Electric double layer capacitor

摘要

An electric double layer capacitor of the present invention comprises a capacitor element (13) and an electrolyte arranged in a case (12) sealed with a sealer (11), and further comprises in the case (12) a solid buffer for suppressing fluctuation in pH of the electrolyte. The solid buffer includes a compound selected from an oxide and a hydroxide. An element contained in the compound is at least one selected from the group consisting of Be, Al, Si, Sc, V, Cr, Fe, Ni, Cu, Zn, Ga, Ge, Y, Zr, Mo, Ag, Cd, In, Te, La, Ce, Pr, Nd, Pm, Gd, Dy, Ho, Er, Tm, Lu, W and Pb.