Metal-Organic Framework-Derived SnS₂/C/CNT as Anode Material for Lithium-Ion Batteries with High Capacity and Stability

SnS2 is considered to be an ideal replacement material for graphite anodes, and has attracted much attention from scientific researchers due to its high theoretical capacity and low cost. However, the application of SnS2 is restricted by its low electrical conductivity and severe volume expansion during cycle. Herein, SnS2/C/CNT material is obtained by high temperature vulcanization and solvent heat treatment with Sn metal-organic framework (MOF) as precursor, while the carbon skeleton of the MOF is preserved. The carbon nanotubes(CNTs) are evenly distributed across the MOF-derived C frameworks to create a carbon network that improves the electrical conductivity of SnS2 and inhibits its volume expansion. Therefore, the modified SnS2/C/CNT anode has still maintained a high discharge capacity of 954.2 mAh g(-1) after 100 cycles at the current density of 200 mA g(-1 )with a high capacity retention rate of 89.3%. It also exhibits excellent rate capability (739.8, 669.1, and 575.8 mAh g(-1) for 0.5, 1, and 2 A g(-1)). In addition, the SnS2/C/CNT material also shows good electrochemical performance even without conductive additives.