ELECTROLYTE SOLUTION FOR ELECTROLYTIC CAPACITOR, AND ELECTROLYTIC CAPACITOR

To provide an electrolyte solution for an electrolytic capacitor, by which a high performance can be kept over a long period of time even under a harsh environment, and an electrolytic capacitor arranged by use of the electrolyte solution.SOLUTION: An electrolyte solution for an electrolytic capacitor comprises: a capacitor element having an anode foil having a dielectric oxide coating layer on a surface thereof, a negative electrode foil, and a solid electrolyte layer; and an electrolyte solution impregnated into the capacitor element. The electrolyte solution comprises an organic solvent containing a composite compound of a compound having 2-4 condensed rings having a hydroxy group and a carboxyl group, and an inorganic acid, or its salt.SELECTED DRAWING: None 【課題】過酷な環境下でも、長期にわたって高性能を維持できる電解コンデンサ用の電解液及びこの電解液を用いた電解コンデンサを提供する。【解決手段】表面に誘電酸化被膜層を有する陽極箔、陰極箔、及び固体電解質層を有するコンデンサ素子と、該コンデンサ素子に含浸された電解液と、を有する電解コンデンサ用の電解液であり、前記電解液が、ヒドロキシ基とカルボキシル基を有する２〜４の縮合環を有する化合物と無機酸との複合化合物若しくはその塩を含有する有機溶媒からなることを特徴とする電解コンデンサ用の電解液。【選択図】なし