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Fast ion conduction in garnet-type metal borohydrides Li3K3Ce2(BH4)12 and Li3K3La2(BH4)12

Published in Journal of Alloys and Compounds. 2016, vol. 662, p. 388-395
Abstract Complex hydrides are a family of compounds which have attracted a lot of attention in the last decade for various clean energy-related purposes, from solid state hydrogen storage to materials suitable in Li-ion batteries. We present two new garnet-type borohydride materials suitable as solid state electrolytes. Li3K3Ce2(BH4)12 and Li3K3La2(BH4)12 show unexpectedly high room temperature Liþ ionic conductivity (compared to the reported isostructural garnet oxide Li-conductor) of sigma_Li 3 x 10**7 and 6 x 10**7 S/cm with corresponding activation energies of Ea = 0.79 and Ea = 0.67 eV, respectively, which result from large bottleneck windows in the conduction path. The effect of heterovalent cation substitution is investigated as means of tailoring ionic conductivity. Doping with divalent Sr2+ and Eu2+ shows that sigma_Li can be increased by one order of magnitude in the whole temperature range measured.
Keywords BorohydridePowder diffractionGarnetSolid state electrolyte
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Research group Groupe Cerny
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BRIGHI, Matteo et al. Fast ion conduction in garnet-type metal borohydrides Li3K3Ce2(BH4)12 and Li3K3La2(BH4)12. In: Journal of Alloys and Compounds, 2016, vol. 662, p. 388-395. doi: 10.1016/j.jallcom.2015.11.218 https://archive-ouverte.unige.ch/unige:78892

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Deposited on : 2015-12-22

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