Towards High-Performance Nonaqueous Redox Flow Electrolyte via Ionic Modification of Active Species

(Top) Material Synthesis for Highly Soluble Ferrocene Derivative
(Left) NMR Decoding Solvation
(Right) Li-Graphite Hybrid Anode Decent cyclability at high conc.

Scientific Achievement

Material tailoring led to a significant increase in the solubility of the ferrocene redox material. NMR measurement was able to decode the solvation mechanism and explain the solubility increase of the tailored compound. A Li-graphite hybrid anode enabled the nonaqueous Li/organic cell design to produce decent cyclability at high redox material concentrations and deliver energy density of ~45 Wh/L.

Significance and Impact

Rational molecular engineering is viable to improve solubility of redox materials. High-conc cycling is challenging for nonaqueous flow chemistry, but improved cell design can help.

Research Details

  • NMR measurements were performed to help understand the molecule-solvent interactions.
  • Flow cell cycling at various conditions was carried out to determine the performance-limiting factors: redox material concentration, electrolyte additive, and hybrid anode design.

Work performed at Pacific Northwest National Laboratory (JCESR partner) by X. Wei, L. Cosimbescu, W. Xu*, J.Z. Hu, M. Vijayakumar, J. Feng, M.Y. Hu, X. Deng, J. Xiao, J. Liu, V. Sprenkle and W. Wang*, Adv. Energy Mater. 2015.

DOI: 10.1002/aenm.201400678

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