Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 30, Pages 14885-14893Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta05041d
Keywords
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Funding
- National Natural Science Foundation of China [21104050, 11604045]
- China Postdoctoral Science Foundation [2013M541715, 2014T70541]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Key Laboratory of Advanced Textile Materials and Manufacturing Technology (Zhejiang Sci-Tech University) [2017002]
- Ministry of Education
- Fundamental Research Funds for the Central Universities
- Shanghai Science and Technology Commission [16PJ1400100, 17ZR1440000, 17JC400700]
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The uses of sulfur, which has a high theoretical specific capacity of 1675 mA h g(-1), as a commercial cathode for lithium batteries have been substantially hindered by the insulating nature of sulfur and the dissolution of intermediate polysulfides (Li2Sx, 4 < x <= 8) into the electrolyte. In this work, a spheres-in-tube carbonaceous nanoarchitecture has been successfully engineered as an effective sulfur host, by encapsulating heteroatom-doped hollow carbon spheres into an intact carbonaceous nanotube (I-HCSs@CT). The structural features including hierarchical porosity and the intact nature of the CT wall and HCS framework have cooperatively endowed I-HCSs@CT with outstanding capability of host loading, good electrical conductivity, a high utilization rate and excellent stability of sulfur. As a result, our sulfur/carbon composites deliver a large discharge capacity of 1426 mA h g(-1) at 0.1C with a high sulfur loading of 72.1 wt%. The obtained electrode demonstrates superior high-rate cycling performance, with a high specific capacity of 746 mA h g(-1) at 0.5C being retained after 500 cycles.
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