Enhanced rate capability due to highly active Ta2O5 catalysts for lithium sulfur batteries
The heterogeneous catalysis is widely recognized to promote polysulfide fragmentations can play a key role for the rate capability enhancement of lithium sulfur batteries (LSB). In this study, we report the most active catalysts (Ta2O5) for LSB which showed an enhanced rate capability (914 mAh g−1 a...
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Veröffentlicht in: | Journal of power sources 2019-09, Vol.435, p.226707, Article 226707 |
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Sprache: | eng |
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Zusammenfassung: | The heterogeneous catalysis is widely recognized to promote polysulfide fragmentations can play a key role for the rate capability enhancement of lithium sulfur batteries (LSB). In this study, we report the most active catalysts (Ta2O5) for LSB which showed an enhanced rate capability (914 mAh g−1 at 5 C) in comparison with the previously reported catalysts, TiN (865 mAh g−1 at 5 C). The addition of Ta2O5 into the carbon-coated separator facilitates the chemical disproportionation of reaction intermeditates, Li2S4 into Li2S8 and Li2S effectively, which leads to the greatly lengthened second plateau in discharge profile. The heterogeneous catalysis of Ta2O5 is clearly verified with the UV–Vis spectra directly showing the change of Li2S4 concentration and the battery performance tests without any active elemental sulfur.
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•Heterogeneous catalysts as reaction intermediates can enhance battery performance.•Ta2O5 is one of the most promising heterogeneous catalysts for Li-S battery.•Strong chemical bonding between S and Ta2O5 result in catalytic effect of Ta2O5.•Ta2O5 can accelerate slow disproportionation reaction of LiPS.•Modified separator can help achieving long cycle life and enhanced rate capability. |
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ISSN: | 0378-7753 1873-2755 |
DOI: | 10.1016/j.jpowsour.2019.226707 |