A Low-Cost and High-Performance Sulfonated Polyimide Proton-Conductive Membrane for Vanadium Redox Flow/Static Batteries
Citations Over TimeTop 10% of 2017 papers
Abstract
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.
Related Papers
- → Vanadium Electrolyte Studies for the Vanadium Redox Battery—A Review(2016)506 cited
- → A comparative study of iron-vanadium and all-vanadium flow battery for large scale energy storage(2021)95 cited
- → RETRACTED ARTICLE: Capacity balancing for vanadium redox flow batteries through electrolyte overflow(2018)26 cited
- → Application of flexible integrated microsensor to internal real-time measurement of vanadium redox flow battery(2017)12 cited
- → Effect of Electrolyte Concentration on Performance in Vanadium Redox Flow Battery(2016)