Jeffery L Parker

US Patent:

56802927, Oct 21, 1997

Filed:

Dec 12, 1994

Appl. No.:

8/354289

Inventors:

Levi T. Thompson - Northville MI
Michael R. Wixom - Ann Arbor MI
Jeffery M. Parker - Belleville MI

Assignee:

T/J Technologies, Inc. - Northville MI

International Classification:

H01G 904

US Classification:

361528

Abstract:

High surface area electrodes for use in electrical and electrochemical energy storage and conversion devices comprise conductive transition metal nitrides, carbides, borides or combinations thereof where the metal is molybdenum or tungsten. Disclosed is a method of manufacturing such electrodes by forming or depositing a layer of metal oxide, then exposing the metal oxide layer at elevated temperature to a source of nitrogen, carbon or boron in a chemically reducing environment to form the desired metal nitride, carbide or boride film. Also disclosed is an ultracapacitor comprised of the new high surface area electrodes having a specific capacitance of 100 mF/cm. sup. 2 and an energy density of 100 mJ/cm. sup. 3 with improved conductivity and chemical stability when compared to currently available electrodes.