CA2161444A1 - Supercapacitor and process for manufacturing same - Google Patents
Supercapacitor and process for manufacturing sameInfo
- Publication number
- CA2161444A1 CA2161444A1 CA002161444A CA2161444A CA2161444A1 CA 2161444 A1 CA2161444 A1 CA 2161444A1 CA 002161444 A CA002161444 A CA 002161444A CA 2161444 A CA2161444 A CA 2161444A CA 2161444 A1 CA2161444 A1 CA 2161444A1
- Authority
- CA
- Canada
- Prior art keywords
- current collector
- container
- carbon
- electrode
- collector substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/26—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features
- H01G11/28—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/32—Carbon-based
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/32—Carbon-based
- H01G11/40—Fibres
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
Abstract
There is disclosed a double-layer capacitor having electrodes formed of a current collector (20) positioned against a nonwoven web of non-activated carbonfibers (22) impregnated with carbon particles and positioned on either side of aporous layer (16) within a container (12) including a suitable electrolyte and having a conductor (24) connected to each current collector (20) of each electrode wherein the carbon fibers are of a surface area of less than 100 m2/g, preferably less than 5 m2/g.
Description
094l285~ 2 1 6 1 4 4 4 PCT/CA94/0027 ' SUPERCAPACITOR AND PROCESS FOR MANUFACTURING SAME
BACKGROUND OF THE INVENTION
1. Field of the Invention This invention relates to an electrical double-layer capacitor and more particularly to an improved electrical double-layer supercapacitor and process for manufacturing same.
BACKGROUND OF THE INVENTION
1. Field of the Invention This invention relates to an electrical double-layer capacitor and more particularly to an improved electrical double-layer supercapacitor and process for manufacturing same.
2. Description of the Prior Art An electrolytic double-layer capacitor is comprised of a separate layer positioned between polarizable electrodes enclosed in a container including an electrolyte whereby when voltage is applied one electrode is negatively charged and the other electrode is positively charged, such as disclosed in U.S.P. 4,562,511 to Nishino et al. As disclosed therein, each electrode is in contact with a side of the container which is insulated from the other side thereof. A thus charged capacitor may be discharged over a period of time as a power source, and subsequently recharged again and again as a power source.
U.S.P. Nos. 4,597,028 and 4,626,964 are also illustrative of the prior art. In U.S.P. No. 4,626,964 to Azuma et al., there is disclosed a double layer capacitor including paired electrodes comprised of activated carbon fiber fabric impregnated with activated carbon particles. Such capacitors are formed of costly materials of construction to achieve desired large sur~ace areas on the fabric substrate.
W0941285~ 21 6 1 4 4 4 PCT/CA94100275 Additionally, attaching current collectors to the activated carbon fiber fabric requires plasma or flame spraying techniques limiting useful capacitor configurations.
OBJECTS OF THE PRESENT I~v~NllON
An object of the present invention is to provide an improved double-layered supercapacitor.
Another object of the present invention is to provide an improved double-layered supercapacitor from less costly material of construction.
Still another object of the present invention is to provide an improved supercapacitor which may be readily manufactured without time consuming critical processing steps.
Yet another object of the present invention is to provide an improved process for manufacturing supercapacitors of bipolar configurations.
A still further object of the present invention is to provide supercapacitors of large surface areas.
SUMMARY OF THE PRESENT INVENTION
These and other objects of the present invention are achieved by a double-layer capacitor having electrodes formed of a current collector positioned against a nonwoven web of non-activated carbon fibers impregnated with carbon particles and positioned on either side of a porous layer within a container including a suitable electrolyte and having a conductor connected to each current collector of each electrode W094/28563 2 1 6 1 4 4 4 PCT/CAg4/0027~
wherein the carbon fibers are of surface areas of less than 100 m2/g, preferably less than 5 m2/g.
BRIEF DESCRIPTION OF THE DRAWINGS
Other features and advantages of the present invention will become more readily apparent from the following detailed description when taken with the accompanying drawing of a schematic elevational view of a double-layer capacitor illustrating a preferred embodiment of the present invention.
