Multilayer SnS-SnS2@GO heterostructures nanosheet as anode material for Sodium ion battery with high capacity and stability

SnS and SnS 2 are two promising anode materials with excellent theoretical capacity for Sodium ion batteries . However, severe volume collapse and low electric charge conductivity dramatically affect the electrochemical performance of SnS and SnS 2 . As a consequence, SnS-SnS 2 heterostructures are constructed to improve the conductivity of the anode material. The volume effect is prevented by compounding with Graphene Oxide (GO) to ensure cyclic stability and improve the initial coulombic efficiency of anode materials. The first-principles simulation is used to simulate SnS, SnS 2 , SnS-SnS 2 and SnS-SnS 2 @GO respectively, and the comparison is made through actual experiments. Experimental studies indicate that SnS-SnS 2 @GO processes superior conductivity and cycle stability, unique nano-flake structure and the composite modification of GO can restrain the volume effect and ensure long cycle stability of the anode material (450.6 mAh·g −1 after 100 cycles). Moreover, attributing to the p-n heterostructures, the internal charges transfer and improve the electrical conductivity of SnS-SnS 2 can be promoted obviously. Simultaneously, it has been detected that the multilayer SnS-SnS 2 heterostructures combining GO effectively improve the conductivity and ensure good structure stability. Therefore, SnS-SnS 2 @GO composites can be considered as an ideal anode material for sodium ion batteries.