A synergistic Bi2S3/MXene composite with enhanced performance as an anode material of sodium-ion batteries†
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 Ti3C2Tx 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.