| 초록 |
Porous carbon scaffolds have played a key role in the state-of-the-art lithium-sulfur battery (Li-S). The conventional zero-dimensional (0-d) porous carbon particles have been examined extensively to alleviate the performance of the sulfur cathode, but the large contact resistance could not be avoided. Moreover, the previous works had hard time stacking the sulfur to achieve a high active material loading (mg cm-2). To address those obstacles, interwoven one-dimensional (1-d) carbon matrix can mitigate the contact resistance with better electronic path and store large amount of active materials within a porous structure. We herein introduce an electro-spun carbon nanofiber (CNF) sheet as the carbon scaffold as well as the current collector. The ultrahigh amount of the sulfur (10.5 mg cm-2) is loaded in the CNF and effectively be confined during a long-life cycles, which is enabled by suppressed polysulfide dissolution via a capillary action. As a result, a high areal capacity (~8 mAh cm-2) was retained over 100 cycles. The characterization of the materials and the electrochemical measurements are discussed in this presentation. |
