It will be shown that fluorinated alkoxyborates based magnesium electrolytes are weakly coordinated systems, which exhibit a high anodic stability (4.3 V vs. Mg), high ionic conductivity (7 mS/cm) and high Coulombic efficiency (>99%) of reversible magnesium deposition. Owing to the non-corrosive, chemically stable nature and the robust, economic synthesis in one step from commercially available materials, this design concept of new, weakly coordinated ion conducting salts opens a promising avenue towards the realization of high-energy magnesium batteries.

Synthesis, chemical and structural analysis and electrochemical properties will be presented, as well as its application to Mg-S batteries, where it shows superior performance.