Journal
JOURNAL OF POWER SOURCES
Volume 435, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.226707
Keywords
Lithium-sulfur batteries; Tantalum oxide; Heterogeneous catalyst; Polysulfide; Coated separator
Funding
- National Research Foundation [2018R1A2A1A05079375, 2018M1A2A2063167, 2017R1A4A1015533, 2015M1A2A2056556, 2014M1A8A1049348]
- Korea Institute of Science and Technology [2E29641]
- National Research Foundation of Korea [2018M1A2A2063167, 2018R1A2A1A05079375] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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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