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Exfoliated graphite composite compositions for fuel cell flow field plates

United States Patent Application

View the Complete Application at the US Patent & Trademark Office
This invention provides an electrically conductive, less anisotropic, and structurally sound composite composition for fuel cell flow field plate or bipolar plate applications. The composition comprises: (a) expanded or exfoliated graphite; (b) particles of non-expandable graphite or carbon, wherein the particles are between 3% and 60% by weight based on the total weight of the particles and the expanded graphite; and (c) a binder or matrix material to bond the expanded graphite and the particles of non-expanded graphite or carbon for forming a highly conductive composite, wherein the binder or matrix material is between 3% and 60% by weight based on the total composite composition weight. The composite plate exhibits a thickness-direction conductivity typically greater than 35 S/cm, more typically greater than 50 S/cm, most typically greater than 100 S/cm, and a thickness-direction specific areal conductivity greater than 200 S/cm.sup.2, more typically greater than 500 S/cm.sup.2.
Zhamu, Aruna (Centerville, OH), Shi, Jinjun (Columbus, OH), Guo, Jiusheng (Centerville, OH), Jang, Bor Z. (Centerville, OH)
11/ 800,729
May 8, 2007
[0001] This invention is based on the research results of a project supported by the US Department of Energy (DOE) SBIR-STTR Program. The US government has certain rights on this invention.