High capacity cathode materials for Li-S batteries
- High capacity cathode materials for Li-S batteries
- Ho Suk Ryu; Jin Woo Park; Jinsoo Park; 안재평; Ki-Won Kim; Jou-Hyeon Ahn; Tae-Hyeon Nam; Guoxiu Wang; Hyo-Jun Ahn
- New cathode; TEM; Sulfur cathode
- Issue Date
- Journal of materials chemistry. A, Materials for energy and sustainability
- VOL 1, 1573-1578
- 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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