Ti‐Gradient Doping to Stabilize Layered Surface Structure for High Performance High‐Ni Oxide Cathode of Li‐Ion Battery
Abstract
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 Li 2 CO 3 , are often formed at the particle surface due to the high reactivity of Ni 3+ , 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 LiNi 0.8 Co 0.2 O 2 cathode by Ti‐gradient doping. High‐resolution transmission electron microscopy (TEM) reveals that the particle surface is composed of a disordered layered phase (≈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 tomore »
- Authors:
-
[1]
- School of Advanced Materials Peking University Shenzhen Graduate School Shenzhen 518055 P. R. China
- Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang Liaoning 110016 P. R. China
- Jülich Centre for Neutron Science Forschungszentrum Jülich GmbH Outstation at Spallation Neutron Source (SNS) Oak Ridge TN 37831‐6473 USA
- School of Advanced Materials Peking University Shenzhen Graduate School Shenzhen 518055 P. R. China, Sustainable Energy Technologies Department Brookhaven National Laboratory Upton NY 11973 USA
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1564503
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Advanced Energy Materials
- Additional Journal Information:
- Journal Name: Advanced Energy Materials Journal Volume: 9 Journal Issue: 41; Journal ID: ISSN 1614-6832
- Publisher:
- Wiley Blackwell (John Wiley & Sons)
- Country of Publication:
- Germany
- Language:
- English
Citation Formats
Kong, Defei, Hu, Jiangtao, Chen, Zhefeng, Song, Kepeng, Li, Cheng, Weng, Mouyi, Li, Maofan, Wang, Rui, Liu, Tongchao, Liu, Jiajie, Zhang, Mingjian, Xiao, Yinguo, and Pan, Feng. Ti‐Gradient Doping to Stabilize Layered Surface Structure for High Performance High‐Ni Oxide Cathode of Li‐Ion Battery. Germany: N. p., 2019.
Web. doi:10.1002/aenm.201901756.
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. Ti‐Gradient Doping to Stabilize Layered Surface Structure for High Performance High‐Ni Oxide Cathode of Li‐Ion Battery. Germany. https://doi.org/10.1002/aenm.201901756
Kong, Defei, Hu, Jiangtao, Chen, Zhefeng, Song, Kepeng, Li, Cheng, Weng, Mouyi, Li, Maofan, Wang, Rui, Liu, Tongchao, Liu, Jiajie, Zhang, Mingjian, Xiao, Yinguo, and Pan, Feng. Mon .
"Ti‐Gradient Doping to Stabilize Layered Surface Structure for High Performance High‐Ni Oxide Cathode of Li‐Ion Battery". Germany. https://doi.org/10.1002/aenm.201901756.
@article{osti_1564503,
title = {Ti‐Gradient Doping to Stabilize Layered Surface Structure for High Performance High‐Ni Oxide Cathode of Li‐Ion Battery},
author = {Kong, Defei and Hu, Jiangtao and Chen, Zhefeng and Song, Kepeng and Li, Cheng and Weng, Mouyi and Li, Maofan and Wang, Rui and Liu, Tongchao and Liu, Jiajie and Zhang, Mingjian and Xiao, Yinguo and Pan, Feng},
abstractNote = {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 Li 2 CO 3 , are often formed at the particle surface due to the high reactivity of Ni 3+ , 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 LiNi 0.8 Co 0.2 O 2 cathode by Ti‐gradient doping. High‐resolution transmission electron microscopy (TEM) reveals that the particle surface is composed of a disordered layered phase (≈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.},
doi = {10.1002/aenm.201901756},
journal = {Advanced Energy Materials},
number = 41,
volume = 9,
place = {Germany},
year = {Mon Sep 23 00:00:00 EDT 2019},
month = {Mon Sep 23 00:00:00 EDT 2019}
}
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