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Method of making a multi-electrode double layer capacitor having single electrolyte seal and aluminum-impregnated carbon cloth electrodes

Patent ·
OSTI ID:873119
 [1];  [2];  [1];  [3]
  1. San Diego, CA
  2. Oceanside, CA
  3. Rancho Santa Fe, CA
+ Show Author Affiliations
A method of making a double layer capacitior includes first and second flat stacks of electrodes adapted to be housed in a closeable two-part capacitor case which includes only a single electrolyte seal. Each electrode stack has a plurality of electrodes connected in parallel, with the electrodes of one stack being interleaved with the electrodes of the other stack to form an interleaved stack, and with the electrodes of each stack being electrically connected to respective capacitor terminals. A porous separator is positioned against the electrodes of one stack before interleaving to prevent electrical shorts between the electrodes. The electrodes are made by folding a compressible, low resistance, aluminum-impregnated carbon cloth, made from activated carbon fibers, around a current collector foil, with a tab of the foils of each electrode of each stack being connected in parallel and connected to the respective capacitor terminal. The height of the interleaved stack is somewhat greater than the inside height of the closed capacitor case, thereby requiring compression of the interleaved electrode stack when placed inside of the case, and thereby maintaining the interleaved electrode stack under modest constant pressure. The closed capacitor case is filled with an electrolytic solution and sealed. A preferred electrolytic solution is made by dissolving an appropriate salt into acetonitrile (CH.sub.3 CN). In one embodiment, the two arts of the capacitor case are conductive and function as the capacitor terminals.
Assignee:
Maxwell Energy Products, Inc. (San Diego, CA)
Patent Number(s):
US 6094788
Application Number:
09/233,294
OSTI ID:
873119
Country of Publication:
United States
Language:
English

References (3)

New Highly Conductive Inorganic Electrolytes journal January 1988
Current status of environmental, health, and safety issues of electrochemical capacitors for advanced vehicle applications report April 1997
Preparation of carbon fibre reinforced aluminium via ultrasonic liquid infiltration technique journal July 1993

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