Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1606653 | Journal of Alloys and Compounds | 2016 | 8 Pages |
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 Li+ ionic conductivity (compared to the reported isostructural garnet oxide Li-conductor) of ÏLi 3 Ã 10â7 and 6 Ã 10â7 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 ÏLi can be increased by one order of magnitude in the whole temperature range measured.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
M. Brighi, P. Schouwink, Y. Sadikin, R. Äerný,