Mesoporous microspheres as High Performance Cathodes for Lithium-Sulfur Batteries
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초록
내용
Practical application of lithium-sulfur batteries is mainly limited by a low areal capacity around 2 mAh/cm2. In order to achieve a high-areal-capacity cathode, we prepare mesoporous microspheres with high pore volume. Triazine crystals of melamine and cyanuric acid (MCA) is utilized as structure directing agents, into which glucose is introduced as additional carbon source. Glucose trapped inside crystal structure of MCA is heated to 600 degrees Celsius under nitrogen atmosphere for carbonization. The resulting microspheres (2~6 μm), MCA-gl-20M-600, features nitrogen-rich microstructure and porous structure with a pore volume of 2.3 cm3/g, a BET surface area of 367.54m2/g and a pore size of 35 nm. MCA-GL-20M-600 enables a high sulfur-loading cathode (~10 mg/cm2) and thereby exhibits an areal capacity of ~8.5 mAh/cm2 at C/5 over 100 cycles with minor capacity loss.