| 초록 |
Hollow mesoporous carbon nanoparticles (HMCs) doped by heteroatoms with an average diameter of approximately 450 nm with high surface area and well-defined pore structure are prepared based on the template of silica core/mesoporous silica shell nanoparticles. Both silica core and shell phase of HMC were etched by Teflon which also doped carbon framework by fluorine. To fabricate the cathode for Li-S battery application, these HMCs were impregnated with sulfur through melt-diffusion method. The TGA data showed that the content of sulfur was approximately 59 wt%. The sulfur, impregnated in the voids of the carbon framework of the HMCs, suppressed the shuttle phenomenon, frequently found in the Li-S battery applications. The electrochemical performances of the electrodes prepared using HMCs were measured by cyclic voltammetry, discharge-charge cycling test and impedance measurement. The microstructures and surface characteristics of HMCs are characterized by Raman, EA, XRD, BET and XPS. |
