A synergistic Bi2S3/MXene composite with enhanced performance as an anode material of sodium-ion batteries

Abstract

The electrochemical performance of a material is largely impeded by the size and conductivity of the material. To overcome the defects, high-capacity nanoscale Bi₂S₃ particles and highly conductive Ti₃C₂T_x sheets have been composited and applied to sodium-ion batteries for the first time. The Bi₂S₃ nanoparticles are uniformly anchored on the MXene sheets, forming a sandwich-like stereochemical structure, which can alleviate the volume expansion and agglutination, reduce sodium ion migration path, and increase the active areas. Furthermore, the MXene nanosheets provide a conductive skeleton and accelerate the sodium ion and electron transition. Benefiting from the synergistic effect of the Bi₂S₃ nanoparticles on the MXene flakes, the Bi₂S₃/MXene composite exhibits excellent electrochemical properties for sodium-ion batteries.