Heterogeneous WSx/WO3 Thorn-Bush Nanofiber Electrodes for Sodium-Ion Batteries
| Autor: | Xiao Tong, Sungwoo Sohn, Evyatar Shaulsky, Hope Wilson, André D. Taylor, Won-Hee Ryu, Jan Schroers, Jinyang Li, Menachem Elimelech |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Reducing atmosphere General Engineering Oxide General Physics and Astronomy Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Electrospinning 0104 chemical sciences Anode law.invention chemistry.chemical_compound chemistry law Nanofiber Electrode General Materials Science Calcination 0210 nano-technology Dissolution |
| Zdroj: | ACS Nano. 10:3257-3266 |
| ISSN: | 1936-086X 1936-0851 |
| Popis: | Heterogeneous electrode materials with hierarchical architectures promise to enable considerable improvement in future energy storage devices. In this study, we report on a tailored synthetic strategy used to create heterogeneous tungsten sulfide/oxide core-shell nanofiber materials with vertically and randomly aligned thorn-bush features, and we evaluate them as potential anode materials for high-performance Na-ion batteries. The WSx (2 ≤ x ≤ 3, amorphous WS3 and crystalline WS2) nanofiber is successfully prepared by electrospinning and subsequent calcination in a reducing atmosphere. To prevent capacity degradation of the WSx anodes originating from sulfur dissolution, a facile post-thermal treatment in air is applied to form an oxide passivation surface. Interestingly, WO3 thorn bundles are randomly grown on the nanofiber stem, resulting from the surface conversion. We elucidate the evolving morphological and structural features of the nanofibers during post-thermal treatment. The heterogeneous thorn-bush nanofiber electrodes deliver a high second discharge capacity of 791 mAh g(-1) and improved cycle performance for 100 cycles compared to the pristine WSx nanofiber. We show that this hierarchical design is effective in reducing sulfur dissolution, as shown by cycling analysis with counter Na electrodes. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|