Effect of non-sulfonated diamine monomer on branched sulfonated polyimide membrane for vanadium redox flow battery application

Summary A new kind of alkoxy silane functionalized polymer (ASFP) is synthesized by selectively functionalized carboxyl groups as a novel inorganic precursor polymer to prepare organic‐inorganic hybrid membrane for vanadium redox flow battery (VRFB) system. The novel hybrid membrane has been fabricated by interconnection between hydrophilic domains of Nafion and ASFP functional group. The effective concentration of ASFP for hybrid membrane is 25% (wt/wt). The proton conductivity and selectivity of the hybrid membrane are comparable with those of the Nafion212 membrane, which is mainly attributed by the presence of additional hydrophilic domains in the hybrid membrane. The proton conductivity and ion exchange capacity of the Nafion‐ASFP (75:25) membrane is 0.061 S/cm and 0.68 meq/g, respectively. Remarkably, the Nafion‐ASFP membrane shows a low vanadium permeability (1.259 × 10−7 cm2/min) and high selectivity, which is an excellent advantage. As a result, the hybrid membrane shows comparable efficiency performance with Nafion212 over 50 cycles. Notably, the VRFB unit cell with Nafion‐ASFP membrane achieves higher coulombic efficiency than Nafion212. The hybrid membrane reveals a new route to develop an alternative fluorinated polymer membrane with numerous advantages especially cost‐effectiveness, homogeneous dispersion of inorganic silica precursor materials in the hybrid membrane without deterioration of mechanical strength, and lower vanadium ion crossover for VRFB system.

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“…Then, the wet membrane were weighed ( W wet ). The WU and dimensional change of the membrane were calculated as follows:

Water uptake (() %) = \frac{W_{wet} - W_{dry}}{W_{dry}} \times 100,

where W wet is the weight of wet (hydrated) membrane and W dry is the weight of dried membrane.…”

Section: Methodsmentioning

confidence: 89%

“…Then, the wet membrane were weighed (W wet ). The WU and dimensional change of the membrane were calculated as follows 36,37 :…”

Section: Physicochemical and Electrochemical Properties Of Membranesmentioning

confidence: 99%

Development of perfluorosulfonic acid polymer‐based hybrid composite membrane with alkoxysilane functionalized polymer for vanadium redox flow battery

et al. 2019

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“…Besides, the broad absorption peaks at 1029, 1098 and 1198 cm À 1 are corresponding to the symmetric and asymmetric stretching vibration of À SO 3 H groups. [18] As shown in the enlarged ATR-FTIR patterns of À SO 3 H group, the reflectivity of the peaks of -SO 3 H groups decrease with the increase of the content of s-MC in these bSPI/s-MC composite membranes. Such a result indicates that introduction of s-MC can effectively increase the total number of À SO 3 H groups of bSPI/s-MC composite membranes.…”

Section: Ft-ir Spectra 1 H-nmr Spectrum and Eds Analysismentioning

confidence: 84%

“…In our previous work, the branched SPI (bSPI) membrane showed high proton selectivity and excellent performance in VRFB application. [18] However, the proton conductivity of this bSPI membrane is still lower than that of Nafion membrane. According to the literatures, [19][20][21][22] the inorganic or organic materials could be introduced into SPI polymers by blending to prepare SPI-based composite membranes with improved proton conductivities and excellent VRFB performance.…”

Section: Introductionmentioning

confidence: 83%

“…However, the low proton conductivities resulted from poor micro‐phase separation of pure SPI membranes hinder their further commercial applications in VRFBs. In our previous work, the branched SPI (bSPI) membrane showed high proton selectivity and excellent performance in VRFB application . However, the proton conductivity of this bSPI membrane is still lower than that of Nafion membrane.…”

Section: Introductionmentioning

confidence: 97%

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Branched Sulfonated Polyimide/Sulfonated Methylcellulose Composite Membranes with Remarkable Proton Conductivity and Selectivity for Vanadium Redox Flow Batteries

et al. 2020

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A series of branched sulfonated polyimide (bSPI)/sulfonated methylcellulose (s‐MC) composite membranes composed of a designed and synthesized bSPI polymer and functionalized s‐MC are prepared by using a facile solution casting method for vanadium redox flow batteries (VRFBs). Among all bSPI/s‐MC composite membranes, the optimized bSPI/s‐MC‐20 % composite membrane has the best proton selectivity of 2.45×105 S min cm−3, which is 14.4 times as high as the Nafion 115 membrane. The bSPI/s‐MC‐20 % composite membrane possesses superior proton conductivity compared to most reported SPI‐based composite membranes for VRFBs. The VRFB with a bSPI/s‐MC‐20 % composite membrane shows excellent battery efficiencies (CE=99.2–98.0 %, EE=66.3–77.6 %) and capacity retention (73.3–47.2 %). Moreover, the cost of the bSPI/s‐MC‐20 % composite membrane is only a quarter of that of a commercial Nafion 115 membrane. This work develops a new strategy to fabricate cheap bSPI‐based composite membranes by introducing a suitable functionalized biomass material.

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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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Effect of non-sulfonated diamine monomer on branched sulfonated polyimide membrane for vanadium redox flow battery application

Cited by 38 publications

References 40 publications

Development of perfluorosulfonic acid polymer‐based hybrid composite membrane with alkoxysilane functionalized polymer for vanadium redox flow battery

Development of perfluorosulfonic acid polymer‐based hybrid composite membrane with alkoxysilane functionalized polymer for vanadium redox flow battery

Branched Sulfonated Polyimide/Sulfonated Methylcellulose Composite Membranes with Remarkable Proton Conductivity and Selectivity for Vanadium Redox Flow Batteries

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

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