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Achieving Stable Cycling of LiCoO 2 at 4.6 V by Multilayer Surface Modification by Cheng, Tao; Ma, Zhongtao; Qian, Ruicheng; Wang, Yeting; Cheng, Qin; Lyu, Yingchun; Nie, Anmin; Guo, Bingkun is a Engineering article available to read on EtoBox.

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## Abstract LiCoO~2~, which was first proposed as a cathode in 1980 by Prof. John B. Goodenough, is still one of the most popular commercial cathodes for lithium‐ion batteries. Tremendous efforts have been invested in increasing the capacity of LiCoO~2~ by charging to high voltage. However, a series of issues, such as structural instability and dramatic side reactions with electrolytes, can emerge as cut‐off voltage above 4.5 V (vs Li/Li^+^). Here, a surface modification strategy with a multilayer structure is provided, involving a Zn‐rich surface coating layer, rock‐salt phase buffer layer and surface gradient Al doping layer, to overcome the detrimental issues and achieve stable cycling of LiCoO~2~ at 4.6 V. The complete coating of the modification layer restrains the interfacial side reactions with electrolyte and inhibits the impedance growth. The phenomenon of quasi‐epitaxial growth demonstrates that the multilayer structure significantly reduces the lattice mismatch between host LiCoO~2~ and surface coating layer and enhances the stability of the Zn‐rich outside layer, which promote the long‐term effectiveness of the modification. Furthermore, the disordered rock‐salt phase l

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Author

Cheng, Tao; Ma, Zhongtao; Qian, Ruicheng; Wang, Yeting; Cheng, Qin; Lyu, Yingchun; Nie, Anmin; Guo, Bingkun

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley (ISSN 1616-301X)

Published

2020

Language

EN

Field

Engineering (Physical Sciences)