The unexpected discovery of the Mg(HMDS)₂/MgCl₂ complex as a magnesium electrolyte for rechargeable magnesium batteries

Abstract

We developed a unique class of non-Grignard, aluminum-free magnesium electrolytes based on a simple mixture of magnesium compounds: magnesium hexamethyldisilazide (Mg(HMDS)2) and magnesium chloride (MgCl2).

Polyanthraquinone‐Based Organic Cathode for High‐Performance Rechargeable Magnesium‐Ion Batteries

“…[10e] We also validated the same PAQS polymer as cathode material for magnesium-ion batteries using our own non-nucleophilic electrolyte. [13] The presence of carbonyl groups in the anthraquinonyl moieties prevents the use of any nucleophilic magnesium electrolytes, such as the well-known Grignard-based APC (PhMgCl-AlCl 3 ) or DCC (nBu 2 Mg + EtAlCl 2 ) electrolytes. [3,14] Thus, the non-nucleophilic 0.3 m Mg(HMDS) 2 -4MgCl 2 (HMDS: hexamethyldisilazide) in THF (tetrahydrofuran) solution was chosen as the electrolyte in this study.…”

Magnesium Borohydride-Based Electrolytes Containing 1-butyl-1-methylpiperidinium bis(trifluoromethyl sulfonyl)imide Ionic Liquid for Rechargeable Magnesium Batteries

“…Meanwhile, inorganic magnesium salt solutions synthesized by the acid-base reaction of MgCl 2 and Lewis acidic compounds such as AlCl 3 show high coulombic efficiency, low overpotential for magnesium deposition-dissolution and good anodic stability. [15][16][17][18] However, these electrolytes may corrode non-inert current collectors at lower anodic potentials duo to the presence of halides in the cation and anion components of the electrolytes, although some of these electrolytes have shown impressive stability against electrochemical oxidation.19 Hence, it is still necessary to find electrolytes with high stabilities on non-inert current collectors for a practical rechargeable Mg battery system. Nelson et al showed that decreasing the chloride content in Mg electrolytes by switching the Lewis acid from AlCl 3 to Al(OPh) 3 greatly improves the anodic stability up to 5 V on both Pt and stainless steel electrodes.…”

Magnesium-sulfur battery: its beginning and recent progress

“…[60] Single-crystal x-ray diffraction unveils the solid structure with the ion pair [Mg 2 Cl 3 (THF) 6 [61] The same group also made an extended study on the reactions of MgCl 2 with phenolate/alkoxide Mg chlorides. [62] The electrolytes prepared by reacting (tBuO)…”