| 초록 |
To achieve practical applications of lithium-sulfur batteries (Li-S), nano-structural design plays a key role. Physical encapsulation of sulfur through nano-engineering not only can restrain the issue of lithium polysulfide dissolution, but also can accomplish a high sulfur loading. Nevertheless, it is difficult to realize a high areal capacity with excellent cycling stability. Herein, we investigate an electro-spun carbon nanofiber (CNF) matrix for a sulfur cathode. This simple porous structure exalts the sulfur loading up to 10.5 mg cm−2 with a high reversible capacity and stable cycling. The CNF−sulfur cathode reaches a high areal capacity of > 7 mAh cm−2, which is coupled with good electrical conductivity of intertwined one-dimensional structure. Moreover, we have observed that the reaction products clings well to the intersection of the CNF network, suggesting that the viscous lithium polysulfides are trapped between the narrow gaps in the CNF web during cycling. The results of this study open new avenues for the design of high-areal-capacity Li−S batteries. |
