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Physicochemical Characterization of a Na-H-F Thermal Battery Material

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2021-02-06
Authors
Humphries, Terry
Rawal, A.
Rowles, Matthew
Prause, C.R.
Bird, Julianne
Paskevicius, Mark
Sofianos, M. Veronica
Buckley, Craig
Date
2020
Type
Journal Article

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Humphries, T.D. and Rawal, A. and Rowles, M.R. and Prause, C.R. and Bird, J.E. and Paskevicius, M. and Sofianos, M.V. et al. 2020. Physicochemical Characterization of a Na-H-F Thermal Battery Material. Journal of Physical Chemistry C. 124 (9): pp. 5053-5060.
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Journal of Physical Chemistry C
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Faculty
Faculty of Science and Engineering
School
John de Laeter Centre (JdLC)
School of Electrical Engineering, Computing and Mathematical Sciences (EECMS)
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Abstract

Copyright © 2020 American Chemical Society. Fluorine-substituted sodium hydride is investigated for application as a thermal energy storage material inside thermal batteries. A range of compositions of NaHxF1-x (x = 0, 0.5, 0.7, 0.85, 0.95, 1) have been studied using synchrotron radiation powder X-ray diffraction (SR-XRD), near-edge X-ray absorption fine structure spectroscopy (NEXAFS), and nuclear magnetic resonance spectroscopy (NMR), with the thermal conductivity and melting points also being determined. SR-XRD and NMR spectroscopy studies identified that the solid solutions formed during synthesis contain multiple phases rather than a single stoichiometric compound, despite the materials exhibiting a single melting point. As the fluorine content of the materials increases, the Na-H(F) bond length decreases, increasing the stability of the compound. This trend is also observed during melting point analysis where increasing the fluorine content increases the melting point of the material; that is, x < 0.3 (i.e., F- > 0.7) enables melting at temperatures above 750 °C.