Poly(arylene ether sulfone) Membrane Crosslinked with Bi‐Guanidinium for Vanadium Flow Battery Applications

Qu, Chao; Zhang, Hongzhang; Wang, Changsheng; Li, Xianfeng

doi:10.1002/macp.202100338

Cited by 1 publication

(1 citation statement)

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“…Many Nafion-based composite membranes were prepared to enhance membrane selectivity. − In recent years, many works have focused on low-cost hydrocarbon-based polymer membranes to replace the much more expensive Nafion membranes. Many membranes, for example, based on poly(ether ether ketone), − polysulfone, , poly(ether sulfone), , poly(aryl ether)s, − polyimide, , ether-free polymers, , and polybenzimidazoles (PBI), − and others, were prepared for VRFB application. These studies have extensively promoted the development of vanadium redox flow batteries, and some membranes have been obtained for demonstration applications …”

Section: Introductionmentioning

confidence: 99%

Swelling-Induced Cross-Linked Pyridine-Containing Membranes with High Stability and Conductivity for Vanadium Redox Flow Batteries

Zhang

Yang

Liu

et al. 2023

ACS Sustainable Chem. Eng.

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Vanadium redox flow batteries (VRFB) have many advantages in overcoming the volatility of renewable energy. However, membranes, one of the key materials for VRFB, face crucial challenges, for example, membranes with high conductivity tend to exhibit high swelling, low selectivity, and poor mechanical stability. In this work, new cross-linked membranes (C-PyPEKK) were prepared by blending a novel chloromethylated adamantane-containing polymer (CAPEK) (with a bulky, rigid, twisted backbone) with a unique pyridine-containing polymer (PyPEKK). The synergistic effect of cross-linked structures and bulky, rigidly twisted adamantane-containing backbone gives the membrane excellent membrane swelling resistance and selectivity. C-PyPEKK membranes were selectively swelled and formed wide ion transport channels, enhancing conductivity. The resulting C-PyPEKK membranes exhibited low water uptake (<8.0%), a low swelling ratio (<13.0%) (the uncross-linked PyPEKK membrane showed a high swelling ratio of 28.6%), and high mechanical strength (about 60 MPa). The C-PyPEKK-130 membrane showed a superior conductivity of 52.83 mS cm −1 and outstanding energy efficiencies (EEs) (90.75% at 80 mA cm −2 ; 79.4% at 300 mA cm −2 ), which was superior to the Nafion212 membrane (EE = 81.87%, 80 mA cm −2 ; 75.48%, 300 mA cm −2 ). The C-PyPEKK membranes showed high cycling stability (3500 cycles) in VRFB. Moreover, the C-PyPEKK membranes were robust and showed good battery performance after being immersed in strongly acidic and oxidizing 1.5 M VO 2 + in 3 M H 2 SO 4 solutions for 9 months, showing excellent chemical stability. This work proposes a new preparation route for membranes with high conductivity, high stability, and excellent mechanical strength for potential VRFB applications from unique new membrane materials combined with cross-linked membrane structures and unique conduction enhancement strategies.

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