Enhanced electrochemical performance of sulfur on Y2O3-modified porous carbon aerogels for high performance lithium–sulfur batteries
| Autor: | Zhongqiang Ding, Jingjian Yu, Pei Zhang, Yang Hua, Xueliang Li |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Diffusion
chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Sulfur Catalysis Cathode 0104 chemical sciences law.invention chemistry.chemical_compound Adsorption chemistry Chemical engineering law Materials Chemistry 0210 nano-technology Porosity Carbon Polysulfide |
| Zdroj: | New J. Chem.. 41:12726-12735 |
| ISSN: | 1369-9261 1144-0546 |
| DOI: | 10.1039/c7nj02714a |
| Popis: | Ultrafine Y2O3 modified carbon aerogels (Y-CAs) were successfully fabricated via in situ and sol–gel methods. The Y-CA materials exhibit interconnected porous structures and high adsorption ability. The Y-CA/S composites loaded with sulfur served as cathode materials in lithium–sulfur batteries to suppress the polysulfide diffusion and offer high electrical conductivity during the charge/discharge process. In particular, the designed Y2-CA/S cathode exhibits a high initial discharge capacity of 1369 mA h g−1 and retained 1108 mA h g−1 after 100 cycles at 0.2C. The Y2-CA/S cathode presents a good rate capability of 994 mA h g−1 up to 2C and nice long-term cycling stability with a high reversible capacity of 892 mA h g−1 after 300 cycles at 0.5C. The excellent electrochemical performance of the batteries is attributed to high adsorption ability and the uniform Y2O3 distribution on the porous and interrelated carbon spheres. |
| Databáze: | OpenAIRE |
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