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Maximizing Vanadium Deployment in Redox Flow Batteries Through Chelation.

Scott E Waters1, Casey M Davis1, Jonathan R Thurston1

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A novel vanadium flow battery electrolyte using diethylenetriaminepentaacetate (DTPA) offers high solubility and reducing potential. This advancement enables efficient grid-scale energy storage with enhanced safety and doubled energy density.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Vanadium flow batteries (VFBs) are promising for grid-scale energy storage.
  • Current VFBs face challenges with solubility, energy density, and operating conditions.

Purpose of the Study:

  • To develop a highly soluble and reducing vanadium-based electrolyte for flow batteries.
  • To investigate the performance of a novel chelated vanadium flow battery system.

Main Methods:

  • Tailoring vanadium coordination to a 7-coordinate geometry using diethylenetriaminepentaacetate (DTPA).
  • In situ bulk spectroelectrochemistry to analyze oxidized and reduced states.
  • Assembly and operation of flow batteries under near-neutral pH conditions.

Main Results:

  • Achieved a highly soluble (>1.3 M) and reducing (-1.2 V vs Ag/AgCl) [V(DTPA)] electrolyte.
  • Demonstrated flow batteries with discharge energy densities of 12.5 Wh L⁻¹ and high efficiency.
  • Developed the first chelated flow battery using the same aminopolycarboxylate ligand for both electrolytes.

Conclusions:

  • The DTPA-chelated vanadium electrolyte offers comparable performance to existing VFBs.
  • This system doubles the effective discharge energy of vanadium and minimizes safety risks.
  • Presents a viable alternative for grid-scale energy storage.