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

Abstract

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.