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    Na2B11H13 and Na11(B11H14)3(B11H13)4 as potential solid-state electrolytes for Na-ion batteries

    96776.pdf (1.165Mb)
    Access Status
    Open access
    Authors
    Souza, Diego H.P.
    D'Angelo, A.M.
    Humphries, Terry D.
    Buckley, Craig E.
    Paskevicius, Mark
    Date
    2022
    Type
    Journal Article
    
    Metadata
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    Citation
    Souza, D.H.P. and D'Angelo, A.M. and Humphries, T.D. and Buckley, C.E. and Paskevicius, M. 2022. Na2B11H13 and Na11(B11H14)3(B11H13)4 as potential solid-state electrolytes for Na-ion batteries. Dalton Transactions. 51 (36): pp. 13848-13857.
    Source Title
    Dalton Transactions
    DOI
    10.1039/d2dt01943d
    ISSN
    1477-9226
    Faculty
    Faculty of Science and Engineering
    School
    School of Elec Eng, Comp and Math Sci (EECMS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/LE170100199
    URI
    http://hdl.handle.net/20.500.11937/97012
    Collection
    • Curtin Research Publications
    Abstract

    Solid-state sodium batteries have attracted great attention owing to their improved safety, high energy density, large abundance and low cost of sodium compared to the current Li-ion batteries. Sodium-boranes have been studied as potential solid-state electrolytes and the search for new materials is necessary for future battery applications. Here, a facile and cost-effective solution-based synthesis of Na2B11H13 and Na11(B11H14)3(B11H13)4 is demonstrated. Na2B11H13 presents an ionic conductivity in the order of 10−7 S cm−1 at 30 °C, but undergoes an order-disorder phase transition and reaches 10−3 S cm−1 at 100 °C, close to that of liquids and the solid-state electrolyte Na-β-Al2O3. The formation of a mixed-anion solid-solution, Na11(B11H14)3(B11H13)4, partially stabilises the high temperature structural polymorph observed for Na2B11H13 at room temperature and it exhibits Na+ conductivity higher than its constituents (4.7 × 10−5 S cm−1 at 30 °C). Na2B11H13 and Na11(B11H14)3(B11H13)4 exhibit an oxidative stability limit of 2.1 V vs. Na+/Na.

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