Iijima Sumio, Ohnishi Ichiro, Liu Zheng
Meijo University, Graduate School of Science and Technology, Nagoya, 468-8502, Japan.
JEOL Ltd., 3-1-2 Musashino, Akishima, Tokyo, 196-8558, Japan.
Sci Rep. 2021 Sep 9;11(1):18022. doi: 10.1038/s41598-021-97244-0.
Ternary metal oxide compounds, such as Ti-Nb and Nb-W oxides, have renewed research interest in energy storage materials because these oxides contain multivalent metal ions that may be able to control the ion transport in solid lithium batteries. One of these oxides is TiNbO, which is composed of metal-oxygen octahedra connected through corner-sharing and edge-sharing to form "block structures". In the early 1970s Von Dreele and Cheetham proposed a metal-atoms ordering in this oxide crystal using Rietveld refined neutron powder diffraction method. Most recent studies on these oxides, however, have not considered cation ordering in evaluating the battery electrode materials. In this paper, by utilizing the latest scanning transmission electron microscopy combined with energy dispersive X-ray spectroscopy imaging technology, the cation chemical ordering in those oxide crystals was directly revealed at atomic resolution.
三元金属氧化物化合物，如钛铌氧化物和铌钨氧化物，重新激发了人们对储能材料的研究兴趣，因为这些氧化物含有多价金属离子，可能能够控制固态锂电池中的离子传输。其中一种氧化物是TiNbO，它由通过角共享和边共享连接的金属氧八面体组成，形成“块状结构”。20世纪70年代初，冯·德里尔（Von Dreele）和奇塔姆（Cheetham）使用Rietveld精修中子粉末衍射法提出了这种氧化物晶体中的金属原子有序排列。然而，最近对这些氧化物的研究在评估电池电极材料时并未考虑阳离子有序排列。在本文中，通过利用最新的扫描透射电子显微镜结合能量色散X射线光谱成像技术，在原子分辨率下直接揭示了这些氧化物晶体中的阳离子化学有序排列。
