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

Abstract

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. Amore » 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.« less

Inventors:
 [1];  [2];  [1];  [3]
  1. (San Diego, CA)
  2. (Oceanside, CA)
  3. (Rancho Santa Fe, CA)
Issue Date:
OSTI Identifier:
873119
Patent Number(s):
6094788
Application Number:
09/233,294
Assignee:
Maxwell Energy Products, Inc. (San Diego, CA) OSTI
DOE Contract Number:  
EGG-C91-103647
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; multi-electrode; double; layer; capacitor; single; electrolyte; seal; aluminum-impregnated; carbon; cloth; electrodes; capacitior; flat; stacks; adapted; housed; closeable; two-part; electrode; stack; plurality; connected; parallel; interleaved; form; electrically; respective; terminals; porous; separator; positioned; interleaving; prevent; electrical; shorts; folding; compressible; resistance; activated; fibers; current; collector; foil; tab; foils; terminal; height; somewhat; inside; closed; requiring; compression; placed; maintaining; modest; constant; pressure; filled; electrolytic; solution; sealed; preferred; dissolving; appropriate; salt; acetonitrile; cn; embodiment; conductive; function; respective capacitor; single electrolyte; capacitor terminals; porous separator; aluminum-impregnated carbon; closed capacitor; impregnated carbon; appropriate salt; electrolyte seal; interleaved stack; interleaved electrode; electrodes connected; electrolytic solution; carbon cloth; layer capacitor; carbon fibers; activated carbon; carbon fiber; current collector; electrically connected; double layer; placed inside; constant pressure; electrical shorts; electrode stack; requiring compression; two-part capacitor; capacitor terminal; preferred electrolytic; multi-electrode double; modest constant; closeable two-part; collector foil; electrodes adapted; cloth electrodes; prevent electrical; flat stacks; inside height; /29/361/429/

Citation Formats

Farahmandi, C. Joseph, Dispennette, John M., Blank, Edward, and Kolb, Alan C. Method of making a multi-electrode double layer capacitor having single electrolyte seal and aluminum-impregnated carbon cloth electrodes. United States: N. p., 2000. Web.
Farahmandi, C. Joseph, Dispennette, John M., Blank, Edward, & Kolb, Alan C. Method of making a multi-electrode double layer capacitor having single electrolyte seal and aluminum-impregnated carbon cloth electrodes. United States.
Farahmandi, C. Joseph, Dispennette, John M., Blank, Edward, and Kolb, Alan C. Tue . "Method of making a multi-electrode double layer capacitor having single electrolyte seal and aluminum-impregnated carbon cloth electrodes". United States. https://www.osti.gov/servlets/purl/873119.
@article{osti_873119,
title = {Method of making a multi-electrode double layer capacitor having single electrolyte seal and aluminum-impregnated carbon cloth electrodes},
author = {Farahmandi, C. Joseph and Dispennette, John M. and Blank, Edward and Kolb, Alan C.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {8}
}

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