Multielectron Cycling of a Low Potential Anolyte in Alkali Metal Electrolytes for Non-Aqueous Redox Flow Batteries

Schematic of flow cell for two electron anolyte cycling and the charge capacity vs. cycle number bellow. The cyclic voltammograms in the inset indicate no detectable degradation of the anolyte.

Scientific Achievement

High energy density organic redox flow batteries can only be realized when stable light-weight organic redox systems are developed, multi-electron redox molecules in combination with light-weight supporting electrolytes pave the way to this goal.

Significance and Impact

Potassium hexafluorophosphate (KPF6) has been identified to dramatically lower the equivalent weight of a recently developed organic anolyte system, while supporting flow cell cycling through two redox events at low potentials without detectable degradation of the redox material.

Research Details

  • Evaluation of various alkali electrolyte salts led to the selection of KPF6 as a prime candidate in order to reduce the equivalent weight of the redox system and meet techno-economic targets.
  • Stable two electron cycling of a promising pyridinium based anolyte has been demonstrated for 150 cycles with the use of KPF6 as the supporting electrolyte.

DOI: 10.1021/acsenergylett.7b00559

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