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Issue 14, 2018
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Hierarchical MoS2/Carbon microspheres as long-life and high-rate anodes for sodium-ion batteries

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Abstract

Sodium-ion batteries (SIBs) are considered promising low-cost alternatives to prevailing lithium-ion batteries (LIBs). The inherently sluggish kinetics of their anode materials, however, poses a great challenge to the SIBs' rate capabilities. This work reports the synthesis of novel MoS2/Carbon (MoS2/C) microspheres with three-dimensional (3D) architecture as an anode for SIBs using a facile hydrothermal strategy. The MoS2/C electrode delivers a reversible capacity of 498 mA h g−1 at 100 mA g−1, which stabilizes at 450 mA h g−1 after 100 cycles. Even at 4 A g−1, the electrode maintains a high reversible capacity above 310 mA h g−1 after 600 cycles, demonstrating its superior rate capability and long-term cyclic stability. Quantitative kinetics analysis reveals a pseudocapacitance-dominated Na+ storage mechanism, especially at high current densities. Furthermore, density functional theory (DFT) calculations show that the Na transport rates are faster through the MoS2/C heterointerface, due to a low diffusion energy barrier, than along the MoS2/MoS2 bilayers.

Graphical abstract: Hierarchical MoS2/Carbon microspheres as long-life and high-rate anodes for sodium-ion batteries

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Article information


Submitted
20 Dec 2017
Accepted
06 Mar 2018
First published
06 Mar 2018

J. Mater. Chem. A, 2018,6, 5668-5677
Article type
Paper

Hierarchical MoS2/Carbon microspheres as long-life and high-rate anodes for sodium-ion batteries

J. Wu, Z. Lu, K. Li, J. Cui, S. Yao, M. Ihsan-ul Haq, B. Li, Q. Yang, F. Kang, F. Ciucci and J. Kim, J. Mater. Chem. A, 2018, 6, 5668
DOI: 10.1039/C7TA11119C

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