DETAILED DESCRIPTION OF THE PRESENT INVENTION
Referring now to the drawing, there is illustrated a double-layer capacitor, generally indicated as 10, comprised of a housing member 12 defining a chamber 14 in which is positioned a separator member 16 disposed between electrode members, generally indicated as 18 and an electrolyte (not shown). Each electrode member 18 is a laminated structure comprised of a metal substrate 20 and reactive layers 22 laminated to the metal substrate 20, such as disclosed in U.S.P. No. 4,906,535 to Hoge. The metal substrate 20 may be as metal mesh, foil or vapor or epoxy dependent layer and is connected to a conductor 24 to be attached to electrical elements as understood by one skilled in the art.
The metal substrate 20 is a current collector formed of a suitable metallic material, such as nickel, stainless steel and the like, formed for example by expanded metal techniques.
W094/285~ 2 1 6 1 4 4 4 PCT/CA94/00275 Choice of the metallic material is a function of the electrolyte to be used, as more fully hereinafter discussed.
The reactive layer 22 is comprised of a nonwoven web of non-activated carbon fibers impregnated with a mixture of carbon particles and a nonfibrous polymeric substance for holding the carbon particles in the web. The non-activated carbon fibers are of a length of from about 0.5 to 1.25 inches and a diameter of from about 5.0 to 15.0~. The carbon fibers are of a surface area of less than 100 m2/g, preferably less than 5 m2/g. The carbon content of such carbon fibers is preferably at least about 90 weight ~ exhibiting as resistance of less than about 20 ohms/cm2.
The nonwoven web of carbon fibers is formed into a thickness of from 5 to 50 mils exhibiting a pore volume of at least about 90~, to provide a high pick up of the impregnation mixture whether in suspension or in a coating format. The impregnation mixture should increase the basic weight of the fibrous web of carbon fiber by about 20 to 200 g/m2 as a function of solids content of the impregnation suspension or coating and pore volume of the fibrous web, and provide a front-to-back (F/B) electrical conductivity of less than about 1 ohm.
The impregnation mixture, in the form of a suspension or coating, is comprised of carbon particles, generally in the form of carbon black, a nonfibrous polymeric material to bind W094/28563 2 1 6 1 ~ 4 4 PCT/CA94/00275 the carbon particles to the web and a dispersion or mixing agents. The carbon particles are sized, expressed as surface area (m2/g), generally in excess of 1000, and preferably greater than about 1250, such as Black Pearls 2000, available from Cabot Corporation having a mean particle diameter of 0.015~.
The nonfibrous polymeric materials include the polytetrafluoroethylenes,such as Teflon T-30, a registered trademark of duPont. The dispersion or mixing agents include the sodium salt of polymeric naphthalene sulfonic acid and those included with the polytetrafluoroethylene (PTFE).
The nonwoven web of carbon fiber is impregnated by immersion, coating extrusion or the like, with the aqueous suspension of the impregnation mixture of the carbon particles, nonfibrous polymeric substance and other desired nonfibrous ingredients. The impregnated conductive nonwoven web is preferably dried at a temperature of from about 150 to 400F., (a temperature below the sintering temperature of the binder material, i.e., the PTFE) and a temperature high enough to ensure substantially complete moisture removal.
An electrode member is positioned on either side of a porous separator member 16 within the chamber 14 of the housing 12 and an electrolyte, such as potassium hydroxide (4M) is added to fill the void volume prior to encapsulating the members within the chamber 14. The separator member 16 is W094/285~ 2 1 6 1 4 4 4 PCT/CA94/00275 formed of dielectric porous material, such as a sheet of hydrophilic polypropylene (Celgard, a registered tr~em~rk of Hoescht-Celanese).
The electrolyte may be any suitable electrolyte for use in the generation of electricity in a battery configuration given the metal of the current collector. Potassium hydroxide solutions may be used with a current collector in the form of nickel whereas sulfuric acid may necessitate the use of lead-based or tantalum-based current collector materials to withstand the corrosive effect of sulfuric acid. Improved conductivity and an increase in voltage are achieved by use of sulfuric acid and lead-based current collector materials of construction. Still higher voltages may be achieved by use of organic-based electrolytes with alnm;nllm-based current collectors.
EXAMPLES OF THE INVENTION
The process of the present invention is set forth in the following specific examples which are intended to be merely illustrative and the present invention is intended not to be limited thereto.
EXAMPLE i A nonwoven web of carbon fibers (International Paper Company) is introduced into a continuous web machine to effect coating and drying operations. The impregnated mixture (carbon/Teflon is comprised of 36 gms. of an aqueous W094/28563 2 1 6 1 4 4 4 PCT/CAg4/0027~
.
dispersion of Black Pearls 2000 (15~ solids) and 0.9 gms.
