Insights into the chemical and structural evolution of Li-rich layered oxide cathode materials

Zhi Liang Wu, Hanjie Xie, Yingzhi Li, Fangchang Zhang, Zhenyu Wang, Wei Zheng, Mingyang Yang, Yulin Cao, Zhouguang Lu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)127-140
Number of pages14
JournalInorganic Chemistry Frontiers
Volume8
Issue number1
DOIs
StatePublished - 7 Jan 2021
Externally publishedYes

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