Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 653, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2022.120517
Keywords
PIMs; SPEEK; Ion exchange membrane; Vanadium flow battery; Vanadium permeability
Categories
Funding
- National Natural Science Foundation of China [21908098, 22075076, 21908054]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) [2021YFB3802200]
- National Key Research and Development Pro-gram of China
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In this study, a polymer with intrinsic microporosity (PIM) was successfully introduced into a highly sulfonated polyether ether ketone membrane, solving the issues of poor mechanical property and low vanadium resistance. This provides a new route for the preparation of high-performance ion exchange membranes for flow batteries.
Ion exchange membranes (IEMs) blending porous materials have shown great potential for the large-scale energy storage technologies, such as flow battery. However, it remains challenging to overcome the compatibility issue between polymer and porous fillers. In this work, the polymer of intrinsic microporosity (PIM) was successfully introduced into sulfonated polyether ether ketone with high degree of sulfonation (HDS-SPEEK) membrane. PIM exhibited desirable compatibility with HDS-SPEEK due to the natural polymer property. Meanwhile, the rigid skeleton structure of PIM effectively solved the problems of HDS-SPEEK involving poor mechanical property and low vanadium resistance. With increasing the doping of carboxyl grafting modified PIM, the tensile strength increased from 15.22 to 29.94 MPa and the vanadium permeability declined from 4.4 x 10(-6 )to 1.6 x 10(-7) cm(2) min(-1). As a result, the vanadium flow battery equipped with the optimized blend membrane showed significantly enhanced coulombic efficiency from 55% to 99% at the current density of 20 mA cm(-2), and had good long-term stability. This work presents a new route to prepare high-performance IEMs based on porous PIM materials for flow battery.
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