热烈祝贺李劲超博士论文被ACS applied materials & interfaces 接收！

发布时间：2020-04-25

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A Low-Cost and High-Performance Sulfonated Polyimide Proton Conductive Membrane for Vanadium Redox Flow/Static Batteries

A novel side-chain-type fluorinated sulfonated polyimide (s-FSPI) membrane is synthesized by high-temperature polycondensation and grafting reactions for vanadium redox batteries (VRBs). The s-FSPI membrane shows a vanadium ion permeability that is over an order of magnitude lower and a proton selectivity that is 6.8 times higher compared to the Nafion 115 membrane. The s-FSPI membrane possesses superior chemical stability than most of the linear sulfonated aromatic polymer membranes reported for VRBs. Besides, 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 of the commercial Nafion 115 membrane. This work opens up new possibilities for fabricating high-performance proton conductive membranes at low costs for VRBs.

http://pubs.acs.org/doi/abs/10.1021/acsami.7b07437