Patent number: 6507480
Abstract: An electric double layer capacitor of the present invention having a capacitor element and an electrolyte arranged in a case sealed with a sealer, and further includes in the case 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.
Type:
Grant
Filed:
February 22, 2002
Date of Patent:
January 14, 2003
Assignee:
Matsushita Electric Industrial Co., Ltd.
Inventors:
Susumu Nomoto, Masakazu Tanahashi, Mikinari Shimada, Emiko Igaki
Publication number: 20020159222
Abstract: An electric double layer capacitor of the present invention comprises a capacitor element and an electrolyte arranged in a case sealed with a sealer, and further comprises in the case 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.
Type:
Application
Filed:
February 22, 2002
Publication date:
October 31, 2002
Applicant:
Matsushita Electric Industrial Co. Ltd.
Inventors:
Susumu Nomoto, Masakazu Tanahashi, Mikinari Shimada, Emiko Igaki