期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 24, 期 8, 页码 1988-1997出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201705211
关键词
hollow carbon nanospheres; lithium-sulfur batteries; ultrahigh-surface-area
资金
- National Natural Science Foundation of China [51202150, 51272161, 21703141]
- Program of Introducing Innovative Research Team in Dongguan [2014607109]
- foundation of the State Key Laboratory of Solidification Processing in NWPU [SKLSP201110]
- Shenzhen Basic Research Program [JCYJ20160422091418366]
- foundation of Shenzhen University Innovation and Development [PIDFP-ZR2017022]
Hollow carbon nanospheres (HCNs) with specific surface areas up to 2949 m(2) g(-1) and pore volume up to 2.9 cm(3) g(-1) were successfully synthesized from polyaniline-co-polypyrrole hollow nanospheres by carbonization and CO2 activation. The cavity diameter and wall thickness of HCNs can be easily controlled by activation time. Owing to their large inner cavity and enclosed structure, HCNs are desirable carriers for encapsulating sulfur. To better understand the effects of pore characteristics and sulfur contents on the performances of lithium-sulfur batteries, three composites of HCNs and sulfur are prepared and studied in detail. The composites of HCNs with moderate specific surface areas and suitable sulfur content present a better performance. The first discharge capacity of this composite reaches 1401 mAhg(-1) at 0.2 C. Even after 200 cycles, the discharge capacity remains at 626 mAhg(-1).
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