Journal
NANO RESEARCH
Volume 12, Issue 5, Pages 1193-1197Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-019-2381-0
Keywords
Ni-rich phosphides; carbon nanotube; high conductivity; catalytic effect; lithium sulfur battery
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Funding
- National Natural Science Foundation of China [21776041, 21875028]
- Cheung Kong Scholars Programme of China [T2015036]
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Lithium sulfur battery has been identified as a promising candidate for next storage devices attributing to ultrahigh energy density. However, non-conductive nature of sulfur and shuttling effect of soluble lithium polysulfides are intractable remaining problems. Herein, we develop a highly conductive nickel-rich Ni12P5/CNTs hybrid with high specific surface area as sulfur host to address these issues. The polar nature of Ni12P5/CNTs can significantly relieve the shuttle effect by means of a strong affinity towards lithium polysulfides and enhance kinetics of polysulfides redox reactions. In addition, the Ni12P5/CNTs with a superior conductivity (500 Sm-1) and high surface area of 395 m(2)g(-1) enables the effective electron transfer and expedited interfacial reaction. As a result, Ni12P5/CNTs hosted sulfur cathode exhibits high rate capability (784 mAhg(-1) at 4 C) and stable cycling performance with a negligible capacity fading of 0.057 % per cycle over 1,000 cycles at 0.5 C. This work paves an alternative way for designing high performance sulfur cathodes involved metal-rich phosphides.
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