Abstract
Lithium-sulfur batteries are the extremely promising next generation lithium-ion batteries, but solving the shuttle effect of polysulfide is challenging. Here, the polyethylene glycol@MoO3/carbon nanotubes/S composite（PEG@MoO3/CNTs/S）is prepared in this paper. PEG can trap polysulfides and suppress the shuttle effect. Meanwhile, the polar MoO3 can effectively limit the transfer of polysulfides by chemisorption. Furthermore, the CNTs with the excellent electrical conductivity and mechanical properties is used as the substrate in lithium-sulfur batteries. The 2.5-PEG@MoO3/CNTs/S (2.5 refers to percentage of PEG coated) cathode exhibits a high initial discharge capacity (1327.4 mAh g−1 at 0.1C), an outstanding cycling stability (capacity fading rate of 0.067% per cycle at 0.5C over 800 cycles) and an excellent rate performance (899.1 mAh g−1 at 1C).
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