Method of producing exfoliated graphite composite compositions for fuel cell flow field plates

Zhamu, Aruna; Shi, Jinjun; Guo, Jiusheng; Jang, Bor Z

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Title: Method of producing exfoliated graphite composite compositions for fuel cell flow field plates

Abstract

A method of producing an electrically conductive composite composition, which is particularly useful for fuel cell bipolar plate applications. The method comprises: (a) providing a supply of expandable graphite powder; (b) providing a supply of a non-expandable powder component comprising a binder or matrix material; (c) blending the expandable graphite with the non-expandable powder component to form a powder mixture wherein the non-expandable powder component is in the amount of between 3% and 60% by weight based on the total weight of the powder mixture; (d) exposing the powder mixture to a temperature sufficient for exfoliating the expandable graphite to obtain a compressible mixture comprising expanded graphite worms and the non-expandable component; (e) compressing the compressible mixture at a pressure within the range of from about 5 psi to about 50,000 psi in predetermined directions into predetermined forms of cohered graphite composite compact; and (f) treating the so-formed cohered graphite composite to activate the binder or matrix material thereby promoting adhesion within the compact to produce the desired composite composition. Preferably, the non-expandable powder component further comprises an isotropy-promoting agent such as non-expandable graphite particles. Further preferably, step (e) comprises compressing the mixture in at least two directions. The methodmore » « less

Inventors:: Zhamu, Aruna; Shi, Jinjun; Guo, Jiusheng; Jang, Bor Z

Issue Date:: Tue Apr 08 00:00:00 EDT 2014

Research Org.:: Nanotek Instruments, Inc., Dayton, OH (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1129176

Patent Number(s):: 8691129

Application Number:: 11/800,730

Assignee:: Nanotek Instruments, Inc. (Dayton, OH)

Patent Classifications (CPCs):: B - PERFORMING OPERATIONS B22 - CASTING B22F - WORKING METALLIC POWDER

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B - PERFORMING OPERATIONS B22 - CASTING B22F - WORKING METALLIC POWDER
B22F2998/10 - Processes characterised by the sequence of their steps
B22F3/02 - Compacting only

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Resource Type:: Patent

Resource Relation:: Patent File Date: 2007 May 08

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

Citation Formats


                    Zhamu, Aruna, Shi, Jinjun, Guo, Jiusheng, and Jang, Bor Z. Method of producing exfoliated graphite composite compositions for fuel cell flow field plates.  United States: N. p., 2014. 
        Web.

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                    Zhamu, Aruna, Shi, Jinjun, Guo, Jiusheng, & Jang, Bor Z. Method of producing exfoliated graphite composite compositions for fuel cell flow field plates.  United States.

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                    Zhamu, Aruna, Shi, Jinjun, Guo, Jiusheng, and Jang, Bor Z. Tue .  
        "Method of producing exfoliated graphite composite compositions for fuel cell flow field plates".  United States.  https://www.osti.gov/servlets/purl/1129176.

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@article{osti_1129176,

  title        = {Method of producing exfoliated graphite composite compositions for fuel cell flow field plates},

  author       = {Zhamu, Aruna and Shi, Jinjun and Guo, Jiusheng and Jang, Bor Z},

  abstractNote = {A method of producing an electrically conductive composite composition, which is particularly useful for fuel cell bipolar plate applications. The method comprises: (a) providing a supply of expandable graphite powder; (b) providing a supply of a non-expandable powder component comprising a binder or matrix material; (c) blending the expandable graphite with the non-expandable powder component to form a powder mixture wherein the non-expandable powder component is in the amount of between 3% and 60% by weight based on the total weight of the powder mixture; (d) exposing the powder mixture to a temperature sufficient for exfoliating the expandable graphite to obtain a compressible mixture comprising expanded graphite worms and the non-expandable component; (e) compressing the compressible mixture at a pressure within the range of from about 5 psi to about 50,000 psi in predetermined directions into predetermined forms of cohered graphite composite compact; and (f) treating the so-formed cohered graphite composite to activate the binder or matrix material thereby promoting adhesion within the compact to produce the desired composite composition. Preferably, the non-expandable powder component further comprises an isotropy-promoting agent such as non-expandable graphite particles. Further preferably, step (e) comprises compressing the mixture in at least two directions. The method leads to composite plates with exceptionally high thickness-direction electrical conductivity.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Tue Apr 08 00:00:00 EDT 2014},

  month        = {Tue Apr 08 00:00:00 EDT 2014}

}

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Composite bipolar plate for electrochemical cells
patent, June 2001

