| 摘要 |
An electrolytic solution for electric double layer capacitor characterized in that a Spiro compound of formula (1) is contained as an electrolyte in an aprotic solvent and that the electric conductivity thereof at -40° C. is 0.85 mS/cm or higher. This electrolytic solution for electric double layer capacitor realizes a high dissolution of electrolyte in solvent and exhibits excellent conductivity and electrostatic capacity over a wide temperature range from low temperature to high temperature. Further, the electrolytic solution for electric double layer capacitor exhibits high resistance to voltage and even under long-term high voltage load, exhibits suppressed lowering of electrostatic capacity to thereby excel in long-term stability.
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