ATE213874T1 - Kontinuierliches verfahren zur herstellung einer laminierten elektrolyt-elektrodenanordung - Google Patents
Kontinuierliches verfahren zur herstellung einer laminierten elektrolyt-elektrodenanordungInfo
- Publication number
- ATE213874T1 ATE213874T1 AT98960972T AT98960972T ATE213874T1 AT E213874 T1 ATE213874 T1 AT E213874T1 AT 98960972 T AT98960972 T AT 98960972T AT 98960972 T AT98960972 T AT 98960972T AT E213874 T1 ATE213874 T1 AT E213874T1
- Authority
- AT
- Austria
- Prior art keywords
- catalyst
- electrolyte
- layers
- layer
- laminated
- Prior art date
Links
- 239000003792 electrolyte Substances 0.000 title abstract 7
- 238000010924 continuous production Methods 0.000 title 1
- 239000003054 catalyst Substances 0.000 abstract 8
- 238000010030 laminating Methods 0.000 abstract 3
- 238000000034 method Methods 0.000 abstract 3
- 238000011065 in-situ storage Methods 0.000 abstract 2
- 238000011437 continuous method Methods 0.000 abstract 1
- 239000002001 electrolyte material Substances 0.000 abstract 1
- 238000001125 extrusion Methods 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/08—Hollow fibre membranes
- B01D69/087—Details relating to the spinning process
- B01D69/088—Co-extrusion; Co-spinning
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
- C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
- C25B9/23—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms comprising ion-exchange membranes in or on which electrode material is embedded
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1004—Fuel cells with solid electrolytes characterised by membrane-electrode assemblies [MEA]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/40—Details relating to membrane preparation in-situ membrane formation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/10—Catalysts being present on the surface of the membrane or in the pores
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0065—Solid electrolytes
- H01M2300/0082—Organic polymers
-
- 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
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Energy (AREA)
- Sustainable Development (AREA)
- Manufacturing & Machinery (AREA)
- Fuel Cell (AREA)
- Inert Electrodes (AREA)
- Primary Cells (AREA)
- Secondary Cells (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US6879797P | 1997-12-24 | 1997-12-24 | |
US09/216,207 US6291091B1 (en) | 1997-12-24 | 1998-12-18 | Continuous method for manufacturing a Laminated electrolyte and electrode assembly |
PCT/CA1998/001160 WO1999034466A1 (en) | 1997-12-24 | 1998-12-22 | Continuous method for manufacturing a laminated electrolyte and electrode assembly |
Publications (1)
Publication Number | Publication Date |
---|---|
ATE213874T1 true ATE213874T1 (de) | 2002-03-15 |
Family
ID=26749395
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT98960972T ATE213874T1 (de) | 1997-12-24 | 1998-12-22 | Kontinuierliches verfahren zur herstellung einer laminierten elektrolyt-elektrodenanordung |
Country Status (7)
Country | Link |
---|---|
US (1) | US6291091B1 (de) |
EP (1) | EP1042837B1 (de) |
JP (1) | JP2002500422A (de) |
AT (1) | ATE213874T1 (de) |
AU (1) | AU1657399A (de) |
CA (1) | CA2312162A1 (de) |
WO (1) | WO1999034466A1 (de) |
Families Citing this family (52)
