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Ti-Gradient Doping to Stabilize Layered Surface Structure for High Performance High-Ni Oxide Cathode of Li-Ion Battery
Kong, Defei; Hu, Jiangtao; Chen, Zhefeng; Song, Kepeng; Li, Cheng; Weng, Mouyi; Li, Maofan; Wang, Rui; Liu, Tongchao; Liu, Jiajie; Zhang, Mingjian; Xiao, Yinguo; Pan, Feng
2019-11-01
Source PublicationADVANCED ENERGY MATERIALS
ISSN1614-6832
Volume9Issue:41
AbstractHigh-Ni layered oxide cathodes are considered to be one of the most promising cathodes for high-energy-density lithium-ion batteries due to their high capacity and low cost. However, surfice residues, such as NiO-type rock-salt phase and Li2CO3, are often formed at the particle surface due to the high reactivity of Ni3+, and inevitably result in an inferior electrochemical performance, hindering the practical application. Herein, unprecedentedly clean surfaces without any surfice residues are obtained in a representative LiNi0.8Co0.2O2 cathode by Ti-gradient doping. High-resolution transmission electron microscopy (TEM) reveals that the particle surface is composed of a disordered layered phase (approximate to 6 nm in thickness) with the same rhombohedra structure as its interior. The formation of this disordered layered phase at the particle surface is electrochemically favored. It leads to the highest rate capacity ever reported and a superior cycling stability. First-principles calculations further confirm that the excellent electrochemical performance has roots in the excellent chemical/structural stability of such a disordered layered structure, mainly arising from the improved robustness of the oxygen framework by Ti doping. This strategy of constructing the disordered layered phase at the particle surface could be extended to other high-Ni layered transition metal oxides, which will contribute to the enhancement of their electrochemical performance.
Keyworddisordered layered phase high-Ni layered oxide Li-ion batteries stable surface Ti-gradient doping
Indexed BySCI
Language英语
WOS IDWOS:000487514800001
PublisherWILEY-V C H VERLAG GMBH
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/80762
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Kong, Defei,Hu, Jiangtao,Chen, Zhefeng,et al. Ti-Gradient Doping to Stabilize Layered Surface Structure for High Performance High-Ni Oxide Cathode of Li-Ion Battery[J]. ADVANCED ENERGY MATERIALS,2019,9(41).
APA Kong, Defei.,Hu, Jiangtao.,Chen, Zhefeng.,Song, Kepeng.,Li, Cheng.,...&Pan, Feng.(2019).Ti-Gradient Doping to Stabilize Layered Surface Structure for High Performance High-Ni Oxide Cathode of Li-Ion Battery.ADVANCED ENERGY MATERIALS,9(41).
MLA Kong, Defei,et al."Ti-Gradient Doping to Stabilize Layered Surface Structure for High Performance High-Ni Oxide Cathode of Li-Ion Battery".ADVANCED ENERGY MATERIALS 9.41(2019).
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