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Issue 35, 2015
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Modeling the voltage loss mechanisms in lithium–sulfur cells: the importance of electrolyte resistance and precipitation kinetics

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Abstract

Understanding of the complex electrochemical, transport, and phase-change phenomena in Li–S cells requires experimental characterization in tandem with mechanistic modeling. However, existing Li–S models currently contradict some key features of experimental findings, particularly the evolution of cell resistance during discharge. We demonstrate that, by introducing a concentration-dependent electrolyte conductivity, the correct trends in voltage drop due to electrolyte resistance and activation overpotentials are retrieved. In addition, we reveal the existence of an often overlooked potential drop mechanism in the low voltage-plateau which originates from the limited rate of Li2S precipitation.

Graphical abstract: Modeling the voltage loss mechanisms in lithium–sulfur cells: the importance of electrolyte resistance and precipitation kinetics

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Publication details

The article was received on 19 Jun 2015, accepted on 07 Aug 2015 and first published on 07 Aug 2015


Article type: Communication
DOI: 10.1039/C5CP03566J
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Citation: Phys. Chem. Chem. Phys., 2015,17, 22581-22586
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    Modeling the voltage loss mechanisms in lithium–sulfur cells: the importance of electrolyte resistance and precipitation kinetics

    T. Zhang, M. Marinescu, L. O'Neill, M. Wild and G. Offer, Phys. Chem. Chem. Phys., 2015, 17, 22581
    DOI: 10.1039/C5CP03566J

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