Membrane Considerations for the All-Iron Hybrid Flow Battery

Sinclair, Nicholas S.; Vasil, Matthew; Kallamis, Christian; Nagelli, Enoch A.; Wainright, Jesse S.; Savinell, Robert F.; Wnek, Gary E.

doi:10.1149/1945-7111/acced2

“…In a RFB, the positive and negative electrolytes undergo redox reactions, transforming and storing electrical energy into chemical energy during charge, and releasing it during discharge [3] . Among other chemistries, iron-based flow batteries represent several advantages such as the abundance, low cost, and safety of iron-based materials [4][5][6][7] . Recently, Jiang et al have developed an iron-lead (Fe-Pb) single-flow battery using Pb/PbSO 4 and Fe 2+ /Fe 3+ as the redox couples for the anode and cathode, respectively [8] .…”

Section: Introductionmentioning

confidence: 99%

Tailoring porous structure in non-ionic polymer membranes using multiple templates for low-cost iron-lead single-flow batteries

Zhang,

Lejarazu-Larrañaga,

Yang

et al. 2024

Energy Mater

2

0

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Porous ion-selective membranes are promising alternatives for the expensive perfluorosulfonic acid membranes in redox flow batteries. In this work, novel non-ionic porous polyvinylidene fluoride-hexafluoro propylene membranes are designed for iron-lead single-flow batteries. The membranes are prepared using a multiple template approach, involving simultaneously using polyethylene glycol and dibutyl phthalate (DBP) as pore-forming templates. Their porous structure is finely tuned by adjusting the ratio of the two templates. As a result, dual-porous membranes bearing both macro and micropores are obtained. The H3520 membrane with modified porous structure attains a high proton conductivity of 43.5 mS·cm-1 and a relatively low ferric ion diffusion constant (8.61 × 10-8 cm2·min-1) and demonstrates the best balance between these performance-determining parameters (selectivity 5.04 × 105 S·min·cm-3, higher than that of the N115 membrane). Besides, performance tests of the iron-lead single-flow single cells equipped with the dual-porous membranes show a high energy efficiency, exceeding 87.2% at its rated current density, and outstanding cycling stability over 200 charge-discharge cycles. Altogether, the mixed template method presents a promising strategy to prepare high-performance and low-cost non-ionic membranes for redox flow batteries.

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High‐Stable All‐Iron Redox Flow Battery with Innovative Anolyte based on Steric Hindrance Regulation

Yang,

Wei,

Zhou

et al. 2024

Angewandte Chemie

0

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All‐soluble all‐iron redox flow batteries (AIRFBs) are an innovative energy storage technology that offer significant financial benefits. Stable and affordable redox‐active materials are essential for the commercialization of AIRFBs, yet the battery stability must be significantly improved to achieve practical value. Herein, ferrous complexes combined with the triisopropanolamine (TIPA) ligand are identified as promising anolytes to extend battery life by reducing cross‐contamination due to a pronounced steric hindrance effect. The coordination structure and failure mechanism of our Fe‐TIPA complexes were determined by molecular dynamics simulation and spectroscopic experiments. By coupling with [Fe(CN)6]4 −/3− , Fe‐TIPA/Fe‐CN AIRFBs retained excellent stability exceeding 1831 cycles at 80 mA·cm −2 , yielding an energy efficiency of ~80% and maintaining a steady discharge capacity. Moreover, the all‐soluble electrolyte was tested in an industrial‐scale Fe‐TIPA/Fe‐CN AIRFB prototype energy storage system, where an energy efficiency of 81.3% was attained. Given the abundance of iron resources, we model the TIPA AIRFB electrolyte cost to be as low as 32.37 $/kWh, which is significantly cheaper than the current commercial level. This work demonstrates that steric hindrance is an effective measure to extended battery life, facilitating the commercial development of affordable flow batteries.

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High‐Stable All‐Iron Redox Flow Battery with Innovative Anolyte based on Steric Hindrance Regulation

Yang,

Wei,

Zhou

et al. 2024

Angew Chem Int Ed

0

View full text Add to dashboard Cite

All‐soluble all‐iron redox flow batteries (AIRFBs) are an innovative energy storage technology that offer significant financial benefits. Stable and affordable redox‐active materials are essential for the commercialization of AIRFBs, yet the battery stability must be significantly improved to achieve practical value. Herein, ferrous complexes combined with the triisopropanolamine (TIPA) ligand are identified as promising anolytes to extend battery life by reducing cross‐contamination due to a pronounced steric hindrance effect. The coordination structure and failure mechanism of our Fe‐TIPA complexes were determined by molecular dynamics simulation and spectroscopic experiments. By coupling with [Fe(CN)6]4 −/3− , Fe‐TIPA/Fe‐CN AIRFBs retained excellent stability exceeding 1831 cycles at 80 mA·cm −2 , yielding an energy efficiency of ~80% and maintaining a steady discharge capacity. Moreover, the all‐soluble electrolyte was tested in an industrial‐scale Fe‐TIPA/Fe‐CN AIRFB prototype energy storage system, where an energy efficiency of 81.3% was attained. Given the abundance of iron resources, we model the TIPA AIRFB electrolyte cost to be as low as 32.37 $/kWh, which is significantly cheaper than the current commercial level. This work demonstrates that steric hindrance is an effective measure to extended battery life, facilitating the commercial development of affordable flow batteries.

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Membrane Considerations for the All-Iron Hybrid Flow Battery

Cited by 7 publications

References 31 publications

Tailoring porous structure in non-ionic polymer membranes using multiple templates for low-cost iron-lead single-flow batteries

Tailoring porous structure in non-ionic polymer membranes using multiple templates for low-cost iron-lead single-flow batteries

High‐Stable All‐Iron Redox Flow Battery with Innovative Anolyte based on Steric Hindrance Regulation

High‐Stable All‐Iron Redox Flow Battery with Innovative Anolyte based on Steric Hindrance Regulation

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