Affiliation:
1. Department of Electrochemistry II and Theory I Helmholtz Institute of Ulm (HIU) Helmholtz Str. 11 89081 Ulm Germany
2. Karlsruhe Institute of Technology (KIT) P.O. Box 3640 76021 Karlsruhe Germany
3. Institute of Electrochemistry Ulm University Albert-Einstein-Allee 47 89081 Ulm Germany
4. Faculty of Science Cairo University 12613 Cairo Egypt
Abstract
AbstractDeveloping 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‐Mg3[HCOO]6; Mg salt : MgCl2‐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.
Funder
Center of Excellence for Learning in Education, Science and Technology
Deutsche Forschungsgemeinschaft
Subject
General Energy,General Materials Science,General Chemical Engineering,Environmental Chemistry