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Title: Multi-electrode double layer capacitor having single electrolyte seal and aluminum-impregnated carbon cloth electrodes

Abstract

A single cell, multi-electrode high performance double layer capacitor 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 sleeve is inserted over 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 andmore » sealed. A preferred electrolytic solution is made by dissolving an appropriate salt into acetonitrile (CH{sub 3}CN). In one embodiment, the two parts of the capacitor case are conductive and function as the capacitor terminals. 32 figs.« less

Inventors:
; ; ;
Issue Date:
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
321282
Patent Number(s):
5,862,035
Application Number:
PAN: 8-726,728
Assignee:
Maxwell Energy Products, Inc., San Diego, CA (United States) PTO; SCA: 426000; PA: EDB-99:031250; SN: 99002064421
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 19 Jan 1999
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; CAPACITORS; DIELECTRIC MATERIALS; ELECTROLYTES; ELECTRODES

Citation Formats

Farahmandi, C.J., Dispennette, J.M., Blank, E., and Kolb, A.C. Multi-electrode double layer capacitor having single electrolyte seal and aluminum-impregnated carbon cloth electrodes. United States: N. p., 1999. Web.
Farahmandi, C.J., Dispennette, J.M., Blank, E., & Kolb, A.C. Multi-electrode double layer capacitor having single electrolyte seal and aluminum-impregnated carbon cloth electrodes. United States.
Farahmandi, C.J., Dispennette, J.M., Blank, E., and Kolb, A.C. Tue . "Multi-electrode double layer capacitor having single electrolyte seal and aluminum-impregnated carbon cloth electrodes". United States.
@article{osti_321282,
title = {Multi-electrode double layer capacitor having single electrolyte seal and aluminum-impregnated carbon cloth electrodes},
author = {Farahmandi, C.J. and Dispennette, J.M. and Blank, E. and Kolb, A.C.},
abstractNote = {A single cell, multi-electrode high performance double layer capacitor 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 sleeve is inserted over 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 parts of the capacitor case are conductive and function as the capacitor terminals. 32 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {1}
}