Teflon T-30 (60~ 0 solids) applied at a solids content of 12.0~. Impregnation is effected to provide an add-on of 60 GSM. The resulting impregnated layers and fine nickel mesh (Delker) precoated with an adhesive are passed through and over maintained at a temperature of from 200 to 300F. and thence passed through laminating rolls at a nip pressure of 600 pounds per lineal inch at a temperature of 250F. to form the electrode substrate.
Sheets of the electrode substrate connected to a conductor are positioned on either side of a slightly larger sheet of porous polypropylene to form a "Swiss roll~ which is placed in a container of 9M KOH. The total area of nonwoven is 680 cm2 (i.e., 170 cm2 per contacting surface between current collector and a layer of the nonwoven web) with a working volume below about 20 cm3. The resulting capacitor assembly is repeatedly charged to 1 Volt and discharged to different resistors. The apparent capacitance is 67 Farad at 20 ohm discharge and 81 Farad at 100 ohm discharge. Self discharge is nominal (78~ of the charge retained after 60 hrs.).
EXAMPLE II
A carbon black dispersion is prepared contained carbon black BP-2000, dispersant and Teflon emulsion T-30 of total solids content of 14.7~ by weight and solids Teflon of 20 weight ~ on the amount of carbon. A nonwoven web of carbon W094/285~ PCT/CA94/00275 particles as in Example I is impregnated in the dispersion and dried to produce solids deposition by impregnation of 90 g/m2. A nickel metal (M) mesh (Delco) is coated with an adhesive and after drying is laminated with impregnated nonwoven layers (CL) using hot rolling techni~ues to produce an electrode structure comprised of CL/CL/M/CL/CL. Adherence of the carbon layers is facilitated with solid adhesive powder.
The nickel mesh (M) layer is slightly larger to provide electrical contact. Two of such sheets (13.5 cm x 17.5 cm) are positioned on either side of a slightly larger sheet of porous polypropylene and positioned within a plastic container.
4M KOH is added and the container sealed with the nickel contacts extending from the cont~;ner (total weight - 100 g.) to forma supercapacitor which when charged to 1.2 V and discharged at 10A shows a capacitance of about 240 Farads.
While the present invention has been described with reference to a double-layer capacitor, it will be understood that bipolar configurations are contemplated, e.g., M/CL/SL/CL/M/CL/S/CL/M/ wherein S is the porous separation layer.
In accordance with the present invention, it is believed that the surface area of the particulate carbon stores the charge compared to the charging of the nonwoven web of activated carbon fibers of the prior art.
W094/28~ 2 1 6 1 4 4 4 PCT/CA94/0027s While the invention has been described in connection with an exemplary embodiment thereof, it will be understood that many modifications will be apparent to those of ordinary skill in the art; and that this application is intended to cover any adaptations or variations thereof. Therefore, it is manifestly intended that this invention be only limited by the claims and the equivalents thereof.
U.S.P. Nos. 4,597,028 and 4,626,964 are also illustrative of the prior art. In U.S.P. No. 4,626,964 to Azuma et al., there is disclosed a double layer capacitor including paired electrodes comprised of activated carbon fiber fabric impregnated with activated carbon particles. Such capacitors are formed of costly materials of construction to achieve desired large sur~ace areas on the fabric substrate.
W0941285~ 21 6 1 4 4 4 PCT/CA94100275 Additionally, attaching current collectors to the activated carbon fiber fabric requires plasma or flame spraying techniques limiting useful capacitor configurations.
OBJECTS OF THE PRESENT I~v~NllON
An object of the present invention is to provide an improved double-layered supercapacitor.
Another object of the present invention is to provide an improved double-layered supercapacitor from less costly material of construction.
Still another object of the present invention is to provide an improved supercapacitor which may be readily manufactured without time consuming critical processing steps.
Yet another object of the present invention is to provide an improved process for manufacturing supercapacitors of bipolar configurations.
A still further object of the present invention is to provide supercapacitors of large surface areas.
SUMMARY OF THE PRESENT INVENTION
These and other objects of the present invention are achieved by a double-layer capacitor having electrodes formed of a current collector positioned against a nonwoven web of non-activated carbon fibers impregnated with carbon particles and positioned on either side of a porous layer within a container including a suitable electrolyte and having a conductor connected to each current collector of each electrode W094/28563 2 1 6 1 4 4 4 PCT/CAg4/0027~
wherein the carbon fibers are of surface areas of less than 100 m2/g, preferably less than 5 m2/g.
