In the search for future beyond-Li-ion batteries, Mg batteries present a safe option due to lower pyrophoricity and no formation of dendrites during electrodeposition and dissolution. However, the practical voltage window of Mg batteries is limited by the paucity of both cathodically and anodically stable electrolytes. Recently, carborane,^1,2 fluoroalkoxyaluminate³ and fluoroalkoxyborate-based⁴ electrolytes emerged as potential candidates for high-voltage Mg electrolytes. Inspired by the latter work, we demonstrate in this presentation that magnesium perfluoroalkoxyaluminate as a Mg electrolyte can be rationally designed and synthesized to exhibit unprecedented anodic stability while retaining the capability of Mg electrodeposition and dissolution. Synthesis, spectroscopic characterization and electrochemistry of the electrolyte will be discussed.

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