Pore-filled anion-exchange membranes for non-aqueous redox flow batteries with dual-metal-complex redox shuttles

Kim, Do-Hyeong; Seo, Seok-Jun; Lee, Myung-Jin; Park, Jin-Soo; Moon, Seung‐Hyeon; Kang, Yong Soo; Choi, Young‐Woo; Kang, Moon‐Sung

doi:10.1016/j.memsci.2013.11.051

Cited by 49 publications

(25 citation statements)

References 28 publications

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“…Among all surveyed works, (PDDA/PSS) 5 on ANF exhibited the lowest permeability and CIE/cycle time degradation rate, representing a breakthrough in NAqRFB separator and membrane design. It should be noted that while most of the work represented in the figure utilized V(acac) 3 in ACN as the model active species, Kim et al 26 used tris(2,2′-bipyridyl) complexes of iron and nickel in propylene carbonate as the active species. Despite this major difference in cell chemistry and solvent, the permeability and CIE/cycle time data correlated well with the other data points and illustrates that permeability-CIE/cycle time relationship stands regardless of the cell chemistry used.…”

Section: Discussionmentioning

confidence: 99%

“…Vanadium acetylacetonate was used as the active species in all cases with the exception of ref. [ 26 ] with pore-filled membrane, which used metal bipyridine …”

Section: Discussionmentioning

confidence: 99%

“…Only a few IEMs have been developed specifically for NAqRFBs. Kim et al 26 . described the fabrication of a composite material consisting of a porous polyolefin separator infiltrated with a quaternized poly(styrene-divinylbenzene-vinylbenzyl chloride) copolymer.…”

Section: Introductionmentioning

confidence: 99%

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Nanoporous aramid nanofibre separators for nonaqueous redox flow batteries

et al. 2018

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Redox flow batteries are attractive for large-scale energy storage due to a combination of high theoretical efficiencies and decoupled power and energy storage capacities. Efforts to significantly increase energy densities by using nonaqueous electrolytes have been impeded by separators with low selectivities. Here, we report nanoporous separators based on aramid nanofibres, which are assembled using a scalable, low cost, spin-assisted layer-by-layer technique. The multilayer structure yields 5 ± 0.5 nm pores, enabling nanofiltration with high selectivity. Further, surface modifications using polyelectrolytes result in enhanced performance. In vanadium acetylacetonate/acetonitrile-based electrolytes, the coated separator exhibits permeabilities an order of magnitude lower and ionic conductivities five times higher than those of a commercial separator. In addition, the coated separators exhibit exceptional stability, showing minimal degradation after more than 100 h of cycling. The low permeability translates into high coulombic efficiency in flow cell charge/discharge experiments performed at cycle times relevant for large-scale applications (5 h).

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Section: Discussionmentioning

confidence: 99%

“…Vanadium acetylacetonate was used as the active species in all cases with the exception of ref. [ 26 ] with pore-filled membrane, which used metal bipyridine …”

Section: Discussionmentioning

confidence: 99%

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Nanoporous aramid nanofibre separators for nonaqueous redox flow batteries

et al. 2018

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“…The concept of pore-filled membranes. 22) and the phase angle of impedance (θ) of a membrane were measured and converted into MER (Ω ·cm 2 ) value using the following equation: 24,25) (1)…”

Section: Membrane Characterizationsmentioning

confidence: 99%

Development of Pore-filled Ion-exchange Membranes for Efficient All Vanadium Redox Flow Batteries

Kang¹

2013

Journal of the Korean Electrochemical Society

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: Thin pore-filled cation and anion-exchange membranes (PFCEM and PFAEMs, t m = 25-30 µm) were prepared using a porous polymeric substrate for efficient all-vanadium redox flow battery (VRB). The electrochemical and charge-discharge performances of the membranes have been systematically investigated and compared with those of commercially available ion-exchange membranes. The pore-filled membranes were shown to have higher permselectivity as well as lower electrical resistances than those of the commercial membranes. In addition, the VRBs employing the pore-filled membranes exhibited the respectable chargedischarge performances, showing the energy efficiencies (EE) of 82.4% and 84.9% for the PFCEM and PFAEM, respectively (cf. EE = 87.2% for Nafion 1135). The results demonstrated that the pore-filled ion-exchange membranes could be successfully used in VRBs as an efficient separator by replacing expensive Nafion membrane.

