Journal
CELL REPORTS PHYSICAL SCIENCE
Volume 1, Issue 12, Pages -Publisher
CELL PRESS
DOI: 10.1016/j.xcrp.2020.100265
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Funding
- Singapore National Research Foundation [NRF-NRFF2017-04]
- Czech Science Foundation [20-16124J]
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The quest for a suitable electrolyte formulation is pivotal to the success of rechargeable magnesium batteries. A simple conventional electrolyte having high compatibility with magnesium anode and cathode material is in great demand. Herein, we report a simple yet effective electrolyte formulation, comprising magnesium triflate (Mg(OTf)(2)) and magnesium chloride in monoglyme, that can enable highly reversible, conditioning-free, and homogeneous magnesium deposition. Galvanostatic Mg plating/stripping demonstrates an average Coulombic efficiency of 99.4% over 1,000 cycles. The cells show excellent performance at current densities up to 3 mA cm(-2) and areal capacities up to 5 mAh cm(-2). Post mortem analysis unveils the formation of a robust solid electrolyte interphase, which leads to improved kinetics at the magnesium electrode. A prototype Mg battery with Mo6S8 cathode demonstrates stable cycling performance over 100 cycles. This study shows that rational design of Mg(OTf)(2)-based electrolytes is a promising direction toward the realization of high-performance magnesium batteries.
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