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Process for producing laminated exfoliated graphite composite-metal compositions for fuel cell bipolar plate applications
Process for producing laminated exfoliated graphite composite-metal compositions for fuel cell bipolar plate applications
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机译:用于燃料电池双极板应用的层状剥离石墨复合金属组合物的生产方法
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摘要
A process for producing an electrically conductive laminate composition for fuel cell flow field plate or bipolar plate applications. The process comprises: (a) feeding a thin metal sheet, having a first surface and a second surface, into a consolidating zone; and (b) feeding a first exfoliated graphite composite sheet onto the first surface of the metal sheet to form a two-layer precursor laminate in this consolidating zone; wherein the exfoliated graphite composite sheet comprises (i) expanded or exfoliated graphite and (ii) a binder or matrix material to bond the expanded graphite to form a cohered. The process preferably further comprises (c) feeding a second exfoliated graphite composite sheet onto the second surface of the metal sheet to form a three-layer precursor laminate. Both the first and second exfoliated graphite composite sheet may further comprise particles of non-expandable graphite or carbon in the amount of between 3% and 60% by weight based on the total weight of the non-expandable particles and the expanded graphite. Surface flow channels and other desired geometric features can be built onto the exterior surfaces of the laminate to form a flow field plate or bipolar plate by a procedure such as in-line embossing or molding. The resulting laminate has an exceptionally high thickness-direction conductivity and excellent resistance to gas permeation.
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