High Current Density, Long Duration Cycling of Soluble Organic Active Species for Non-Aqueous Redox Flow Batteries

Chemical structures of phenothiazine derivatives investigated and cycling performance of the most soluble derivative (MEEPT): (a) Charge-discharge curves; (b) capacities and efficiencies as a function of cycle number.

Scientific Achievement

We simultaneously engineered a soluble catholyte molecule and low resistance flow cell, enabling unprecedented high current density and undetectable capacity fade cycling of an organic molecule in a non-aqueous flow cell.

Significance and Impact

This work demonstrates that non-aqueous flow batteries can achieve the high current densities required for economically viable cycling with minimal capacity fade, at moderate-to-high active species concentrations

Research Details

  • Highly soluble phenothiazine derivatives are designed for high solubility and stability.
  • A non-aqueous compatible flow cell is engineered with the lowest ever reported area-specific resistance.

Aggressive cycling at 100 mA cm-2 for 100 cycles is demonstrated with undetectable capacity fade

DOI: 10.1039/C6EE02027E

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