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Dynamics of porous and amorphous magnesium borohydride to understand solid state Mg-ion-conductors

Heere, M. 1; Hansen, A.-L. 1; Payandeh, S. H.; Aslan, N.; Gizer, G.; Sørby, M. H.; Hauback, B. C.; Pistidda, C.; Dornheim, M.; Lohstroh, W.
1 Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS), Karlsruher Institut für Technologie (KIT)


Rechargeable solid-state magnesium batteries are considered for high energy density storage and usage in mobile applications as well as to store energy from intermittent energy sources, triggering intense research for suitable electrode and electrolyte materials. Recently, magnesium borohydride, Mg(BH$_{4}$)$_{2}$, was found to be an effective precursor for solid-state Mg-ion conductors. During the mechanochemical synthesis of these Mg-ion conductors, amorphous Mg(BH$_{4}$)$_{2}$ is typically formed and it was postulated that this amorphous phase promotes the conductivity. Here, electrochemical impedance spectroscopy of as-received γ-Mg(BH$_{4}$)$_{2}$ and ball milled, amorphous Mg(BH$_{4}$)$_{2}$ confirmed that the conductivity of the latter is ~2 orders of magnitude higher than in as-received γ-Mg(BH$_{4}$)$_{2}$ at 353 K. Pair distribution function (PDF) analysis of the local structure shows striking similarities up to a length scale of 5.1 Å, suggesting similar conduction pathways in both the crystalline and amorphous sample. Up to 12.27 Å the PDF indicates that a 3D net of interpenetrating channels might still be present in the amorphous phase although less ordered compared to the as-received γ-phase. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000120972
Veröffentlicht am 07.07.2020
DOI: 10.1038/s41598-020-65857-6
Zitationen: 33
Zitationen: 38
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS)
Post Lithium Storage (POLiS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2045-2322
KITopen-ID: 1000120972
HGF-Programm 37.01.01 (POF III, LK 01) Fundamentals and Materials
Erschienen in Scientific reports
Verlag Nature Research
Band 10
Heft 1
Seiten Article No. 9080
Vorab online veröffentlicht am 03.06.2020
Nachgewiesen in Scopus
Web of Science
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