Microstructures and Properties of Honeycomb Sulfur/carbon Black/MoS₂ Composites

Abstract

Microstructure and property of sulfur/carbon black composites prepared by ball milling were studied. Sulfur/carbon black composites were obtained by melting the mixture of sulfur and carbon black in 155 °C and dispersing evenly in carbon black after hydrothermal reaction. Thus, its conductive properties were improved. Moreover, microstructure and property of honeycomb sulfur/carbon black/ MoS₂ prepared by hydrothermal method as a cathode material for lithium-sulfur batteries were studied. The initial discharge specific capacity of the material at 0.2 A/g current density is 838.495 mA·h/g, and the 55.14% after 100 weeks of cycling. It is indicated that MoS₂ can not only combine with polysulfides through electrostatic action or the action of chemical bonds, but also honeycomb porous structure. MoS₂ can fix polysulfides groups and prevent their shuttle. Therefore, the cycling performance of the battery is effectively improved.

Keywords

lithium-sulfur battery / honeycomb MoS₂ / charge/discharge performance

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