Anomalous metal segregation in lithium-rich material provides design rules for stable cathode in lithium-ion battery

Ruoqian Lin, Enyuan Hu, Mingjie Liu, Yi Wang, Hao Cheng, Jinpeng Wu, Jin Cheng Zheng, Qin Wu, Seongmin Bak, Xiao Tong, Rui Zhang, Wanli Yang, Kristin A. Persson, Xiqian Yu, Xiao Qing Yang, Huolin L. Xin

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)

Abstract

Despite the importance of studying the instability of delithiated cathode materials, it remains difficult to underpin the degradation mechanism of lithium-rich cathode materials due to the complication of combined chemical and structural evolutions. Herein, we use state-of-the-art electron microscopy tools, in conjunction with synchrotron X-ray techniques and first-principle calculations to study a 4d-element-containing compound, Li2Ru0.5Mn0.5O3. We find surprisingly, after cycling, ruthenium segregates out as metallic nanoclusters on the reconstructed surface. Our calculations show that the unexpected ruthenium metal segregation is due to its thermodynamic insolubility in the oxygen deprived surface. This insolubility can disrupt the reconstructed surface, which explains the formation of a porous structure in this material. This work reveals the importance of studying the thermodynamic stability of the reconstructed film on the cathode materials and offers a theoretical guidance for choosing manganese substituting elements in lithium-rich as well as stoichiometric layer-layer compounds for stabilizing the cathode surface.

Original languageEnglish
Article number1650
JournalNature communications
Volume10
Issue number1
DOIs
Publication statusPublished - 2019 Dec 1

Bibliographical note

Publisher Copyright:
© 2019, The Author(s).

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Biochemistry,Genetics and Molecular Biology
  • General Physics and Astronomy

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