阴极
材料科学
化学物理
比例(比率)
离子
动力学(音乐)
纳米技术
工程物理
统计物理学
化学
物理
地理
物理化学
地图学
声学
量子力学
作者
Dong Hou,Jue Liu,Zhengrui Xu,Zhijie Yang,Xianghui Xiao,Feng Lin
出处
期刊:Matter
[Elsevier]
日期:2024-02-01
卷期号:7 (2): 640-654
标识
DOI:10.1016/j.matt.2023.11.025
摘要
Summary
A long pursuit in developing high-energy batteries is the prognosis and improvement of thermal stability. Here, we report new understandings of the thermo-chemical transformation mechanism of delithiated Ni-rich cathodes at different spatial length scales. Using in situ neutron scattering and pair distribution function analyses, we identify that thermal degradation can be recognized as a topotactic transformation of the oxygen octahedral at angstrom scale. We highlight the importance of building a robust oxygen framework at short range to achieve higher thermal stability. Our in situ spectroscopic nano-tomography resolves the dynamic thermo-chemical interactions inside delithiated particles, illustrating the correlation between thermal performance and spatial distribution of various thermo-chemical interactions. Statistical analyses of thermally active and sluggish regions in cathode particles show that these minority regions (<2% volume fraction) govern thermal stability. We propose effective strategies to manipulate thermo-chemical interaction dynamics and to minimize the propagation of thermally active regions by "flattening the curve."
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