石墨/聚合物复合双极板的制备与性能表征  

PREPARATION AND CHARACTERISTICS OF GRAPHITE/POLYMER COMPOSITE BIPOLAR PLATES

作　　者：陈惠[1] 李建新[1] 刘洪波[1] 张莉莉[1] 谢文[1] 刘治中[1] 

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《炭素技术》2008年第5期16-20,共5页Carbon Techniques

摘　　要：以石墨为导电骨料,高分子聚合物为粘结剂,通过模压成型制备质子交换膜燃料电池双极板。主要探讨了导电骨料种类、粘结剂种类、导电骨料的粒度分布、石墨的表面处理及其增强纤维表面处理对双极板性能的影响。实验结果表明:各种影响因素对材料密度影响不大,但对导电性和抗折强度的影响很大;用天然石墨作导电骨料的样品性能明显优于用人造石墨作导电骨料的样品性能;用改性树脂为粘结剂的样品的性能优于其他各种未改性树脂为粘结剂的样品性能。最佳的实验条件为:用天然石墨A和C作导电骨料,改性树脂R3和自制树脂R6作粘结剂,石墨的粒度分布为-160～+200目或-200～+325目,石墨用98%的浓硫酸处理,纤维选用酒精处理以增强纤维与树脂间的结合力。The bipolar plates for proton exchange membrane fuel celI（PEMFC） were prepared using graphite as conductive fillers, macromolecule polymer as binder through moulding method. The influences of different conductive fillers, resin, graphite particle distributions, surface treatment of graphite and carbon fiber on the properties of bipolar plate were investigated. Results show that the influence of every factor on the density of the bipolar plates is not obvious, but it is obvious on the conductivity and flexural strength. The properties of bipolar plate using natural graphite as conductive filler, modified resin as binder are better than that using artifical graphite and unmodified resin. Within a certain size range, larger particles result in higher sample conductivities. There appear to be distinct advantages with intermediate graphite particle size and relatively narrow distributions （ -160- ＋200,-200- ＋325） . The conductivities and flexural strength of sample are improved using the graphite treated with H2SO4 solution as conductive fillers. It is necessary for surface treatments of fibers to improve the strength.

关 键 词：燃料电池 双极板 复合材料 石墨 聚合物 

分 类 号：TM911.15[电气工程—电力电子与电力传动]