The Power of Stoichiometry: Conditioning and Speciation of MgCl/AlCl in Tetraethylene Glycol Dimethyl Ether-Based Electrolytes.

In many Mg-based battery systems, the reversibility of Mg deposition and dissolution is lowered by parasitic formation processes of the electrolyte. Therefore, high Coulombic efficiencies of Mg deposition and dissolution are only achieved after several "conditioning" cycles. As this phenomenon is especially reported for AlCl-containing solutions, this study focuses on the "conditioning" mechanisms of MgCl/AlCl and MgHMDS/AlCl (HMDS = hexamethyldisilazide) in tetraethylene glycol dimethyl ether (TEGDME)-based electrolytes.