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 › peer-review
Author(s)
Related Research Unit(s)
Detail(s)
Original language | English |
---|---|
Pages (from-to) | 936–943 |
Journal / Publication | Nature Energy |
Volume | 3 |
Issue number | 11 |
Online published | 11 Jun 2018 |
Publication status | Published - Nov 2018 |
Link(s)
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 › peer-review