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    Divalent closo-monocarborane solvates for solid-state ionic conductors

    96772.pdf (2.075Mb)
    Access Status
    Open access
    Authors
    Berger, Amanda
    Ibrahim, Ainee
    Buckley, Craig E.
    Paskevicius, Mark
    Date
    2023
    Type
    Journal Article
    
    Metadata
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    Citation
    Berger, A. and Ibrahim, A. and Buckley, C.E. and Paskevicius, M. 2023. Divalent closo-monocarborane solvates for solid-state ionic conductors. Physical Chemistry Chemical Physics. 25 (7): pp. 5758-5775.
    Source Title
    Physical Chemistry Chemical Physics
    DOI
    10.1039/d2cp05583j
    ISSN
    1463-9076
    Faculty
    Faculty of Science and Engineering
    School
    School of Elec Eng, Comp and Math Sci (EECMS)
    URI
    http://hdl.handle.net/20.500.11937/97008
    Collection
    • Curtin Research Publications
    Abstract

    Li-ion batteries have held the dominant position in battery research for the last 30+ years. However, due to inadequate resources and the cost of necessary elements (e.g., lithium ore) in addition to safety issues concerning the components and construction, it has become more important to look at alternative technologies. Multivalent metal batteries with solid-state electrolytes are a potential option for future battery applications. The synthesis and characterisation of divalent hydrated closo-monocarborane salts - Mg[CB11H12]2·xH2O, Ca[CB11H12]2·xH2O, and Zn[CB11H12]2·xH2O - have shown potential as solid-state electrolytes. The coordination of a solvent (e.g. H2O) to the cation in these complexes shows a significant improvement in ionic conductivity, i.e. for Zn[CB11H12]2·xH2O dried at 100 °C (10−3 S cm−1 at 170 °C) and dried at 150 °C (10−5 S cm−1 at 170 °C). Solvent choice also proved important with the ionic conductivity of Mg[CB11H12]2·3en (en = ethylenediamine) being higher than that of Mg[CB11H12]2·3.1H2O (2.6 × 10−5 S cm−1 and 1.7 × 10−8 S cm−1 at 100 °C, respectively), however, the oxidative stability was lower (<1 V (Mg2+/Mg) and 1.9 V (Mg2+/Mg), respectively). Thermal characterisation of the divalent closo-monocarborane salts showed melting and desolvation, prior to high temperature decomposition.

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