Rodlike Sb₂Se₃ Wrapped with Carbon: The Exploring of Electrochemical Properties in Sodium-Ion Batteries

One-dimensional Sb 2 Se 3 /C rods are prepared through self-assembly by inducing anisotropy, and their corresponding sodium storage behaviors are evaluated, presenting excellent electrochemical performances with superior cycling stability and rate capability. Sb 2 Se 3 delivers a high initial charge capacity of 657.6 mA h g –1 at a current density of 0.2 A g –1 between 2.5 and 0.01 V. After 100 cycles, the reversible capacity of Sb 2 Se 3 /C is still retained at 485.2 mA h g –1 . Even at a high rate current density of 2.0 A g –1, the charge capacity is still retained at 311.5 mA h g –1 . Through the analysis of cyclic voltammetry and in situ electrochemical impedance spectroscopy, the in-depth understanding of high rate performances is explored effectively. Briefly, the sodium storage performance of Sb 2 Se 3 /C is observably enhanced, benefiting from the 1D structure and the introduction of a carbon layer with robust structure stability and conductivity.