Sulfonated polyimide membranes with different non-sulfonated diamines for vanadium redox battery applications

Zhang, Yaping; Li, Jinchao; Zhang, Hua; Zhang, Shuai; Huang, Xiaodong

doi:10.1016/j.electacta.2014.10.084

Cited by 65 publications

(27 citation statements)

References 29 publications

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“…There are three weight loss stages for both membranes. The 1 st mass loss changed from 100 to 150 C is ascribed to remove little moisture absorbed by -SO 3 H. The 2nd is attributed to degradation of -SO 3 H ranged from 300 to 450 C, which is agreement with what was reported elsewhere [16,17,47,48]. The 3rd stage is related to decomposition of the polymer backbone.…”

Section: Thermal Stability and Mechanical Performancesupporting

confidence: 89%

“…Obviously, the positive electrolyte (VO 2+ /VO 2 + ) is more oxidizing than negative electrolyte (V 2+ /V 3+ ), causing both bSPI-8 and SPI membranes' surfaces in contact with positive electrolytes to be more seriously destructed. Similar experimental phenomenon was also reported in another study [17]. In addition, the cross-sections of initial membrane and after cycling charge-discharge testing of bSPI-8 membrane are depicted in Fig.…”

Section: Structure and Morphology Analysissupporting

confidence: 74%

“…Commonly-used strategies to improve the stability of non-fluorinated proton conductive membranes are as the following: On one hand, organic-inorganic composite membranes such as sulfonated poly (ether ether ketone)/graphene oxide (SPEEK/GO) [13], sulfonated poly(phthalazinone ether ketone)/tungstophosphoric acid (SPPEK/TPA) [14], sulfonated poly(arylene ether sulfone)/laponite-SO 3 H (SPEAS/SLa) [15] and sulfonated polyimide/s-MoS 2 (SPI/s-MoS 2 ) membranes [16] were prepared by adding inorganic fillers or segments into non-fluorinated polymers; On another hand, the monomers used to synthesize non-fluorinated polymers were designed and optimized, in order that the stability of nonfluorinated polymers themselves can be improved. Our earlier work [17] verified the feasibility of the latter strategy, which spurs us to do more relative work about preparation of non-fluorinated polymer membranes made of more stable monomers.…”

Section: Introductionmentioning

confidence: 89%

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Synthesis and properties of branched sulfonated polyimides for membranes in vanadium redox flow battery application

Zhang

Huang

et al. 2016

Electrochimica Acta

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Section: Thermal Stability and Mechanical Performancesupporting

confidence: 89%

Section: Structure and Morphology Analysissupporting

confidence: 74%

Section: Introductionmentioning

confidence: 89%

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Synthesis and properties of branched sulfonated polyimides for membranes in vanadium redox flow battery application

Zhang

Huang

et al. 2016

Electrochimica Acta

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“…The costs of Fb‐SPI membranes are estimated to be approximately $170–220 m −2 , which is far lower than the price of Nafion membrane $600–800 m −2 . For comparison, l‐SPI membrane (DS: 50 %) was also synthesized and prepared according to the procedures reported in literature …”

Section: Methodsmentioning

confidence: 99%

Fluorine‐Containing Branched Sulfonated Polyimide Membrane for Vanadium Redox Flow Battery Applications

et al. 2018

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A series of fluorine‐containing branched sulfonated polyimide (Fb‐SPI) membranes with different degrees of branching (0–12 %) were synthesized through polycondensation. The chemical structure of Fb‐SPI‐10 membrane was confirmed using ATR‐FTIR and 1H NMR spectroscopy. The physico‐chemical properties of Fb‐SPI membranes were systematically investigated and compared to linear SPI (l‐SPI) and Nafion 117 membranes. The vanadium‐ion permeabilities of Fb‐SPI membranes (2.45–0.99×10−7 cm2 min−1) are much lower than that of Nafion 117 (17.1×10−7 cm2 min−1) membranes. Besides, the chemical stability of Fb‐SPI membranes is superior to that of l‐SPI membranes. During 500‐time continuous cyclic charge‐discharge measurements, the VRFB assembled with a Fb‐SPI‐10 membrane shows higher coulombic efficiency (98.4–99.7 %), higher or close energy efficiency (69.0–79.7 %) from 40 to 80 mA cm−2, and higher or close capacity retention (52.8–100 %) from 40 to 70 mA cm−2 compared with a device using a Nafion 117 membrane. All of these results demonstrate that the as‐selected Fb‐SPI‐10 membrane has promising potential for VRFB applications.

