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

SnS and SnS2 are two promising anode materials with excellent theoretical capacity for Sodium ion bat-teries. However, severe volume collapse and low electric charge conductivity dramatically affect the elec-trochemical performance of SnS and SnS2. As a consequence, SnS-SnS2 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 ma-terials. The first-principles simulation is used to simulate SnS, SnS2, SnS-SnS2 and SnS-SnS2 @GO respec-tively, and the comparison is made through actual experiments. Experimental studies indicate that SnS-SnS2 @GO processes superior conductivity and cycle stability, unique nano-flake structure and the com-posite modification of GO can restrain the volume effect and ensure long cycle stability of the anode ma-terial (450.6 mAhmiddotg-1 after 100 cycles). Moreover, attributing to the p-n heterostructures, the internal charges transfer and improve the electrical conductivity of SnS-SnS2 can be promoted obviously. Simultaneously, it has been detected that the multilayer SnS-SnS2 heterostructures combining GO effec-tively improve the conductivity and ensure good structure stability. Therefore, SnS-SnS2 @GO composites can be considered as an ideal anode material for sodium ion batteries.(c) 2022 Elsevier B.V. All rights reserved.

Automated summary

SnS and SnS2 are two anode materials with excellent theoretical capacity for Sodium ion batteries. However, their electrochemical performance is affected by volume collapse and low electric charge conductivity. The construction of SnS-SnS2 heterostructures improves conductivity, and compounding with Graphene Oxide (GO) prevents volume effects and enhances cyclic stability and initial coulombic efficiency. Experimental and simulation studies show that SnS-SnS2 @GO composites exhibit superior conductivity, cycle stability, and unique nano-flake structure, making them ideal anode materials for sodium ion batteries.