Patent ID: 8236191

Claim:
An electrical double layer capacitor comprising: a non-aqueous electrolytic solution comprising (A) a solvent comprising a mixture of a fluorine-containing cyclic carbonate represented by the formula (1): wherein X 1 to X 4 are the same or different and each is —H, —F, —CF 3 , —CHF 2 , —CH 2 F, —C 2 F 5 or —CH 2 CF 3 ; at least one of X 1 to X 4 is —F, —CF 3 , —C 2 F 5 or —CH 2 CF 3 , and at least one kind selected from the group consisting of a fluorine-containing chain ester and a fluorine-containing chain ether, and (B) an electrolyte salt comprising a cyclic quaternary onium salt comprising a cyclic quaternary onium cation and a counter anion, and (C) a polarizable electrode comprising activated carbon, wherein the fluorine-containing chain ether is at least one kind selected from the group consisting of CF 3 CF 2 CH 2 —O—CF 2 CFHCF 3 , HCF 2 CF 2 CH 2 —O—CF 2 CFHCF 3 , CF 3 CF 2 CH 2 —O—CF 2 CF 2 H, and HCF 2 CF 2 CH 2 —O—CF 2 CF 2 H.