Structural investigations of migration pathways in lithium ion-conducting La2/3?xLi3xTiO3 perovskites |
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| Institution: | 1. Department of Chemistry, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan;2. Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan;3. Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan;4. Institute for Materials Reserach, Tohoku Univesity, 2-1-1 Katahira, Aoba-ku, 980-8577 Sendai, Japan;1. School of Metallurgy, Northeastern University, Shenyang 110819, PR China;2. Liaoning Key Laboratory for Metallurgical Sensor and Technology, Shenyang 110819, PR China;1. Department of Materials Science and Engineering, Chonnam National University, 77, Yongbongro, Bukgu, Gwangju 61186, South Korea;2. School of Chemical Engineering, Hanoi University of Science and Technology, 1st Dai Co Viet, Hai Ba Trung, Hanoi, Vietnam;1. Institute for Applied Materials – Materials for Electrical and Electronic Engineering (IAM-WET), Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany;2. Bosch Engineering GmbH, Robert-Bosch-Allee 1, D-74232 Abstatt, Germany;1. Centro NanoMat/Cryssmat Lab/Física – DETEMA, Facultad de Química, Universidad de la República, Uruguay;2. Centro Interdisciplinario de Nanotecnología, Química y Física de Materiales, Espacio Interdisciplinario, Universidad de la República, Uruguay;1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 30 South Puzhu Road, Nanjing, 211816, China;2. Jiangsu FREY New Energy CO., LTD, Xuzhou National High-tech Development Zone, Xuzhou, 221100, China;3. WA School of Mines: Minerals, Energy and Chemical Engineering (WASM-MECE), Curtin University, Perth, WA 6845, Australia |
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| Abstract: | The average structure and microstructure of a lithium-ion conducting perovskite La2/3?xLi3xTiO3 (x = 0.12) were investigated using neutron diffraction and transmission electron microscopy (TEM). The obtained results were compared with those of previous studies on La2/3?xLi3xTiO3 series compounds, and the relationship between their structures and ionic conduction was discussed. The Rietveld refinement using neutron diffraction data reveals that the average structure (space group: Cmmm) of furnace-cooled Li-rich La2/3?xLi3xTiO3 (x = 0.12) involves alternative ordered arrangement of La along the c-axis and anti-phase-tilt of TiO6 octahedra along the b-axis as with Li-poor La2/3?xLi3xTiO3(x = 0.05). It was found that the strong correlation between structure and percolative diffusion pathways in the perovskites is primarily referred to the ordered arrangement of La ions, and the “bottleneck” square—surrounded by four oxygen ions determined by the distortion and tilt of TiO6 octahedra. In addition, the 90°-oriented micro-domain structure, which also influences the percolative diffusion pathways in La2/3?xLi3xTiO3, was observed by TEM. |
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