College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China.
Dalton Trans. 2019 Feb 7;48(5):1906-1914. doi: 10.1039/c8dt04158j. Epub 2019 Jan 18.
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.
BiS 是一种很有前途的用于锂存储的负极材料，因为它具有很高的理论容量。然而，BiS 在经过多次锂循环后容量衰减非常快。在这里，通过一种新方法成功合成了 BiS 和 BiS/C。硫粉作为一种硫源与一种基于铋和均苯三甲酸的金属有机骨架反应-Bi(BTC)(DMF)·DMF·(CHOH)(表示为 Bi-BTC)。均苯三甲酸进一步充当了一种新型的碳源，用于合成 BiS/C 复合材料。复合材料的颗粒尺寸小于纯 BiS，表明 BiS 聚集得到了抑制。对锂离子电池中 BiS 和 BiS/C 复合材料的充放电性能和循环性能进行了测量。具体而言，在 100 mA g 下经过 100 次循环后，BiS/C 和 BiS 的比容量分别达到了 765 和 603 mA h g。由于其高容量和优异的循环寿命，BiS/C 是一种很有前途的储能材料。
