Here, the effect of the addition of an ionic liquid DEME?TFSI to an electrolyte solution of Mg(HMDS) 2-MgCl 2 in THF was studied electrochemically and spectroscopically. Reversible magnesium deposition/dissolution was achieved with the DEME?TFSI-modified electrolyte. This electrolyte shows higher ionic conductivity, and a linear relationship was observed between the ionic conductivity and the concentration of DEME?TFSI in THF solution of Mg(HMDS) 2-MgCl 2. Mg-Mo 6S 8 coin cells have also been successfully cycled using Mg(HMDS) 2-MgCl 2 electrolyte with the addition of DEME?TFSI. Raman and NMR spectroscopy suggest that DEME?TFSI facilitates magnesium deposition/dissolution by improving ionic conductivity of the electrolyte.
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