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Lithium Lanthanum Titanate Single Crystals: Dependence of Lithium-Ion Conductivity on Crystal Domain Orientation
Nano Letters ( IF 9.6 ) Pub Date : 2022-06-13 , DOI: 10.1021/acs.nanolett.2c01655 Shunsuke Kobayashi 1 , Daisaku Yokoe 1 , Yasuyuki Fujiwara 2 , Kazuaki Kawahara 3 , Yuichi Ikuhara 1, 3 , Akihide Kuwabara 1
Nano Letters ( IF 9.6 ) Pub Date : 2022-06-13 , DOI: 10.1021/acs.nanolett.2c01655 Shunsuke Kobayashi 1 , Daisaku Yokoe 1 , Yasuyuki Fujiwara 2 , Kazuaki Kawahara 3 , Yuichi Ikuhara 1, 3 , Akihide Kuwabara 1
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Lithium lanthanum titanate La2/3-xLi3xTiO3 (LLTO) has the potential to exhibit the highest Li-ion conductivity among oxide-based electrolytes because of the fast Li-ion diffusion derived from its crystal structure. Herein, bulk Li-ion conductivity of up to σbulk = 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 because of 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.
中文翻译：
钛酸镧锂单晶：锂离子电导率对晶畴取向的依赖性
钛酸镧锂 La 2/3- x Li 3 x TiO 3 (LLTO) 具有在氧化物基电解质中表现出最高的锂离子电导率的潜力，因为其晶体结构可实现快速的锂离子扩散。在此，体锂离子电导率高达 σ bulk = 4.0 × 10 –3使用 LLTO 单晶证明了 300 K 时的 S/cm，大约是 LLTO 多晶的三到四倍，并检查了它们对晶畴取向的依赖性。在大约 260 K 时观察到先前由于随机晶体取向而被掩盖的活化能变化。此外，电子显微镜分析表明，LLTO 的离子电导率保持较高，因为具有最高离子电导率的区域倾斜远离理想的传导方向。本文报道的结果提供了 LLTO 中最高的电导率以及对其晶体结构的重要见解，从而在新型氧化物电解质设计中实现了更高的电导率。
更新日期：2022-06-13
中文翻译：
钛酸镧锂单晶：锂离子电导率对晶畴取向的依赖性
钛酸镧锂 La 2/3- x Li 3 x TiO 3 (LLTO) 具有在氧化物基电解质中表现出最高的锂离子电导率的潜力，因为其晶体结构可实现快速的锂离子扩散。在此，体锂离子电导率高达 σ bulk = 4.0 × 10 –3使用 LLTO 单晶证明了 300 K 时的 S/cm，大约是 LLTO 多晶的三到四倍，并检查了它们对晶畴取向的依赖性。在大约 260 K 时观察到先前由于随机晶体取向而被掩盖的活化能变化。此外，电子显微镜分析表明，LLTO 的离子电导率保持较高，因为具有最高离子电导率的区域倾斜远离理想的传导方向。本文报道的结果提供了 LLTO 中最高的电导率以及对其晶体结构的重要见解，从而在新型氧化物电解质设计中实现了更高的电导率。
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