发明申请
- 专利标题: Laminated exfoliated graphite composite-metal compositions for fuel cell flow field plate or bipolar plate applications
- 专利标题(中): 用于燃料电池流场板或双极板应用的层压剥离石墨复合金属组合物
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申请号: US11807379申请日: 2007-05-29
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公开(公告)号: US20080299419A1公开(公告)日: 2008-12-04
- 发明人: Aruna Zhamu , Jinjun Shi , Jiusheng Guo , Bor Z. Jang
- 申请人: Aruna Zhamu , Jinjun Shi , Jiusheng Guo , Bor Z. Jang
- 主分类号: H01M8/02
- IPC分类号: H01M8/02
摘要:
An electrically conductive laminate composition for fuel cell flow field plate or bipolar plate applications. The laminate composition comprises at least a thin metal sheet having two opposed exterior surfaces and a first exfoliated graphite composite sheet bonded to the first of the two exterior surfaces of the metal sheet wherein the exfoliated graphite composite sheet comprises: (a) expanded or exfoliated graphite and (b) a binder or matrix material to bond the expanded graphite for forming a cohered sheet, wherein the binder or matrix material is between 3% and 60% by weight based on the total weight of the first exfoliated graphite composite sheet. Preferably, the first exfoliated graphite composite sheet further comprises 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. Further preferably, the laminate comprises a second exfoliated graphite composite sheet bonded to the second surface of the metal sheet to form a three-layer laminate. 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. The resulting laminate has an exceptionally high thickness-direction conductivity and excellent resistance to gas permeation.
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