High Proton Selectivity Sulfonated Polyimides Ion Exchange Membranes for Vanadium Flow Batteries

Chen, Qi; Ding, Liming; Wang, Lihua; Yang, Haijun; Yu, Xinhai

doi:10.3390/polym10121315

Cited by 14 publications

(4 citation statements)

References 47 publications

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“…However, a few researchers focus on the specific membrane for ICFBs. Given that the stability of anion exchange membranes is still a serious problem, membranes commonly used in ICFBs are cation exchange membranes learning from VFB [ 17 , 18 , 19 ] or other batteries [ 20 , 21 , 22 , 23 , 24 ], such as perfluoro sulfonic membranes like the Nafion series [ 25 ] or sulfonated polyether ether ketone (SPEEK) membranes [ 26 , 27 ]. Nafion membranes are used widely in other battery systems due to their high chemical stability and high proton conductivity.…”

Section: Introductionmentioning

confidence: 99%

A Composite Membrane with High Stability and Low Cost Specifically for Iron–Chromium Flow Battery

et al. 2022

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The iron–chromium flow battery (ICFB), the earliest flow battery, shows promise for large-scale energy storage due to its low cost and inherent safety. However, there is no specific membrane designed that meets the special requirements of ICFBs. To match the harsh operation parameters of ICFBs, we designed and fabricated a composite membrane with high mechanical, chemical, and thermal stability. In the design, a commercial porous polyethylene membrane is selected as the framework material, offering high mechanical stability and reducing the cost. Meanwhile, the Nafion resin is filled in the pores of a porous membrane, which inhibits the transfer of redox-active ions and creates the proton channels via hydrophobic/hydrophilic phase separation. As a result, the composite membrane exhibits high conductivity, selectivity, and stability, especially with almost no swelling at high operating temperatures. Thus, an ICFB with the prepared membrane exhibits a coulombic efficiency of 93.29% at the current density of 80 mA cm−2 and runs stably for over 300 cycles. This work provides an easy method to fabricate high-performance and low-cost membranes specifically for ICFBs and has the potential to promote the development of ICFBs.

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Section: Introductionmentioning

confidence: 99%

A Composite Membrane with High Stability and Low Cost Specifically for Iron–Chromium Flow Battery

et al. 2022

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“…Other membrane processes include, but are not limited to, forward osmosis (FO), pervaporation (PV), and membrane distillation (MD) [9][10][11]. Common polymers used for membrane preparation include polystyrene (PS) [12], polypropylene (PP) [13], polyethersulfone (PES) [14], polyvinylidene fluoride (PVDF) [15], polybenzimidazole (PBI) [16], polyvinyl alcohol (PVA) [17], polytetrafluoroethylene (PTFE) [18], polyethylene (PE) [19], polyamide (PA) [20], and polyimide (PI) [21]. Recently, many new types of polymers are emerging which show promising future for membrane synthesis and applications.…”

Section: Introductionmentioning

confidence: 99%

Green synthesis of polymeric membranes: Recent advances and future prospects

Jiang

Ladewig

2020

Current Opinion in Green and Sustainable Chemistry

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Polymeric membranes are widely used in gas separations, liquid separations, and other processes such as fuel cells. However, methods and processes for manufacturing these membranes are usually harmful to the environment and/or human health. Although many new materials and synthesis methods are reported every year, green synthesis only makes up a small proportion. Therefore, more efforts are necessary to raise researchers' awareness to green synthesis of membranes. One popular strategy to greenly synthesize membranes is to avoid toxic organic solvents or use water to replace organic solvents completely. However, many reported green methods could only realize green synthesis partly. The ultimate goal is to synthesize membranes in a completely eco-friendly way, where raw materials, membrane preparation, post-treatment, and other involved procedures are all "green".

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“…Poly(ethylene oxide), polyacrylamide, polyvinylpyrrolidone, polyethyleneimine, polybenzimidazole, etc. have been used as the basic polymers in the preparation of such membranes [12][13][14][15]. Types of interactions between the acidic and basic sites of polymer membranes such as ionic crosslinking and hydrogen bonds promote the control of the swelling of the membrane without a decrease in the flexibility.…”

Section: Introductionmentioning

confidence: 99%

Sodium p-Styrene Sulfonate–1-Vinylimidazole Copolymers for Acid–Base Proton-Exchange Membranes

Лебедева

Pozhidaev

Малахова

et al. 2020

Membr. Membr. Technol.

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Binary copolymers possessing thermal stability up to 290°C and suitable for the formation of ionexchange membranes have been obtained by free radical copolymerization of sodium p-styrene sulfonate and 1-vinylimidazole with subsequent conversion to the H-form. The composition and structure of the copolymers are confirmed by elemental analysis and IR and NMR spectroscopy. Multicomponent membranes based on the copolymers of sodium p-styrene sulfonate and 1-vinylimidazole have been obtained using poly(vinyl alcohol) crosslinked by oxalic acid as a film-forming agent. It is shown by scanning electron microscopy that the surface and cut of the membranes have a uniform structure. The specific electric conductivity of the membranes with different concentrations of styrene sulfonic acid (20 to 80 mol % in the copolymer) increases with an increase in the fraction of styrene sulfonic acid and is 29.5 to 52.0 mS cm −1 at 80°C. The activation energy of proton transport of the membranes is 12.5 to 15.5 kJ mol −1. The water uptake of the membranes decreases with the increase in the concentration of the basic (imidazole) component in them, which may be associated with the increase in the density of ionic crosslinking due to the acid-base interaction of the sulfo groups and pyridine nitrogen atoms of the imidazole cycle. The formation of acid-base pairs results in the formation of continuous proton transport channels in addition to the sulfonic acid channels, which is confirmed by the high values of specific electric conductivity even in the case of a decrease in the concentration of sulfostyrene in the composition of the membrane. Increasing the concentration of 1-vinylimidazole in the composition of the copolymer from 20 to 80 mol % leads to an increase in the relative elongation at break from 3 to 6%, an increase in the tensile strength at break from 4 to 7 MPa, a decrease in the Young modulus of the membranes from 127 to 102 MPa, and a decrease in the water uptake from 45 to 15.

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High Proton Selectivity Sulfonated Polyimides Ion Exchange Membranes for Vanadium Flow Batteries

Cited by 14 publications

References 47 publications

A Composite Membrane with High Stability and Low Cost Specifically for Iron–Chromium Flow Battery

A Composite Membrane with High Stability and Low Cost Specifically for Iron–Chromium Flow Battery

Green synthesis of polymeric membranes: Recent advances and future prospects

Sodium p-Styrene Sulfonate–1-Vinylimidazole Copolymers for Acid–Base Proton-Exchange Membranes

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