BRIEF DESCRIPTION OF THE DRAWINGS
Other features and advantages of the present invention will become more readily apparent from the following detailed description when taken with the accompanying drawing of a schematic elevational view of a double-layer capacitor illustrating a preferred embodiment of the present invention.
DETAILED DESCRIPTION OF THE PRESENT INVENTION
Referring now to the drawing, there is illustrated a double-layer capacitor, generally indicated as 10, comprised of a housing member 12 defining a chamber 14 in which is positioned a separator member 16 disposed between electrode members, generally indicated as 18 and an electrolyte (not shown). Each electrode member 18 is a laminated structure comprised of a metal substrate 20 and reactive layers 22 laminated to the metal substrate 20, such as disclosed in U.S.P. No. 4,906,535 to Hoge. The metal substrate 20 may be as metal mesh, foil or vapor or epoxy dependent layer and is connected to a conductor 24 to be attached to electrical elements as understood by one skilled in the art.
The metal substrate 20 is a current collector formed of a suitable metallic material, such as nickel, stainless steel and the like, formed for example by expanded metal techniques.
W094/285~ 2 1 6 1 4 4 4 PCT/CA94/00275 Choice of the metallic material is a function of the electrolyte to be used, as more fully hereinafter discussed.
The reactive layer 22 is comprised of a nonwoven web of non-activated carbon fibers impregnated with a mixture of carbon particles and a nonfibrous polymeric substance for holding the carbon particles in the web. The non-activated carbon fibers are of a length of from about 0.5 to 1.25 inches and a diameter of from about 5.0 to 15.0~. The carbon fibers are of a surface area of less than 100 m2/g, preferably less than 5 m2/g. The carbon content of such carbon fibers is preferably at least about 90 weight ~ exhibiting as resistance of less than about 20 ohms/cm2.
The nonwoven web of carbon fibers is formed into a thickness of from 5 to 50 mils exhibiting a pore volume of at least about 90~, to provide a high pick up of the impregnation mixture whether in suspension or in a coating format. The impregnation mixture should increase the basic weight of the fibrous web of carbon fiber by about 20 to 200 g/m2 as a function of solids content of the impregnation suspension or coating and pore volume of the fibrous web, and provide a front-to-back (F/B) electrical conductivity of less than about 1 ohm.
The impregnation mixture, in the form of a suspension or coating, is comprised of carbon particles, generally in the form of carbon black, a nonfibrous polymeric material to bind W094/28563 2 1 6 1 ~ 4 4 PCT/CA94/00275 the carbon particles to the web and a dispersion or mixing agents. The carbon particles are sized, expressed as surface area (m2/g), generally in excess of 1000, and preferably greater than about 1250, such as Black Pearls 2000, available from Cabot Corporation having a mean particle diameter of 0.015~.
The nonfibrous polymeric materials include the polytetrafluoroethylenes,such as Teflon T-30, a registered trademark of duPont. The dispersion or mixing agents include the sodium salt of polymeric naphthalene sulfonic acid and those included with the polytetrafluoroethylene (PTFE).
The nonwoven web of carbon fiber is impregnated by immersion, coating extrusion or the like, with the aqueous suspension of the impregnation mixture of the carbon particles, nonfibrous polymeric substance and other desired nonfibrous ingredients. The impregnated conductive nonwoven web is preferably dried at a temperature of from about 150 to 400F., (a temperature below the sintering temperature of the binder material, i.e., the PTFE) and a temperature high enough to ensure substantially complete moisture removal.
An electrode member is positioned on either side of a porous separator member 16 within the chamber 14 of the housing 12 and an electrolyte, such as potassium hydroxide (4M) is added to fill the void volume prior to encapsulating the members within the chamber 14. The separator member 16 is W094/285~ 2 1 6 1 4 4 4 PCT/CA94/00275 formed of dielectric porous material, such as a sheet of hydrophilic polypropylene (Celgard, a registered tr~em~rk of Hoescht-Celanese).
