Journal
JOURNAL OF POWER SOURCES
Volume 324, Issue -, Pages 239-252Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.05.080
Keywords
Lithium-sulfur battery; Microporous carbon; Cycle stability; Titanium dioxide; Carbon sulfur composite
Funding
- Ministry of Science and Technology (MoST) [104-2923-M-011 -002 -MY3, 104-2911-I-011 -505 -MY2]
- Taiwan Rising Project from the Ministry of Economic Affairs (MoEA) [104-EC-17-A-08-S1-183]
- NARL National Space Organization [NSPO-S-104105]
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Herein, we design hybrid nanostructured microporous carbon-mesoporous carbon doped titanium dioxide/sulfur composite (MC-Meso C-doped TiO2/S) as a positive electrode material for lithium-sulfur batteries. The hybrid MC-Meso C-doped TiO2 host material is produced by a low-cost, hydrothermal and annealing process. The resulting conductive material shows dual microporous and mesoporous behavior which enhances the effective trapping of sulfur and polysulfides. The hybrid MC-Meso C-doped TiO2/S composite material possesses rutile TiO2 nanotube structure with successful carbon doping while sulfur is uniformly distributed in the hybrid MC-Mesa C-doped TiO2 composite materials after the melt infusion process. The electrochemical measurement of the hybrid material also shows improved cycle stability and rate performance with high sulfur loading (61.04%). The material delivers an initial discharge capacity of 802 mAh g(-1) and maintains it at 578 mAh g(-1) with a columbic efficiency greater than 97.1% after 140 cycles at 0.1 C. This improvement is thought to be attributed to the unique hybrid nanostructure of the MC-Meso C-doped TiO2 host and the good dispersion of sulfur in the narrow pores of the MC spheres and the mesoporous C-doped TiO2 support. (C) 2016 Elsevier B.V. All rights reserved.
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