Synthesis and Electrochemical Properties of a Superior Capacity Bi<sub>2</sub>S<sub>3</sub>@rGO Hybrid Composite Used as an Anode for Lithium-Ion Batteries

Abstract

As the demand for advanced anode materials continues to increase globally, metal sulfides have garnered significant research attention due to their high theoretical capacities and enhanced redox activity, making them promising candidates for lithium-ion batteries (LIBs). However, as a metal sulfide, bismuth sulfide (Bi2S3) faces challenges, such as poor stability and significant volume variation during cycling. This study used a wet chemical method to synthesize bismuth sulfide and subsequently combined it with reduced graphene oxide (rGO) to form a composite material (rGOBS). Electrochemical performance of the rGOBS electrode was then evaluated, showing a high specific capacity of 531-1071.1 mA h g-1 at a current density of 0.2 A g-1 after 350 cycles and a high specific capacity of 378-776.6 mA h g-1 at a current density of 0.5 A g-1 after 500 cycles. Further analysis of the rGOBS electrode revealed insights into its capacitive processes and overpotential. These results provide insight into lithium-ion kinetics using rGOBS electrodes and highlight their potential for advanced LIB applications.