Regulating the Electron Distribution of Metal-Oxygen for Enhanced Oxygen Stability in Li-rich Layered Cathodes

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Dong Luo
  • Yi-Ying Chin
  • Chien-Te Chen
  • Huaican Chen
  • Wen Yin
  • Tianyi Li
  • Kamila M. Wiaderek
  • Qingyu Kong
  • Jun Fan
  • He Zhu
  • Yang Ren
  • Qi Liu

Detail(s)

Original languageEnglish
Article number2307397
Journal / PublicationAdvanced Science
Volume11
Issue number24
Online published22 Apr 2024
Publication statusPublished - 26 Jun 2024

Link(s)

Abstract

Li-rich Mn-based layered oxides (LLO) hold great promise as cathode materials for lithium-ion batteries (LIBs) due to their unique oxygen redox (OR) chemistry, which enables additional capacity. However, the LLOs face challenges related to the instability of their OR process due to the weak transition metal (TM)-oxygen bond, leading to oxygen loss and irreversible phase transition that results in severe capacity and voltage decay. Herein, a synergistic electronic regulation strategy of surface and interior structures to enhance oxygen stability is proposed. In the interior of the materials, the local electrons around TM and O atoms may be delocalized by surrounding Mo atoms, facilitating the formation of stronger TM─O bonds at high voltages. Besides, on the surface, the highly reactive O atoms with lone pairs of electrons are passivated by additional TM atoms, which provides a more stable TM─O framework. Hence, this strategy stabilizes the oxygen and hinders TM migration, which enhances the reversibility in structural evolution, leading to increased capacity and voltage retention. This work presents an efficient approach to enhance the performance of LLOs through surface-to-interior electronic structure modulation, while also contributing to a deeper understanding of their redox reaction. © 2024 The Authors. Advanced Science published by Wiley-VCH GmbH.

Research Area(s)

  • delocalized electrons, electronic modulation, in situ characterization, lithium-rich oxide cathodes, oxygen stability

Citation Format(s)

Regulating the Electron Distribution of Metal-Oxygen for Enhanced Oxygen Stability in Li-rich Layered Cathodes. / Yin, Zijia; Zhao, Jun; Luo, Dong et al.
In: Advanced Science, Vol. 11, No. 24, 2307397, 26.06.2024.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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