Correlation between long range and local structural changes in Ni-rich layered materials during charge and discharge process

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Shiyao Zheng
  • Chaoyu Hong
  • Xiaoyun Guan
  • Yuxuan Xiang
  • Xiangsi Liu
  • Gui-Liang Xu
  • Rui Liu
  • Guiming Zhong
  • Feng Zheng
  • Yixiao Li
  • Xiaoyi Zhang
  • Zonghai Chen
  • Khalil Amine
  • Yong Yang

Detail(s)

Original languageEnglish
Pages (from-to)336-343
Journal / PublicationJournal of Power Sources
Volume412
Publication statusPublished - 1 Feb 2019
Externally publishedYes

Abstract

Ni-rich cathode materials can deliver higher energy density with a lower cost compared with other conventional layered oxide materials. However, the cycling performance of Ni-rich materials needs further improvement, and the irreversible phase transformation related to the cell failure is not fully understood yet. Although an H1–H2–H3 structural change process is revealed, a more specific explanation about the difference of these hexagonal phases is needed for deeper comprehension and further targeted modification of Ni-rich materials. In this work, the different phase transformation mechanisms of LiNi0.6Co0.2Mn0.2O2 (NCM622) and LiNi0.8Co0.1Mn0.1O2 (NCM811) are investigated by C X-ray diffraction (XRD) measurement, and the relationship between structural change and capacity degradation is discussed, showing that H3 phase can be harmful for cycling. In addition, 6Li solid state nuclear magnetic resonance (ss-NMR) experiments are carried out for detecting the Li chemical environment at different state of charge, and the data can be associated with structural change obtained from in operando XRD results. From the analysis mentioned above, a new explanation of H1/H2/H3 is given, and a relationship between long range and local structural change has been put forward for the first time.

Research Area(s)

  • In operando XRD, Li local environment, Ni-rich materials, Solid-state NMR, Structural change

Bibliographic Note

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Citation Format(s)

Correlation between long range and local structural changes in Ni-rich layered materials during charge and discharge process. / Zheng, Shiyao; Hong, Chaoyu; Guan, Xiaoyun; Xiang, Yuxuan; Liu, Xiangsi; Xu, Gui-Liang; Liu, Rui; Zhong, Guiming; Zheng, Feng; Li, Yixiao; Zhang, Xiaoyi; Ren, Yang; Chen, Zonghai; Amine, Khalil; Yang, Yong.

In: Journal of Power Sources, Vol. 412, 01.02.2019, p. 336-343.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review