Improvement of proton conductivity and efficiency of SPEEK-based composite membrane influenced by dual-sulfonated flexible comb-like polymers for vanadium flow battery

Jiang, Shuai; Wang, Haixia; Li, Lang; Zhao, Caiyuan; Sheng, Jiaxuan; Shi, Haifeng

doi:10.1016/j.memsci.2023.121394

Cited by 20 publications

(15 citation statements)

References 74 publications

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“…This result is consistent with the values reported in the literature. 55,56 Notably, the migration of water and vanadium ions across the membrane cannot be avoided, and the negative electrolyte is easily oxidized by the air in the actual application of VFBs. 57,58 When the sealing of the pipeline system (including electrolyte storage tanks) is poor, the oxidation of some V 2+ will lead to an imbalance of the positive and negative electrolytes, which will cause the capacity decay of the battery.…”

Section: Resultsmentioning

confidence: 99%

Efficient and durable vanadium flow batteries enabled by high-performance fluorinated poly(aryl piperidinium) membranes

Ban,

Guo,

Wang

et al. 2023

J. Mater. Chem. A

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Section: Resultsmentioning

confidence: 99%

Efficient and durable vanadium flow batteries enabled by high-performance fluorinated poly(aryl piperidinium) membranes

Ban,

Guo,

Wang

et al. 2023

J. Mater. Chem. A

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“…The efficient performance of VFBs is detected with a constant current density at the range of 30–300 mA cm –2 , and the cutoff voltages are set at 0.8 and 1.65 V, respectively, to avoid the corrosion of carbon felts and graphite polar plates. The coulombic efficiency (CE), voltage efficiency (VE), and energy efficiency (EE) are obtained through eqs –, respectively. , CE = Q dis Q cha × 100 % VE = V dis V cha × 100 % EE = CE × VE where Q dis and Q cha represent the discharge and charge capacity, respectively. V cha and V dis are the charge and discharge voltage, respectively.…”

Section: Fundamentals Of the Vfbmentioning

confidence: 99%

“…The coulombic efficiency (CE), voltage efficiency (VE), and energy efficiency (EE) are obtained through eqs 1−3, respectively. 58,59 = × Q Q CE 100% dis cha…”

Section: Fundamentals Of the Vfbmentioning

confidence: 99%

Review and Perspectives of Sulfonated Poly(ether ether ketone) Proton Exchange Membrane for Vanadium Flow Batteries

Qian,

Zhou,

Zhang

et al. 2023

Energy Fuels

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The vanadium flow battery (VFB) has been implemented as an alternative energy storage technology for wind and solar energy systems due to its advantages of high energy conversion efficiency, facile design and fabrication, extended battery lifespan, high power, and low cost. The proton exchange membrane (PEM), as one of the key VFB components, is critical in determining the application value and practical efficiency of battery systems. Among various PEMs, sulfonated poly(ether ether ketone) (SPEEK) membranes have received widespread attention due to their simple structure, facile preparation, superior thermal and mechanical stability, low cost, and easy modification. However, their large-scale application is still plagued, where membrane performance heavily depends upon the sulfonation degree and the higher sulfonation leads to worse ion permeation and an excessive swelling behavior, decreasing the membrane stability and battery performance. Therefore, structural regulation, functionalization modification, and filler enhancement strategies of SPEEK have been applied to improve its comprehensive performance. Here, the fundamental research and practical development status of SPEEK in the VFB are comprehensively reviewed, including recent advances in various modification strategies. Potential interactions among the structure−activity relationship, modification methods, and chemical stability protection of the SPEEK membrane are established. Finally, the challenges and potential future research directions for the development of SPEEK membranes are critically appraised.

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“…The relatively low conductivity of nonperfluorinated membranes is mainly due to their rigid and hydrophobic segments, which prevents the formation of continual ion-transport channels. Up to now, many strategies have been proposed to solve these issues, mainly including introducing functional materials, increasing the ion exchange capacity, improving the channel interconnectivity, and so on. − Recently, Liu et al introduced modified Zr-MOFs into a sulfonated poly(ether ether ketone) (SPEEK) matrix to reconstruct proton channels in the membrane . The fabricated hybrid membrane had two types of proton channels: one was the internal proton channel in IM-UIO-66-AS and the other was the interfacial proton channel between Zr-MOFs and SPEEK.…”

Section: Introductionmentioning

confidence: 99%

A sub-10 μm Ion Conducting Membrane with an Ultralow Area Resistance for a High-Power Density Vanadium Flow Battery

Shi

Lü

2023

ACS Appl. Energy Mater.

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With the outstanding features of high safety, high efficiency, and long lifespan, the vanadium flow battery (VFB) is well-suited for large-scale energy storage; however, it suffers from low power density. The high ion conductivity of membranes is very important to increase the performance of VFBs at high current densities and improve their power density. Here, we show a highly conductive free-standing sub-10 μm polybenzimidazole (PBI) membrane. The decrease in the membrane thickness contributes to shorter ion-transport pathways and lower resistance. The relatively loose cross-linked structure of the thin membrane provides sufficient free volume for ion transport. According to these results, the membrane exhibits an ultralow area resistance of 0.04 Ω cm2, much lower than that of commercial Nafion 115 membrane (0.20 Ω cm2), making the ion conductivity superior. Additionally, the sub-10 μm PBI membrane also shows a very high tensile strength of 45.5 MPa and high ion selectivity. The VFB assembled with a sub-10 μm PBI membrane delivers a high energy efficiency of approximately 80% at a high current density of 200 mA cm–2 and can run stably for more than 500 cycles without obvious performance decay. The increased performance of the VFB at a very high current density of 200 mA cm–2 contributes to its higher power density. Therefore, it is an available way to adopt free-standing sub-10 μm PBI membranes with high conductivity, selectivity, and mechanical stability to improve the power density of VFBs. Similarly, the application of it will also accelerate the practical application of VFB energy storage technology.

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Improvement of proton conductivity and efficiency of SPEEK-based composite membrane influenced by dual-sulfonated flexible comb-like polymers for vanadium flow battery

Cited by 20 publications

References 74 publications

Efficient and durable vanadium flow batteries enabled by high-performance fluorinated poly(aryl piperidinium) membranes

Efficient and durable vanadium flow batteries enabled by high-performance fluorinated poly(aryl piperidinium) membranes

Review and Perspectives of Sulfonated Poly(ether ether ketone) Proton Exchange Membrane for Vanadium Flow Batteries

A sub-10 μm Ion Conducting Membrane with an Ultralow Area Resistance for a High-Power Density Vanadium Flow Battery

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