Approaching the capacity limit of lithium cobalt oxide in lithium ion batteries via lanthanum and aluminium doping

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

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Author(s)

  • Xin Su
  • Dan Lei
  • Yan Qin
  • Jianguo Wen
  • Fangmin Guo
  • Yimin A. Wu
  • Yangchun Rong
  • Ronghui Kou
  • Xianghui Xiao
  • Frederic Aguesse
  • Javier Bareño
  • Yang Ren
  • Wenquan Lu
  • Yangxing Li

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)936–943
Journal / PublicationNature Energy
Volume3
Issue number11
Online published11 Jun 2018
Publication statusPublished - Nov 2018

Abstract

Lithium cobalt oxides (LiCoO2) possess a high theoretical specific capacity of 274 mAh g–1. However, cycling LiCoO2-based batteries to voltages greater than 4.35 V versus Li/Li+ causes significant structural instability and severe capacity fade. Consequently, commercial LiCoO2 exhibits a maximum capacity of only ~165 mAh g–1. Here, we develop a doping technique to tackle this long-standing issue of instability and thus increase the capacity of LiCoO2. La and Al are concurrently doped into Co-containing precursors, followed by high-temperature calcination with lithium carbonate. The dopants are found to reside in the crystal lattice of LiCoO2, where La works as a pillar to increase the c axis distance and Al as a positively charged centre, facilitating Li+ diffusion, stabilizing the structure and suppressing the phase transition during cycling, even at a high cut-off voltage of 4.5 V. This doped LiCoO2 displays an exceptionally high capacity of 190 mAh g–1, cyclability with 96% capacity retention over 50 cycles and significantly enhanced rate capability.

Research Area(s)

  • Batteries, energy storage

Citation Format(s)

Approaching the capacity limit of lithium cobalt oxide in lithium ion batteries via lanthanum and aluminium doping. / Liu, Qi; Su, Xin; Lei, Dan; Qin, Yan; Wen, Jianguo; Guo, Fangmin; Wu, Yimin A.; Rong, Yangchun; Kou, Ronghui; Xiao, Xianghui; Aguesse, Frederic; Bareño, Javier; Ren, Yang; Lu, Wenquan; Li, Yangxing.

In: Nature Energy, Vol. 3, No. 11, 11.2018, p. 936–943.

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