Journal
MATERIALS RESEARCH BULLETIN
Volume 121, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2019.110625
Keywords
Carbon nanotubes intercalation; Metallic cobalt and N-doped carbon composite; Zeolite imidazolate framework-67; Electrochemical performance; Lithium-sulfur batteries
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Funding
- National Natural Science Foundation of China [51874359, 21706292, 21171174, 21505035]
- Hunan Provincial Science and Technology Plan Project [2017TP1001]
- Hunan Provincial Natural Science Foundation of China [2017JJ3376]
- Changsha Municipal Science and Technology project fund [kq1706062]
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We design a novel sulfur host composite with carbon nanotubes (CNTs) intercalated to the polyhedrons consisting of metallic cobalt and N-doped carbon derived from zeolite imidazolate framework-67 (Co-N-C/CNTs). As compared with the pristine Co-N-C, the intercalated CNTs can lead to significant enhancements of specific surface area, sulfur loading and electroconductivity, thus pronouncedly improving the overall Li-S battery performance. More specifically, the Co-N-C/CNTs/S cathode delivers an initial discharge capacity of 1440.6 mA h g(-1) at 0.1C while 1104.4 mA h g(-1) for Co-N-C/S. At 1C, the capacity decay rate of Co-N-C/CNTs/S is 0.09% per cycle after 500 cycles with the coulombic efficiency more than 98.2%, while 0.14% per cycle with the coulombic efficiency of 96.4% for Co-N-C/S. Evidently, the interpenetration of CNTs into the sulfur host materials is a simple and effective strategy to promote the Li-S battery performance.
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