A Low-Cost and High-Performance Sulfonated Polyimide Proton-Conductive Membrane for Vanadium Redox Flow/Static Batteries
A Low-Cost and High-Performance Sulfonated Polyimide Proton-Conductive Membrane for Vanadium Redox Flow/Static Batteries
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DOI：
10.1021/acsami.7b07437
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发表时间：
2017-09-27
影响因子：
9.5
通讯作者：
Li, Aikui
中科院分区：
文献类型：
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作者：
Li, Jinchao;Yuan, Xiaodong;Li, Aikui
通过高温缩聚和接枝反应合成了一种新型的侧链型氟化磺化聚酰亚胺（s-FSPI）膜。s-FSPI膜的钒离子渗透性比Nafion 115膜低一个数量级以上，质子选择性比Nafion 115膜高6.8倍。s-FSPI膜具有优越的化学稳定性相比，大多数线性磺化芳香族聚合物膜报道的vrb。此外，装配了s-FSPI膜的钒氧化还原流/静态电池（VRFB/VRSB）分别在100次和300次充放电循环测试中表现出稳定的电池性能，电池效率显著高于使用Nafion 115膜的电池，自放电率显著低于使用Nafion 115膜的电池。s-FSPI膜具有优异的物理化学性能和VRB性能，这可归因于在膜主链上引入疏水三氟甲基和柔性磺烷基垂链的特殊分子结构。此外，s-FSPI膜的成本仅为商用Nafion 115膜的四分之一。这项工作为vrb以低成本制造高性能质子导电膜开辟了新的可能性。
A novel side-chain-type fluorinated sulfonated polyimide (s-FSPI) membrane is synthesized for vanadium redox batteries (VRBs) by high-temperature polycondensation and grafting reactions. The s-FSPI membrane has a vanadium ion permeability that is over an order of magnitude lower and has a proton selectivity that is 6.8 times higher compared to those of the Nafion 115 membrane. The s-FSPI membrane possesses superior chemical stability compared to most of the linear sulfonated aromatic polymer membranes reported for VRBs. Also, the vanadium redox flow/static batteries (VRFB/VRSB) assembled with the s-FSPI membranes exhibit stable battery performance over 100-and 300-time charge discharge Cycling tests, respectively, with significantly higher battery efficiencies and lower self-discharge rates than those with the Nafion 115 membranes. The excellent physicochemical properties and VRB performance of the s-FSPI membrane could be attributed to the specifically designed molecular structure with the hydrophobic trifluoromethyl groups and flexible sulfoalkyl pendants being introduced on the main chains of the membrane. Moreover, the cost of the s-FSPI membrane is only one-fourth that of the commercial Nafion 115 membrane. This work opens up new possibilities for fabricating high-performance proton-conductive membranes at low costs for VRBs.