ELECTROLYTIC SOLUTION FOR ALUMINUM ELECTROLYTIC CAPACITOR, AND ALUMINUM ELECTROLYTIC CAPACITOR USING SAME

摘要

Provided is an electrolytic solution for an aluminum electrolytic capacitor, which shows a specific conductivity, a high sparking voltage and a performance causing little expansion of the capacitor in the course of reflow, each being equivalent to a conventional alkyl phosphate anion, and yet has a high reliability without causing a short circuit. Also provided is an aluminum electrolytic capacitor. The electrolytic solution for an aluminum electrolytic capacitor comprises: an electrolyte (C) comprising an alkyl phosphate anion (a) represented by general formula (1) or (2) and an amidinium cation (b); a borate (H) which is obtained by reacting boric acid (d) with diethylene glycol (e) and a polyalkylene glycol (f) having a molecular weight of 130-350 and/or a polyalkylene glycol monoalkyl ether (g) having a molecular weight of 130-350, and has a boron content of 5-14 wt%; and an organic solvent (J).