| 초록 |
Fully-incorporated and high-content sulfur in porous carbon is crucial for high performance Li−S batteries. To this end, unlike conventional methods to control the pore of carbon hosts, we demonstrate controlling the surface tension of the solution in the process of penetrating the sulfur-dissolved solution. We find, experimentally and theoretically, that the interfacial energy with the carbon surface of the sulfur solution is the key to driving complete encapsulation of sulfur. In the penetration of sulfur solutions with N-methyl-2-pyrrolidone, we obtain complete encapsulation of sulfur, even up to 85 wt %. The sulfur fully incorporated cathode achieves remarkably high volumetric capacity and stable cycle property in its Li−S battery applications. We achieve a volumetric capacity of 855 mAh/cm3 at 0.2C and a capacity reduction of 0.071% per cycle up to 300 cycles at 1C. |
