Fabrication of Multiwalled Carbon Nanotube-Wrapped Ultrathin SnS2 Nanoplates and Their Superior Li-Ion Intercalation Performance
Two-dimensional ultrathin SnS2 nanoplates enwrapped into a multiwalled carbon nanotube (MWCNT) network are synthesized by a facile and one-step hydrothermal method with SnCl2∙H2O and thiourea as reactants and sodium dodecylbenzenesulfonate as surfactant. The highly dispersed carbon nanotubes in ethanol solution are found to reduce the thickness of SnS2 nanoplates during their growth and embed them into an interconnected network finally. In lithium-ion battery studies, the electrode fabricated from the SnS2 nanoplate/MWCNT hybrid material delivers excellent lithium-ion intercalation properties, with larger specific capacity, higher rate capability and better cycling stability than that of electrode made of bare SnS2 nanoplates. The improved electrochemical performance is ascribed to a fact that this porous, hybrid architecture effectively accommodates the volume change of SnS2 during charge–discharge to maintain structural stability, facilitates the easy access of electrolyte to the huge surface of nanoscale active materials, and also provides a continuous conductive network to significantly enhance the charge transfer kinetics at electrode.