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  Mg-Pillared LiCoO2: Towards Stable Cycling at 4.6 V

Huang, Y., Zhu, Y., Fu, H., Ou, M., Hu, C., Yu, S., et al. (2021). Mg-Pillared LiCoO2: Towards Stable Cycling at 4.6 V. Angewandte Chemie International Edition, 60(9), 4682-4688. doi:10.1002/anie.202014226.

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 Creators:
Huang, Yangyang1, Author
Zhu, Yongcheng1, Author
Fu, Haoyu1, Author
Ou, Mingyang1, Author
Hu, Chenchen1, Author
Yu, Sijie1, Author
Hu, Zhiwei2, Author              
Chen, Chien-Te1, Author
Jiang, Gang1, Author
Gu, Hongkai1, Author
Lin, He1, Author
Luo, Wei1, Author
Huang, Yunhui1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863461              

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 Abstract: LiCoO2 is used as a cathode material for lithium-ion batteries, however, cationic/anodic-redox-induced unstable phase transitions, oxygen escape, and side reactions with electrolytes always occur when charging LiCoO2 to voltages higher than 4.35 V, resulting in severe capacity fade. Reported here is Mg-pillared LiCoO2. Dopant Mg ions, serving as pillars in the Li-slab of LiCoO2, prevent slab sliding in a delithiated state, thereby suppressing unfavorable phase transitions. Moreover, the resulting Li-Mg mixing structure at the surface of Mg-pillared LiCoO2 is beneficial for eliminating the cathode-electrolyte interphase overgrowth and phase transformation in the close-to-surface region. Mg-pillared LiCoO2 exhibits a high capacity of 204 mAh g(-1) at 0.2 C and an enhanced capacity retention of 84 % at 1.0 C over 100 cycles within the voltage window of 3.0-4.6 V. In contrast, pristine LiCoO2 has a capacity retention of 14 % within the same voltage window.

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Language(s): eng - English
 Dates: 2021-02-232021-02-23
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000604534600001
DOI: 10.1002/anie.202014226
 Degree: -

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Title: Angewandte Chemie International Edition
  Abbreviation : Angew. Chem., Int. Ed.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 60 (9) Sequence Number: - Start / End Page: 4682 - 4688 Identifier: ISSN: 1433-7851
CoNE: https://pure.mpg.de/cone/journals/resource/1433-7851