Electrolyte solution for electric double layer capacitor

摘要

The present invention provides an electric double layer capacitor having a high withstanding voltage, less deterioration, and excellent long-term reliability, especially an effect of suppressing expansion. The present invention relates to an electrolyte solution for an electric double layer capacitor. The solution comprises an electrolyte-salt-dissolving solvent (I) and an electrolyte salt (II). The electrolyte-salt-dissolving solvent (I) contains a fluorine-containing chain ether and a nitrile compound.

主权项

1. An electrolyte solution for an electric double layer capacitor, comprising:
an electrolyte-salt-dissolving solvent (I); and an electrolyte salt (II), the electrolyte-salt-dissolving solvent (I) containing a fluorine-containing chain ether and a nitrile compound, wherein the fluorine-containing chain ether is one or more compounds selected from the group consisting of HCF2CF2CH2OCF2CF2H, CF3CF2CH2OCF2CF2H, HCF2CF2CH2OCF2CFHCF3, CF3CF2CH2OCF2CFHCF3, HCF2CF2CH2OCH2CFHCF3, and CF3CF2CH2OCH2CFHCF3, wherein the electrolyte salt (II) is a triethyl methylammonium salt, a tetraethyl ammonium salt, or a spirobipyridinium salt.