Abstract
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.
Original language | English |
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Pages (from-to) | 742-749 |
Number of pages | 8 |
Journal | Nano Energy |
Volume | 12 |
DOIs | |
Publication status | Published - 1 Mar 2015 |
Keywords
- Carbon matrix
- Cathode
- Graphene sheet
- Lithium-sulfur battery
- Multi-walled carbon nanotube