wt.% exhibits a superior capacitance of 46 Fg 1 at 20 mVs 1 . It seems that this is due to fast kinetics of ion conduction by sufficient film flexibility, which can be allowed by comparatively weak ultra- violet curing of small anount of the PEGDA.

Preparation of Solid Polymer Electrolytes by Ultraviolet Radiation and the Electrochemical Properties of Activated Carbon Supercapacitor Adopting Them