Electrochemical performance of SnS-SnS2@CNTs composites as anode materials for Sodium ion batteries

Tin sulfide based materials are attracting attention because of excellent performance as SIBs anode. However, SnS and SnS2 suffer from severe capacity degradation during the charge/discharge process, as well as high volume expansion, which prevents superior cycling stability of SIBs. In this work, carbon nanotubes (CNTs) modified SnS-SnS2 materials were prepared by a facile one-step solvothermal approach. The constructed SnS-SnS2 heterostructures have a special internal electric field that promotes charge transfer. The combination of CNTs also prevents agglomeration of active particles and improves the capacity and cycling durability of SIBs (413 mAh·g−1 after 50 cycles).