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TW431004B (en) * | 1998-10-29 | 2001-04-21 | Toshiba Corp | Nonaqueous electrolyte secondary battery |
CN1178319C (zh) * | 1999-02-19 | 2004-12-01 | 阿姆泰克研究国际公司 | 导电的独立式微孔聚合物板 |
US6503432B1 (en) | 2000-03-02 | 2003-01-07 | E. I. Du Pont De Nemours And Company | Process for forming multilayer articles by melt extrusion |
EP1229602B1 (de) * | 2000-07-06 | 2010-11-24 | Panasonic Corporation | Herstellungsverfahren für aus filmelektroden zusammengesetzes produkt, und herstellungsverfahren für festpolymer-elektrolyt-brennstoffzelle |
CN1214478C (zh) * | 2000-07-06 | 2005-08-10 | 松下电器产业株式会社 | 电解质膜电极接合体的制造方法 |
US6524736B1 (en) | 2000-10-18 | 2003-02-25 | General Motors Corporation | Methods of preparing membrane electrode assemblies |
US6585846B1 (en) * | 2000-11-22 | 2003-07-01 | 3M Innovative Properties Company | Rotary converting apparatus and method for laminated products and packaging |
DE10065074A1 (de) * | 2000-12-23 | 2002-07-04 | Forschungszentrum Juelich Gmbh | Verfahren zur Abscheidung eines Katalysators |
US6653009B2 (en) | 2001-10-19 | 2003-11-25 | Sarnoff Corporation | Solid oxide fuel cells and interconnectors |
WO2003047018A1 (fr) * | 2001-11-30 | 2003-06-05 | Honda Giken Kogyo Kabushiki Kaisha | Procede de fabrication d'electrode de pile a combustible |
US6858341B2 (en) * | 2002-05-21 | 2005-02-22 | Idatech, Llc | Bipolar plate assembly, fuel cell stacks and fuel cell systems incorporating the same |
US7147959B2 (en) * | 2002-05-31 | 2006-12-12 | Umicore Ag & Co. Kg | Process for the manufacture of membrane-electrode-assemblies using catalyst-coated membranes |
US6933003B2 (en) | 2002-06-13 | 2005-08-23 | General Motors Corporation | Method of making membrane electrode assemblies |
US20060057281A1 (en) * | 2002-07-29 | 2006-03-16 | Shintaro Izumi | Method for manufacturing membrane electrode assembly for fuel cell |
US7108773B2 (en) * | 2002-09-11 | 2006-09-19 | The Board Of Trustees Of The University Of Illinois | Solids supporting mass transfer for fuel cells and other applications and solutions and methods for forming |
JP2006508509A (ja) * | 2002-12-02 | 2006-03-09 | アヴェスター リミティッド パートナーシップ | リチウムポリマー電池用の薄膜電気化学セルの共押出し製造プロセス、およびそのための装置 |
US6942943B2 (en) * | 2003-02-10 | 2005-09-13 | Fuelcell Energy, Inc. | Catalyst and/or electrolyte loaded plate and method of making same |
CA2761286C (en) | 2003-09-18 | 2013-10-29 | Bathium Canada Inc. | Stacking apparatus and method for assembly of polymer batteries |
JP4529439B2 (ja) * | 2003-12-26 | 2010-08-25 | トヨタ自動車株式会社 | 燃料電池の製造方法と製造装置 |
KR100760492B1 (ko) * | 2004-03-22 | 2007-10-04 | 이비덴 가부시키가이샤 | 고체 고분자 전해질형 연료전지 |
US20050242471A1 (en) * | 2004-04-30 | 2005-11-03 | Bhatt Sanjiv M | Methods for continuously producing shaped articles |
US20060093890A1 (en) * | 2004-10-29 | 2006-05-04 | Steinbroner Matthew P | Fuel cell stack compression systems, and fuel cell stacks and fuel cell systems incorporating the same |
KR100670284B1 (ko) * | 2005-02-04 | 2007-01-16 | 삼성에스디아이 주식회사 | 연료전지 |
US20060246331A1 (en) * | 2005-04-29 | 2006-11-02 | Steinbroner Matthew P | Partitioned fuel cell stacks and fuel cell systems including the same |
JP4812331B2 (ja) * | 2005-05-13 | 2011-11-09 | トヨタ自動車株式会社 | 燃料電池用接合体の製造方法及び燃料電池用接合体の製造装置 |
