Modulating the Surface Ligand Orientation for Stabilized Anionic Redox in Li-Rich Oxide Cathodes

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

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Author(s)

  • Yanchen Liu
  • He Zhu
  • Yizhou Zhu
  • Shuming Dou
  • Jie Xu
  • Cheng-Jun Sun
  • Yida Deng
  • Qunhui Yuan
  • Xingjun Liu
  • Junwei Wu
  • Yanan Chen
  • Qi Liu

Detail(s)

Original languageEnglish
Article number2003479
Journal / PublicationAdvanced Energy Materials
Volume11
Issue number13
Online published3 Mar 2021
Publication statusPublished - 8 Apr 2021

Abstract

Anionic redox chemistry is emerging as a key concept in the development of high-energy lithium-ion batteries, as it enables a nearly doubled charge storage capacity, aiding the development of high-capacity batteries. However, the anionic reactivity is frequently irreversible from charge to discharge, leading to rapid decay of the capacity and voltage of batteries over long-term cycling. Although the possibility of controlling the anionic redox reactions by tuning the geometric and electronic structures has recently been proposed, the implementation of this strategy is still a critical challenge. Herein, a strategy is proposed to improve the anionic redox reversibility of a model anionic redox active cathode material, Li1.2Ni0.13Co0.13Mn0.54O2, by tuning the surface ligand geometry via the growth of a lattice-compatible spinel LiCoO2 coating layer on the particle surface. Detailed local structure and first principles investigations reveal that the shape and orientation of the octahedral layer in the host lattice are modified. Accordingly, a two-band oxygen redox behavior is triggered in the ligand-orientation-regulated Li-rich cathode, leading to enhanced reversibility, and thus, remarkably improved capacity and voltage retention over cycling. This study highlights the importance of controllable ligand orientation, carving a new path for the development and design of Li-rich cathodes in the future.

Research Area(s)

  • cathode materials, controllable ligand orientation, Li-rich layered oxides, lithium ion batteries, surface modification

Citation Format(s)

Modulating the Surface Ligand Orientation for Stabilized Anionic Redox in Li-Rich Oxide Cathodes. / Liu, Yanchen; Zhu, He; Zhu, Hekang; Ren, Yang; Zhu, Yizhou; Huang, Yalan; Dai, Liang; Dou, Shuming; Xu, Jie; Sun, Cheng-Jun; Wang, Xun-Li; Deng, Yida; Yuan, Qunhui; Liu, Xingjun; Wu, Junwei; Chen, Yanan; Liu, Qi.

In: Advanced Energy Materials, Vol. 11, No. 13, 2003479, 08.04.2021.

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