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Issue 43, 2016
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Highly active mixed-valent MnOx spheres constructed by nanocrystals as efficient catalysts for long-cycle Li–O2 batteries

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Abstract

Developing highly active and cost-effective catalysts for Li–O2 batteries with high capacity, long cycle life and good rate performance is still challenging. In this work, a simple and efficient strategy is developed for the synthesis of MnOx spheres with a core–multishell structure. The spheres are assembled by ultrafine manganese oxide nanocrystals containing mixed-valent MnII, MnIII, and MnIV species. The Li–O2 batteries with MnOx sphere electrodes can deliver high discharge capacity, long-life cycling and excellent rate performance, namely, a specific capacity as large as 9709 mA h gcarbon−1 is delivered at 100 mA gcarbon−1 and maintained over 320 cycles at a limited capacity of 1000 mA h gcarbon−1. Even at a high capacity (2000 mA h gcarbon−1) with a high current density of 200 mA gcarbon−1, the batteries can still endure more than 120 cycles. During the long cycling, the batteries show ultra-stable electrochemical performance with a high discharge potential (2.8–2.9 V) and low charge voltage (3.7–3.8 V). High-resolution transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy analyses for cycled mixed-valent MnOx electrodes are used to reveal the electrochemical mechanism.

Graphical abstract: Highly active mixed-valent MnOx spheres constructed by nanocrystals as efficient catalysts for long-cycle Li–O2 batteries

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Publication details

The article was received on 31 Aug 2016, accepted on 10 Oct 2016 and first published on 11 Oct 2016


Article type: Paper
DOI: 10.1039/C6TA07488J
Citation: J. Mater. Chem. A, 2016,4, 17129-17137
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    Highly active mixed-valent MnOx spheres constructed by nanocrystals as efficient catalysts for long-cycle Li–O2 batteries

    S. Zhang, Z. Wen, Y. Lu, X. Wu and J. Yang, J. Mater. Chem. A, 2016, 4, 17129
    DOI: 10.1039/C6TA07488J

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