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Effect of Guest Solvents on the Ionic Conductivity and Electrochemical Performance of Metal‐Organic Framework‐Based Magnesium Semi‐Solid Electrolytes

Hassan, Hagar K. 1; Hoffmann, Paul; Jacob, Timo 1
1 Helmholtz-Institut Ulm (HIU), Karlsruher Institut für Technologie (KIT)

Abstract:

Developing suitable electrolytes is crucial for the advancement of rechargeable magnesium batteries. Recently, metal-organic frameworks (MOFs) have shown a great interest in the field of solid electrolytes for metal ion batteries. However, the ionic conductivity as well as the electrolyte stability in the presence of Mg electrodes are shown to be strongly dependent on the guest solvent used to solvate Mg salts in MOFsSEs. Our measurements showed that full evacuation of the MOF structure before semi-solid electrolytes (sSEs) preparation is crucial for achieving relatively low Mg overpotentials regardless of the ionic conductivity values. Moreover, the behavior of the anode/MOFsSEs interfaces (MOF: α-Mg$_3$[HCOO]$_6$; Mg salt : MgCl$_2$-Mg[TFSI]$_2$ (1 : 1 wt %); guest solvent: acetone, DMF, DEG, DME and tetraglyme) was investigated by EIS, CV and galvanostatic measurements. The current comparative study of the electrochemical deposition processes of magnesium from MOFsSEs revealed that magnesium deposition/dissolution reactions vary depending on the MOF structure, the guest anion species as well as the nature of the guest solvents.


Verlagsausgabe §
DOI: 10.5445/IR/1000165793
Veröffentlicht am 03.01.2024
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2024
Sprache Englisch
Identifikator ISSN: 1864-5631, 1864-564X
KITopen-ID: 1000165793
HGF-Programm 38.02.02 (POF IV, LK 01) Components and Cells
Erschienen in ChemSusChem
Verlag Wiley-VCH Verlag
Band 17
Heft 5
Seiten Art.Nr.: e202301362
Vorab online veröffentlicht am 27.11.2023
Schlagwörter Mg batteries, metal-organic frameworks, semi-solid electrolytes, solvent effects, deposition
Nachgewiesen in Dimensions
Web of Science
Scopus
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