SnSe2 Nanoparticles Chemically Embedded in a Carbon Shell for High-Rate Sodium-Ion Storage

The development of advanced anode materials is crucial to enhance the performance of sodium-ion batteries (SIBs). In this study, SnSe 2 nanoparticles chemically embedded in a carbon shell (SnSe 2 @C) were fabricated from Sn–organic frameworks and evaluated as an anode material for SIBs. The structural characterization demonstrated that there existed C–Sn chemical bonds between the SnSe 2 nanoparticles and carbon shell, which could strongly anchor SnSe 2 nanoparticles to the carbon shell. Such a structure can not only facilitate charge transfer but also ensure the structural stability of the SnSe 2 @C electrode. In addition, the carbon shell also helped in the dispersion of SnSe 2 nanoparticles, thus offering more redox-active sites for Na + storage. The as-prepared SnSe 2 @C nanocomposite could deliver good cycling stability and a superior rate capability of 324 mA h g –1 at 2 A g –1 for SIBs.