| Ti-Gradient Doping to Stabilize Layered Surface Structure for High Performance High-Ni Oxide Cathode of Li-Ion Battery | |
| Kong, Defei1; Hu, Jiangtao1; Chen, Zhefeng1; Song, Kepeng2; Li, Cheng3; Weng, Mouyi1; Li, Maofan1; Wang, Rui1; Liu, Tongchao1; Liu, Jiajie1; Zhang, Mingjian1,4; Xiao, Yinguo1; Pan, Feng1 | |
| Corresponding Author | Zhang, Mingjian(zhangmj@pkusz.edu.cn) ; Xiao, Yinguo(y.xiao@pku.edu.cn) ; Pan, Feng(panfeng@pkusz.edu.cn) |
| 2019-09-23 | |
| Source Publication | ADVANCED ENERGY MATERIALS
 |
| ISSN | 1614-6832 |
| Pages | 9 |
| Abstract | 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. |
| Keyword | disordered layered phase high-Ni layered oxide Li-ion batteries stable surface Ti-gradient doping |
| Funding Organization | Guangdong Key-lab Project ; Shenzhen Science and Technology Research |
| DOI | 10.1002/aenm.201901756 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | Guangdong Key-lab Project[2017B0303010130] ; Shenzhen Science and Technology Research[ZDSYS201707281026184] |
| WOS Research Area | Chemistry ; Energy & Fuels ; Materials Science ; Physics |
| WOS Subject | Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter |
| WOS ID | WOS:000487514800001 |
| Publisher | WILEY-V C H VERLAG GMBH |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/135546 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Zhang, Mingjian; Xiao, Yinguo; Pan, Feng |
| Affiliation | 1.Peking Univ, Shenzhen Grad Sch, Sch Adv Mat, Shenzhen 518055, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China 3.Forsch Zentrum Julich GmbH Outstn Spallat Neutron, Julich Ctr Neutron Sci, Oak Ridge, TN 37831 USA 4.Brookhaven Natl Lab, Sustainable Energy Technol Dept, Upton, NY 11973 USA |
| 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. |
| 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. |
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