Synthesis of TiO2/S@PPy composite for chemisorption of polysulfides in high performance Li-S batteries
| Autor: | Lihua Liu, Qiujuan Kuang, Hailiang Yuan, Haishen Song, Zhian Zhang, Anping Tang, Hezhang Chen, Guorong Xu |
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| Rok vydání: | 2020 |
| Předmět: |
Battery (electricity)
Materials science Composite number chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences Sulfur 0104 chemical sciences Chemical engineering chemistry Chemisorption General Materials Science Lithium Electrical and Electronic Engineering 0210 nano-technology Mesoporous material Dissolution |
| Zdroj: | Journal of Solid State Electrochemistry. 24:997-1006 |
| ISSN: | 1433-0768 1432-8488 |
| DOI: | 10.1007/s10008-020-04564-8 |
| Popis: | The commercial application of lithium-sulfur (Li-S) battery is hampered by the insulating characteristic and dissolution problem of sulfur and lithium polysulfides. Herein, a mesoporous TiO2@PPy material has been fabricated to act as the chemical immobilizer for sulfur species in Li-S battery. In the structure, PPy layer is covered uniformly on surface of the mesoprous TiO2, forming a core-shell structure. The well-developed mesopores act as the reservoir for sulfur, while the PPy layer improves the conductivity of material and further prevents diffusion of soluble polysulfides. The synthesized TiO2/S@PPy composite delivers an improved rate capability and cycling stability, with an initial discharge specific capacity of 1013.7 mAh g−1 at 0.1 C. In addition, the composite reserves a high capacity of 567.0 mAh g−1 after 300 cycles at 0.5 C, with a decreasing rate of 0.103% per cycle. |
| Databáze: | OpenAIRE |
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