质子交换膜是液流电池的核心部件之一.以6F-双酚A(6F-BPA) 、二氟二苯甲酮(DFBP)及磺化二氟二苯甲酮(SDFBP)为共聚单体,经由逐步缩聚反应,通过调整DFBP与SDFBP的投料比,合成了3种含氟磺化聚芳醚酮,采用溶液浇铸成膜的方法制备成质子交换膜.傅立叶红外、核磁氢谱及离子交换容量的表征结果表明所合成聚合物的结构与目标产物的结构相一致.当SDFBP与DFBP的投料比为1∶1时,所制备的质子交换膜具有最高的H+传导选择性,所组装的钒流电池在充放电流为50 mA/cm2时,电池的库仑效率、电压效率、能量效率分别达到95%,78%,74%,优于同等条件下Nafion 117膜的性能.
Proton exchange membrane is a key part of vanadium redox flow battery (VRFB).Three type of fluorine-containing sulfonated poly(fluorenyl ether ketone)s (SPEEK-6Fs) with different ion exchange capacity (IEC) were synthesized from sulfonated-4, 4′-difluorobenzophenone (SDFBP), 4, 4′-difluorobenzophenone (DFBP) and hexafluoro bisphenol A(6FBPA) by changing the molar ratio of the SDFBP and DFBP.The SPEEK-6Fs were fabricated into membranes by solution cast using DMSO as solvent.The structure of the synthesized SPEEK-6F was verified by characterization of FT-IR, NMR and ion exchange content.The results show that the structure of the synthesized SPEEK-6F was as same as the desired product''s.The prepared membrane has best H+ selectivity when the molar ratio of the monomer SDFBP and DFBP is 1∶1.The membrane made from SPEEK-6F50 has better comprehensive performance of single VRFB than Nafion117 with 95% of coulombic efficiency, 78% of voltage efficiency and 74% of energy efficiency, when the charge-discharge current is 50 mA/cm2.
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