掺杂剂
扫描透射电子显微镜
材料科学
锂(药物)
阴极
兴奋剂
镍
透射电子显微镜
无机化学
纳米技术
化学
物理化学
冶金
光电子学
医学
内分泌学
作者
Soyeon Kim,Yifan Yang,Eun Gyu Lee,M.-S. Kim,Kyoung‐June Go,Minseuk Kim,Gi‐Yeop Kim,Sora Lee,Chiho Jo,Sungho Choi,Si‐Young Choi
标识
DOI:10.1016/j.cej.2024.148869
摘要
Improving the structural stability of high-capacity high-Ni cathodes through doping has been investigated, but the structural stabilization mechanisms of dopants remain unclear. This study focused on unraveling the influence of individual dopants, Aluminium, Titanium, or Zirconium, on the structural stabilization of high-Ni cathodes. X-ray Diffraction and High-Angle Annular Dark-Field Scanning Transmission Electron Microscopy (HAADF-STEM) were employed for quantitative analysis of cation mixing, and for the first time, HAADF-STEM and deep learning were combined to improve the accuracy and efficiency of the analysis. The atomic-scale EDS analysis identified transition metal sites as the primary doping sites in doped high-Ni cathodes. DFT calculations revealed that dopants enhance the interatomic bonds between Ni and O, thereby inhibiting cation mixing. Among the studied dopants, Ti was found to have the most substantial influence in enhancing structural stability. This study contributes to an understanding of single dopant on the structural stability of high-Ni cathodes, aiding the design of next-generation lithium-ion batteries.
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