Understanding the Mesoscale Degradation in Nickel-Rich Cathode Materials through Machine-Learning-Revealed Strain-Redox Decoupling

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

23 Scopus Citations
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Author(s)

  • Guannan Qian
  • Jin Zhang
  • Sheng-Qi Chu
  • Kai Zhang
  • Qingxi Yuan
  • Zi-Feng Ma
  • Piero Pianetta
  • Linsen Li
  • Keeyoung Jung
  • Yijin Liu

Detail(s)

Original languageEnglish
Pages (from-to)687-693
Journal / PublicationACS Energy Letters
Volume6
Issue number2
Online published27 Jan 2021
Publication statusPublished - 12 Feb 2021
Externally publishedYes

Abstract

The degradation of nickel-rich cathode materials for lithium-ion batteries upon prolonged electrochemical cycling features a complicated interplay among electronic structure, lattice configuration, and micro-morphology. The underlying mechanism for such an entanglement of different material properties at nano- to mesoscales is fundamental to the battery performance but not well-understood yet. Here we investigate the correlation between the local redox reaction and lattice mismatch through a nano-resolution synchrotron spectro-microscopy study of LiNi0.8Co0.1Mn0.1O2 (NCM 811) cathode particles. With assistance from a machine-learning-based data classification method, we identify local regions that demonstrate a strain-redox decoupling effect, which can be attributed to different side reactions. Our results highlight the mesoscale reaction heterogeneity in the battery cathode and suggest that particle structure engineering could be a viable approach to mitigate the chemomechanical degradation of cathode materials.

Research Area(s)

  • Data Science

Citation Format(s)

Understanding the Mesoscale Degradation in Nickel-Rich Cathode Materials through Machine-Learning-Revealed Strain-Redox Decoupling. / Qian, Guannan; Zhang, Jin; Chu, Sheng-Qi et al.

In: ACS Energy Letters, Vol. 6, No. 2, 12.02.2021, p. 687-693.

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