Patent ID: 9218912
Filing Date: 2015-12-22
Classification: H01G,Y02E,Y02T

Abstract:
1. An electrochemical capacitor comprising: an electrolytic solution containing cation, anion, and solvent; a capacitor element impregnated with the electrolytic solution, and including a negative electrode having an electrode layer capable of storing the cation, a positive electrode confronting the negative electrode, and a separator disposed between the positive electrode and the negative electrode; and a housing accommodating the electrolytic solution and the capacitor element, wherein the electrolytic solution includes a lactone component in a quantity ranging from 0.001 wt % to 5 wt % inclusive relative to the solvent, and the electrolytic solution further includes acid formed of at least one of hydroxybutyric acid and hydroxyvaleric acid in a quantity ranging from 0.00001 wt % to 3 wt % inclusive relative to the solvent.