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Mitigating the capacity and voltage decay of lithium-rich layered oxide cathodes by fabricating Ni/Mn graded surface

Abstract

Lithium-rich layered oxides (LLOs) deliver high energy-density of above 1000 Wh Kg−1 owing to the new charge/discharge mechanisms, which are regarded as the up-and-coming cathodes for the next-generation lithium-ion batteries (LIBs). However, it usually suffers from serious capacity and voltage decay during repeated cycles, limiting their widely practical applications. Herein, Ni/Mn graded LLOs, in which nickel content increases gradually whilst manganese content decreases continuously at the outer surface of secondary particles, are rationally designed and further prepared by a modified co-precipitation route combined with solid-state reactions. As expected, this Ni/Mn graded LLOs exhibit higher reversible capacity of 290.9 mAh g−1, much improved stability of capacity and voltage, ~90% capacity retention and high voltage of 3.23 V (vs. Li/Li+) even after 200 cycles, compared with the normal LLOs. XPS and XRD results of cycled electrodes indicate that these enhanced electrochemical properties are probably ascribed to the nickel-increased surface that suppresses the structural transitions from layered to spinel and/or rock-salt phases as well as side-reactions on the electrode/electrolyte interface. Importantly, this Ni/Mn graded structure opens up a feasible and effective tactics to mitigate the capacity and voltage decay of LLOs and possibly promote the process of its practical applications in high-energy LIBs.

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Publication details

The article was received on 30 Aug 2017, accepted on 07 Nov 2017 and first published on 07 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA07659B
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Mitigating the capacity and voltage decay of lithium-rich layered oxide cathodes by fabricating Ni/Mn graded surface

    F. Li, Y. Wang, S. Gao, P. Hou and L. Zhang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA07659B

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