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    Investigating the Potential of Alkali Metal Plumba-closo-Dodecaborate (B11H11Pb2–) Salts as Solid-State Battery Electrolytes

    96774.pdf (1.124Mb)
    Access Status
    Open access
    Authors
    Hales, Thomas A.
    Møller, Kasper T.
    Humphries, Terry D.
    D’Angelo, Anita M.
    Buckley, Craig E.
    Paskevicius, Mark
    Date
    2023
    Type
    Journal Article
    
    Metadata
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    Citation
    Hales, T.A. and Møller, K.T. and Humphries, T.D. and D’Angelo, A.M. and Buckley, C.E. and Paskevicius, M. 2023. Investigating the Potential of Alkali Metal Plumba-closo-Dodecaborate (B11H11Pb2–) Salts as Solid-State Battery Electrolytes. Journal of Physical Chemistry C. 127 (2): pp. 949-957.
    Source Title
    Journal of Physical Chemistry C
    DOI
    10.1021/acs.jpcc.2c07226
    ISSN
    1932-7447
    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/FT160100303
    URI
    http://hdl.handle.net/20.500.11937/97010
    Collection
    • Curtin Research Publications
    Abstract

    Metal dodecaborate salts have been identified as a new class of ion conductors that are highly tunable. A [B-H] unit within the dodecaborate anion can be replaced with a Pb atom to create a dipole and anisotropy within the anion to tune the crystal structure of alkali metal salts, enhancing ion conductivity for solid-state electrolyte (SSE) applications in batteries. Li2B11H11Pb·xH2O shows superionic conductivity up to ∼7 mS cm-1 at 120 °C, proving it comparable to state-of-the-art LiCB11H12 at these temperatures. Dehydration of the Li salt occurs above 120 °C, causing changes in the crystal structure and a decrease in the ion conductivity. Na2B11H11Pb·xH2O shows modest ion conductivity (0.01 mS cm-1 at 170 °C), whereas the potassium salt shows conductivities below 1 × 10-5 mS cm-1. The B11H11Pb2- analogues are proposed to be inferior ion conductors to the CB11H12- varieties due to the divalent B11H11Pb2- anion causing stronger bonding between the cation and anion, possibly higher energy required to move from position to position within the crystal structure. Despite this, the insertion of a lead atom into the dodecaborate cage shows promise in allowing high ion conductivity in the solid state.

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