期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 6, 期 14, 页码 5668-5677出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta11119c
关键词
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资金
- Research Grants Council (GRF Projects) [16212814, 16207615, 16227016]
- Innovation and Technology Commission (ITF project) of Hong Kong SAR [ITS/001/17]
- Guangzhou Science and Technology Program [2016201604030020]
- Science and Technology Planning Project of Guangdong Province, China [2016A050503042]
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.
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