Microporous Carbon Polyhedrons Encapsulated Polyacrylonitrile Nanofibers as Sulfur Immobilizer for Lithium-Sulfur Battery
| Autor: | Xue-Ping Gao, Zhen-Zhen Wu, Gui-Ling Pan, Ye-Zheng Zhang, Sheng Liu |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Polyacrylonitrile chemistry.chemical_element Lithium–sulfur battery 02 engineering and technology Microporous material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Sulfur Electrospinning 0104 chemical sciences chemistry.chemical_compound chemistry Chemical engineering Nanofiber General Materials Science Composite material 0210 nano-technology Carbon Faraday efficiency |
| Zdroj: | ACS applied materialsinterfaces. 9(14) |
| ISSN: | 1944-8252 |
| Popis: | Microporous carbon polyhedrons (MCPs) are encapsulated into polyacrylonitrile (PAN) nanofibers by electrospinning the mixture of MCPs and PAN. Subsequently, the as-prepared MCPs-PAN nanofibers are employed as sulfur immobilizer for lithium–sulfur battery. Here, the S/MCPs-PAN multicomposites integrate the advantage of sulfur/microporous carbon and sulfurized PAN. Specifically, with large pore volume, MCPs inside PAN nanofibers provide a sufficient sulfur loading. While PAN-based nanofibers offer a conductive path and matrix. Therefore, the electrochemical performance is significantly improved for the S/MCPs-PAN multicomposite with a suitable sulfur content in carbonate-based electrolyte. At the current density of 160 mA g–1sulfur, the S/MPCPs-PAN composite delivers a large discharge capacity of 789.7 mAh g–1composite, high Coulombic efficiency of about 100% except in the first cycle, and good capacity retention after 200 cycles. In particular, even at 4 C rate, the S/MCPs-PAN composite can still release t... |
| Databáze: | OpenAIRE |
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