Journal
JOURNAL OF POWER SOURCES
Volume 357, Issue -, Pages 11-18Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.04.092
Keywords
Lithium-sulfur batteries; Hollow carbon nanospheres; Trithiocyanuric acid; Vulcanization; Composite
Funding
- National Natural Science Foundation of China [51202150, 51272161]
- 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]
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Lithium-sulfur batteries are the most promising candidates for future high-energy applications because of the unparalleled capacity of sulfur (1675 mAh g(-1)). However, lithium-sulfur batteries have limited cycle life and rate capability due to the dissolution of polysulfides and the extremely low electronic conductivity of sulfur. To solve these issues, various porous carbons including hollow carbon nano-spheres (HCNs) have been used for improving the conductivity. However, these methods still suffer from polysulfides dissolution/loss owing to their weak physical adsorption to polysulfides. Herein, we introduced a covalent grafting route to composite the HCNs and the vulcanized trithiocyanuric acid (TTCA). The composite exhibits a high loading of the vulcanized TTCA by the HCNs with high surface area and large pore volume, and covalent bonds to sulfur, effectively depressing the dissolution of polysulfides. The first discharge capacity of the composite reaches 1430 mAh g(-1) at 0.1 C and 1227 mAh g(-1) at 0.2 C. (C) 2017 Elsevier B.V. All rights reserved.
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