Self-Templated Formation of Interlaced Carbon Nanotubes Threaded Hollow Co 3 S 4 Nanoboxes for High-Rate and Heat-Resistant Lithium-Sulfur Batteries.

Lithium-sulfur batteries (Li-S) have attracted soaring attention due to the particularly high energy density for advanced energy storage system. However, the practical application of Li-S batteries still faces multiple challenges, including the shuttle effect of intermediate polysulfides, the low conductivity of sulfur and the large volume variation of sulfur cathode. To overcome these issues, here we reported a self-templated approach to prepare interconnected carbon nanotubes inserted/wired hollow Co3 S4 nanoboxes (CNTs/Co3 S4 -NBs) as an efficient sulfur host material. Originating from the combination of three-dimensional CNT conductive network and polar Co3 S4 -NBs, the obtained hybrid nanocomposite of CNTs/Co3 S4 -NBs can offer ultrahigh charge transfer properties, and efficiently restrain polysulfides in hollow Co3 S4 -NBs via the synergistic effect of structural confinement and chemical bonding. Benefiting from the above advantages, the S@CNTs/Co3 S4 -NBs cathode shows a significantly improved electrochemical performance in terms of high reversible capacity, good rate performance, and long-term cyclability. More remarkably, even at an elevated temperature (50 °C), it still exhibits high capacity retention and good rate capacity.