| 초록 |
Due to the high theoretical capacity (1675 mA h g−1), energy density (2600 W h kg−1), lithium sulfur batteries have been considered promising candidates for next energy storage system. Nevertheless, the poor conductivity of sulfur and the shuttle effect hinder the practical applications. Using conductive porous materials as host materials of sulfur can effectively improve the performance of lithium sulfur batteries. N-containing porous aromatic framework 41 (PAF-41) with hierarchical porous structure has been readily synthesized by using triphenylamine as the monomer. The hierarchical porous skeleton and the presence of N atoms effectively confine the electroactive species by synergistic physisorption and chemisorption to alleviate the shuttle effect. As a result, SPAF-41 composite cathode with high sulfur loading of 72 wt% delivers a high capacity of 725.8 mA h g−1 at 0.5 C in the first cycle and a low decay rate 0.06% per cycle is achieved within 500 charge-discharge cycles. |
