Advanced acid-base blend ion exchange membranes with high performance for vanadium flow battery application
Advanced acid-base blend ion exchange membranes with high performance for vanadium flow battery application
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DOI：
10.1016/j.memsci.2018.02.039
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发表时间：
2018-05-01
影响因子：
9.5
通讯作者：
Li, Xianfeng
中科院分区：
文献类型：
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作者：
Chen, Dongju;Chen, Xiaoli;Li, Xianfeng
设计并制备了一种用于钒液流电池(VFB)的高性能酸碱混合离子交换膜。通过将H+-SPEK转移到Na+-SPEK上，改善了亲水性磺化聚醚醚酮(SPEK)与聚苯并咪唑(PBI)的相容性。基于酸碱相互作用形成的内部交联网络，实现了基于SPEK和PBI的混合离子交换膜的离子选择性和质子导电性之间的极大平衡。在电流密度为80 mA cm(-2)时，VFB的库仑效率为98.5%，能量效率为89.8%，是迄今报道的离子交换膜的最高值之一。此外，SPEK-PBI共混膜还具有优异的化学稳定性、机械稳定性和热稳定性，在真空循环床上具有很好的应用前景。
A high-performance acid-base blend ion exchange membrane is designed and prepared for vanadium flow battery (VFB) application. Through transferring H+-SPEEK to Na+-SPEEK, the compatibility of hydrophilic sulfonated poly(ether ether ketone) (SPEEK) and polybenzimidazole (PBI) is improved. A great balance between ion selectivity and proton conductivity for these blend ion exchange membranes based on SPEEK and PBI is realized, due to the internal cross-linked networks induced by the acid-base interaction. A very impressive VFB performance with a coulombic efficiency of 98.5% and an energy efficiency of 89.8% at a current density of 80 mA cm(-2) is thus obtained, which are among the highest values ever reported for ion exchange membranes. Besides, these SPEEK-PBI blend membranes also possess excellent chemical, mechanical and thermal stability, showing very promising prospect for VFB application.