The impact of bulk electrolysis cycling conditions on the perceived stability of redox active materials

Cycling time, rather than cycle number, is a better representation of the stability of redox-active species

Scientific Achievement

Under bulk electrolysis conditions, cycle time is a better measure of stability than cycle number and, for materials that are unstable in their charged state, the fractional capacity accessed is inversely related to cycle time until failure.

Significance and Impact

While standardized testing protocols for bulk electrolysis have yet to be agreed upon, consistency in data analysis can improve the comparison of materials-specific decay rates across the literature and consequently accelerate discovery science

Research Details

  • We investigated the decay of a model compound, 2,5-di-tert-butyl-1,4-bis(2-methoxyethoxy)benzene (DBBB), under a variety of commonly reported bulk electrolysis cycling conditions
  • Bulk electrolysis data is often reported as the capacity versus cycle number. However, at varying currents (C-rates), this “perceived stability” varies drastically.
  • Cycling time, rather than cycle number, is a better representation of stability as relevant chemical decomposition reactions are time-dependent.
  • Accessed capacity per cycle also impacts observed stability, due to the time- and concentration-dependence of decomposition processes.

Download this highlight

DOI: 10.1016/j.elecom.2019.106625

Latest Updates

See All
  • A Message from JCESR Director George Crabtree

    Despite the coronavirus challenges, JCESR continues to push the frontier of energy storage science as we telecommute from home, like much of the nation. We are turning our attention to computation, data analysis and paper writing which continues at a normal or higher pace, enabled … Read More

  • You’re invited: Idaho National Laboratory and JCESR webinar on energy storage (March 18 )

    Electrification is changing the energy landscape of the Mountain West region. While energy storage remains a key enabler to this transformation, infrastructure upgrade and supply chain development will be a key driver for this new economy. Join us on March 18 for a webinar where we’ll … Read More

  • Direct Nano-Synthesis Methods Notably Benefit Mg-Battery Cathode Performance

    A novel Mg cathode material – CuCo2S4 – was identified as a conversion material where direct nano-synthesis was required to provide the best electrochemical performance and deliver 350 mAh·g-1 at 60 °C, a capacity nearly double that of ball-milled material with similar dimensions. Read More

  • Quantifying Capacity Losses due to Solid Electrolyte Interphase Evolution

    We quantified the capacity loss originating in solid electrolyte interphase (SEI) growth during each cycle and extracted the proportionality constant for SEI growth following a parabolic growth law. This continuous SEI growth contributes to the increasing overpotential, leading to capacity fading at a given constant … Read More

  • On Lifetime and Cost of Redox-Active Organics for Aqueous Flow Batteries

    In this viewpoint, we recommend methodology for (1) testing aqueous organic flow batteries to better understand the fade mechanisms and failure modes, and for (2) techno-economic assessment of these batteries that incorporates the costs associated with electrolyte decay and replacement to articulate a feasible design … Read More