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全钒液流电池用磺化聚醚醚酮隔膜的制备及性能研究

DOI: 10.3724/SP.J.1105.2013.13108, PP. 1476-1482

Keywords: 离子交换膜,磺化聚醚醚酮,钒离子渗透率,电池效率

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Abstract:

采用浓硫酸为磺化剂,制备不同磺化度下的聚醚醚酮(PEEK)膜,研究不同磺化度下SPEEK膜的离子交换容量、面电阻、含水量、钒离子渗透率等参数,并选取磺化度为60%的膜进行单电池性能测试.结果表明,XRD测试显示SPEEK的结晶性下降,随着磺化度的升高,离子交换容量增加,含水量升高,钒离子渗透率升高.磺化度为60%的SPEEK膜(SPEEK60)相比Nafion117拥有更低的钒离子渗透率,离子选择性为Nafion117的10倍.在单电池的测试系统中,SPEEK60具有较高的库伦效率(CE)和能量效率(EE),在自放电测试中,SPEEK60自放电时间为Nafion117的2.5倍,通过循环测试隔膜性能稳定,充放电比较理想.SPEEK膜有希望成为新型离子交换膜应用于全钒液流电池中.

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