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Insight on the atomic structure of Li2MnO3 in Li-rich Mn-based cathode material and the impact of its atomic arrangement on electrochemical performance

Abstract

The Li-rich Mn-based cathode materials have been considered as promising candidates for next generation Li-ion battery due to their high-energy density, low cost and non-toxicity. However, the atomic arrangement of such materials and the relationship between microstructure and electrochemical performance are still not fully understood. In this paper, local heterogeneity in crystal lattice is directly observed in synthesized Li2MnO3/LiMO2 (M = Ni, Mn) cathode materials. With SAED application, for the first time, we accordingly uncover that the lattice heterogeneity is induced by different Li2MnO3 atomic arrangements coexisting in same crystal domain. The co-growth of Li2MnO3 with different orientations is proved to be defective feature, which would induce atom vacancies concentration in lattice and increase the risk of layered structure collapse in cycling process. The electrochemical test results also suggest that composition with relativlely uniform Li2MnO3 arrangement exhibits better cycling performance (the capacity retention is as high as 95.1% after 50 cycles at 0.1C), oppositely, multiple complex Li2MnO3 arrangements coexisting results in poor cycling performance (the capacity retention is below 70% after 50 cycles at 0.1C). The entirely different cycling behaviours and corresponding lattice structure comparison between primary and cycled are shown to manifest the effect of Li2MnO3 arrangement on electrochemical property and structural stability, providing one possible explanation for the capacity degradation of the Li-rich materials.

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Publication details

The article was received on 10 Mar 2017, accepted on 09 May 2017 and first published on 09 May 2017


Article type: Paper
DOI: 10.1039/C7TA02151H
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Insight on the atomic structure of Li2MnO3 in Li-rich Mn-based cathode material and the impact of its atomic arrangement on electrochemical performance

    Y. Song, X. Zhao, C. Wang, H. Bi, J. Zhang, S. Li, M. Wang and R. Che, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA02151H

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