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Title: Reversible S 0 /MgS x Redox Chemistry in a MgTFSI 2 /MgCl 2 /DME Electrolyte for Rechargeable Mg/S Batteries

Journal Article · · Angewandte Chemie (International Edition)
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  1. Department of Chemical and Bimolecular Engineering University of Maryland College Park MD 20740 USA
  2. Electrochemistry Branch, Power and Energy Division Sensor and Electron Devices Directorate U.S. Army Research Laboratory Adelphi MD 20783 USA

Abstract The redox chemistry of magnesium and its application in rechargeable Mg batteries has received increasing attention owing to the unique benefits of Mg metal electrodes, namely high reversibility without dendrite formation, low reduction potentials, and high specific capacities. The Mg/S couple is of particular interest owing to its high energy density and low cost. Previous reports have confirmed the feasibility of a rechargeable Mg/S battery; however, only limited cycling stability was achieved, and the complicated procedure for the preparation of the electrolytes has significantly compromised the benefits of Mg/S chemistry and hindered the development of Mg/S batteries. Herein, we report the development of the first rechargeable Mg/S battery with a MgTFSI 2 /MgCl 2 /DME electrolyte (DME=1,2‐dimethoxyethane, TFSI=bis(trifluoromethanesulfonyl)imide) and realize the best cycling stability among all reported Mg/S batteries by suppressing polysulfide dissolution. Mechanistic studies show that the battery works via S 0 /MgS x redox processes and that the large voltage hysteresis is mainly due to the Mg anode overpotential.

Sponsoring Organization:
USDOE
OSTI ID:
1393995
Journal Information:
Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Vol. 56 Journal Issue: 43; ISSN 1433-7851
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English
Citation Metrics:
Cited by: 130 works
Citation information provided by
Web of Science

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