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

Patent · Tue Aug 01 00:00:00 EDT 2000

OSTI ID:873119

Farahmandi, C Joseph ^[1]; Dispennette, John M ^[2]; Blank, Edward ^[1]; Kolb, Alan C ^[3]

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1. San Diego, CA
2. Oceanside, CA
3. Rancho Santa Fe, CA

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.

• DOE Contract Number: EGG-C91-103647
• 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

Related Subjects

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/