Improving electrochemical properties of Lithium–Sulfur batteries by adding a catalyst-embedded interlayer
| Autor: | Byung Dae Son, Sung Man Cho, Byung Hyuk Kim, Woo Young Yoon, Ki Yoon Bae, Sung Ho Cho |
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| Rok vydání: | 2019 |
| Předmět: |
Battery (electricity)
Materials science General Chemical Engineering chemistry.chemical_element 02 engineering and technology Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences Catalysis law.invention chemistry.chemical_compound chemistry Chemical engineering Transmission electron microscopy law 0210 nano-technology Cobalt Polysulfide Palladium |
| Zdroj: | Electrochimica Acta. 315:33-40 |
| ISSN: | 0013-4686 |
| Popis: | To improve lithium–sulfur (Li–S) battery performance, a new interlayer film of embedded palladium cobalt (Pd3Co) particles is developed. Pd3Co particles on multi-walled carbon nanotubes (MWCNTs) are synthesized by using a modified polyol method. The synthesis of Pd3Co on MWCNTs is confirmed by X-ray diffraction, transmission electron microscopy and energy-dispersive X-ray spectroscopy. The interlayer film is prepared through a filtration method using these powders. Li–S batteries with this interlayer have electrochemical properties superior to those with an MWCNT interlayer (0.2, 0.5, and 2.0 C-rates). At 0.2 and 0.5 C-rates, Pd3Co/MWCNT-interlayer cell achieves a better performance than MWCNT-interlayer cell during 200 cycles. In addition, there is a definite performance difference for 2.0 C-rate during 300 cycles. The discharge capacities for the first and 300 cycles for the MWCNT-interlayer cell are 869 mAh g−1 and 525 mAh g−1, respectively, whereas those for a Pd3Co/MWCNT-interlayer cell are 953 mAh g−1 and 752 mAh g−1, respectively. These improvements are resulted from the catalytic role of Pd3Co, which assists the reaction of polysulfide formation/deformation. |
| Databáze: | OpenAIRE |
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