Nanoscale domain imaging of Li-rich disordered rocksalt-type cathode materials with X-ray spectroscopic ptychography
Nanoscale domain imaging of Li-rich disordered rocksalt-type cathode materials with X-ray spectroscopic ptychography
复制标题
利用 X 射线光谱叠层成像技术对富锂无序岩盐型正极材料进行纳米域成像
DOI：
10.1039/d2cp04087e
复制
发表时间：
2023
影响因子：
3.3
通讯作者：
Takahashi Yukio
中科院分区：
文献类型：
--
作者：
Uematsu Hideshi;Ishiguro Nozomu;Abe Masaki;Takazawa Shuntaro;Kang Jungmin;Konuma Itsuki;Yabuuchi Naoaki;Takahashi Yukio
富锂无序岩盐型正极材料在高容量、高功率锂离子电池中具有广阔的应用前景。它们中的许多是通过机械研磨合成的，并且可能在纳米级具有异质结构和化学状态。在这项研究中，我们进行了X射线光谱ptychography测量的富锂无序岩盐型氧化物颗粒的机械研磨合成的脱锂反应之前和之后的钒K吸收边，并可视化其结构和化学状态的空间分辨率为100 nm。我们通过聚类分析将具有不同化学状态的多个域分类。脱锂反应前后颗粒的畴分布趋势的比较揭示了畴的存在，表明脱锂反应被抑制。
Lithium-rich disordered rocksalt-type cathode materials are promising for high-capacity and high-power lithium-ion batteries. Many of them are synthesized by mechanical milling and may have heterogeneous structures and chemical states at the nanoscale. In this study, we performed X-ray spectroscopic ptychography measurements of Li-rich disordered rocksalt-type oxide particles synthesized by mechanical milling before and after delithiation reaction at the vanadium K absorption edge, and visualized their structures and chemical state with a spatial resolution of ∼100 nm. We classified multiple domains with different chemical states via clustering analysis. A comparison of the domain distribution trends of the particles before and after the delithiation reaction revealed the presence of domains, suggesting that the delithiation reaction was suppressed.