Journal
JOURNAL OF POWER SOURCES
Volume 477, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.229011
Keywords
Anion exchange membrane; Pyridine; Adamantane; Poly (aryl ether ketone); Vanadium redox flow battery
Funding
- Natural Science Foundation of China [21444006, 21706164]
- State Key Laboratory of Fine Chemicals [KF1710]
- Liaoning Provincial Education Department [LJ2019005]
- Liaoning Provincial Science and Technology Department [2019-MS-261]
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High-performance membranes are crucial components for high power density, durable vanadium redox flow battery (VRFB). Many cost-effective membranes with high conductivity and good ion selectivity have been developed, but most of these membranes have inadequate stability. To rectify this situation, a new pyridinium functionalized, 2-adamantane containing poly (aryl ether ketone) (Py2-ADMPEK) membranes with high battery performance and excellent stability are developed. Positively charged pyridinium groups are introduced into the rigid, hydrophobic and low swelling adamantane containing backbone. Consequently, the resulting Py2-ADMPEK membrane with a high ion exchange capacity of 2.59 mmol g(-1) exhibits water swelling of only 14.5% and low area resistance (0.17 Omega cm(2)) close to that of Nafion 212 membrane (0.13 Omega cm(2))). Furthermore, the Py2-ADMPEK membranes benefit from their limited swelling and the Donnan effect, that produce good selectivity and excellent stability. A VRFB containing a Py2-ADMPEK membrane exhibit very promising battery performance (coulombic efficiency of 98.3%, voltage efficiency of 89.7% and energy efficiency of 88.2% at 80 mA cm(-2)). Moreover, the Py2-ADMPEK membrane exhibit stable battery performance (more than 2000 cycles at 120 mA cm(-2)) and excellent chemical stability.
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