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Electrochemical Properties and Speciation in Mg(HMDS) 2 -Based Electrolytes for Magnesium Batteries as a Function of Ethereal Solvent Type and Temperature.
Langmuir : the ACS Journal of Surfaces and Colloids 2017 September 20
Magnesium batteries are a promising alternative to lithium-ion batteries due to the widespread abundance of magnesium and its high specific volumetric energy capacity. Ethereal solvents such as tetrahydrofuran (THF) are commonly used for magnesium-ion electrolytes due to their chemical compatibility with magnesium metal, but the volatile nature of THF is a concern for practical application. Herein, we investigate magnesium bis(hexamethyldisilazide) plus aluminum chloride (Mg(HMDS)2 -AlCl3 ) electrolytes in THF, diglyme, and tetraglyme at varying temperature. We find that, despite the higher thermal stability of the glyme-based electrolytes, THF-based electrolytes have better reversibility at room temperature. Deposition/stripping efficiency is found to be a strong function of temperature. Diglyme-based Mg(HMDS)2 -AlCl3 electrolytes are found to not exchange as quickly as THF and tetraglyme, stabilizing AlCl2 + and facilitating undesired aluminum deposition. Raman spectroscopy, 27 Al NMR, and mass spectrometry are used to identify solution speciation.
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