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Investigation of the Anode-Electrolyte Interface in a Magnesium Full-Cell with Fluorinated Alkoxyborate-Based Electrolyte

Roy, A.; Bhagavathi Parambath, V.; Diemant, T.; Neusser, G.; Kranz, C.; Behm, R. J.; Li, Z.; Zhao-Karger, Z.; Fichtner, M.


Magnesium (Mg) anode-electrolyte interaction is not trivial and investigation of the interfacial process can be helpful for the development of Mg batteries. In this work, we studied the Mg metal anode cycled in a chloride (Cl)-free magnesium tetrakis (hexafluoroisopropyloxy) borate electrolyte using a full-cell configuration with TiS$_{2}$ model cathode. Electrochemical measurements and structural analysis of the cathode showed reversible de-/magnesiation of TiS$_{2}$ with some entrapment of irreversibly bound Mg$^{2+}$. Electrochemical impedance spectroscopy (EIS) was applied to analyze the Mg-electrolyte interaction in a three-electrode system. The results showed a rapid increase in charge transfer resistance on the anode side with increasing resting time. In contrast, we observed a significant drop in the charge transfer impedance upon cycling along with the appearance of an additional semi-circle, which suggested to the development of a solid interphase. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) corroborated the EIS results and confirmed the solid interphase layer formation, in which MgF$_{2}$ was identified as the primary species contributing to its formation. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000142876
Veröffentlicht am 10.02.2022
DOI: 10.1002/batt.202100305
Zitationen: 4
Web of Science
Zitationen: 4
Zitationen: 6
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Post Lithium Storage (POLiS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 2566-6223
KITopen-ID: 1000142876
HGF-Programm 38.02.01 (POF IV, LK 01) Fundamentals and Materials
Erschienen in Batteries and Supercaps
Verlag John Wiley and Sons
Band 5
Heft 4
Seiten Art.-Nr.: e202100305
Vorab online veröffentlicht am 23.12.2021
Nachgewiesen in Web of Science
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