| abstract |
[PROBLEMS] To provide an electric double layer capacitor having high withstand voltage and high capacitance. SOLUTION: An electric double layer capacitor in which a positive electrode and a negative electrode contain activated carbon as an electrode active material and use a room temperature molten salt as an electrolytic solution, wherein the cation constituting the room temperature molten salt is N, N'-dialkyl. Imidazolium, for which an anion has a van der Waals volume of 0.0 It is an anion in the range of 10~0.060nm 3, And the activated carbon is activated carbon having an average pore diameter of 2.5 nm or less. |