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“…9,10 Furthermore, SPI is sufficiently thermally stable to be used in VRFBs. In our earlier work, a series of proton-conductive membranes based on SPI for VRFB applications were developed 11 and as-prepared SPI membranes showed high proton selectivity, low vanadium ion permeability and good single VRFB performance. However, pristine SPI membranes also exhibit lower antioxidant ability compared with Nafion membranes.…”

Section: Introductionmentioning

confidence: 99%

Sulfonated poly(imide-siloxane) membrane as a low vanadium ion permeable separator for a vanadium redox flow battery

Zhang

Huang

et al. 2015

Polym J

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A sulfonated poly(imide-siloxane) (SPI-PDMS) membrane was prepared and evaluated for its performance in a vanadium redox flow battery (VRFB). Fourier transform infrared spectroscopy analysis verified the successful synthesis of SPI-PDMS, and scanning electron microscopy images and energy-dispersive spectroscopy results illustrated the homogeneity of the membrane. The chemical stability of the SPI-PDMS membrane was superior to that of the pristine sulfonated polyimide membrane. The as-prepared SPI-PDMS membrane showed an order-of-magnitude lower permeability of VO 2+ ion (1.92 × 10 − 7 cm 2 min − 1 ) in contrast to Nafion 117 (17.1 × 10 − 7 cm 2 min − 1 ) and it possessed a much longer self-discharge time (550 h above 1.3 V) than Nafion 117 (65 h above 1.3 V). The SPI-PDMS-containing VRFB exhibited higher coulombic efficiency (98.50%-99.10%) at current densities ranging from 20 to 80 mA cm − 2 than that of Nafion 117 (80.6%-94.8%). At current densities lower than 70 mA cm − 2 , the energy efficiency of the SPI-PDMS-containing VRFB was higher than that of Nafion 117. Cyclic chargedischarge testing demonstrated that the VRFB containing the SPI-PDMS membrane had good operational stability. Overall, this low-cost SPI-PDMS membrane exhibits excellent battery performance and has considerable potential for applications in VRFBs. INTRODUCTIONThe vanadium redox flow battery (VRFB) has been attracting increasing attention as a promising candidate for large-scale energy storage systems because of its advantageous features, including long life, high reliability, non-pollution, low cost and high efficiency. 1-3 The proton-conductive membrane is an important component of VRFBs. The membrane must separate the catholyte and the anolyte, while allowing the passage of protons to form a circuit. The ideal protonconductive membrane should have a low permeability to vanadium ions, high proton conductivity, good chemical stability, strong mechanical integrity and low cost. 4 To date, the perfluorinated sulfonic acid membranes such as Nafion membranes (Dupont Co., Wilmington, DE, USA) have been widely used in VRFB systems, owing to their high proton conductivity and excellent chemical stability. However, Nafion membranes also possess disadvantages such as high vanadium ion permeability and cost, which limit their largescale commercial application in VRFB systems. 5 Consequently, a series of novel proton-conductive membranes with lower vanadium ion permeability and cost have been developed for VRFB applications such as sulfonated poly(phenylsulfone), 6 sulfonated poly(ether ether ketone) 7 and sulfonated polysulfone 8 membranes.Sulfonated polyimide (SPI) is one of the most promising potential candidates for VRFB membranes, because the polyimide can form a compact microstructure to control vanadium ion permeability, and

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Sulfonated polyimide membranes with different non-sulfonated diamines for vanadium redox battery applications

Cited by 65 publications

References 29 publications

Synthesis and properties of branched sulfonated polyimides for membranes in vanadium redox flow battery application

Synthesis and properties of branched sulfonated polyimides for membranes in vanadium redox flow battery application

Fluorine‐Containing Branched Sulfonated Polyimide Membrane for Vanadium Redox Flow Battery Applications

Sulfonated poly(imide-siloxane) membrane as a low vanadium ion permeable separator for a vanadium redox flow battery

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