High Active Magnesium Trifluoromethanesulfonate-Based Electrolytes for Magnesium-Sulfur Batteries.

Author(s) Yang, Y.; Wang, W.; Nuli, Y.; Yang, J.; Wang, J.
Journal ACS Appl Mater Interfaces
Date Published 2019 Mar 06

The shortage of high-performance and easily prepared electrolyte has hindered the progress of rechargeable magnesium-sulfur (Mg-S) batteries. In this paper, we develop a new electrolyte based on Mg(CFSO)-AlCl dissolved in tetrahydrofuran and tetraglyme mixed solvents. Mg(SOCF) as an Mg source is nonnucleophilic, easy to handle, and much cheaper than Mg(TFSI) (TFSI = bis(trifluoromethanesulfonyl)imide). After modification with anthracene (π stabilizing agent) as a coordinating ligand to stabilize the Mg ions and MgCl to improve the interface properties by accelerating the reaction of Mg(CFSO) with AlCl, the electrolyte exhibits a low overpotential for overall Mg deposition and dissolution, moderate anodic stability (3.25 V on Pt, 2.5 V on SS, 2.0 V on Cu, and 1.85 V on Al, respectively), and a suitable ionic conductivity (1.88 mS cm). More importantly, this electrolyte modulated by Li-salt additives exhibits good compatibility with S cathode and can be applicable for Mg-S batteries. The rational formulation of the new electrolyte could provide a new avenue for simply prepared Mg electrolytes of Mg-S and rechargeable magnesium batteries.

DOI 10.1021/acsami.8b20180
ISSN 1944-8252
Citation ACS Appl Mater Interfaces. 2019;11(9):90629072.

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