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“…11 In addition to crosslinking, a pore-filled polyvinyl chloride (PVC) AEM exhibited high ion conductivity and V(III)(acetylacetonate) 3 (V(acac) 3 ) selectivity during charging/discharging. 12 The polymeric membranes of Nafion 115 and inorganic material, SiO 2 customized Nafion 115, 4 were examined and the SiO 2 -introduced Nafion115 showed reduced crossover of V(acac) 3 by 2.5 to 0.14 × 10 −3 cm 2 min −1 compared to the pure Nafion 115 membrane with compromised conductivity. The organic and inorganic composite-based framework prepared by the semi interpenetrating polymer network (SIPN) showed a highly porous structure that enabled the prepared membrane to operate under high current densities (3 mA cm −2 ) with an energy efficiency of 82%.…”

mentioning

confidence: 99%

Na-β-Alumina as a Separator in the Development of All-Vanadium Non-Aqueous Tubular Redox Flow Batteries: An Electrochemical and Charging-Discharging Examination Using a Prototype Tubular Redox Flow Cell

Muthuraman

Boyeol

Moon

2018

J. Electrochem. Soc.

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The non-aqueous redox flow battery (N-ARFB) is in the development stages with aim to produce high power density storage systems. In addition to the development of N-ARFBs, this study examined the applicability of a sodium beta alumina (Na-β-Al 2 O 3 ) membrane in the development of a N-ARFB through an analysis of the electrochemical processes, redox active species migration, and charging/discharging at room temperature (25 ± 3 • C). Through impedance analysis, the ionic conductivity of the Na-β-Al 2 O 3 was 2.97 × 10 −2 S cm −1 which is slightly higher than the literature value. UV-Visible analysis showed no migration of the vanadium acetylacetonate (V(acac) 3 ) ion from one compartment to another, either during the charging or discharging process. In addition, the lack of a change in the morphology of the spent membrane revealed not only stability, but also confirmed no permeation of V(acac) 3 species. The maximum applied current density for charging and discharging was 0.01 mA cm −2 and 0.0015 mA cm −2 , respectively. The charging/discharging of V(acac) 3 enables voltage and current efficiencies of almost 16% and 11% respectively, at the state of charge of 15%. This demonstrates that the Na-β-Al 2 O 3 membrane can be improved for use in N-ARFB after optimizing the conditions. © The Author The non-aqueous redox flow battery (N-ARFB) is in the development stages with the strong potential for high power density (>2 V) N-ARFB that can store energy from non-conventional sources, such as wind mills and solar power. 1 Although the development of N-ARFBs has attracted considerable interest, such as redox active species selection, 2 electrolyte development, 2,3 and solvent selection, 4 the identification of a suitable membrane is one of the crucial factors because of the crossover of redox active species. [4][5][6] The oxidation state of most redox active metal organic complexes (RAMOCs) is negative, which means that there is theoretically less migration on membranes with the same polarity but the transport of oppositely charged negative ions is allowed. Using this approach, many anionic selective polymeric membranes (AEM) were developed and made commercially available for N-ARFBs, such as Neosepta AHA (Astom, Japan), FAP4 (FuMaTech Co.), and AMI-7001 (Membrane International Inc., USA), which were investigated in N-ARFB systems using a conventional H-type cell. [7][8][9] On the other hand, they showed poor chemical and mechanical stability in organic electrolytes. 1 Through a zero-gap (electrodes coated on the membrane) redox flow battery prototype design, the modified Nafion 1035 membrane could be operated in all VRFB with columbic and energy efficiencies of 91% and 80%, respectively. 10 A polymeric membrane prepared by a simultaneous polymerization and quarternization method showed low vanadium permeability while retaining good dimensional and chemical stability in N-ARFB. 11 In addition to crosslinking, a pore-filled polyvinyl chloride (PVC) AEM exhibited high ion conductivity and V(III)(acetylacetonate) 3 (V(acac) ...

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Pore-filled anion-exchange membranes for non-aqueous redox flow batteries with dual-metal-complex redox shuttles

Cited by 49 publications

References 28 publications

Nanoporous aramid nanofibre separators for nonaqueous redox flow batteries

Nanoporous aramid nanofibre separators for nonaqueous redox flow batteries

Development of Pore-filled Ion-exchange Membranes for Efficient All Vanadium Redox Flow Batteries

Na-β-Alumina as a Separator in the Development of All-Vanadium Non-Aqueous Tubular Redox Flow Batteries: An Electrochemical and Charging-Discharging Examination Using a Prototype Tubular Redox Flow Cell

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