Structure and compatibility of a magnesium electrolyte with a sulphur cathode

Hee Soo Kim, Timothy S. Arthur, Gary D. Allred, Jaroslav Zajicek, John G. Newman, Alexander E. Rodnyansky, Allen G. Oliver, William C. Boggess and John Muldoon ()
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Hee Soo Kim: Toyota Research Institute of North America, 1555 Woodridge Avenue, Ann Arbor, Michigan 48105, USA.
Timothy S. Arthur: Toyota Research Institute of North America, 1555 Woodridge Avenue, Ann Arbor, Michigan 48105, USA.
Gary D. Allred: Synthonix
Jaroslav Zajicek: University of Notre Dame
John G. Newman: Evans Analytical Group
Alexander E. Rodnyansky: Evans Analytical Group
Allen G. Oliver: University of Notre Dame
William C. Boggess: University of Notre Dame
John Muldoon: Toyota Research Institute of North America, 1555 Woodridge Avenue, Ann Arbor, Michigan 48105, USA.

Nature Communications, 2011, vol. 2, issue 1, 1-6

Abstract: Abstract Magnesium metal is an ideal rechargeable battery anode material because of its high volumetric energy density, high negative reduction potential and natural abundance. Coupling Mg with high capacity, low-cost cathode materials such as electrophilic sulphur is only possible with a non-nucleophilic electrolyte. Here we show how the crystallization of the electrochemically active species formed from the reaction between hexamethyldisilazide magnesium chloride and aluminum trichloride enables the synthesis of a non-nucleophilic electrolyte. Furthermore, crystallization was essential in the identification of the electroactive species, [Mg2(μ-Cl)3·6THF]+, and vital to improvements in the voltage stability and coulombic efficiency of the electrolyte. X-ray photoelectron spectroscopy analysis of the sulphur electrode confirmed that the electrochemical conversion between sulphur and magnesium sulfide can be successfully performed using this electrolyte.

Date: 2011
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DOI: 10.1038/ncomms1435

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