This study examined the effects of organic and inorganic ammonium salts in the electrolyte of an aluminum electrolytic capacitor on the performance of the electrolyte in terms of conductivity, pH, and sparking voltage. In addition, the capacity (C,), dissipation factor (DF), and leakage current (LC) of capacitors impregnated with electrolytes prepared in this work were periodically measured under loading at high temperatures. The results revealed that the sparking voltage increased quickly in the presence of ammonium dihydrogen phosphate, the conductivity of the electrolyte was promoted by adding ammonium formate as electrolyte, and the oxide film at the surface of aluminum was more stable in the presence of ammonium adipate. Further, the p-nitrobenzoic ammonium formate functioned was hydrogen adsorption reagent. The optimum operating conditions for this system were 0.6% added ammonium dihydrogen phosphate, 5.5% added ammonium adiapate, 14.9% added ammonium formate, and 0.77% added p-nitrobenzoic ammonium formate. The properties of this ethylene glycol/H2O solution were 18.60 mS(.)cm(-1) conductivity, pH 6.37, and sparking voltage 120 V. The results showed that the durability of the aluminum electrolytic capacitor increased to over 1344 h.