Dual-porous structured membrane for ion-selection in vanadium flow battery

Wang, Feiran; Zhang, Zhuhan; Jiang, Fengjing

doi:10.1016/j.jpowsour.2021.230234

Cited by 14 publications

(8 citation statements)

References 47 publications

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“…6i). 15,[20][21][22][42][43][44] Besides, the selfdischarge time of the battery with the NP-Fiber membrane reaches 150 h, which is strikingly higher than that with the N212 membrane (60 h) in Fig. 6h, further demonstrating the high ion selectivity of the optimized NP-Fiber-3 membrane.…”

Section: Optimizationmentioning

confidence: 89%

A Nafion/polybenzimidazole composite membrane with consecutive proton-conducting pathways for aqueous redox flow batteries

et al. 2022

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Section: Optimizationmentioning

confidence: 89%

A Nafion/polybenzimidazole composite membrane with consecutive proton-conducting pathways for aqueous redox flow batteries

et al. 2022

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“…By removing template agents (or pore-forming agents) to create pores, ICMs with relatively regular pore structures and well-controlled pore size can be obtained (Figure e). ,,, The applied templates include solvent, polyethylene glycol (PEG), β-cyclodextrin (β-CD), phenolphthalein, SiO 2 , etc. Compared with phase inversed methods, ICMs fabricated by template methods have more uniform pore structures by adjusting the content and distributions of template agents (Figure e and e).…”

Section: Icms For Vfbsmentioning

confidence: 99%

“…Furthermore, the pore size of fabricated ICMs is somehow relatively larger, causing low selectivity (Figure e). For instance, the vanadium permeability of a ICM fabricated by a template method was 2.39 × 10 –4 cm 2 h –1 (area resistance: 4.74 Ω cm 2 ). ,,, As a result, using template methods to optimize the membrane performance is not widely studied nowadays.…”

Section: Icms For Vfbsmentioning

confidence: 99%

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Advanced Membranes Boost the Industrialization of Flow Battery

Lü

2023

Acc. Mater. Res.

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Metrics & MoreArticle Recommendations CONSPECTUS: Flow battery (FB) is nowadays one of the most suited energy storage technologies for large-scale stationary energy storage, which plays a vital role in accelerating the wide deployment of renewable energies. FBs achieve the energy conversion by reversible redox reactions of flowing active species at the positive and negative sides. An ion conducting membrane (ICM) is necessary to separate the anolyte and catholyte, while conducting chargebalanced ions to form a complete electric circuit simultaneously. However, the commonly used commercial perfluorinated sulfonated ion exchange membranes suffer from low selectivity and high cost. The widely studied nonfluorinated ion exchange membranes have poor chemical stability. Most importantly, these membranes are confronted with a trade-off between selectivity and conductivity. That has motivated researchers to explore novel membrane materials with innovative design. Among them, porous membranes based on the "ion sieving conducting" mechanism instead of the "ion exchange conducting" mechanism from traditional ion exchange membranes were put forward, upon which very impressive progress has been achieved in recent years. Different from ion exchange membranes, the porous ICMs can separate active species from charge-balanced ions by pore size exclusion. As a result, by controlling the pore structures, porous membranes can break up the selectivity and conductivity trade-off. However, the initial performance of the first reported porous ICM is not high enough to afford the industrialization of FBs. As a group striving for the integration of basic, applied and translational research, we have devoted substantial efforts to optimizing the current membrane fabrication methods, developing novel fabrication techniques, exploring novel membrane materials and increasing the membrane performance for over a decade. Based on these efforts, the preliminary industrial applications of ICMs in FBs have been realized. In this Account, we summarize and discuss the development process of ICMs in various FB systems, mainly including vanadium FBs and zinc-based FBs. We begin the discussion from the brief description of FBs and their ICMs. Then we will illustrate the "ion sieving conducting" mechanism of ICMs deeply and elaborately. This account will focus on our contributions to accelerating the industrial applications of ICMs in FB energy storage systems, upon which the modification strategies on ICMs will be illustrated thoroughly, including the regulation of formation parameters, the introduction of functional materials or functional separation layers and the implementation of post-treatment steps. We also discuss the current challenges of ICMs and propose prospects on their future development.

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“… ( a ) Comparison of cycle efficiencies of the three membranes at 200 mA cm −2 ; ( b ) discharge capacity retention of the pure PFSA, PE/PFSA composite, and Nafion212 membranes; and ( c ) EE comparison between PE/PFSA and other existing advanced membranes at different current densities [ 7 , 26 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 ]. …”

Section: Figurementioning

confidence: 99%

An Economical Composite Membrane with High Ion Selectivity for Vanadium Flow Batteries

Zhang

Luan

et al. 2023

Membranes

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The ion exchange membrane of the Nafion series widely used in vanadium flow batteries (VFBs) is characterized by its high cost and high vanadium permeability, which limit the further commercialization of VFBs. Herein, a thin composite membrane enabled by a low-cost microporous polyethylene (PE) substrate and perfluorosulfonic acid (PFSA) resin is proposed to reduce the cost of the membrane. Meanwhile, the rigid PE substrate limits the swelling of the composite membrane, which effectively reduces the penetration of vanadium ions and improves the ion selectivity of the composite membrane. Benefiting from such a rational design, a VFB assembled with the PE/PFSA composite membrane exhibited a higher coulombic efficiency (CE ≈ 96.8%) compared with commercial Nafion212 at 200 mA cm−2. Significantly, the energy efficiency maintained stability within 200 cycles with a slow decay rate. In practical terms, the thin PE/PFSA composite membrane with low cost and high ion selectivity can make an ideal membrane candidate in VFBs.

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Dual-porous structured membrane for ion-selection in vanadium flow battery

Cited by 14 publications

References 47 publications

A Nafion/polybenzimidazole composite membrane with consecutive proton-conducting pathways for aqueous redox flow batteries

A Nafion/polybenzimidazole composite membrane with consecutive proton-conducting pathways for aqueous redox flow batteries

Advanced Membranes Boost the Industrialization of Flow Battery

An Economical Composite Membrane with High Ion Selectivity for Vanadium Flow Batteries

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