Method of producing fuel cell separator, fuel separator, and polymer electrolyte fuel cell
申请人:Nisshinbo Industries, Inc.
公开号:US20040146771A1
公开(公告)日:2004-07-29
Disclosed are a method of producing a fuel cell separator. In this method, dry granules of a composition for a fuel cell separator mainly containing a conductive material, a binder, and an additive are produced by mixing raw materials including at least the conductive material, the binder, and the additive, granulating the resultant mixture to obtain granules, and drying the granules. The dry granules may be further sized. Then, the granules are packed in a mold, and hot-press molded. This method is characterized in that the granules have a residual volatile matter content in a range of 4 wt % or less, and an average particle size in a range of 200 to 700 &mgr;m (60 to 160 &mgr;m for the sized granules) and a specific particle size distribution. With this method, a fuel cell separator having a high elasticity, an excellent dimensional accuracy, and a high gas non-permeability can be produced with no molding failures, accordingly, with a uniform quality. Further, a solid polymer electrolyte fuel cell having a high gas sealing characteristic and an excellent impact resistance can be produced by using the above high quality fuel cell separators as part or all of separators in the fuel cell.
本发明公开了一种生产燃料电池隔膜的方法。在该方法中,通过混合至少包括导电材料、粘合剂和添加剂的原材料,将所得混合物造粒以获得颗粒,并干燥颗粒,从而生产出主要包含导电材料、粘合剂和添加剂的燃料电池隔膜组合物的干颗粒。干燥后的颗粒可进一步调整大小。然后,将颗粒装入模具并热压成型。这种方法的特点是,颗粒的残余挥发物含量在 4 wt % 或更低的范围内,平均粒径在 200 至 700 &mgr;m 的范围内(粒径为 60 至 160 &mgr;m),并具有特定的粒径分布。通过这种方法,可以生产出具有高弹性、优异的尺寸精度和高气体不渗透性的燃料电池隔膜,而且不会出现成型故障,质量均匀一致。此外,使用上述高质量燃料电池隔膜作为燃料电池中的部分或全部隔膜,可以生产出具有高气体密封特性和优异抗冲击性能的固体聚合物电解质燃料电池。