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Surface Engineering of a Mg Electrode via a New Additive to Reduce Overpotential

Meng, Zhen 1; Li, Zhenyou 1; Wang, Liping 1; Diemant, Thomas 1; Bosubabu, Dasari 1; Tang, Yushu ORCID iD icon 2; Berthelot, Romain; Zhao-Karger, Zhirong 1; Fichtner, Maximilian 2
1 Karlsruher Institut für Technologie (KIT)
2 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)


In nonaqueous Mg batteries, inactive adsorbed species and the passivation layer formed from the reactive Mg with impurities in the electrolyte seriously affect the Mg metal/electrolyte interface. These adlayers can impede the passage of Mg$^{2+}$ ions, leading to a high Mg plating/stripping overpotential. Herein, we report the properties of a new additive, bismuth triflate (Bi(OTf)$_{3}$), for synthesizing a chlorine-free Mg electrolyte to enhance Mg plating/stripping from initial cycles. The beneficial effect of Bi(OTf)$_{3}$ can be ascribed to Bi/Mg$_{3}$Bi$_{2}$ formed in situ on the Mg metal surface, which increases the charge transfer during the on–off transition by reducing the adsorption of inactive species on the Mg surface and enhancing the resistance of the reactive surface to passivation. This simple method provides a new avenue to improve the compatibility between the Cl-free Mg electrolyte and the Mg metal anode.

Postprint §
DOI: 10.5445/IR/1000138325
Veröffentlicht am 06.12.2022
DOI: 10.1021/acsami.1c07648
Zitationen: 9
Web of Science
Zitationen: 9
Zitationen: 11
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Institut für Nanotechnologie (INT)
Post Lithium Storage (POLiS)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 08.2021
Sprache Englisch
Identifikator ISSN: 1944-8244, 1944-8252
KITopen-ID: 1000138325
HGF-Programm 38.02.01 (POF IV, LK 01) Fundamentals and Materials
Erschienen in ACS applied materials & interfaces
Verlag American Chemical Society (ACS)
Band 13
Heft 31
Seiten 37044–37051
Vorab online veröffentlicht am 30.07.2021
Nachgewiesen in Web of Science
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