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Issue 13, 2020
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Evolution of Ni/Li antisites under the phase transition of a layered LiNi1/3Co1/3Mn1/3O2 cathode

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Abstract

At present, the expectation for batteries with an enhanced performance has accelerated the development of high-performance cathodes, among which the layered cathodes have drawn significant attention and probably hold the key to unlocking the capacity limitations of Li-ion batteries (LIBs). However, the capacity advantages of layered cathodes, especially in the high voltage delithiation region, cannot be effectively stabilized because of the uncontrollable generation of Li-transition metal antisites under the phase transition. Furthermore, few convincing results have been provided to elucidate their contribution to the electrochemical performance. To this end, we found, theoretically, that in a layered LiNi1/3Co1/3Mn1/3O2 cathode, the formation of Ni/Li antisites can occur spontaneously upon the Li–Ni linear exchange mechanism. After being introduced into the layered LiNi1/3Co1/3Mn1/3O2, these antisites are prone to clustering together within the (003) plane to introduce some discrete stage-like structures, which will cause serious Jahn–Teller distortions and influence the Li ion 2D diffusion and also relax the c axis, hence changing the phase transition process. These interesting findings provide deep and insightful view to further understand the cation disorder phenomenon and the high voltage features of layered cathodes, and also demonstrate a rewarding avenue for building better LIBs.

Graphical abstract: Evolution of Ni/Li antisites under the phase transition of a layered LiNi1/3Co1/3Mn1/3O2 cathode

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Supplementary files

Article information


Submitted
11 Feb 2020
Accepted
09 Mar 2020
First published
10 Mar 2020

J. Mater. Chem. A, 2020,8, 6337-6348
Article type
Paper

Evolution of Ni/Li antisites under the phase transition of a layered LiNi1/3Co1/3Mn1/3O2 cathode

A. Gao, Y. Sun, Q. Zhang, J. Zheng and X. Lu, J. Mater. Chem. A, 2020, 8, 6337
DOI: 10.1039/D0TA01642J

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