A novel one‐step reaction sodium‐sulfur battery with high areal sulfur loading on hierarchical porous carbon fiber
| Autor: | Qiubo Guo, Chenglin Yan, Xuejun Liu, Hongshen Zhang, Hui Xia, Keun‐il Kim, Shuo Sun |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
TK1001-1841
Materials science high areal capacity ultramicropores Renewable Energy Sustainability and the Environment Materials Science (miscellaneous) chemistry.chemical_element One-Step Sulfur Sodium–sulfur battery room temperature sodium‐sulfur batteries Production of electric energy or power. Powerplants. Central stations chemistry Chemical engineering Materials Chemistry Hierarchical porous hierarchical porous carbon fiber Energy (miscellaneous) |
| Zdroj: | Carbon Energy, Vol 3, Iss 3, Pp 440-448 (2021) |
| ISSN: | 2637-9368 |
| DOI: | 10.1002/cey2.86 |
| Popis: | Room temperature sodium‐sulfur (RT Na‐S) batteries are gaining extensive attention as attractive alternatives for large‐scale energy storage, due to low cost and high abundancy of sodium and sulfur in nature. However, the dilemmas regarding soluble polysulfides (Na2S n , 4 ≤ n ≤ 8) and the inferior reaction kinetics limit their practical application. To address these issues, we report the activated porous carbon fibers (APCF) with small sulfur molecules (S2 – 4) confined in ultramicropores, to achieve a reversible single‐step reaction in RT Na‐S batteries. The mechanism is investigated by the in situ UV/vis spectroscopy, which demonstrates Na2S is the only product during the whole discharge process. Moreover, the hierarchical carbon structure can enhance areal sulfur loading without sacrificing the capacity due to thorough contact between electrolyte and sulfur electrode. As a consequence, the APCF electrode with 38 wt% sulfur (APCF‐38S) delivers a high initial reversible specific capacity of 1412 mAh g−1 and 10.6 mAh cm−2 (avg. areal sulfur loading: 7.5 mg cm−2) at 0.1 C (1 C = 1675 mA g−1), revealing high degree of sulfur utilization. This study provides a new strategy for the development of high areal capacity RT Na‐S batteries. |
| Databáze: | OpenAIRE |
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