Polypyrrole-modified carbon nanotubes@manganese dioxide@sulfur composite for lithium–sulfur batteries
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Lithium–sulfur (Li–S) battery is one of the most promising next-generation energy storage devices due to its high-capacity density and low cost. However, lithium–sulfur batteries could not be widely used in a large range due to the “shuttle effect” and sulfur insulation. Herein, we proposed a novel composite cathode of carbon nanotubes@manganese dioxide@sulfur@polypyrrole (C@MnO2@S@PPy). X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscopy (TEM) BET analysis show that sulfur filled into the pores of C@MnO2, and PPy was successfully coated on C@MnO2@S. TG indicated that the compound contained 60 wt% active sulfur. The prepared cathode of C@MnO2@S@PPy composites shows excellent rate performance and cycle stability. At a high rate of 1C, its maximum discharge capacity reached 1218 mA h g-1 and its average capacity decreasing rate was only 0.096%/cycle when running over 500 cycles. The interaction mechanism of MnO2 with polysulfides was investigated by adsorption tests and XPS analysis. The excellent electrochemical performance might be due to a combination of adsorption or catalytic properties of MnO2 and the conductivity of carbon materials and PPy.
KeywordsPolypyrrole Manganese dioxide Carbon nanotube Electrochemical performance Lithium–sulfur batteries
This work was supported by the Graduate Freedom Exploration Project Fund of the central south university (no. 502211850).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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