Facile Synthesis of Bi₂S₃@SiO₂Core-Shell Microwires as High-Performance Anode Materials for Lithium-Ion Batteries

Anode materials with high capacity are urgently required to substitute graphite. The theoretical gravimetric and volumetric capacities of Bi 2 S 3 are much higher than those of graphite, but the cycling performance of Bi 2 S 3 is poor due to its large volumetric expansion. Amorphous SiO 2 is mechanically rigid, which can buffer the volume change. A novel Bi 2 S 3 @SiO 2 core-shell microwire is firstly designed and synthesized in this work. The composite exhibits excellent electrochemical performances. The discharge capacity is 379 mA h g −1 after 4000 cycles at the current density of 1 A g −1 .