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  Li-Ti Cation Mixing Enhanced Structural and Performance Stability of Li-Rich Layered Oxide

Liu, S., Liu, Z., Shen, X., Wang, X., Liao, S.-C., Yu, R., et al. (2019). Li-Ti Cation Mixing Enhanced Structural and Performance Stability of Li-Rich Layered Oxide. Advanced Energy Materials, 1901530, pp. 1-10. doi:10.1002/aenm.201901530.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-7653-A Version Permalink: http://hdl.handle.net/21.11116/0000-0004-7655-8
Genre: Journal Article

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 Creators:
Liu, Shuai1, Author
Liu, Zepeng1, Author
Shen, Xi1, Author
Wang, Xuelong1, Author
Liao, Sheng-Chieh2, Author              
Yu, Richeng1, Author
Wang, Zhaoxiang1, Author
Hu, Zhiwei3, Author              
Chen, Chien-Te1, Author
Yu, Xiqian1, Author
Yang, Xiaoqing1, Author
Chen, Liquan1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
3Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863461              

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 Abstract: Li-rich layered metal oxides are one type of the most promising cathode materials in lithium-ion batteries but suffer from severe voltage decay during cycling because of the continuous transition metal (TM) migration into the Li layers. A Li-rich layered metal oxide Li1.2Ti0.26Ni0.18Co0.18Mn0.18O2 (LTR) is hereby designed, in which some of the Ti4+ cations are intrinsically present in the Li layers. The native Li-Ti cation mixing structure enhances the tolerance for structural distortion and inhibits the migration of the TM ions in the TMO2 slabs during (de)lithiation. Consequently, LTR exhibits a remarkable cycling stability of 97% capacity retention after 182 cycles, and the average discharge potential drops only 90 mV in 100 cycles. In-depth studies by electron energy loss spectroscopy and aberration-corrected scanning transmission electron microscopy demonstrate the Li-Ti mixing structure. The charge compensation mechanism is uncovered with X-ray absorption spectroscopy and explained with the density function theory calculations. These results show the superiority of introducing transition metal ions into the Li layers in reinforcing the structural stability of the Li-rich layered metal oxides. These findings shed light on a possible path to the development of Li-rich materials with better potential retention and a longer lifespan.

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Language(s): eng - English
 Dates: 2019-07-192019-07-19
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000476337400001
DOI: 10.1002/aenm.201901530
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Title: Advanced Energy Materials
  Abbreviation : Adv. Energy Mater.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: - Sequence Number: 1901530 Start / End Page: 1 - 10 Identifier: ISSN: 1614-6832
CoNE: https://pure.mpg.de/cone/journals/resource/1614-6832