Bamboo-shaped Co@NCNTs as superior sulfur host for Li-S batteries

Functional and active carbon material is of great concern in facilitating the performance of lithium-sulfur (Li-S) battery. In this work, we develop a bamboo-like nitrogen-doped carbon nanotubes ([email protected]) with low cobalt metal content, which acts as not only the host matrix for sulfur loading but also an efficient catalyst for the adsorption and conversion of lithium polysulfides (LiPSs). The characterization results show that the Co particles are mainly encapsulated inside the [email protected], and the N species are mainly distributed on the outer surface of [email protected] The Co particles are the growth sites of carbon nanotubes and are wrapped by carbon to form [email protected] It is confirmed that the uniform graphitized structure contributes to charge transfer, while the enriched N species assist the trap and catalytic conversion of the polysulfides, thus helping to restrain the shuttle effect. As a result, the resultant [email protected] cathode presents high reversible capacity at different current densities and exhibits superior cycling stability for 300 cycles at 0.5 C.