Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 1, Issue 5, Pages 1573-1578Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ta00056c
Keywords
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Funding
- Pioneer Research Center for Nano-morphic Biological Energy Conversion and Storage
- WCU Center for Next Generation Battery through Korea Science and Engineering Foundation (KOSEF)
- Ministry of Education, Science and Technology
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To enhance the stability of sulfur cathode for a high energy lithium-sulfur battery, sulfur-activated carbon (S-AC) composite was prepared by encapsulating sulfur into micropores of activated carbon using a solution-based processing technique. In the analysis using the prepared specimen of S-AC composite by the focused ion beam (FIB) technique, the elemental sulfur exists in a highly dispersed state inside the micropores of activated carbon, which has a large surface area and a narrow pore distribution. The S-AC composite was characterized through X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) method, selected area electron diffraction (SAED), energy dispersive X-ray spectrometry (EDX), Fourier transform infrared spectroscopy (FT-IR), thermogravimetry analysis (TGA), and field emission scanning electron microscopy (FESEM). A lithium-sulfur cell using the S-AC composite has a high first discharge capacity over 800 mA h g(-1) S even at a high current density such as 2C (3200 mA g(-1) S) and has good cycleability around 500 mA h g(-1) S discharge capacity at the 50th cycle at the same current density.
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