Lithium Deficiencies Engineering in Li-Rich Layered Oxide Li1.098Mn0.533Ni0.113Co0.138O2 for High-Stability Cathode

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

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Author(s)

  • Pengfei Liu
  • Hong Zhang
  • Wei He
  • Yong Cheng
  • Qingshui Xie
  • Yating Ma
  • Hongfei Zheng
  • Laisen Wang
  • Zi-Zhong Zhu
  • Yong Peng
  • Liqiang Mai
  • Dong-Liang Peng

Detail(s)

Original languageEnglish
Pages (from-to)10876–10882
Number of pages7
Journal / PublicationJournal of the American Chemical Society
Volume141
Issue number27
Online published15 Jun 2019
Publication statusPublished - 10 Jul 2019
Externally publishedYes

Abstract

Li-rich layered oxides have been in focus because of their high specific capacity. However, they usually suffer from poor kinetics, severe voltage decay, and capacity fading. Herein, a long-neglected Li-deficient method is demonstrated to address these problems by simply reducing the lithium content. Appropriate lithium vacancies can improve dynamics features and induce in situ surface spinel coating and nickel doping in the bulk. Therefore, the elaborately designed Li1.098Mn0.533Ni0.113Co0.138O2 cathode possesses improved initial Coulombic efficiency, excellent rate capability, largely suppressed voltage decay, and outstanding long-term cycling stability. Specifically, it shows a superior capacity retention of 93.1% after 500 cycles at 1 C (250 mA g–1) with respect to the initial discharge capacity (193.9 mA h g–1), and the average voltage still exceeds 3.1 V. In addition, the discharge capacity at 10 C can be as high as 132.9 mA h g–1. More importantly, a Li-deficient cathode can also serve as a prototype for further performance enhancement, as there are plenty of vacancies.

Citation Format(s)

Lithium Deficiencies Engineering in Li-Rich Layered Oxide Li1.098Mn0.533Ni0.113Co0.138O2 for High-Stability Cathode. / Liu, Pengfei; Zhang, Hong; He, Wei et al.

In: Journal of the American Chemical Society, Vol. 141, No. 27, 10.07.2019, p. 10876–10882.

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