JP5093870B2 (ja) * | 2005-07-07 | 2012-12-12 | 富士フイルム株式会社 | 固体電解質複層フィルムの製造方法 |
JP4969126B2 (ja) * | 2005-07-07 | 2012-07-04 | 富士フイルム株式会社 | 固体電解質フィルム及びその製造方法、製造設備並びに電極膜複合体及び燃料電池 |
FR2892861B1 (fr) * | 2005-11-02 | 2013-07-05 | Commissariat Energie Atomique | Procede de fabrication d'un assemblage "electrode-membrane- electrode" de type ccb en continu |
JP4969131B2 (ja) * | 2006-03-30 | 2012-07-04 | 富士フイルム株式会社 | 固体電解質フィルム及びその製造方法、製造設備、並びに電極膜複合体、燃料電池 |
JP4969132B2 (ja) * | 2006-03-30 | 2012-07-04 | 富士フイルム株式会社 | 固体電解質フィルム及びその製造方法、製造設備、並びに電極膜複合体、燃料電池 |
JP4969133B2 (ja) * | 2006-03-30 | 2012-07-04 | 富士フイルム株式会社 | 固体電解質フィルム及びその製造方法、並びに電極膜複合体、燃料電池 |
US8288059B2 (en) * | 2006-12-15 | 2012-10-16 | 3M Innovative Properties Company | Processing methods and systems for assembling fuel cell perimeter gaskets |
US8012284B2 (en) | 2006-12-15 | 2011-09-06 | 3M Innovative Properties Company | Method and apparatus for fabricating roll good fuel cell subassemblies |
KR100957302B1 (ko) * | 2007-09-07 | 2010-05-12 | 현대자동차주식회사 | 연료전지용 막-전극 접합체의 제조방법 |
US9056449B2 (en) | 2007-10-01 | 2015-06-16 | Intelligent Energy Limited | Methods of manufacturing electrochemical cells |
JP5304132B2 (ja) * | 2008-09-22 | 2013-10-02 | 凸版印刷株式会社 | 膜電極接合体の製造方法 |
WO2013036801A1 (en) | 2011-09-07 | 2013-03-14 | 24M Technologies, Inc. | Semi-solid electrode cell having a porous current collector and methods of manufacture |
EP2735047B1 (de) | 2011-09-15 | 2018-04-04 | Siemens Aktiengesellschaft | Verfahren zur trockenherstellung einer membran-elektroden-einheit, membran-elektroden-einheit sowie walzanordnung |
US9890464B2 (en) | 2012-01-12 | 2018-02-13 | Oceanit Laboratories, Inc. | Solid electrolyte/electrode assembly for electrochemical surface finishing applications |
US9401501B2 (en) | 2012-05-18 | 2016-07-26 | 24M Technologies, Inc. | Electrochemical cells and methods of manufacturing the same |
US9337471B2 (en) * | 2012-12-27 | 2016-05-10 | Palo Alto Research Center Incorporated | Co-extrusion print head for multi-layer battery structures |
US10240244B2 (en) | 2014-03-12 | 2019-03-26 | Oceanit Laboratories, Inc. | Portable, liquid free, electroless, electrochemical deposition of metal on conductive and nonconductive surfaces |
WO2015167582A1 (en) * | 2014-05-02 | 2015-11-05 | Oceanit Laboratories, Inc. | Electrochemical deposition of metal on surfaces |
EP3979358B1 (de) | 2014-11-05 | 2023-08-02 | 24m Technologies, Inc. | Elektrochemische zellen mit halbfesten elektroden und verfahren zu deren herstellung |
US10115970B2 (en) | 2015-04-14 | 2018-10-30 | 24M Technologies, Inc. | Semi-solid electrodes with porous current collectors and methods of manufacture |
AU2016280285B2 (en) | 2015-06-18 | 2021-07-01 | 24M Technologies, Inc. | Single pouch battery cells and methods of manufacture |
JP6660174B2 (ja) * | 2015-12-22 | 2020-03-11 | パナソニック株式会社 | 電極の製造方法、及び膜電極接合体の製造方法 |
US11466355B1 (en) | 2016-07-20 | 2022-10-11 | Oceanit Laboratories, Inc. | Submerged underwater electroless, electrochemical deposition of metal on conductive and nonconductive surfaces |
KR102677353B1 (ko) * | 2018-09-21 | 2024-06-21 | 아사히 가세이 가부시키가이샤 | 적층체 제조용 지그, 적층체의 제조 방법, 곤포체, 적층체, 전해조, 및 전해조의 제조 방법 |
CN109876984A (zh) * | 2019-04-02 | 2019-06-14 | 深圳晓兰联泰氢能源高科技有限公司 | 一种在质子膜表面涂布催化剂层的设备及方法 |
