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Highly conductive composites for fuel cell flow field plates and bipolar plates

United States Patent Application

20070154771
A1
View the Complete Application at the US Patent & Trademark Office
This invention provides a fuel cell flow field plate or bipolar plate having flow channels on faces of the plate, comprising an electrically conductive polymer composite. The composite is composed of (A) at least 50% by weight of a conductive filler, comprising at least 5% by weight reinforcement fibers, expanded graphite platelets, graphitic nano-fibers, and/or carbon nano-tubes; (B) polymer matrix material at 1 to 49.9% by weight; and (C) a polymer binder at 0.1 to 10% by weight; wherein the sum of the conductive filler weight %, polymer matrix weight % and polymer binder weight % equals 100% and the bulk electrical conductivity of the flow field or bipolar plate is at least 100 S/cm. The invention also provides a continuous process for cost-effective mass production of the conductive composite-based flow field or bipolar plate.
Jang, Bor Z. (Centerville, OH), Zhamu, Aruna (Centerville, OH), Song, Lulu (Centerville, OH)
11/ 324,370
January 4, 2006
[0001] The present invention is based on the research results of a project supported by the US Department of Energy SBIR-STTR Program. The US government has certain rights on this invention.