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Establishing a Stable Anode–Electrolyte Interface in Mg Batteries by Electrolyte Additive

Li, Zhenyou 1; Diemant, Thomas 1; Meng, Zhen 1; Xiu, Yanlei 1; Reupert, Adam 1; Wang, Liping 1; Fichtner, Maximilian 1; Zhao-Karger, Zhirong 1
1 Center for Electrochemical Energy Storage Ulm & Karlsruhe (CELEST), Karlsruher Institut für Technologie (KIT)

Abstract:

Simple magnesium salts with high electrochemical and chemical stability and adequate ionic conductivity represent a new-generation electrolyte for magnesium (Mg) batteries. Similar to other Mg electrolytes, the simple-salt electrolyte also suffers from high charge-transfer resistance on the Mg surface due to the adsorbed species in the solution. In the current study, we built a model Mg cell system with the Mg[B(hfip)4]2/DME electrolyte and Chevrel phase Mo6S8 cathode, to demonstrate the effect of such anode–electrolyte interfacial properties on the full-cell performance. It was found that the cell required additional activation cycles to achieve its maximal capacity. The activation process is mainly attributed to the conditioning of the anode–electrolyte interface, which could be boosted by introducing an additive amount of Mg(BH4)2 to the Mg[B(hfip)4]2/DME electrolyte. Electrochemical and spectroscopic analyses revealed that the Mg(BH4)2 additive helps to remove the native oxide layer and promotes the formation of a solid electrolyte interphase layer on Mg. As a result, the full cell with the additive-containing electrolyte delivered a stable capacity from the second cycle onward. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000136275
Veröffentlicht am 09.08.2021
Originalveröffentlichung
DOI: 10.1021/acsami.1c08476
Scopus
Zitationen: 19
Web of Science
Zitationen: 18
Dimensions
Zitationen: 19
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Institut für Nanotechnologie (INT)
Post Lithium Storage (POLiS)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 07.2021
Sprache Englisch
Identifikator ISSN: 1944-8244, 1944-8252
KITopen-ID: 1000136275
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 28
Seiten 33123–33132
Vorab online veröffentlicht am 06.07.2021
Schlagwörter Mg intercalation; noncorrosive electrolyte; electrolyte additive; electrode−electrolyte interfaces; Chevrel phase Mo6S8
Nachgewiesen in Scopus
Dimensions
Web of Science
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