Recent development of polymer membranes as separators for all-vanadium redox flow batteries

Doan, The Nam Long; Hoang, Tuan K.A.; Chen, P.

doi:10.1039/c5ra05914c

Cited by 101 publications

(69 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A few excellent reviews have been published summarizing progresses of the VRFB development. 12,13,21,25 Reviews at a component level on electrolytes, 24,26 electrodes, 27 and membranes [28][29][30] can also be found. In this journal specifically, only three reviews on the topic of VRFBs exist to date and all focus on general technology development.…”

Section: Vrfb Degradationmentioning

confidence: 99%

A review of all‐vanadium redox flow battery durability: Degradation mechanisms and mitigation strategies

et al. 2019

View full text Add to dashboard Cite

Summary The all‐vanadium redox flow battery (VRFB) is emerging as a promising technology for large‐scale energy storage systems due to its scalability and flexibility, high round‐trip efficiency, long durability, and little environmental impact. As the degradation rate of the VRFB components is relatively low, less attention has been paid in terms of VRFB durability in comparison with studies on performance improvement and cost reduction. This paper reviews publications on performance degradation mechanisms and mitigation strategies for VRFBs in an attempt to achieve a systematic understanding of VRFB durability. Durability studies of individual VRFB components, including electrolyte, membrane, electrode, and bipolar plate, are introduced. Various degradation mechanisms at both cell and component levels are examined. Following these, applicable strategies for mitigating degradation of each component are compiled. In addition, this paper summarizes various diagnostic tools to evaluate component degradation, followed by accelerated stress tests and models for aging prediction that can help reduce the duration and cost associated with real lifetime tests. Finally, future research areas on the degradation and accelerated lifetime testing for VRFBs are proposed.

show abstract

Section: Vrfb Degradationmentioning

confidence: 99%

A review of all‐vanadium redox flow battery durability: Degradation mechanisms and mitigation strategies

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Two half‐cells in a RFB are separated by a membrane, and a redox‐active species, which is stored in external tanks, is pumped into the half‐cells of the RFB when power is required . Among various types of RFBs, all‐vanadium aqueous RFBs using proton exchange membranes, such as a Nafion, are considered to be commercially successful . Recently, non‐aqueous RFBs using organic electrolyte are being studied as an alternative to replace water in aqueous RFBs, since organic electrolyte which has a wider window of electrochemical potentials than that of water would provide a higher energy density via higher operating potentials and/or higher concentration of redox active species in organic solvent …”

Section: Introductionmentioning

confidence: 99%

“…Because most anions have intrinsically lower mobility than protons, AEMs with low ion conductivity have a high cell resistance, which impedes the high‐performance of the RFB. On the other hand, the AEM has an advantage: it prevents ions from entering the membrane via the Donnan exclusion effect, so prevents the crossover of active cation species …”

Section: Introductionmentioning

confidence: 99%

A Chitosan/Urushi Anion Exchange Membrane for a Non-aqueous Redox Flow Battery

et al. 2017

View full text Add to dashboard Cite

A new bio‐based anion exchange composite membrane that consists of a chitosan/urushi (C/U) pseudo‐interpenetrating polymer network (IPN) coated on the surface of a porous support was prepared for non‐aqueous redox flow battery (RFB). Celgard membranes composed of polypropylene were used as the porous support. A C/U pseudo‐IPN film was formed by laccase‐catalysed polymerization and aerobic oxidative polymerization. The ion conductivity increased with an increasing amount of chitosan in the C/U coating layer, and the composite membranes had lower vanadium acetylacetonate permeability than a pristine Celgard support. The performance of a non‐aqueous RFB increased with an increasing amount of chitosan in the C/U layer in the surface‐modified Celgard membrane. The coulombic efficiency and energy efficiency values were 66% and 40.5%, respectively, for a RFB with a surface‐modified membrane that contained 17 wt% chitosan in the C/U layer. These values were higher than those of the commercial Neosepta AHA membrane, which had a dense structure, indicating that the C/U pseudo‐IPN layer on the porous support provided the selectivity of the redox active species.

show abstract

“…The family of sulfonated aromatic polymers (SAP 7,9,16,17 ) is of particular interest, because it is well known that, in fuel cell devices, the gas permeability of SAP is below that of perfluorinated ionomers 18,19 , due to more tortuous and less connected hydrated channels; the gas permeability can be further reduced by the presence of cross-link bonds 20 . The behavior of SAP with respect to the cation permeability and the effect of cross-linking is explored in this work.…”

Section: Introductionmentioning

confidence: 99%

“…Efforts have therefore been made to develop less expensive membranes with lower permeability and better mechanical properties [9][10][11][12] .…”

Section: Introductionmentioning

confidence: 99%

Comparative study of the cation permeability of protonic, anionic and ampholytic membranes

2017

View full text Add to dashboard Cite

The vanadium ion permeability of various ion-conducting polymer membranes was determined using a home-made apparatus. The study includes proton-conducting sulfonated poly(ether ether ketone) (SPEEK) with various cross-linking degrees, anion-conducting membranes, such as polysulfone with quaternary ammonium groups (PSU-QA) and sulfaminated PEEK (SA-PEEK), and amphoteric membranes based on PEEK containing both sulfonic and sulfonamide groups (SAM-PEEK) that can conduct both cations and anions. The polymer structure was investigated by NMR spectroscopy. The permeability of SPEEK decreases with the cross-linking degree and can be up to two orders below the permeability of a Nafion 117 reference membrane (1.4 10 -6 cm 2 /min). The cation permeability of SA-PEEK attains values as low as 5.0 10 -10 cm 2 /min, whereas amphoteric SAM-PEEK has a cation permeability of 7.0 10 -10 cm 2 /min. A factor or merit is introduced, defined as the ratio of ion conductivity and ion permeability ; the highest value, corresponding to the best compromise of high ion conductivity and low permeability of electrochemically active ions, is found for highly cross-linked SPEEK, SA-PEEK and SAM-PEEK membranes. The influence of the polymer backbone (PEEK or PSU), the degree of cross-linking, determined by NMR spectroscopy, and the grafted ionic groups (sulfonic acid, sulfammonium, and quaternary ammonium) on the cation permeability is discussed.

show abstract

Recent development of polymer membranes as separators for all-vanadium redox flow batteries

Cited by 101 publications

References 68 publications

A review of all‐vanadium redox flow battery durability: Degradation mechanisms and mitigation strategies

A review of all‐vanadium redox flow battery durability: Degradation mechanisms and mitigation strategies

A Chitosan/Urushi Anion Exchange Membrane for a Non-aqueous Redox Flow Battery

Comparative study of the cation permeability of protonic, anionic and ampholytic membranes

Contact Info

Product

Resources

About