过渡金属
锂(药物)
阴极
氧化物
混合(物理)
材料科学
金属
无机化学
分辨率(逻辑)
化学物理
化学
物理化学
冶金
物理
有机化学
催化作用
医学
人工智能
内分泌学
量子力学
计算机科学
作者
Pengfei Yan,Jianming Zheng,Dongping Lv,Yi Wei,Jiaxin Zheng,Zhiguo Wang,Saravanan Kuppan,Jianguo Yu,Langli Luo,Danny J. Edwards,Matthew J. Olszta,Khalil Amine,Jun Li,Jie Xiao,Feng Pan,Guoying Chen,Ji-Guang Zhang,Chong M. Wang
标识
DOI:10.1021/acs.chemmater.5b02016
摘要
Capacity and voltage fading of layered structured cathode based on lithium transition-metal oxide is closely related to the lattice position and migration behavior of the transition-metal ions. However, it is scarcely clear about the behavior of each of these transition-metal ions in this category of cathode material. We report direct atomic resolution visualization of interatomic layer mixing of transition metals (Ni, Co, Mn) and lithium ions in layered structured oxide cathodes for lithium-ion batteries. Using chemical imaging with an aberration-corrected scanning transmission electron microscope (STEM) and density function theory calculations, we discovered that, in the layered cathodes, Mn and Co tend to reside almost exclusively at the lattice site of transition-metal (TM) layer in the structure or little interlayer mixing with Li. In contrast, Ni shows a high degree of interlayer mixing with Li. The fraction of Ni ions resides in the Li layer followed by a near linear dependence on total Ni concentr...
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