Preparation of covalently cross-linked sulfonated polybenzimidazole membranes for vanadium redox flow battery applications

Xia, Zijun; Ying, Libin; Fang, Jianhua; Du, Yuyu; Zhang, Weiming; Guo, Xin; Yin, Jie

doi:10.1016/j.memsci.2016.10.050

Cited by 94 publications

(26 citation statements)

References 53 publications

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“…The VE of VRFBs with both Fb‐SPI‐10 and Nafion 117 membranes increases with decreasing current density (as shown in Figure a). This result is owing to more serious polarization at higher current density . And the VE of the VRFB with Fb‐SPI‐10 membrane is superior to that of VRFB with Nafion 117 membrane at low current density.…”

Section: Resultsmentioning

confidence: 97%

Fluorine‐Containing Branched Sulfonated Polyimide Membrane for Vanadium Redox Flow Battery Applications

et al. 2018

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A series of fluorine‐containing branched sulfonated polyimide (Fb‐SPI) membranes with different degrees of branching (0–12 %) were synthesized through polycondensation. The chemical structure of Fb‐SPI‐10 membrane was confirmed using ATR‐FTIR and 1H NMR spectroscopy. The physico‐chemical properties of Fb‐SPI membranes were systematically investigated and compared to linear SPI (l‐SPI) and Nafion 117 membranes. The vanadium‐ion permeabilities of Fb‐SPI membranes (2.45–0.99×10−7 cm2 min−1) are much lower than that of Nafion 117 (17.1×10−7 cm2 min−1) membranes. Besides, the chemical stability of Fb‐SPI membranes is superior to that of l‐SPI membranes. During 500‐time continuous cyclic charge‐discharge measurements, the VRFB assembled with a Fb‐SPI‐10 membrane shows higher coulombic efficiency (98.4–99.7 %), higher or close energy efficiency (69.0–79.7 %) from 40 to 80 mA cm−2, and higher or close capacity retention (52.8–100 %) from 40 to 70 mA cm−2 compared with a device using a Nafion 117 membrane. All of these results demonstrate that the as‐selected Fb‐SPI‐10 membrane has promising potential for VRFB applications.

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Section: Resultsmentioning

confidence: 97%

Fluorine‐Containing Branched Sulfonated Polyimide Membrane for Vanadium Redox Flow Battery Applications

et al. 2018

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“…For instance, various sulfonated PBI with covalently crosslinks were synthesized for VRFBs. The optimum membrane exhibited a much lower VO 2 + permeability (4.60 × 10 −10 cm 2 min −1 vs 4.23 × 10 −6 cm 2 min −1 of Nafion 117) and higher H + /V n + selectivity (≈30 times higher than that of Nafion 117) than Nafion 117 . This is due to the combination of Donnan exclusion effect and the covalent crosslinking structure.…”

Section: Cation Exchange Membranes (Cems) For Vrfbsmentioning

confidence: 94%

“…When the crosslinkable groups were introduced into the backbone of high sulfonated SPEEK, [47] the chemical and mechanical stabilities of membranes were strengthened. [49] This is due to the combination of Donnan exclusion effect and the covalent crosslinking structure. The modified membrane remained stable after 900 h chargedischarge test.…”

Section: Design and Optimization Of Chemical Structuresmentioning

confidence: 99%

The Structure–Activity Relationship in Membranes for Vanadium Redox Flow Batteries

Jiang

Xiang

et al. 2019

Advanced Sustainable Systems

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IntroductionWith the rapid increase of consumption of fossil fuels and the consequent environment pollution, there is an urgent need for the development and effective utilization of renewable energy sources like wind, solar, biomass, etc. However, these renewable energy sources are intermittent in nature, leading to the conflict between the seasonal and unstable electricity generation and requirement of the continuous and stable power supply for the end application. Thereby, energy storage Vanadium redox flow batteries (VRFBs) are regarded as one of the most promising electrochemical technologies for grid-connected renewable energy storage systems. The performance of VRFBs, however, strongly depends on the membrane, one of the key components of VRFBs with critical dual functions of promotion of diffusion of active species (H + , H 3 O + , SO 4 2−, or SO 4 H − ) and inhibition of crossover of vanadium ions. This is intrinsically related to the microstructure of membranes. For example, large and connected ionic clusters or pores in membranes are favorable for the ion transfer, but detrimental to the ion selectivity. While small and isolated hydrophilic ion clusters or pores suppress the water uptake and ion transfer, the decreased swelling ratio would enhance chemical stability of membrane. Thus, comprehensive strategies are required to realize the optimal balance between the ion selectivity, proton conductivity, and chemical stability. This review focuses on the effects of microstructure of membranes on the ion transfer and the chemical stability, including introduction of the rigid groups, electron-withdrawing groups, and hydrophobic backbones, are reviewed. The prospect of the development of membranes with high ion selectivity and high-performance VRFBs is discussed.

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“…SPEEK was prepared following a literature reported procedure [27] . Typically, 4 g PEEK was added into 80 mL H 2 SO 4 (98%) at room temperature, and the mixture was stirred for 96 h. Then, the solution was transferred slowly into ice-cold water under mechanical agitation for 4 h. The resultant precipitate was washed thoroughly with deionized water until the pH value of washing water approached to 7.…”

Section: Synthesismentioning

confidence: 99%

“…The problem with this approach lies in that the cross-links constructed by the use of quaternized polymers will occupy sulfonic acid sites of the sulfonated polymer so that the proton conductivity will decrease as the degree of ionic cross-linking increases. It is interesting that covalently cross-linking will improve the selectivity but have little effect on proton conductivity as the report [27,28] .…”

Section: Introductionmentioning

confidence: 99%

Facile fabrication of amphoteric semi-interpenetrating network membranes for vanadium flow battery applications

Gan

et al. 2018

Journal of Energy Chemistry

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Preparation of covalently cross-linked sulfonated polybenzimidazole membranes for vanadium redox flow battery applications

Cited by 94 publications

References 53 publications

Fluorine‐Containing Branched Sulfonated Polyimide Membrane for Vanadium Redox Flow Battery Applications

Fluorine‐Containing Branched Sulfonated Polyimide Membrane for Vanadium Redox Flow Battery Applications

The Structure–Activity Relationship in Membranes for Vanadium Redox Flow Batteries

Facile fabrication of amphoteric semi-interpenetrating network membranes for vanadium flow battery applications

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