燃料电池复合材料双极板的制备与性能研究

双极板是燃料电池中的重要组成部分,采用模压热固化二步法,以树脂为粘结剂、天然鳞片石墨作导电骨料、碳黑为添加剂制备燃料电池复合材料双极板.系统考察了树脂含量、溶剂比、碳黑含量、成型压力、保压时间以及固化温度等因素对复合材料双极板性能的影响.结果表明,随着粘结剂含量的增加,双极板的电导率减小,抗折强度增大;碳黑的添加可有效地提高其电导率,但强度会有一定程度的减小;增大成型压力和延长保压时间可提高双极板的导电性和强度;最终固化温度主要影响粘结的交联程度.制备天然石墨/聚合物复合材料双极板的最佳条件为:聚合物树脂含量为20%,碳黑含量为4%～5%,溶剂比为1.0,成型压力为10～12MPa,固化温度为180℃.

Preparation and properties of composite bipolar plate for PEMFC

Modified phenolic resin,natural graphite and carbon black were chosen to prepare graphite/phenolic resin composite bipolar plate with high performance by compression molding in this paper.The influences of resin content,carbon black content,ratio of solvent,molding pressure,curing temperature and molding time on properties of the composite bipolar plate were investigated.Results show that the conductivity of the composite bipolar plate increases and the flexural strength decreases with the increasing binder...