All-organic non-aqueous redox flow batteries with advanced composite polymer-ceramic Li-conductive membrane

N. A. Ovsyannikov, E. I. Romadina, N. O. Akhmetov, N. A. Gvozdik, A. V. Akkuratov, M. A. Pogosova, K. J. Stevenson

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1 Citation (Scopus)


Composite membranes based on polyvinylidene fluoride (PVdF) binder and Li1.4Al0.4Ge0.2Ti1.4(PO4)3 (LAGTP) ceramic filler as prospective solid electrolytes for non-aqueous redox flow batteries were investigated. Membrane fabrication details and thorough material characterization is provided to show improved performance. Studied membranes possess high Li-ion conductivity of (2.7 ± 0.6)•10−4 S cm−1, uniform microstructure, and excellent stability towards acetonitrile. Moreover, a new redox flow battery configuration is demonstrated with designed composite membranes in all-organic non-aqueous redox flow batteries. For the comparison, commercial Neosepta AHA anion-exchange membranes were evaluated. Triarylamine-based catholyte and viologen-based anolyte materials, which were recently designed in our laboratory, were used as redox couples. The comparison revealed lower resistance, but faster crossover of composite PVdF + LAGTP membrane (permeability rates < 10-5 cm2 min-1); still, this is considered as acceptable for application in flow batteries. H-cells assembled with novel composite membrane exhibit Coulombic efficiency of over 97% and high charge-discharge cycling stability: after the initial 15 cycles, the capacity stabilized at 37 mA h L1 corresponding to 70% utilization of active materials. The membrane proposed exhibits a beneficial combination of functional characteristics that allows considering it as a credible alternative to the contemporary available polymeric commercial membranes for all-organic redox flow batteries.

Original languageEnglish
Article number103810
JournalJournal of Energy Storage
Publication statusPublished - Feb 2022


  • Composite membrane
  • Ionic conductivity
  • Organic redox-active materials
  • Permeability
  • Polymer-ceramic membrane
  • Redox flow batteries


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