Unique Behavior of Dimethoxyethane (DME)/Mg(N(SO2CF3)(2))(2) Solutions

Michael Salama; Ivgeni Shterenberg; Haim Gizbar; Neta N. Eliaz; Monica Kosa; Keren Keinan-Adamsky; Michal Afri

doi:10.1021/acs.jpcc.6b07733

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Unique Behavior of Dimethoxyethane (DME)/Mg(N(SO2CF3)(2))(2) Solutions

Journal article

Peer reviewed

Unique Behavior of Dimethoxyethane (DME)/Mg(N(SO2CF3)(2))(2) Solutions

Michael Salama, Ivgeni Shterenberg, Haim Gizbar, Neta N. Eliaz, Monica Kosa, Keren Keinan-Adamsky and Michal Afri

Journal of Physical Chemistry C, Vol.120(35), pp.19586-19594

Sep/2016

DOI: https://doi.org/10.1021/acs.jpcc.6b07733

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Abstract

Mg(N(SO2CF3)(2))(2) (MgTFSI2) solutions with dimethoxyethane (DME) exhibit a peculiar behavior. Over a certain range of salt content, they form two immiscible phases of specific electrolyte concentrations. This behavior is unique, as both immiscible phases comprise the same constituents. Thus, this miscibility gap constitutes an exceptionally intriguing and interesting case for the study of such phenomena. We studied these systems from solutions structure perspective. The study included a wide variety of analytical tools including single crystal X-ray diffraction, multinuclei NMR, and Raman spectroscopy coupled with density functional theory calculations. We rigorously determined the structure of the MgTFSI2/DME solutions and developed a plausible theory to explain the two-phase formation phenomenon. We also determined the exchange energy of the "caging" DME molecules solvating the central magnesium ion. Additionally, by measuring the ions' diffusion coefficients, we suggest that the caged Me2+ and TEST move as free ions in the solution. Knowledge of the arrangement of the solvent/cation/anion structures in these solutions enables us to explain their properties. We believe that this study is important in a wide context of solutions chemistry and nonaqueous electrochemistry. Also, MgTFSI2/DME solutions are investigated as promising electrolyte solutions for rechargeable magnesium batteries. This study may serve as an important basis for developing further MgTFSI2/ether based solutions for such an interesting use.

Details

Title: Unique Behavior of Dimethoxyethane (DME)/Mg(N(SO2CF3)(2))(2) Solutions
Creators: Michael Salama (null)
Ivgeni Shterenberg (null)
Haim Gizbar (null)
Neta N. Eliaz (null)
Monica Kosa (null)
Keren Keinan-Adamsky (null)
Michal Afri (null)
Resource Type: Journal article
Publication Details: Journal of Physical Chemistry C, Vol.120(35), pp.19586-19594; Sep/2016
Number of pages: 9
Language: English
DOI: https://doi.org/10.1021/acs.jpcc.6b07733
Grant note: Israel Science Foundation (ISF) of the INREP project_ALMAME_DELIMITER_
Scientific Unit: The Weizmann Institute of Science
Record Identifier: 993263448203596

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