Visualization of Structural Heterogeneities in Particles of Lithium Nickel Manganese Oxide Cathode Materials by Ptychographic X-ray Absorption Fine Structure
Visualization of Structural Heterogeneities in Particles of Lithium Nickel Manganese Oxide Cathode Materials by Ptychographic X-ray Absorption Fine Structure
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通过叠层X射线吸收精细结构可视化锂镍锰氧化物正极材料颗粒的结构异质性
DOI：
10.1021/acs.jpclett.1c01445
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Takahashi Yukio
中科院分区：
文献类型：
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作者：
Uematsu Hideshi;Ishiguro Nozomu;Abe Masaki;Takazawa Shuntaro;Kang Jungmin;Hosono Eiji;Nguyen Nguyen Duong;Dam Hieu Chi;Okubo Masashi;Takahashi Yukio
尖晶石型锂镍锰氧化物（LNMOs）的非均匀相/结构分布是提高锂离子电池正极材料性能和稳定性的关键。在此，我们报告了使用二维平面x射线吸收精细结构（XAFS）来可视化制备的LNMO颗粒中锰和镍的密度和价态图，以及根据不同元素组成和化学状态对三相组进行无监督学习的方法。所描述的方法可以增加纳米级表征的信息供应，并促进合适结构域的设计，以最大限度地提高电池的性能和稳定性。
A heterogeneous phase/structure distribution in the bulk of spinel lithium nickel manganese oxides (LNMOs) is the key to maximizing the performance and stability of the cathode materials of lithium-ion batteries. Herein, we report the use of two-dimensional ptychographic X-ray absorption fine structure (XAFS) to visualize the density and valence maps of manganese and nickel in as-prepared LNMO particles and unsupervised learning to classify the three-phase group in terms of different elemental compositions and chemical states. The described approach may increase the supply of information for nanoscale characterization and promote the design of suitable structural domains to maximize the performance and stability of batteries.