Journal Article

FZJ-2021-02516

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Twin boundary defect engineering improves lithium-ion diffusion for fast-charging spinel cathode materials

Wang, R. ; Chen, X. ; Huang, Z. ; Yang, J. ; Liu, F. ; Chu, M. ; Liu, T. ; Wang, C. ; Zhu, W. ; Li, S. ; Li, S. ; Zheng, J. ; Chen, J. ; He, L. ; Jin, L.FZJ* ; Pan, F. ; Xiao, Y. (Corresponding author)

2021
Nature Publishing Group UK [London]

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Please use a persistent id in citations: http://hdl.handle.net/2128/27907  doi:10.1038/s41467-021-23375-7

Abstract: Defect engineering on electrode materials is considered an effective approach to improve the electrochemical performance of batteries since the presence of a variety of defects with different dimensions may promote ion diffusion and provide extra storage sites. However, manipulating defects and obtaining an in-depth understanding of their role in electrode materials remain challenging. Here, we deliberately introduce a considerable number of twin boundaries into spinel cathodes by adjusting the synthesis conditions. Through high-resolution scanning transmission electron microscopy and neutron diffraction, the detailed structures of the twin boundary defects are clarified, and the formation of twin boundary defects is attributed to agminated lithium atoms occupying the Mn sites around the twin boundary. In combination with electrochemical experiments and first-principles calculations, we demonstrate that the presence of twin boundaries in the spinel cathode enables fast lithium-ion diffusion, leading to excellent fast charging performance, namely, 75% and 58% capacity retention at 5 C and 10 C, respectively. These findings demonstrate a simple and effective approach for fabricating fast-charging cathodes through the use of defect engineering.

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Contributing Institute(s):

1. Physik Nanoskaliger Systeme (ER-C-1)

Research Program(s):

1. 535 - Materials Information Discovery (POF4-535) (POF4-535)

Appears in the scientific report 2021

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