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The electrolytic conductivities and limiting reduction and oxidation potentials for various organic liquid electrolytes based on quaternary on ium salts have been measured to find better electrolytes for electrical double-layer capacitors. An electrolyte composed of te t raethy lammonium cation, tetrafluoroborate anion, and propylene carbonate solvent showed well-balanced per formance of high electrolytic conductivity, a w ide stable potential w indow and resistance to hydrolysis. Among quaternary on ium salts, t r ie thy lmethy lammonium, ethylmethylpyrrolidinium, and tetramethylenepyrrol idinium tetrafluoroborate salts exhibited higher electrolytic conductivity than the conventional te t raethy lammonium salt due to their much greater solubility. The electrical double- layer capacitor is an electrochemi-cal energy storage device in which electric charge is stored in the electrical double- layer formed at the interface be-tween a polar izable lectrode and an electrolyte solution when dc voltage is applied. Electr ical double- layer capaci-tors composed of a pair of act ivated carbon electrodes with high surface area and an organic l iquid electrolyte have
Ue et al. (Tue,) studied this question.