材料科学
镧
钛酸锂
离子
电解质
锂(药物)
扩散
无机化学
钛酸酯
固态
原子扩散
结晶学
锂离子电池
化学
物理化学
复合材料
电池(电)
陶瓷
有机化学
功率(物理)
内分泌学
物理
热力学
医学
量子力学
电极
作者
Lifeng Zhang,Lei Xu,Yao Nian,Weizhen Wang,You Han,Langli Luo
出处
期刊:ACS Nano
[American Chemical Society]
日期:2022-04-11
卷期号:16 (4): 6898-6905
被引量:9
标识
DOI:10.1021/acsnano.2c02250
摘要
Lithium lanthanum titanium oxide (LLTO) as a fast Li-ion conductor is a promising candidate for future all-solid-state Li batteries. Fundamental understanding of the microstructure of LLTO and its effect on the Li+ diffusion mechanism, especially across different length scales and interfaces, is a prerequisite to improving the material design and processing development of oxide-based solid electrolytes. Herein, through detailed structural analysis of LLTO ceramic pellets by aberration-corrected transmission electron microscopy, we discovered previously unreported intrinsic planar defects in LLTO single-crystal grains. These planar defects feature an antiphase boundary along specific crystal planes with a "rock-salt" structure enriched by Li within a few atomic layers. Corroborated by density-functional-theory-based calculations, we show an increased diffusion barrier across these planar defects inevitably lowers the bulk Li+ diffusivity of the oxide electrolyte.
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