Journal
JOURNAL OF POWER SOURCES
Volume 389, Issue -, Pages 169-177Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2018.04.015
Keywords
Molybdenum sulfide/carbon nanotube; Interlayer; Polysulfides trapping; Lithium sulfur batteries
Funding
- NSFC [51472141, 51788104]
- National Basic Research Program of China [2016YFA0301001, 2017YFA0205800]
- Beijing Municipal Science and Technology Commission [D161100002416003]
- Tsinghua University Tutor Research Fund
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Ultrathin and lightweight MoS2/carbon nanotube (CNT) interlayers are developed to effectively trap polysulfides in high-performance lithium-sulfur (Li-S) batteries. The MoS2/CNT interlayer is constructed by loading MoS2 nanosheets onto a cross-stacked CNT film. The CNT film with excellent conductivity and superior mechanical properties provides the Li-S batteries with a uniform conductive network, a supporting skeleton for the MoS2 nanosheets, as well as a physical barrier for the polysulfides. Moreover, chemical interactions and bonding between the MoS2 nanosheets and the polysulfides are evident. The electrode with the MoS2/CNT interlayer delivers an attractive specific capacity of 784 mA h g(-1) at a high capacity rate of 10 C. In addition, the electrode demonstrates a high initial capacity of 1237 mA h g(-1) and a capacity fade as low as -0.061% per cycle over 500 charge/discharge cycles at 0.2 C. The problem of self-discharge can also be suppressed with the introduction of the MoS2/CNT interlayer. The simple fabrication procedure, which is suitable for commercialization, and the outstanding electrochemical performance of the cells with the MoS2/CNT interlayer demonstrate a great potential for the development of high-performance Li-S batteries.
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