The electrolyte may be any suitable electrolyte for use in the generation of electricity in a battery configuration given the metal of the current collector. Potassium hydroxide solutions may be used with a current collector in the form of nickel whereas sulfuric acid may necessitate the use of lead-based or tantalum-based current collector materials to withstand the corrosive effect of sulfuric acid. Improved conductivity and an increase in voltage are achieved by use of sulfuric acid and lead-based current collector materials of construction. Still higher voltages may be achieved by use of organic-based electrolytes with alnm;nllm-based current collectors.
EXAMPLES OF THE INVENTION
The process of the present invention is set forth in the following specific examples which are intended to be merely illustrative and the present invention is intended not to be limited thereto.
EXAMPLE i A nonwoven web of carbon fibers (International Paper Company) is introduced into a continuous web machine to effect coating and drying operations. The impregnated mixture (carbon/Teflon is comprised of 36 gms. of an aqueous W094/28563 2 1 6 1 4 4 4 PCT/CAg4/0027~
.
dispersion of Black Pearls 2000 (15~ solids) and 0.9 gms.
Teflon T-30 (60~ 0 solids) applied at a solids content of 12.0~. Impregnation is effected to provide an add-on of 60 GSM. The resulting impregnated layers and fine nickel mesh (Delker) precoated with an adhesive are passed through and over maintained at a temperature of from 200 to 300F. and thence passed through laminating rolls at a nip pressure of 600 pounds per lineal inch at a temperature of 250F. to form the electrode substrate.
Sheets of the electrode substrate connected to a conductor are positioned on either side of a slightly larger sheet of porous polypropylene to form a "Swiss roll~ which is placed in a container of 9M KOH. The total area of nonwoven is 680 cm2 (i.e., 170 cm2 per contacting surface between current collector and a layer of the nonwoven web) with a working volume below about 20 cm3. The resulting capacitor assembly is repeatedly charged to 1 Volt and discharged to different resistors. The apparent capacitance is 67 Farad at 20 ohm discharge and 81 Farad at 100 ohm discharge. Self discharge is nominal (78~ of the charge retained after 60 hrs.).
EXAMPLE II
A carbon black dispersion is prepared contained carbon black BP-2000, dispersant and Teflon emulsion T-30 of total solids content of 14.7~ by weight and solids Teflon of 20 weight ~ on the amount of carbon. A nonwoven web of carbon W094/285~ PCT/CA94/00275 particles as in Example I is impregnated in the dispersion and dried to produce solids deposition by impregnation of 90 g/m2. A nickel metal (M) mesh (Delco) is coated with an adhesive and after drying is laminated with impregnated nonwoven layers (CL) using hot rolling techni~ues to produce an electrode structure comprised of CL/CL/M/CL/CL. Adherence of the carbon layers is facilitated with solid adhesive powder.
The nickel mesh (M) layer is slightly larger to provide electrical contact. Two of such sheets (13.5 cm x 17.5 cm) are positioned on either side of a slightly larger sheet of porous polypropylene and positioned within a plastic container.
4M KOH is added and the container sealed with the nickel contacts extending from the cont~;ner (total weight - 100 g.) to forma supercapacitor which when charged to 1.2 V and discharged at 10A shows a capacitance of about 240 Farads.
While the present invention has been described with reference to a double-layer capacitor, it will be understood that bipolar configurations are contemplated, e.g., M/CL/SL/CL/M/CL/S/CL/M/ wherein S is the porous separation layer.
In accordance with the present invention, it is believed that the surface area of the particulate carbon stores the charge compared to the charging of the nonwoven web of activated carbon fibers of the prior art.
W094/28~ 2 1 6 1 4 4 4 PCT/CA94/0027s While the invention has been described in connection with an exemplary embodiment thereof, it will be understood that many modifications will be apparent to those of ordinary skill in the art; and that this application is intended to cover any adaptations or variations thereof. Therefore, it is manifestly intended that this invention be only limited by the claims and the equivalents thereof.
Claims (11)
1. An improved capacitor comprising:
a housing defining a chamber;
a porous separator member disposed in said chamber of said housing;
electrode member disposed on either side of said separator member, each electrode member comprised of a current-collecting substrate positioned against a nonwoven web of non-activated carbon fibers impregnated with carbon particles.
a conductor connected to said current collector of each electrode member; and an electrolyte.
a housing defining a chamber;
a porous separator member disposed in said chamber of said housing;
electrode member disposed on either side of said separator member, each electrode member comprised of a current-collecting substrate positioned against a nonwoven web of non-activated carbon fibers impregnated with carbon particles.
a conductor connected to said current collector of each electrode member; and an electrolyte.
