期刊
NANO RESEARCH
卷 8, 期 8, 页码 2663-2675出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-015-0773-3
关键词
hollow spheres; porous carbon; sulfur/carbon cathode; lithium-sulfur batteries
类别
资金
- National Basic Research Program of China [2011CB932403, 2015CB932300]
- National Natural Science Foundation of China [21301144, 21390390, 21131005, 21333008, 21420102001]
Lithium-sulfur batteries have attracted increasing attention because of their high theoretical capacity. Using sulfur/carbon composites as the cathode materials has been demonstrated as an effective strategy to optimize sulfur utilization and enhance cycle stability as well. In this work, hollow-in-hollow carbon spheres with hollow foam-like cores (HCSF@C) are prepared to improve both capability and cycling stability of lithium-sulfur batteries. With high surface area and large pore volumes, the loading of sulfur in HCSF@C reaches up to 70 wt.%. In the resulting S/HCSF@C composites, the outer carbon shell serves as an effective protection layer to trap the soluble polysulfide intermediates derived from the inner component. Consequently, the S/HCSF@C cathode retains a high capacity of 780 mAh/g after 300 cycles at a high charge/discharge rate of 1 A/g.
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