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首页> 外文期刊>ACS applied materials & interfaces >A Low-Cost and High-Performance Sulfonated Polyimide Proton-Conductive Membrane for Vanadium Redox Flow/Static Batteries
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A Low-Cost and High-Performance Sulfonated Polyimide Proton-Conductive Membrane for Vanadium Redox Flow/Static Batteries

机译：用于钒氧化还原流量/静电电池的低成本和高效磺化聚酰亚胺质子导电膜

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摘要

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.
机译：通过高温缩聚和嫁接反应合成一种新型侧链型氟化磺化聚酰亚胺（S-FSPI）膜（VRB）。 S-FSPI膜具有钒离子渗透率，其幅度下降，与Nafion 115膜相比，质子选择性比较高的6.8倍。与大多数用于VRB的线性磺化芳族聚合物膜相比，S-FSPI膜具有优异的化学稳定性。此外，用S-FSPI膜组装的钒氧化还原流量/静电电池（VRFB / VRSB）分别在100和300次充电放电循环试验中表现出稳定的电池性能，电池效率明显更高，自放电率较低比那些含有Nafion 115膜的膜。 S-FSPI膜的优异物理化学性质和VRB性能可归因于具有疏水性三氟甲基的具体设计的分子结构和在膜的主链上引入柔性磺烷基侧链。此外，S-FSPI膜的成本仅为商业保险Nafion 115膜的成本。这项工作开辟了以低成本制造高性能质子导电膜的新可能性。

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