2. The improved capacitor as defined in Claim 1 wherein said surface area of said carbon fibers are less than 5 m2/g.
3. The improved capacitor as defined in Claim 1 wherein said electrode member is comprised of a nonwoven web of non-activated carbon fibers positioned on either side of said current collector substrate.
4 The improved capacitor as defined in Claim 1 wherein said electrode member is comprised of two (2) adhesively-connected carbon layers positioned on either side of said current collector substrate.
5. The improved capacitor as defined in Claim 1 and further including a plurality of electrodes disposed between a plurality of separator members within said container.
6. The process for preparing a supercapacitor, which comprises:
impregnating a nonwoven web of non-activated carbon particles with a dispersion of carbon particles to form a carbon layer;
positioning said carbon layer against a current collector substrate to form an electrode;
positioning an electrode on either side of a porous separator plate within a container;
adding an electrolyte to said container; and sealing said container.
impregnating a nonwoven web of non-activated carbon particles with a dispersion of carbon particles to form a carbon layer;
positioning said carbon layer against a current collector substrate to form an electrode;
positioning an electrode on either side of a porous separator plate within a container;
adding an electrolyte to said container; and sealing said container.
7. The process as defined in Claim 6 and further including the step of forming a carbon layer on either side of said current collector substrate.
8. The process as defined in Claim 6 and further including the step of connecting a conductor to said current collecting substrate prior to sealing said container.
9. The process as defined in Claim 6 and further including a nonfibrous polymeric material in said dispersion prior to said impregnating step.
10. The process as defined in Claim 6 wherein said carbon layer is dried prior to positioning same against said current collector substrate.
11. The process as defined in Claim 6 wherein adhesive is applied to said current collector substrate prior to positioning said carbon layer against said current collector substrate.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/065,987 US5581438A (en) | 1993-05-21 | 1993-05-21 | Supercapacitor having electrodes with non-activated carbon fibers |
| US08/065,987 | 1993-05-21 | ||
| US08/631,680 US5649982A (en) | 1987-05-21 | 1996-04-10 | Process for manufacturing super capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2161444A1 true CA2161444A1 (en) | 1994-12-08 |
Family
ID=26746242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002161444A Abandoned CA2161444A1 (en) | 1993-05-21 | 1994-05-19 | Supercapacitor and process for manufacturing same |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5581438A (en) |
| EP (1) | EP0699337A1 (en) |
| JP (1) | JPH09506209A (en) |
| CA (1) | CA2161444A1 (en) |
| WO (1) | WO1994028563A1 (en) |
Families Citing this family (52)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5751541A (en) * | 1995-07-05 | 1998-05-12 | Motorola, Inc. | Polymer electrodes for energy storage devices and method of making same |
| JPH10275747A (en) * | 1997-03-28 | 1998-10-13 | Nec Corp | Electric double layer capacitor |
| US6205016B1 (en) * | 1997-06-04 | 2001-03-20 | Hyperion Catalysis International, Inc. | Fibril composite electrode for electrochemical capacitors |
| FR2793600B1 (en) * | 1999-05-10 | 2001-07-20 | Europ Accumulateurs | SUPERCAPTER, SUPERCAPTER, AND MANUFACTURING PROCESS |
| EP1204980A4 (en) * | 1999-07-12 | 2006-01-18 | Energy Storage Systems Pty Ltd | An energy storage device |
| JP2001185459A (en) * | 1999-10-15 | 2001-07-06 | Mitsubishi Chemicals Corp | Electrochemical capacitor |
| AU1772101A (en) * | 1999-11-16 | 2001-05-30 | Powercell Corporation | Capacitor development |
| US6522522B2 (en) | 2000-02-01 | 2003-02-18 | Cabot Corporation | Capacitors and supercapacitors containing modified carbon products |
