Journal
NANO ENERGY
Volume 12, Issue -, Pages 742-749Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2014.12.042
Keywords
Lithium-sulfur battery; Cathode; Graphene sheet; Mutti-walled carbon; nanotube; Carbon matrix
Categories
Funding
- National Natural Science Foundation of China [21373028]
- National 863 Program [2011AA11A256]
- New Century Educational Talents Plan of Chinese Education Ministry [NCET-12-0050]
- Beijing Novel Program [Z121103002512029]
- Ford University Research Program (URP) project
- U.S. Department of Energy [DE-AC0206CH11357]
- Vehicle Technologies Office, Department of Energy (DOE) Office of Energy Efficiency and Renewable Energy (EERE)
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A novel carbon/sulfur composite has been fabricated by means of thermal and hydro-thermal treatments to serve as the cathode in Li -S batteries. The carbon matrix consists of graphene nanosheet (GS) and multiwalled carbon nanotube (MWCNT). The GS/MWCNT@S composite allows for infiltration of electrolyte into the cathode, assists in entrapment of polysulfide intermediates, and accommodates some of the stress and volume expansion that occurs during charge discharge processes. In addition, the uniform distribution of sulfur in the conductive carbon matrix promotes utilization of the active materials. A Li-S cell containing the GS/MWCNT@S cathode delivered a capacity of 1290.8 mAh/g and exhibited stable specific capacities up to 612.1 mAh/g after 200 cycles at 0.1 C. These results demonstrate that this cathode material is a promising candidate for rechargeable lithium batteries with high energy density. (C) 2015 Published by Elsevier Ltd.
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