Few-layer MoS 2 promotes SnO 2 @C nano-composites for high performance sodium ion batteries.

Due to its abundance, high theoretical capacity, and environmental benefits, tin dioxide (SnO 2 ) shows great potential as an anode material in sodium-ion batteries (SIBs). However, the inadequate electrical conductivity and significant volume fluctuations during the Na + insertion/extraction process are major limitations to its practical application. Herein, few-layered MoS 2 @SnO 2 @C (FMSC) composites with hierarchical nanostructures were prepared through a two-step hydrothermal method. As expected, the electrochemical tests show that the FMSC exhibits superior electrochemical properties, such as an outstanding rate capability of 288.9 mA h g -1 at a current density of 2 A g -1 , a high reversible capacity of 415.9 mA h g -1 after 50 cycles at a current density of 0.1 A g -1 , and remarkable cycling stability of 158.4 mA h g -1 after 4400 cycles at a current density of 5 A g -1 , as an anode material for SIBs. The exceptional performance can be attributed to the presence of a thin layer of MoS 2 , which enhances surface electrochemical reactions and provides a flexible structure.