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Similar Records

Title: Method of producing exfoliated graphite composite compositions for fuel cell flow field plates

Abstract

Citation Formats

Epoxy curing agent patent, August 1978

Vermicular expanded graphite composite material patent, May 1981

Housing for electrical or electronic equipment patent, July 1985

Low-density graphite-polymer electrical conductors patent, November 1987

Reinforced flexible graphite sheet patent, March 1988

Composites of in-situ exfoliated graphite patent, August 1990

Laminated fluid flow field assembly for electrochemical fuel cells patent, April 1994

Method of fabricating an embossed fluid flow field plate patent, June 1996

Flexible graphite composite patent, March 1999

Bipolar plate/diffuser for a proton exchange membrane fuel cell patent, March 2000

Flexible graphite composite for use in the form of a fuel cell flow field plate patent, March 2000

Bipolar plate/diffuser for a proton exchange membrane fuel cell patent, January 2001

Composite bipolar plate for electrochemical cells patent, June 2001

Flexible graphite article and method of manufacture patent, August 2002

Flexible graphite article and method of manufacture patent, March 2004

Impregnated bodies made of expanded graphite, process for producing such bodies and sealing elements, fuel cell components and heat-conducting elements formed of the bodies patent, June 2004

Separator for fuel cell, process for production thereof, and solid polymer type fuel cell using said separator patent, April 2005

Fuel cell separator, process for production thereof, and polymer electrolyte fuel cell patent, September 2005

Methacrylate impregnated carbonaceous parts patent-application, November 2001

Graphite article having predetermined anisotropic characteristics and process therefor patent-application, November 2002

Highly conductive thermoplastic composites for rapid production of fuel cell bipolar plates patent-application, November 2004

Conductive resin molding patent-application, June 2005

Method for producing composite objects using expanded graphite and vermiculite patent-application, January 2007

Epoxy curing agent
patent, August 1978

Vermicular expanded graphite composite material
patent, May 1981

Housing for electrical or electronic equipment
patent, July 1985

Low-density graphite-polymer electrical conductors
patent, November 1987

Reinforced flexible graphite sheet
patent, March 1988

Composites of in-situ exfoliated graphite
patent, August 1990

Laminated fluid flow field assembly for electrochemical fuel cells
patent, April 1994

Method of fabricating an embossed fluid flow field plate
patent, June 1996

Flexible graphite composite
patent, March 1999

Bipolar plate/diffuser for a proton exchange membrane fuel cell
patent, March 2000

Flexible graphite composite for use in the form of a fuel cell flow field plate
patent, March 2000

Bipolar plate/diffuser for a proton exchange membrane fuel cell
patent, January 2001

Composite bipolar plate for electrochemical cells
patent, June 2001

Flexible graphite article and method of manufacture
patent, August 2002

Flexible graphite article and method of manufacture
patent, March 2004

Impregnated bodies made of expanded graphite, process for producing such bodies and sealing elements, fuel cell components and heat-conducting elements formed of the bodies
patent, June 2004

Separator for fuel cell, process for production thereof, and solid polymer type fuel cell using said separator
patent, April 2005

Fuel cell separator, process for production thereof, and polymer electrolyte fuel cell
patent, September 2005

Methacrylate impregnated carbonaceous parts
patent-application, November 2001

Graphite article having predetermined anisotropic characteristics and process therefor
patent-application, November 2002

Highly conductive thermoplastic composites for rapid production of fuel cell bipolar plates
patent-application, November 2004

Conductive resin molding
patent-application, June 2005

Method for producing composite objects using expanded graphite and vermiculite
patent-application, January 2007