Ti-Gradient Doping to Stabilize Layered Surface Structure for High Performance High-Ni Oxide Cathode of Li-Ion Battery

doi:10.1002/aenm.201901756

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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 2; Hu, Jiangtao 2; Chen, Zhefeng 2; Song, Kepeng 3; Li, Cheng 1; Weng, Mouyi 2; Li, Maofan 2; Wang, Rui 2; Liu, Tongchao 2; Liu, Jiajie 2
刊名	ADVANCED ENERGY MATERIALS
	2019-09-23
页码	9
关键词	disordered layered phase high-Ni layered oxide Li-ion batteries stable surface Ti-gradient doping
ISSN号	1614-6832
DOI	10.1002/aenm.201901756
通讯作者	Zhang, Mingjian(zhangmj@pkusz.edu.cn) ; Xiao, Yinguo(y.xiao@pku.edu.cn) ; Pan, Feng(panfeng@pkusz.edu.cn)
英文摘要	High-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.
资助项目	Guangdong Key-lab Project[2017B0303010130] ; Shenzhen Science and Technology Research[ZDSYS201707281026184]
WOS研究方向	Chemistry ; Energy & Fuels ; Materials Science ; Physics
语种	英语
出版者	WILEY-V C H VERLAG GMBH
WOS记录号	WOS:000487514800001
资助机构	Guangdong Key-lab Project ; Shenzhen Science and Technology Research
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/135545]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhang, Mingjian; Xiao, Yinguo; Pan, Feng
作者单位	1.Forsch Zentrum Julich GmbH Outstn Spallat Neutron, Julich Ctr Neutron Sci, Oak Ridge, TN 37831 USA 2.Peking Univ, Shenzhen Grad Sch, Sch Adv Mat, Shenzhen 518055, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China 4.Brookhaven Natl Lab, Sustainable Energy Technol Dept, Upton, NY 11973 USA
推荐引用方式 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.
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.
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 (2019):9.