三维石墨烯包覆的硫掺杂碳负载二硫化硒复合材料的制备及其储锂性能研究

3D Graphene Wrapped Selenium Disulfide-Impregnated Sulfur-Doped Mesoporous Carbon Composite with Enhanced Lithium Storage Performance

二硫化硒(SeS2)作为储锂的正极材料,具有硒和硫以外的独特优势。采用硫掺杂介孔碳(sulfur-dopedmesoporous carbon,SMC)负载SeS2,然后用三维石墨烯(three-dimensional grapheme,3DG)对其进行包覆,制备了双重限定的SeS2基正极结构。通过透射电子显微镜(transmission electron microscope,TEM),扫描电子显微镜(scanning electron microscopy,SEM)以及X射线衍射(X-ray diffraction,XRD)对所制备的3DG-SMC-SeS2纳米复合材料的形态和结构进行表征。结果显示,SeS2均匀地分布在SMC基体的介孔通道中,3DG良好地包裹SMC-SeS2复合材料。受益于SeS2不可或缺的优势和独特设计的主体构架,3DG-SMC-SeS2正极表现出极好的循环性能和优异的高倍率性能。这种新型SeS2基正极材料为克服目前锂硫电池的主要瓶颈提供了一种可行的策略。

Selenium disulfide(SeS2)exhibits unique advantages beyond selenium and sulfur as cathode materials for lithium storage.Herein,a dual-confined SeS2-based cathode configuration by encapsulating SeS2 in sulfur-doped mesoporous carbon(SMC)followed by 3D graphene(3DG)wrapping was proposed.The morphology and structure of the as-prepared 3DG-SMC-SeS2 nanocomposite were characterized by transmission electron microscope(TEM),scanning electron microscopy(SEM),and X-ray diffraction(XRD)technique.The results showed that SeS2 was uniformly distributed in the mesoporous channels of SMC matrix,and the SMC-SeS2 composite was well wrapped by the 3DG.Benefiting from the indispensable advantages of SeS2 and the uniquely designed host architecture,the 3DG-SMC-SeS2 composite cathode exhibited excellent cycling performance,accompanied by outstanding high rate capability.This novel SeS2-based cathode material provides a feasible strategy to surmount the main bottlenecks of current lithium-sulfur batteries.