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Non-aqueous redox flow batteries (NARFBs) are promising in the grid-scale energy storage for the harvesting of the intermittent renewable power sources. However, the lack of efficient separator is still impeding their further development. A flexible nanoporous separator is prepared through a “rolling dough” strategy, with zinc metal-organic framework (MOF-5) and polytetrafluoroethylene as the substrate. The prepared separator shows a remarkable ionic selectivity of Li+ over N-(ferrocenylmethyl)-N,N-dimethyl-N-ethylammonium ions (Fc1N112+) at a high ratio 26.6. A Li-based hybrid NARFB constructed with the separator exhibits substantially high Coulombic efficiency 99.7% and average discharge capacity 2.26 Ah L−1 with capacity retention 99.96% per cycle over 200 cycles at 4 mA cm−2. The excellent performance is attributed to the MOF nanoparticles and the designed composite structure, which achieves both high ionic selectivity and chemical stability simultaneously. This work provides a facile and efficient strategy to fabricate high-performance separator for NARFBs.
- Energy storage
- Metal-organic frameworks
- Redox flow battery
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- 1 Finished
01/09/2019 → 31/10/2020
Project: Academy of Finland: Other research funding