| US6627252B1 (en) | 2000-05-12 | 2003-09-30 | Maxwell Electronic Components, Inc. | Electrochemical double layer capacitor having carbon powder electrodes |
| US6631074B2 (en) | 2000-05-12 | 2003-10-07 | Maxwell Technologies, Inc. | Electrochemical double layer capacitor having carbon powder electrodes |
| EP1202302B1 (en) * | 2000-09-26 | 2005-06-01 | Asahi Glass Company Ltd. | Process for producing an electrode assembly for an electric double layer capacitor |
| AUPR194400A0 (en) * | 2000-12-06 | 2001-01-04 | Energy Storage Systems Pty Ltd | An energy storage device |
| US6813139B2 (en) * | 2001-11-02 | 2004-11-02 | Maxwell Technologies, Inc. | Electrochemical double layer capacitor having carbon powder electrodes |
| US6643119B2 (en) | 2001-11-02 | 2003-11-04 | Maxwell Technologies, Inc. | Electrochemical double layer capacitor having carbon powder electrodes |
| US7517440B2 (en) * | 2002-07-17 | 2009-04-14 | Eksigent Technologies Llc | Electrokinetic delivery systems, devices and methods |
| US7235164B2 (en) | 2002-10-18 | 2007-06-26 | Eksigent Technologies, Llc | Electrokinetic pump having capacitive electrodes |
| US7791860B2 (en) | 2003-07-09 | 2010-09-07 | Maxwell Technologies, Inc. | Particle based electrodes and methods of making same |
| US7352558B2 (en) | 2003-07-09 | 2008-04-01 | Maxwell Technologies, Inc. | Dry particle based capacitor and methods of making same |
| US7920371B2 (en) | 2003-09-12 | 2011-04-05 | Maxwell Technologies, Inc. | Electrical energy storage devices with separator between electrodes and methods for fabricating the devices |
| US7090946B2 (en) | 2004-02-19 | 2006-08-15 | Maxwell Technologies, Inc. | Composite electrode and method for fabricating same |
| US7559356B2 (en) * | 2004-04-19 | 2009-07-14 | Eksident Technologies, Inc. | Electrokinetic pump driven heat transfer system |
| US7440258B2 (en) | 2005-03-14 | 2008-10-21 | Maxwell Technologies, Inc. | Thermal interconnects for coupling energy storage devices |
| US20070128472A1 (en) * | 2005-10-27 | 2007-06-07 | Tierney T K | Cell Assembly and Casing Assembly for a Power Storage Device |
| EP1957794B1 (en) | 2005-11-23 | 2014-07-02 | Eksigent Technologies, LLC | Electrokinetic pump designs and drug delivery systems |
| MX2009004309A (en) * | 2006-10-23 | 2009-08-07 | Axion Power Int Inc | Negative electrode for hybrid energy storage device. |
| US20090035657A1 (en) * | 2006-10-23 | 2009-02-05 | Buiel Edward R | Electrode for Hybrid Energy Storage Device and Method of Making Same |
| US8202653B2 (en) * | 2006-10-23 | 2012-06-19 | Axion Power International, Inc. | Electrode with reduced resistance grid and hybrid energy storage device having same |
| US20080113268A1 (en) * | 2006-10-23 | 2008-05-15 | Buiel Edward R | Recombinant Hybrid Energy Storage Device |
| US7881042B2 (en) * | 2006-10-26 | 2011-02-01 | Axion Power International, Inc. | Cell assembly for an energy storage device with activated carbon electrodes |
| WO2008130442A2 (en) * | 2006-10-31 | 2008-10-30 | Wisconsin Alumni Research Foundation | Nano porous composite electrode for use in a capacitor, capacitor, stacked cell, coiled cell and methods of manufacture and use thereof |
| US7867592B2 (en) | 2007-01-30 | 2011-01-11 | Eksigent Technologies, Inc. | Methods, compositions and devices, including electroosmotic pumps, comprising coated porous surfaces |
| EP2124723A1 (en) | 2007-03-07 | 2009-12-02 | Echo Therapeutics, Inc. | Transdermal analyte monitoring systems and methods for analyte detection |
| US8343572B2 (en) * | 2007-08-13 | 2013-01-01 | Ashish Varade | Composition of electrode material in the form of a coating and a process thereof |
| US20090103242A1 (en) * | 2007-10-19 | 2009-04-23 | Axion Power International, Inc. | Electrode with Reduced Resistance Grid and Hybrid Energy Storage Device Having Same |
| WO2009076134A1 (en) | 2007-12-11 | 2009-06-18 | Eksigent Technologies, Llc | Electrokinetic pump with fixed stroke volume |
