High performance sodium-ion anodes based on FeSb2S4/Sb embedded within porous reduced graphene oxide/carbon nanotubes matrix

Sodium-ion battery (SIB) is considered as the most likely representative battery to replace lithium-ion battery (LIB). FeSb 2 S 4 is a promising anode material for SIB with high theoretical capacity and excellent cyclic stability. Nevertheless, Our previous studies have shown that the electrochemical performance of FeSb 2 S 4 was strongly affected by the crystal phase, composition and structural morphology. Therefore, it is meaningful to optimize the electrochemical performance of FeSb 2 S 4 towards practical applications. Herein, FeSb 2 S 4 /Sb/rGO powder with high reversible capacity and improved capacity retention ratio was fabricated by using FeSb 2 S 4 compounded with Sb and rGO. Upon assembling the FeSb 2 S 4 /Sb/rGO powder into 3D discs using the CNTs and rGO as high conductive networks, physical properties of FeSb 2 S 4 /Sb/rGO disc showed that the depositional phase of FeSb 2 S 4 and Sb uniformly distributed in highly porous carbon networks. Electrochemical test results revealed that a high reversible area-specific and mass-specific capacity of 1.2 mAh cm −2 and 174.9 mAh g −1 can be obtained for the FeSb 2 S 4 /Sb/rGO disc with 1.1 mm thickness at 50 cycles and 1.0 A g −1 . This work provides a new strategy for the design of semi-conductive anodes with high-performance for SIB applications.