Freestanding Mo2C-decorating N-doped carbon nanofibers as 3D current collector for ultra-stable Li-S batteries
| Autor: | Xin Wang, Zhenyu Wang, Chaoqun Shang, Mingyang Yang, Guofu Zhou, Minchan Li, Zhouguang Lu, Lujie Cao |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Carbon nanofiber Energy Engineering and Power Technology chemistry.chemical_element Nanoparticle 02 engineering and technology Current collector 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences chemistry Chemical engineering Nanofiber Electrode General Materials Science Lithium 0210 nano-technology Faraday efficiency |
| Zdroj: | Energy Storage Materials. 18:375-381 |
| ISSN: | 2405-8297 |
| DOI: | 10.1016/j.ensm.2018.08.013 |
| Popis: | The shuttle effect in Li-S batteries caused by high solubility of lithium polysulfides (LiPSs) results in rapid capacity decay and low Coulombic efficiency. To address these issues, we propose a strategy to suppress the shuttle effect by constructing freestanding N-doped carbon nanofibers with well-distributed conductive Mo2C nanoparticles (Mo2C-NCNFs) as 3D current collectors for Li-S batteries. DFT calculations demonstrate that the Mo2C possesses strong and stable adsorption affinity to LiPSs, thus effectively alleviating the shuttle effect. The 3D interconnected nanofibers possess the advantages of high electronic conductivity, structural integrity, fast electrochemical reaction kinetics, and very few dead volumes from inactive additives. As a result, a promising electrochemical performance with a good combination of high specific capacity of 1086 mAh g−1 at 0.2 C, extremely stable cycling performance of over 250 cycles without obvious capacity fading. This strategy is enlightening in designing high performance electrodes for Li-S batteries. |
| Databáze: | OpenAIRE |
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