| 초록 |
Rechargeable lithium-sulfur batteries have been considered as one of the most promising electrochemical energy storage devices on account of high theoretical capacity (1674 mAh/g) and environmental sustainability. Nevertheless, Li-S batteries have been suffering from fast capacity decay and low coulombic efficiency, attributed to the dissolution of polysulfide during charge/discharge cycles. Many researchers have devoted their efforts in developing 3D structures in order to confine the polysulfide within the skeleton. In this study, we synthesized organic crystals having 3D-tubular structure with highly interactive surfaces of thiol, enabling physical/chemical confinement of polysulfide within the organic crystal framework. From battery cycling test, the organic crystals were revealed to effectively prevent dissolution of polysulfide over a few hundred cycles. The unique chemical interaction between the organic crystals and polysulfide was responsible for the good cycling performance. |
