Journal
ACS NANO
Volume 14, Issue 12, Pages 17285-17294Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c07332
Keywords
Co9S8@MoS2 heterostructure; Li-S batteries; interlayer; shuttle effect; electochemical performance
Categories
Funding
- National Natural Science Foundation of China [U2032131, 11574273, 11504330]
- Research Starting Foundation of Shaanxi University of Science and Technology [2016XSGG-11, 2016TPJS-07]
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The introduction of a dual-functional interlayer into lithium-sulfur batteries (LSBs) provides many opportunities for restraining the shuttle effect and enhancing sluggish sulfur conversion kinetics. Tuning the band structure of the metal sulfide provides an opportunity to enhance its catalytic activity, which plays an important role in suppressing the shuttle effect of lithium polysulfides (LiPSs) in LSBs. Here were present a Co9S8@MoS2 core-shell heterostructure anchored to a carbon nanofiber (Co9S8@MoS2/CNF), developed as an interlayer for suppressing the shuttle effect of LiPSs. The fabricated composite heterostructure is determined to be an effective alternative material that combines the synergistic relationship between chemisorption and electrochemical catalysis. We find that the band structure of the MoS2 shell can be effectively tuned by the Co9S8 core and that the Co9S8@MoS2/CNF can capture the LiPSs, providing excellent catalytic ability to convert LiPSs into Li2S2, with subsequent transformation from Li2S2 to Li2S. Importantly, high capacities of 1002 and 986 mAh g(-1) can be retained after 50 cycles with high-sulfur loadings of 6 and 10 mg cm(-2). Our results highlight the design of an atomic-scale heterostructure as a multifunctional interlayer providing a synergistic relationship between adsorption and catalysis. The net result is an effective retardation of the shuttling of LiPSs and an enhancement of the electrochemical redox reactions of LiPSs. This work shows great promise toward the development of practical applications of LSBs.
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