Synthesis of rod‐like Sb2Se3@MWCNT as Conductive‐additive free Anode for Sodium‐ion Batteries

Antimony selenide (Sb 2 Se 3 ) is a promising electrode material for sodium‐ion batteries (SIBs) due to its high theoretical capacity. However, volume expansion during sodiation/desodiation and the low conductivity of Sb 2 Se 3 reduce the electrochemical performance. Herein, we synthesized Sb 2 Se 3 nanorods (NRs) and combined them with multi‐walled carbon nanotubes (MWCNTs) using one‐step composite process to address these issues. MWCNTs can accommodate volume expansion and provide high conductivity. The fabricated Sb 2 Se 3 NRs@MWCNT electrode exhibits improved cycle performance and cyclic stability without additional conductive carbons. The Sb 2 Se 3 NRs@MWCNT electrode showed an enhanced specific capacity of 440 mAhg −1 at a current density of 0.1 Ag −1 , compared to 220 mAhg −1 for the Sb 2 Se 3 NRs electrode. Additionally, it exhibited good stability at high current density. The in‐situ electrochemical impedance spectroscopy (EIS) and Galvanostatic intermittent titration technique (GITT) were used to estimate the electrochemical properties and kinetics of Sb 2 Se 3 NRs@MWCNT. These results showed that Sb 2 Se 3 NRs@MWCNT have the potential as a conductive‐free anode material in SIBs.