Publications

Compatibility of a Conventional Non-aqueous Magnesium Electrolyte with a High Voltage V₂O₅ Cathode and Mg Anode

Zavadil, Kevin R.; Sa, Niya S.; Proffit, Danielle L.; Lipson, Albert L.; Liu, Miao L.; Gautam, Gopalakrishnan S.; Hahn, Nathan H.; Feng, Zhenxing F.; Fister, Timothy T.; Ren, Yang R.; Sun, Cheng-Jun S.; Vaughey, John T.; Liao, Chen L.; Fenter, Paul A.; Ceder, Gerbrand C.; Burrell, Anthony K.

A major roadblock for magnesium ion battery development is the availability of an electrolyte that can deposit Mg reversibly and at the same time is compatible with a high voltage cathode. We report a prospective full magnesium cell utilizing a simple, non-aqueous electrolyte composed of high concentration magnesium bis(trifluoromethane sulfonyl)imide in diglyme, which is compatible with a high voltage vanadium pentoxide (V₂O₅) cathode and a Mg metal anode. For this system, plating and stripping of Mg metal can be achieved with magnesium bis(trifluoromethane sulfonyl)imide in diglyme electrolyte over a wide concentration range, however, reversible insertion of Mg into V₂O₅ cathode can only be attained at high electrolyte concentrations. Reversible intercalation of Mg into V₂O₅ is characterized and confirmed by X-ray diffraction, X-ray absorption near edge spectroscopy and energy dispersive spectroscopy.