| 초록 |
A activated nitrogen-doped honeycomb-shape porous carbon (n-hC ) is successfully synthesized through a facile hydrothermal carbonization of lignin precursor, subsequent KOH activation, and N-doping process. The as-obtained n-hC shows large surface area and pore volume and N composition (3.47%) . The n-hC is then used as hosting matrix with a sulfur loading of 64.1wt% (n-hC@S) through in-situ redox reaction of Na2S2O3 with HCl. This n-hC@S composite achieves a high initial discharge capacity of 1295.5 mAh g-1 at 0.1C, while preserving 938.6 mAh g-1 over 300 cycles with a low capacity decay of 0.08% per cycle. The excellent electrochemical performance of n-hC@S is attributed to the synergistic effect of porous honeycomb structure and N-incorporation, which can effectively prevent the diffusion of sulfur from the host material by physical barrier and strong chemical adsorption between n-hC and sulfur. |
