膨胀石墨/酚醛树脂复合材料双极板研究

Study on expanded graphite/phenolic resin carbon composite bipolar plate

以膨胀石墨为导电骨料、炭黑为添加剂、酚醛树脂为黏结剂,采用模压成形工艺制备质子交换膜燃料电池用膨胀石墨/酚醛树脂复合材料双极板。考察树脂含量、成形压力、添加剂用量及添加剂加入方式对复合材料双极板性能的影响。研究结果表明:上述因素对复合材料双极板的性能影响较大,黏结剂的加入量(质量分数)为20%～30%、压力在10～12 MPa较为合适;炭黑对复合材料双极板的性能影响比较复杂,在实验用炭黑范围内,随着炭黑用量的增加,电导率增大较快,抗折强度先增大后减小;在复合材料的混料过程中,将炭黑添加在树脂中,制备的复合材料双极板性能比炭黑添加在膨胀石墨性能好。

Expanded graphite/phenolic resin composite bipolar plates used for polymer electrolyte membrane fuel cells（PEMFC） were prepared through a compression molding process.The conductivity and flexural strength of the composite bipolar plate were measured with four-point probe method and three point bending technique respectively.The influences of resin content,molding pressure,additive content and adding manner of additive on the performance of the composite bipolar plate were investigated.The results show that resin content,molding pressure,additive content and adding manner of additive have a grate influence on the performance of the composite bipolar plate.Resin content of 20%-30% and molding pressure of 10-12 MPa are appropriate.Influences of carbon black on the properities of composite bipolar plate are complicated.In the range of carbon black used in experiment,the conductivity increases and flexural strength increases firstly and then decreases with the increase of the carbon black.When carbon black is added to resin,the properities of composite bipolar plate are better.