化学
阴极
透射电子显微镜
纳米孔
化学物理
氧化物
纳米技术
热分解
热稳定性
化学工程
材料科学
物理化学
工程类
有机化学
作者
Hyeokjun Park,Hayoung Park,Kyung Song,Seok Hyun Song,Sungsu Kang,Kun‐Hee Ko,Donggun Eum,Yonggoon Jeon,Jihoon Kim,Won Mo Seong,Hyungsub Kim,Jungwon Park,Kisuk Kang
出处
期刊:Nature Chemistry
[Springer Nature]
日期:2022-04-21
卷期号:14 (6): 614-622
被引量:77
标识
DOI:10.1038/s41557-022-00915-2
摘要
Nickel-rich layered oxides are envisaged as key near-future cathode materials for high-energy lithium-ion batteries. However, their practical application has been hindered by their inferior cycle stability, which originates from chemo-mechanical failures. Here we probe the solid-state synthesis of LiNi0.6Co0.2Mn0.2O2 in real time to better understand the structural and/or morphological changes during phase evolution. Multi-length-scale observations-using aberration-corrected transmission electron microscopy, in situ heating transmission electron microscopy and in situ X-ray diffraction-reveal that the overall synthesis is governed by the kinetic competition between the intrinsic thermal decomposition of the precursor at the core and the topotactic lithiation near the interface, which results in spatially heterogeneous intermediates. The thermal decomposition leads to the formation of intergranular voids and intragranular nanopores that are detrimental to cycling stability. Furthermore, we demonstrate that promoting topotactic lithiation during synthesis can mitigate the generation of defective structures and effectively suppress the chemo-mechanical failures.
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