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Issue 16, 2018
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Rocksalt-type metal sulfide anodes for high-rate sodium storage

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The low electrical conductivity of α-MnS generally impedes its use as an electrode material for sodium-ion batteries. However, in this study, an unprecedentedly high capacity and long-term cyclability were achieved for an α-MnS electrode at moderate and high rates by introducing electro-conductive carbon surfaces. A capacity of 302 mA h g−1 was delivered in the first cycle with 85% capacity retention after 200 cycles at 100 mA g−1. Furthermore, the cycling performance at 10C (6.1 A g−1) demonstrated the feasibility of high-rate sodium storage using this anode, with 78% retention of the initial capacity after 200 cycles. This performance was reproduced in a NaCrO2/α-MnS full cell as well. X-ray diffraction, X-ray photoelectron spectroscopy, and time-of-flight secondary-ion mass spectroscopy were used to unveil the reaction mechanism, and the results provided possible explanations for the good electrode performance and rapid sodium storage capabilities.

Graphical abstract: Rocksalt-type metal sulfide anodes for high-rate sodium storage

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The article was received on 28 Jan 2018, accepted on 14 Mar 2018 and first published on 15 Mar 2018

Article type: Paper
DOI: 10.1039/C8TA00901E
Citation: J. Mater. Chem. A, 2018,6, 6867-6873
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    Rocksalt-type metal sulfide anodes for high-rate sodium storage

    C. Jo, J. U. Choi and S. Myung, J. Mater. Chem. A, 2018, 6, 6867
    DOI: 10.1039/C8TA00901E

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