Patent Number: 6,804,108

Title: Electrochemical double layer capacitor having carbon powder electrodes

Abstract: A double layer capacitor includes first and second electrode structures separated by a porous separator. The first and second electrode structures each include a current collector foil, a primary coating formed on the current collector foil, and a secondary coating formed on the primary coating. The primary coatings include conducting carbon powder, and the secondary coatings include activated carbon powder. A method of making the electrode structures includes the steps of: preparing a first slurry that includes conducting carbon powder and a binder; applying the first slurry to a current collector plate; drying the applied first slurry to form a primary coating; preparing a second slurry that includes activated carbon powder, a solvent and a binder; and applying the second slurry to the primary coating.

Inventors: Nanjundiah; Chenniah (San Diego, CA), Braun; Richard P. (San Diego, CA), Christie; Raymond T. E. (San Diego, CA), Farahmandi; C. Joseph (San Diego, CA)

Assignee: Maxwell Electronics, Inc.

International Classification: H01G 9/00 (20060101); H01G 009/00 ()

Expiration Date: 10/12/2021