| US20100258111A1 (en) * | 2009-04-07 | 2010-10-14 | Lockheed Martin Corporation | Solar receiver utilizing carbon nanotube infused coatings |
| WO2010124260A1 (en) | 2009-04-24 | 2010-10-28 | Lockheed Martin Corporation | Cnt-infused emi shielding composite and coating |
| US9111658B2 (en) | 2009-04-24 | 2015-08-18 | Applied Nanostructured Solutions, Llc | CNS-shielded wires |
| KR101696207B1 (en) | 2009-04-27 | 2017-01-13 | 어플라이드 나노스트럭처드 솔루션스, 엘엘씨. | Cnt-based resistive heating for deicing composite structures |
| US20110089958A1 (en) * | 2009-10-19 | 2011-04-21 | Applied Nanostructured Solutions, Llc | Damage-sensing composite structures |
| ES2751109T3 (en) | 2009-11-02 | 2020-03-30 | Cabot Corp | Lead-acid batteries and pastes therefor |
| CN102687316B (en) | 2009-11-02 | 2015-08-26 | 卡博特公司 | For the high surface low structure carbon black of stored energy application |
| US9167736B2 (en) | 2010-01-15 | 2015-10-20 | Applied Nanostructured Solutions, Llc | CNT-infused fiber as a self shielding wire for enhanced power transmission line |
| KR101787645B1 (en) | 2010-03-02 | 2017-10-23 | 어플라이드 나노스트럭처드 솔루션스, 엘엘씨. | Spiral wound electrical devices containing carbon nanotube-infused electrode materials and methods and apparatuses for production thereof |
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| EP2629595A2 (en) | 2010-09-23 | 2013-08-21 | Applied NanoStructured Solutions, LLC | CNT-infused fiber as a self shielding wire for enhanced power transmission line |
| CN103813814A (en) | 2011-05-05 | 2014-05-21 | 艾克西根特技术有限公司 | Gel coupling for electrokinetic delivery system |
| US20130143087A1 (en) * | 2011-12-01 | 2013-06-06 | Applied Nanostructured Solutions, Llc. | Core/shell structured electrodes for energy storage devices |
| US9085464B2 (en) | 2012-03-07 | 2015-07-21 | Applied Nanostructured Solutions, Llc | Resistance measurement system and method of using the same |
| JP2014197521A (en) * | 2013-03-29 | 2014-10-16 | 株式会社 東北テクノアーチ | Vanadium solid salt battery and method for manufacturing the same |
| WO2018140367A1 (en) | 2017-01-27 | 2018-08-02 | Cabot Corporation | Supercapacitors containing carbon black particles cleaned with an acid |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1984000246A1 (en) * | 1982-06-30 | 1984-01-19 | Matsushita Electric Ind Co Ltd | Double electric layer capacitor |
| SU1735925A1 (en) * | 1982-08-12 | 1992-05-23 | Научно-производственное объединение "Квант" | Reservoir capacitor electrode composition |
| US4597028A (en) * | 1983-08-08 | 1986-06-24 | Matsushita Electric Industrial Co., Ltd. | Electric double layer capacitor and method for producing the same |
| US4626964A (en) * | 1984-03-19 | 1986-12-02 | Hitachi Maxell, Ltd. | Electrical double layer capacitor and production of the same |
| US4906535A (en) * | 1987-07-06 | 1990-03-06 | Alupower, Inc. | Electrochemical cathode and materials therefor |
| JPH0240908A (en) * | 1988-08-01 | 1990-02-09 | Elna Co Ltd | Etching device |
| JPH02240911A (en) * | 1989-03-15 | 1990-09-25 | Matsushita Electric Ind Co Ltd | Electric double layer capacitor |
| DE69128805T2 (en) * | 1990-03-29 | 1998-05-14 | Matsushita Electric Ind Co Ltd | Electrolytic double layer capacitor and process for its manufacture |
-
1993
- 1993-05-21 US US08/065,987 patent/US5581438A/en not_active Expired - Lifetime
-
1994
- 1994-05-19 CA CA002161444A patent/CA2161444A1/en not_active Abandoned
- 1994-05-19 WO PCT/CA1994/000275 patent/WO1994028563A1/en not_active Application Discontinuation
- 1994-05-19 EP EP94915497A patent/EP0699337A1/en not_active Ceased
- 1994-05-19 JP JP7500048A patent/JPH09506209A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09506209A (en) | 1997-06-17 |
| US5581438A (en) | 1996-12-03 |
| EP0699337A1 (en) | 1996-03-06 |
| WO1994028563A1 (en) | 1994-12-08 |
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| Date | Code | Title | Description |
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| EEER | Examination request | ||
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 20030520 |