US11742525B2 (en) | 2020-02-07 | 2023-08-29 | 24M Technologies, Inc. | Divided energy electrochemical cell systems and methods of producing the same |
CN112428554A (zh) * | 2020-10-29 | 2021-03-02 | 青海百能汇通新能源科技有限公司 | 碳毡复合电池极板及其生产方法、碳毡复合压延设备和液流电池 |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4157432A (en) | 1977-11-29 | 1979-06-05 | Exxon Research & Engineering Co. | Bulk sulfonation process |
US4645602A (en) | 1981-12-18 | 1987-02-24 | Barnes Jr Robert G | Process for producing reinforced microporous membrane |
US4437952A (en) | 1982-01-04 | 1984-03-20 | E. I. Du Pont De Nemours & Co. | Coextruded multilayer cation exchange membranes |
US5591315A (en) * | 1987-03-13 | 1997-01-07 | The Standard Oil Company | Solid-component membranes electrochemical reactor components electrochemical reactors use of membranes reactor components and reactor for oxidation reactions |
US4954388A (en) | 1988-11-30 | 1990-09-04 | Mallouk Robert S | Fabric reinforced composite membrane |
US5290642A (en) * | 1990-09-11 | 1994-03-01 | Alliedsignal Aerospace | Method of fabricating a monolithic solid oxide fuel cell |
US5447636A (en) | 1993-12-14 | 1995-09-05 | E. I. Du Pont De Nemours And Company | Method for making reinforced ion exchange membranes |
US5536278A (en) | 1994-03-23 | 1996-07-16 | Hydro-Quebec | Process for assembling LPB batteries |
US5599614A (en) | 1995-03-15 | 1997-02-04 | W. L. Gore & Associates, Inc. | Integral composite membrane |
US6054230A (en) | 1994-12-07 | 2000-04-25 | Japan Gore-Tex, Inc. | Ion exchange and electrode assembly for an electrochemical cell |
DE19509748C2 (de) | 1995-03-17 | 1997-01-23 | Deutsche Forsch Luft Raumfahrt | Verfahren zur Herstellung eines Verbundes aus Elektrodenmaterial, Katalysatormaterial und einer Festelektrolytmembran |
DE19509749C2 (de) | 1995-03-17 | 1997-01-23 | Deutsche Forsch Luft Raumfahrt | Verfahren zur Herstellung eines Verbundes aus Elektrodenmaterial, Katalysatormaterial und einer Festelektrolytmembran |
GB9507012D0 (en) | 1995-04-05 | 1995-05-31 | Johnson Matthey Plc | Improved electrode |
DE19548422A1 (de) | 1995-12-22 | 1997-09-11 | Hoechst Ag | Materialverbunde und ihre kontinuierliche Herstellung |
DE19548421B4 (de) | 1995-12-22 | 2004-06-03 | Celanese Ventures Gmbh | Verfahren zur kontinuierlichen Herstellung von Membranelektrodeneinheiten |
US6001500A (en) | 1996-06-05 | 1999-12-14 | Southwest Res Inst | Cylindrical proton exchange membrane fuel cells and methods of making same |
-
1998
- 1998-12-18 US US09/216,207 patent/US6291091B1/en not_active Expired - Fee Related
- 1998-12-22 AU AU16573/99A patent/AU1657399A/en not_active Abandoned
- 1998-12-22 CA CA002312162A patent/CA2312162A1/en not_active Abandoned
- 1998-12-22 AT AT98960972T patent/ATE213874T1/de active
- 1998-12-22 EP EP98960972A patent/EP1042837B1/de not_active Expired - Lifetime
- 1998-12-22 WO PCT/CA1998/001160 patent/WO1999034466A1/en active IP Right Grant
- 1998-12-22 JP JP2000526989A patent/JP2002500422A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
WO1999034466A1 (en) | 1999-07-08 |
EP1042837A1 (de) | 2000-10-11 |
CA2312162A1 (en) | 1999-07-08 |
AU1657399A (en) | 1999-07-19 |
US6291091B1 (en) | 2001-09-18 |
EP1042837B1 (de) | 2002-02-27 |
JP2002500422A (ja) | 2002-01-08 |
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