Modifying Li@Mn6 Superstructure Units by Al Substitution to Enhance the Long-Cycle Performance of Co-Free Li-Rich Cathode

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

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Author(s)

  • Zhibo Li
  • Yiwei Li
  • Mingjian Zhang
  • Zu-Wei Yin
  • Liang Yin
  • Shenyang Xu
  • Changjian Zuo
  • Rui Qi
  • Haoyu Xue
  • Jiangtao Hu
  • Bo Cao
  • Mihai Chu
  • Wenguang Zhao
  • Lin Xie
  • Guoxi Ren
  • Feng Pan

Detail(s)

Original languageEnglish
Article number2101962
Journal / PublicationAdvanced Energy Materials
Volume11
Issue number37
Online published18 Aug 2021
Publication statusPublished - 7 Oct 2021
Externally publishedYes

Abstract

As one of the most promising cathodes for Li-ion batteries, Li-rich layered oxides suffer from low Coulombic efficiency, severe capacity fading, and voltage decay, which are related to the aggregated Li@Mn6 superstructure units. Herein, a Co-free Li-rich oxide Li[Li1/4Mn1/2Ni1/6Al1/12]O2 through Al substitution of Co in Li[Li1/4Mn1/2Ni1/6Co1/12]O2, is designed. Combining the average structural refinement with the detailed local structural/chemical analysis, it is found that the introduced Al ions occupy the Mn sites in Li@Mn6 superstructure units, which further induces the partial replacement of the central Li ions in Li@Mn6 units by Ni2+. The modified superstructure units stabilize the anionic framework and suppress structural degradation during long-term cycling. A superior cyclability (a capacity retention of 91.4% after 500 cycles at 1 C) is achieved. This work not only deepens the understanding into the mechanism of Al substitution, but also provides a novel route to design high-performance Li-rich cathodes by modifying the local functional units.

Research Area(s)

  • Al substitution, Co-free Li-rich cathodes, Li-ion batteries, Li, Mn 6 superstructure units, local structural modification

Citation Format(s)

Modifying Li@Mn6 Superstructure Units by Al Substitution to Enhance the Long-Cycle Performance of Co-Free Li-Rich Cathode. / Li, Zhibo; Li, Yiwei; Zhang, Mingjian; Yin, Zu-Wei; Yin, Liang; Xu, Shenyang; Zuo, Changjian; Qi, Rui; Xue, Haoyu; Hu, Jiangtao; Cao, Bo; Chu, Mihai; Zhao, Wenguang; Ren, Yang; Xie, Lin; Ren, Guoxi; Pan, Feng.

In: Advanced Energy Materials, Vol. 11, No. 37, 2101962, 07.10.2021.

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