Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 642, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2021.119985
Keywords
Vanadium flow battery; Adamantane; Anion exchange membrane; Selective swelling; Poly (aryl ether)
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Funding
- Natural Science Foundation of China [21444006, 21706164]
- State Key Laboratory of Fine Chemicals [KF1710]
- Liaoning ProvincialEducation Department [LJ2019005]
- Liaoning Provincial Science and Technology Department [2019-MS-261]
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This study successfully prepared new QPAPEKK membranes with selective swelling-induced ion transport channels, reducing membrane area resistance and improving battery performance. These membranes have promising applications for high-power density VRFBs due to their high battery performance and chemical stability.
Anion exchange membranes with attractive advantages are highly promising for vanadium flow battery (VRFB) applications, but high area resistance limits their uses in high-power-density VRFB. Increasing the ion exchange capacity (IEC) is long considered as the primary choice to enhance the membrane conductivity, which unfortunately results in highly swelling and much sacrifice of the membrane selectivity and stability. In this work, new quaternized phenyl and adamantane containing poly(aryl ether ketone ketone) (QPAPEKK) membranes with selective swelling-induced ion transport channels are prepared. QPAPEKK membranes with much low IEC (0.62 mmol g(-1)) are selective swelled with H3PO4 to form ion transport channels. Consequently, the area resistance of resulting QPAPEKK-110 membrane (0.24 O cm(2)) is nearly one-fifth of QPAEKK-virgin membrane (1.21 O cm2). Moreover, VRFB utilizing QPAPEKK-90 membrane exhibit impressive battery performance (energy efficiency 91.4% at 80 mAcm(-2); energy efficiency 80.0% at 220 mAcm(-2)). The QPAPEKK membranes combined high battery performance and high chemical stability are promising for high-power density VRFB application.
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