Rechargeable Lithium and Sodium Anodes in Chloroaluminate Molten Salts Containing Thionyl Chloride

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Abstract
Lithium and sodium deposition‐stripping studies were performed in room temperature buffered neutral chloroaluminate melts containing low concentrations of thionyl chloride . The solute promotes high cycling efficiencies of the alkali metals in these electrolytes. Staircase cyclic voltammetry and chronopotentiometry show cycling efficiencies of approximately 90% for both lithium and sodium. High cycling efficiencies are maintained following extended exposure of the melt to the dry box atmosphere and after time delays at open circuit. The performance of the systems is substantially improved over previous studies in room temperature melts containing hydrogen chloride as the promoting solute.

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