Solution-mediated reduction pathway enables Li–S cells to operate at lean electrolyte conditions

A solution reduction pathway mediated by Li2S4 is identified through electrochemical and operando X-ray absorption spectroscopy characterization to facilitate Li-S redox reactions that enable lean electrolyte Li-S cells.

Scientific Achievement

A solution-mediated reaction mechanism is proposed and confirmed for Li-S redox reactions through electrochemical and operando X-ray absorption spectroscopy characterization.

Significance and Impact

The solution-mediated reaction pathway bypasses traditional surface reactions in Li-S cells that cause passivation-induced premature failure and enables Li-S operation under lean-electrolyte conditions.

Research Details

  • A novel solution-mediated sulfur reduction pathway is demonstrated via a strategy retaining Li2S4 in solution.
  • Operando X-ray absorption spectroscopy characterization confirms the solution reaction pathway.
  • The new pathway decouples the sulfur reduction pathway from both electrolyte quantity and electroactive surface area.
  • A practical Li-S cell is developed under the E/S ratio of 3 mLE gs-1 with a stable cycle life over 100 cycles.

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DOI:  10.1016/j.nanoen.2020.105041

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