Poly(terphenylene) anion exchange membranes with high conductivity and low vanadium permeability for vanadium redox flow batteries (VRFBs)

Wang, Tongshuai; Jeon, Jong Yeob; Han, Junyoung; Kim, Jae Heon; Bae, Chulsung; Kim, Sangil

doi:10.1016/j.memsci.2019.117665

Cited by 74 publications

(43 citation statements)

References 36 publications

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“…Aemion+ (50 mm) maintained a stable CE of 98.5 AE 0.5% for the duration of the cycling experiment, which is in line for typical AEMs in literature. 20,30,31 A high EE of 81% was measured for cycle one which decayed to 76% upon completion of cycling. EE decay can be linked to membrane resistance values in Fig.…”

Section: Resultsmentioning

confidence: 99%

Performance and stability comparison of Aemion™ and Aemion+™ membranes for vanadium redox flow batteries

et al. 2021

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Section: Resultsmentioning

confidence: 99%

Performance and stability comparison of Aemion™ and Aemion+™ membranes for vanadium redox flow batteries

et al. 2021

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“…Very recently,Kim, Bae et al prepared two novel terphenylbased AEMs with different arrangements,i.e., para-terphenyl (p-TPN1) and meta-terphenyl (m-TPN1) for VRFBs (Figure 2). [26] Compared with the biphenyl AEM (BPN1-100 in Figure 2), the terphenyl AEMs exhibited better H + /VO 2+ selectivity.T he authors attributed this to the narrower charged channels of the latter,w hich might originate from the higher hydrophobicity and stiffness of the terphenylbased backbone. Covalent-crosslinking is another straightforward approach to restrain the excessive swelling of IEMs.H owever,i tu sually severely limits the movement of the polymer chain, resulting in poor water uptake and low proton conductivity.T oa lleviate this problem, Xi and co-workers proposed to induce microphase-separated structures in cross- linked CEMs by involving both rigid hydrophilic segments and flexible hydrophobic segments on the main-chains (CSPI-DMDAi nF igure 2).…”

Section: Molecular Design Of Backbonesmentioning

confidence: 95%

A Chemistry and Microstructure Perspective on Ion‐Conducting Membranes for Redox Flow Batteries

et al. 2021

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Redox flow batteries (RFBs) are among the most promising grid‐scale energy storage technologies. However, the development of RFBs with high round‐trip efficiency, high rate capability, and long cycle life for practical applications is highly restricted by the lack of appropriate ion‐conducting membranes. Promising RFB membranes should separate positive and negative species completely and conduct balancing ions smoothly. Specific systems must meet additional requirements, such as high chemical stability in corrosive electrolytes, good resistance to organic solvents in nonaqueous systems, and excellent mechanical strength and flexibility. These rigorous requirements put high demands on the membrane design, essentially the chemistry and microstructure associated with ion transport channels. In this Review, we summarize the design rationale of recently reported RFB membranes at the molecular level, with an emphasis on new chemistry, novel microstructures, and innovative fabrication strategies. Future challenges and potential research opportunities within this field are also discussed.

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“…In an operating battery system, the membrane is in contact with concentrated H 2 SO 4 , containing vanadium cat-ions with four different oxidation states. At the same time, due to the partitioning of ions into the membrane, the concentration electrolyte affects the ion transport behavior and ion equilibrium within the membrane [ 35 , 36 ]. The P value of the tested membranes was calculated by the change of VO 2+ concentration in the MgSO 4 solution with time, as shown in Figure 6 .…”

Section: Resultsmentioning

confidence: 99%

Blended Anion Exchange Membranes for Vanadium Redox Flow Batteries

Son

Jung

et al. 2021

Polymers

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In this study, blended anion exchange membranes were prepared using polyphenylene oxide containing quaternary ammonium groups and polyvinylidene fluoride. A polyvinylidene fluoride with high hydrophobicity was blended in to lower the vanadium ion permeability, which increased when the hydrophilicity increased. At the same time, the dimensional stability also improved due to the excellent physical properties of polyvinylidene fluoride. Subsequently, permeation of the vanadium ions was prevented due to the positive charge of the anion exchange membrane, and thus the permeability was relatively lower than that of a commercial proton exchange membrane. Due to the above properties, the self-discharge of the blended anion exchange membrane (30.1 h for QA–PPO/PVDF(2/8)) was also lower than that of the commercial proton exchange membrane (27.9 h for Nafion), and it was confirmed that it was an applicable candidate for vanadium redox flow batteries.

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Poly(terphenylene) anion exchange membranes with high conductivity and low vanadium permeability for vanadium redox flow batteries (VRFBs)

Cited by 74 publications

References 36 publications

Performance and stability comparison of Aemion™ and Aemion+™ membranes for vanadium redox flow batteries

Performance and stability comparison of Aemion™ and Aemion+™ membranes for vanadium redox flow batteries

A Chemistry and Microstructure Perspective on Ion‐Conducting Membranes for Redox Flow Batteries

Blended Anion Exchange Membranes for Vanadium Redox Flow Batteries

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