Efficient Magnesium Plating and Stripping in DOL/DME-Mg(HMDS)2-Based Electrolytes and Application in Mg/S Batteries

Bhardwaj, RK and Bhattacharyya, AJ (2021) Efficient Magnesium Plating and Stripping in DOL/DME-Mg(HMDS)2-Based Electrolytes and Application in Mg/S Batteries. In: ACS Applied Energy Materials .

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Abstract

We discuss here various combinations of magnesium bis (hexamethyldisilazide) (Mg(HMDS)2) with aluminum chloride (AlCl3) or magnesium chloride (MgCl2) in a solvent mixture of 1,3-dioxalane (DOL) and 1,2-dimethoxyethane (DME) (DOL/DME) as alternative electrolytes for practical rechargeable Mg-sulfur batteries. This design strategy is contrary to the usage of the solvents tetraglyme and tetrahydrofuran (THF) commonly used with Mg(HMDS)2 to generate electrolyte formulations for Mg/S batteries. Cyclic voltammetry measurements reveal a higher current response for DOL/DME compared to tetraglyme and THF solvent-based electrolytes. Exemplary plating/stripping efficiency is obtained at room temperature and is observed to be strongly dependent on the salt concentrations. The remarkable stripping/plating reversibility (at a current density of 0.1 mA cm-2) in a Mg||Mg symmetric cell indicates the extraordinary compatibility of the electrolyte with the Mg anode. The plating of Mg on the gold working electrode is ascertained using X-ray diffraction and scanning electron microscopy. The versatility of the Mg(HMDS)2-based electrolyte in the DOL/DME solvent is further utilized in a Mg/S cell with a simple carbon nanotube-sulfur composite as the cathode and Mg-metal as the anode. The DOL/DME-Mg(HMDS)2 electrolyte-based Mg/S cell exhibited stable electrochemical performance over widely varying current densities ranging from 0.05 to 0.5 C. ©

Item Type:	Journal Article
Publication:	ACS Applied Energy Materials
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society.
Keywords:	Aluminum chloride; Anodes; Carbon nanotubes; Cyclic voltammetry; Magnesium compounds; Organic solvents; Scanning electron microscopy; Secondary batteries; X ray diffraction; Yarn, 1,3-dioxalane/1,2-dimethoxyethane solvent; Alcl3/mgcl2in mg((hexamethyldisilazide) (mg)2-1,3-dioxalane/1,2-dimethoxyethane electrolyte; Design strategies; Mg 2; Mg stripping/plating; Mg-electrolyte; Mg/S battery; Solvent mixtures; Tetra-hydrofuran, Electrolytes
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	05 Jan 2022 10:55
Last Modified:	05 Jan 2022 10:55
URI:	http://eprints.iisc.ac.in/id/eprint/70860

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