Mg is earth abundant and low-cost (ca. 24 times cheaper than Li), and as an anode material, Mg is safe to use (vs. Li, Li-ion, or Na-ion batteries). Its high gravimetric capacity (2,333 Ah/kg) and high reduction potential (-2.37 V vsSHE) allow the assembly of high-energy density batteries. However, despite rapid research progress, the lack of high performance Mg²⁺conductive electrolytes still presents a primary technical hurdle for developing practical Mg batteries. The presentation will cover our research efforts in developing high performance Mg electrolytes for Mg rechargeable batteries. Specifically, we will present the synthesis and electrochemical performance of ternary Mg/MgCl₂/AlCl₃(MMAC) electrolytes and a novel Cl free perfluorinated pinacolatoborate Mg electrolyte (Mg-FPB). These MMAC and Mg-FPB electrolytes exhibited up to 100% Coulumbic efficiency, and 164 mV overpotenail for Mg deposition, and up to 4.5 V vs Mg anodic stability. Solution and interfacial chemistry of the presented Mg electrolytes will be discussed in detail. In addition, we will share our results on applying these advanced electrolytes in developing high energy density Mg/S and Mg/MnO₂ rechargeable batteries.

References:

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