Low voltage electrolytic capacitor

An electrolytic capacitor comprising a plurality of spaced aluminum electrodes, at least one of which is coated with a barrier layer dielectric oxide, interleaved spacers, and an electrolyte in contact therewith, said electrolyte comprising about 12-15 wt % of ammonium difluoroacetate salt as solute dissolved in a solvent selected from the group consisting of ethylene glycol and ethylene glycol-butyrolactone mixture and containing about 3-19 wt % water and said electrolyte having a room-temperature resistivity of 150 ohm-cm or lower and a -40.degree. C. resistivity of less than 11,000 ohm-cm to provide a low-voltage capacitor that retains at least 70% capacitance at -40.degree. C.