Evaluation of (CF3SO2)(2)N- (TFSI) Based Electrolyte Solutions for Mg Batteries

Title
Evaluation of (CF3SO2)(2)N- (TFSI) Based Electrolyte Solutions for Mg Batteries
Author
선양국
Keywords
RECHARGEABLE MAGNESIUM BATTERIES; IN-SITU RAMAN; GRAPHITE-ELECTRODES; IONIC LIQUIDS; SPECTROSCOPY; BOROHYDRIDE; DISSOLUTION; COMPLEXES; SYSTEMS; LITHIUM
Issue Date
2015-12
Publisher
ELECTROCHEMICAL SOC INC
Citation
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v. 162, NO 13, Page. 7118-7128
Abstract
MgTFSI2 is the only ether-soluble "simple" magnesium salt. The poor electrochemical performance of Mg electrodes in its solutions hinders its practicality as a viable electrolyte for Mg batteries. MgTFSI2/DME solutions were demonstrated to dissolve large quantities of MgCl2 and produce electrolyte solutions with superior performance, though the electrochemical performance, mainly in terms of reversibility, of MgTFSI2/MgCl2 (DME) solutions cannot yet compete with that of organometallic based electrolyte solutions. We believe that the solutions' purity level governs the overall electrochemical performance, especially in solutions where a strong reductant (i.e Grignard reagent) is not present to act as an impurity scavenger. In this work, we alter the performance of the MgTFSI2/MgCl2 (DME) solutions through chemical and electrochemical conditioning and demonstrate the effect on the solutions' electrochemical characteristics. We demonstrate relatively high reversible behavior of Mg deposition/dissolution with crystalline uniformity of the Mg deposits, complemented by a fully reversible intercalation/de-intercalation process of Mg ions into Mo6S8 cathodes. We also investigated LiTFSI/MgCl2 solutions which exhibited even higher reversibility than MgTFSI2/MgCl2 (DME) solutions, which we attribute to the higher purity level available for the LiTFSI salt. (C) The Author(s) 2015. Published by ECS. All rights reserved.
URI
http://jes.ecsdl.org/content/162/13/A7118http://hdl.handle.net/20.500.11754/30143
ISSN
0013-4651; 1945-7111
DOI
10.1149/2.0161513jes
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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