期刊
INORGANIC CHEMISTRY FRONTIERS
卷 8, 期 1, 页码 127-140出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0qi01021a
关键词
-
资金
- Basic Research Project of the Science and Technology Innovation Commission of Shenzhen [JCYJ20170412153139454]
- National Natural Science Foundation of China [21875097]
- Natural Science Foundation of Guangdong Province [2018A030313725, 2018B030322001]
- Professorial and Doctoral Scientific Research Foundation of Huizhou University [2020JB025]
- BSRF
Through the investigation with in situ Raman spectroscopy, XANES spectroscopy, and HRTEM, it was found that the voltage-fading mechanism of Li-rich materials is nearly reversible in the whole charge-discharge cycle but becomes irreversible upon long-term cycling, leading to structural collapse and undesirable voltage fading. This finding is significant for a better understanding of the redox reaction mechanisms of high-capacity Li-rich cathodes.
Lithium-rich layered oxide cathodes have an advantage of high energy density. However, continuous capacity fading and voltage hysteresis have largely restricted their practical application. In this work, we investigated in depth the voltage-fading mechanism of Li-rich materials by in situ Raman spectroscopy, X-ray absorption near edge structure (XANES) spectroscopy, and high-resolution transmission electron microscopy (HRTEM). It has been found that the chemical and structural evolution of a Li1.2Ni0.15Co0.1Mn0.55O2 cathode is quasi-reversible in a whole charge-discharge cycle. The structural evolution is evidently irreversible upon long-term cycling, resulting in the dissolution of cations from the lattices and structural collapse, which in turn leads to undesirable voltage fading. This finding is important for a better understanding of the redox reaction mechanisms of high-capacity Li-rich cathodes.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据