Facile synthesis of MoS2/SnS2/NC heterojunction nanosphere composite as high-performance anode material for sodium-ion batteries

SnS2 is considered a potential anode material for sodium-ion batteries (SIBs) due to its high theoretical capacity, abundant resources and non-toxic properties. However, the low Na+ diffusion kinetics and large volume expansion of SnS2 hinder further development and application. Hence, the heterostructured MoS2/SnS2/NC nanospheres are synthetized through a facile hydrothermal reaction. By coating SnS2 on MoS2 templates, the heterojunction composite MoS2/SnS2/NC combines the advantages of the highly stable nanosphere structure of MoS2 and the high theoretical capacity of SnS2. In conclusion, it delivers a high specific capacity of 603 mAh g-1 at 10 A g-1 after 2000 cycles and excellent rate performance of 750 mAh g-1 at 0.1 A g-1. Furthermore, the full battery of MoS2/SnS2/NC= |Na3V2(PO4)3 exhibits a great capacity of 69.8 mAh g-1 at 100 mA g-1 after 100 cycles. The excellent electrochemical performance of the heterojunction material proves it to be an extraordinary anode material for SIBs.

Automated summary

SnS2 is a potential anode material for SIBs due to its high theoretical capacity, abundant resources, and non-toxic properties. However, its low Na+ diffusion kinetics and large volume expansion hinder its further development. By synthesizing heterostructured MoS2/SnS2/NC nanospheres, which combine the stability of MoS2 and the capacity of SnS2, a high specific capacity of 603 mAh g-1 at 10 A g-1 and excellent rate performance of 750 mAh g-1 at 0.1 A g-1 are achieved. Furthermore, the full battery of MoS2/SnS2/NC= |Na3V2(PO4)3 exhibits a great capacity of 69.8 mAh g-1 at 100 mA g-1 after 100 cycles, indicating the extraordinary anode material for SIBs.