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unige:78892 
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Fast ion conduction in garnet-type metal borohydrides Li3K3Ce2(BH4)12 and Li3K3La2(BH4)12 |
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| 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 | Borohydride — Powder diffraction — Garnet — Solid state electrolyte | |
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Article (Published version) (1.2 MB) - Limited access to UNIGE Other version: http://linkinghub.elsevier.com/retrieve/pii/S0925838815317746 |
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| Structures | ||
| Research group | Groupe Cerny | |
| Project | FP7: ECOSTORE | |
| Citation (ISO format) | 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. https://archive-ouverte.unige.ch/unige:78892 |
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