MnSb2S4 nanorods linked with interconnected reduced graphene oxide as high-performance anode for sodium ion batteries

Abstract

Metal sulfides with high theoretical capacities have gradually gained attention as preferable anode materials for sodium ion batteries (SIBs). In this study, for the first time, MnSb2S4 nanorods linked with interconnected reduced graphene oxide (n-MnSb2S4/rGO) is designed as high-performance anode material for SIBs. Ex-situ X-ray powder diffractometer, cyclic voltammetry and high resolution transmission electron microscopy reveal the electrochemical reaction mechanism between MnSb2S4 and Na ions. Furthermore, the addition of rGO not only reduces the agglomeration of MnSb2S4 nanorods, but also enhances the electronic conductivity of the anode, which greatly improving the sluggish reaction kinetics, poor cycling stability and unsatisfactory rate capability of MnSb2S4 nanorods. Electrochemical test results show that n-MnSb2S4/rGO provides a high reversible capacity of 665.25 mAh g-1 at 200 mA g-1 after 200 cycles. And even at a high current density of 2000 mA g-1, it still shows a discharge capacity of 492.36 mAh g-1 after 700 cycles, and the capacity loss per cycle is only 0.036%. The n-MnSb2S4/rGO with good electrochemical properties is predicted to be a promising bimetallic sulfide for advanced SIBs anodes.