Using a Chloride-Free Magnesium Battery Electrolyte to Form a Robust Anode–Electrolyte Nanointerface

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Using a Chloride-Free Magnesium Battery Electrolyte to Form a Robust Anode–Electrolyte Nanointerface
Title:
Using a Chloride-Free Magnesium Battery Electrolyte to Form a Robust Anode–Electrolyte Nanointerface
Other Titles:
Nano Letters
Publication Date:
14 September 2021
Citation:
Horia, R., Nguyen, D.-T., Eng, A. Y. S., & Seh, Z. W. (2021). Using a Chloride-Free Magnesium Battery Electrolyte to Form a Robust Anode–Electrolyte Nanointerface. Nano Letters, 21(19), 8220–8228. https://doi.org/10.1021/acs.nanolett.1c02655
Abstract:
Magnesium bis(hexamethyldisilazide) (Mg(HMDS)2)-based electrolytes are compelling candidates for rechargeable magnesium batteries due to their high compatibility with magnesium metal anode. However, the usual combination of Mg(HMDS)2 with chloride salts limits their practical application due to severe corrosion of cell components and low anodic stability. Herein, we report for the first time, a chloride-free Mg(HMDS)2-based electrolyte in 1,2-dimethoxyethane. By chemically controlling the moisture content using tetrabutylammonium borohydride as a moisture scavenger, the electrolyte demonstrates outstanding electrochemical performance in magnesium plating/stripping, with an average Coulombic efficiency of 98.3% over 150 cycles, and is noncorrosive to cell components. Surface analysis and depth profiling of the magnesium metal anode reveals the formation of a robust solid electrolyte interphase at the anode–electrolyte nanointerface, which allows magnesium plating/stripping to occur reversibly. The electrolyte also demonstrates good compatibility with a copper sulfide nanomaterial cathode, which exhibits a high initial discharge capacity of 261.5 mAh g–1.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the Singapore National Research Foundation - NRF Fellowship
Grant Reference no. : NRF-NRFF2017-04
Description:
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.nanolett.1c02655
ISSN:
1530-6992
1530-6984
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mghmds2-dme14-sept-clean.pdf 1.89 MB PDF Open
nl1c02655-si-001.pdf 1.27 MB PDF Open