The Unexpected Discovery of New Mg Complexes As Electrolytes for Rechargeable Magnesium Batteries

The electrolytes play a pivotal role in the multivalent batteries. Here we will report the unexpected discovery of new complexes as electrolytes for magnesium batteries. Eliminating the usage of Lewis acids, the electrolytes are safer than conventional magnesium organohaloaluminate. The electrolytes have a high coulombic efficiency for Mg plating/dissolution and the anodic stability is increased to 3.3 V vs Mg. The preparation and characterization of the new electrolytes will be presented, including the syntheses, multinuclear NMR spectroscopy, the hypothesis of the product formation, the electrochemical characterization such as ionic conductivities and transport numbers. The capabilities of the electrolyte with Chevrel Phase Mo6S8 and other cathodes will also be discussed.