Lithium Lanthanum Titanate Single Crystals: Dependence of Lithium-Ion Conductivity on Crystal Domain Orientation

Kobayashi, Shunsuke; Daisaku Yokoe; Yasuyuki Fujiwara; Kazuaki Kawahara; Yuichi Ikuhara; Akihide Kuwabara

doi:10.51094/jxiv.5128

##article.authors##

Kobayashi, Shunsuke Japan Fine Ceramics Center
Daisaku Yokoe Japan Fine Ceramics Center
Yasuyuki Fujiwara Shinshu University
Kazuaki Kawahara The University of Tokyo
Yuichi Ikuhara The University of Tokyo
Akihide Kuwabara Japan Fine Ceramics Center

DOI:

https://doi.org/10.51094/jxiv.5128

キーワード:

Lithium Lanthanum Titanate、 Single crystal、 Solid electrolyte、 Li-ion conductivity、 Crystal orientation

抄録

Lithium lanthanum titanate La_2/3-xLi_3xTiO₃(LLTO) has the potential to exhibit the highest L i-ion conductivity among oxide-based electrolytes owing to the fast Li-ion diffusion derived from its crystal structure. Herein, bulk Li-ion conductivity of up to σ_bulk = 4.0 × 10^-3 S/cm at 300 K, which is approximately three to four times higher than that of LLTO polycrystals, was demonstrated using LLTO single crystals, and their dependence on crystal domain orientation was examined. A change in the activation energy, which was previously obscured owing to random crystal orientation, was observed at approximately 260 K. Furthermore, electron microscopy analysis indicated that the ionic conductivity of LLTOs remained higher because the region with the highest ionic conductivity was tilted away from the ideal conduction orientation. The results reported herein provide the highest conductivity in LLTO and important insights into their crystal structures, enabling higher conductivity in novel oxide-based electrolyte design.

利益相反に関する開示

The authors declare no competing financial interest.

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