Vanadium redox flow battery efficiency and durability studies of sulfonated Diels Alder poly(phenylene)s

Journal Article · Sun Jul 01 04:00:00 EDT 2012 · Electrochemistry Communications, 20:48-21

DOI:https://doi.org/10.1016/j.elecom.2012.03.037· OSTI ID:1052919

Fujimoto, Cy H; Kim, Soowhan; Stains, Ronald; Wei, Xiaoliang; Li, Liyu; Yang, Zhenguo

Sulfonated Diels Alder poly(phenylene) (SDAPP) was examined for vanadium redox flow battery (VRFB) use. The ion exchange capacity (IEC) was varied from 1.4, 1.6 and 2.0 meq/g in order to tune the proton conductivity and vanadium permeability. Coulombic efficiencies between 92 to 99% were observed, depending on IEC (lower IEC, higher coulombic efficiencies). In all cases the SDAPP displayed comparable energy efficiencies (88 - 90%) to Nafion 117 (88%) at 50mA/cm2. Membrane durability also was dependent on IEC; SDAPP with the highest IEC lasted slightly over 50 cycles while SDAPP with the lowest IEC lasted over 400 cycles and testing was discontinued only due to time constraints. Accelerated vanadium lifetime studies were initialed with SDAPP, by soaking films in a 0.1 M V5+ and 5.0 M total SO4-2 solution. The rate of degradation was also proportional with IEC; the 2 meq/g sample dissolved within 376 hours, the 1.6 meq/g sample dissolved after 860 hours, while the 1.4 meq/g sample broke apart after 1527 hours.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1052919
• Report Number(s): PNNL-SA-86351; TE1400000
• Journal Information: Electrochemistry Communications, 20:48-21, Journal Name: Electrochemistry Communications, 20:48-21
• Country of Publication: United States
• Language: English

Related Subjects

SDAPP
accelerated lifetime testing
sulfonated Diels Alder poly(phenylene)
vanadium flow battery durability
vanadium ion permeability
vanadium redox flow battery