Long-Range Cationic Disordering Induces two Distinct Degradation Pathways in Co-Free Ni-Rich Layered Cathodes

Weibo Hua*, Jilu Zhang, Suning Wang, Yi Cheng, Hang Li, Jochi Tseng, Zhonghua Wu, Chong Heng Shen, Oleksandr Dolotko, Hao Liu, Sung Fu Hung, Wei Tang*, Mingtao Li, Michael Knapp, Helmut Ehrenberg, Sylvio Indris*, Xiaodong Guo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

Ni-rich layered oxides are one of the most attractive cathode materials in high-energy-density lithium-ion batteries, their degradation mechanisms are still not completely elucidated. Herein, we report a strong dependence of degradation pathways on the long-range cationic disordering of Co-free Ni-rich Li1−m(Ni0.94Al0.06)1+mO2 (NA). Interestingly, a disordered layered phase with lattice mismatch can be easily formed in the near-surface region of NA particles with very low cation disorder (NA-LCD, m≤0.06) over electrochemical cycling, while the layered structure is basically maintained in the core of particles forming a “core–shell” structure. Such surface reconstruction triggers a rapid capacity decay during the first 100 cycles between 2.7 and 4.3 V at 1 C or 3 C. On the contrary, the local lattice distortions are gradually accumulated throughout the whole NA particles with higher degrees of cation disorder (NA-HCD, 0.06≤m≤0.15) that lead to a slow capacity decay upon cycling.

Original languageEnglish
JournalAngewandte Chemie - International Edition
DOIs
StateAccepted/In press - 2022

Keywords

  • Cationic Disordering
  • Degradation Pathways
  • Lattice Distortion
  • Ni-Rich Cathodes
  • Surface Reconstruction

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