Rechargeable magnesium batteries are recognized as the most promising candidates for the post-lithium-ion battery due to their suitably negative electrode potential, high theoretical specific capacity, and improved safety compared to lithium.  However, current Grignard-based  Mg-ion electrolytes are extremely nucleophilic and sensitive to oxygen and moisture. Starting from commercially available phenols and ethyl magnesium chloride, we have synthesized a series of  non-Grignard electrolytes with various para-substituents.  Controlling the electron withdrawing ability of the para-substituent has resulted in the ability to shift the anodic stability of the electrolyte by ~700 mV.  The para-CF3 subsituted phenol exhibited the highest stability of 2.9 V vs Mg.  These electrolytes also show significantly improved stability to air and moisture, with no loss in electrochemical performance after stirring for 8 hours in air.

Enhanced oxidative stability of non-Grignard magnesium electrolytes through ligand modification

246th National Meeting (2013)

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