BiS/C nanorods as efficient anode materials for lithium-ion batteries.

BiS is a promising negative electrode material for lithium storage owing to its high theoretical capacity. Nevertheless, the capacity of BiS decays very rapidly upon Li cycling. Here, BiS and BiS/C were successfully synthesized by a novel route. Sulfur powder as a kind of sulfur source reacted with a metal organic framework based on bismuth and trimesinic acid-Bi(BTC)(DMF)·DMF·(CHOH) (denoted as Bi-BTC). Trimesic acid further acted as a new type of carbon source to synthesize the BiS/C composite. The particle sizes of the composite were smaller than those of pure BiS, showing the suppression of BiS aggregation. Charge-discharge performance and cyclability for both the BiS and BiS/C composites in lithium-ion batteries were measured. Specifically, the specific capacities of BiS/C and BiS reached 765 and 603 mA h g, respectively, at 100 mA g after 100 cycles. Because of its high capacity and excellent cycle life, BiS/C is a promising energy storage material.