| abstract |
The present invention has for its object to provide an electrolyte solution which can dramatically suppress the time degradation in performance of an electrochemical device, especially an electrochemical capacitor. n The present invention relates ton an electrolyte solution for electrochemical device which comprises an imidazolium salt (A) represented by the general formula (1) as a main component, wherein the content of the imidazolium salt (B) represented by the general formula (2) is not more than 15% by weight to the total weight of the imidazolium salt (A) and imidazolium salt (B); nn n n n n n n n n n (in the formula, R 1 , R 2 and R 3 may be the same or different and each represents an alkyl group containing 1 to 3 carbon atoms; R 4 and R 5 may be the same or different and each represents an hydrogen atom or an alkyl group containing 1 to 3 carbon atoms; and X − represents a counter anion) n n n n n n n n n n (in the formula, R 1 , R 3 , R 4 , R 5 and X − are the same as the definition for the general formula (1)). |