121st General Meeting of the KCS

Type Poster Presentation
Area Electrochemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code ELEC.P-571
Subject Milkweed fiber derived mesoporous carbon nanotiles for enhanced performance of lithium-sulfur batteries
Authors Euh Duck Jeong*, JOO-WOON LEE1, Junki Kim2
National Research Facilities and Equipment Center, Korea Basic Science Institute, Korea
1Korea National University of Transportation, Korea
2Dong-A University, Korea
Abstract Mesoporous carbon nanotiles (MCNs) were prepared from milkweed fibers (MFs) by two-step carbonizing and activating process. The MCNs hollow carbon template with a large surface area (1756.92 m2 g-1) is beneficial to both trapping soluble polysulfide intermediates and improved the electrical conductivity of the electrode. MCNs-S cathode active materials were synthesized by using MCNs and dissolved sulfur in CS2 solution. Scanning electron microscopy and high resolution transmission microscopy energy dispersive spectroscopy, X-ray diffractometer, and FT-Infrared spectroscopy, X-ray photoelectron spectroscopy were used to characterize the surface morphology, structures, microtopography and chemical composition of materials. MCNs-S composites are prepared with different sulfur contents (62, 80 and 94 wt.%) and the MCNS-S with 80 wt.% of sulfur content (MCNs-8S) displays an excellent cycle performance. The resulting MCNs-8S composite exhibits a stable specific capacity of 557 mAh g-1 after 200cycles at a current density of 0.5C. In the case of the MCNs-9S with high sulfur content, the capacity is significant increased from 463 mAh g-1 to 743 mAh g-1 after 200 cycles when coupled with a carbon-coated separator. This experiment results provides new carbon materials from biomass for practical application in Li-S batteries.
E-mail edjeong@ksbi.re.kr