Nitrogen-rich hierarchical porous carbon paper for a free-standing cathode of lithium sulfur battery
| Autor: | Jeongwoo Yang, Jae Hyun Park, Wonyeong Choi, Jae Woo Lee, Hyeonseo Gim, Dohyeun Kim |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Graphene Oxide chemistry.chemical_element Lithium–sulfur battery 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Sulfur Cathode Electrospinning 0104 chemical sciences law.invention chemistry.chemical_compound chemistry Coating Chemical engineering law engineering General Materials Science 0210 nano-technology Porosity |
| Zdroj: | Carbon. 172:624-636 |
| ISSN: | 0008-6223 |
| DOI: | 10.1016/j.carbon.2020.10.078 |
| Popis: | A free-standing cathode without any binder, conductor, and current collector is attractive due to its reduced weight and cost. This study introduces nitrogen-rich and hierarchical porous carbon fibers in the form of a free-standing carbon paper synthesized by NaBH4-aided electrospinning and subsequent CO2 annealing. This modified process leads to a large mesopore volume of 1.007 cm3 g−1 and exposes the nitrogen inside the polymer to the surface of the fiber, resulting in the outstanding surface nitrogen content of 19.38 wt% with abundant pyridinic-N and pyrrolic-N of 16.24 wt% in total surface atoms, while eliminating any further treatment for increasing porosity or coating the polar active sites. The resultant material impregnated by sulfur and filtered by a graphene solution is directly employed as a cathode without any additives. As a result, the capacity is maintained at 696 mAh g−1 up to the 500th cycle at 0.2 C, and 645 mAh g−1 at a high current density of 5.0 C. Even with a high sulfur loading of 6.11 mg cm−2, a remarkable areal capacity of 3.09 mAh cm−2 is recorded after 500 cycles at 0.2 C with the free-standing form preserved. |
| Databáze: | OpenAIRE |
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