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Chu J, Liu Q, Ji W, Li J, Ma X. Novel microporous sulfonated polyimide membranes with high energy efficiency under low ion exchange capacity for all vanadium flow battery. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2023.142080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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Zhang B, Fu Y, Liu Q, Li L, Zhang X, Yang Z, Zhang E, Wang K, Wang G, Zhang Z, Zhang S. Swelling-Induced Quaternized Anthrone-Containing Poly(aryl ether ketone) Membranes with Low Area Resistance and High Ion Selectivity for Vanadium Flow Batteries. ACS APPLIED MATERIALS & INTERFACES 2022; 14:50858-50869. [PMID: 36331393 DOI: 10.1021/acsami.2c14107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
A vanadium flow battery (VFB) is one of the most promising electrochemical energy storage technologies. However, membranes for VFBs still suffer from high cost or low conductivity and poor stability. Here, we report new quaternized anthrone-containing poly(aryl ether ketone) (QAnPEK) membranes for VFBs. QAnPEK membranes with moderate ion exchange capacity (1.26 mmol g-1) were swelling-induced in H3PO4 (50 wt %) to form wider ion transport pathways that significantly enhanced membrane conductivity (e.g., 0.49 Ω cm2 for the QAnPEK-virgin membrane and 0.12 Ω cm2 for the swelling-induced QAnPEK-90 membrane). The bulky rigid anthrone-containing backbone provided high swelling resistance and enabled QAnPEK membranes to have high ion selectivity. As a result, QAnPEK membranes displayed low area resistance, high ion selectivity, and robust mechanical strength. The QAnPEK-90 membrane yielded excellent energy efficiencies (92.4% at 80 mA cm-2, 85.1% at 200 mA cm-2, and 80.3% at 280 mA cm-2). Moreover, QAnPEK membranes exhibited outstanding in situ and ex situ stability, for example, the VFB with the QAnPEK-40 membrane demonstrated highly stable battery performance for 3000 cycles at 160 mA cm-2. QAnPEK membranes are attractive candidates for VFB application.
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Affiliation(s)
- Bengui Zhang
- College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang110142, China
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian116024, China
| | - Yanshi Fu
- College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang110142, China
| | - Qian Liu
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian116024, China
| | - Lu Li
- College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang110142, China
| | - Xueting Zhang
- College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang110142, China
| | - Zhirong Yang
- College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang110142, China
| | - Enlei Zhang
- College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang110142, China
| | - Kangjun Wang
- College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang110142, China
| | - Guosheng Wang
- College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang110142, China
| | - Zhigang Zhang
- College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang110142, China
| | - Shouhai Zhang
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian116024, China
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Robust Adamantane-Based Membranes with Enhanced Conductivity for Vanadium Flow Battery Application. Polymers (Basel) 2022; 14:polym14081552. [PMID: 35458299 PMCID: PMC9029318 DOI: 10.3390/polym14081552] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 03/31/2022] [Accepted: 04/08/2022] [Indexed: 02/05/2023] Open
Abstract
Membranes with high conductivity, high selectivity, and high stability are urgently needed for high-power-density vanadium flow batteries (VFBs). Enhancing membrane conductivity presents many challenges, often resulting in sacrificing membrane selectivity and mechanical strength. To overcome this, new robust adamantane-based membranes with enhanced conductivity are constructed for VFB. Low-content basic piperazine (IEC = 0.78 mmol g−1) and hydrophilic hydroxyl groups are introduced into highly rigid, hydrophobic adamantane containing poly(aryl ether ketone) backbone (PAPEK) and then selectively swelled to induce microphase separation and form ion transport pathways. The highly rigid and hydrophobic PAPEK exhibits high swelling resistance and provides the membranes with slight swelling, high selectivity, and high mechanical strength. The selective swelling temperature has a significant influence on the areal resistance of the resulting membrane, e.g., the PAPEK-130 membrane, when selectively swelled at 130 °C, has low areal resistance (0.22 Ω∙cm2), which is approximately two-fifths that of the PAEKK-60 membrane (treated at 60 °C, 0.57 Ω∙cm2). Consequently, the resulting PAPEK membranes exhibit low swelling, high selectivity, and low areal resistance, with the VFB constructed with a PAPEK-90 membrane exhibiting excellent energy efficiency (91.7%, at 80 mA∙cm−2, and 80.0% at 240 mA∙cm−2) and stable cycling performance for 2000 cycles.
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