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-doped mesoporous 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.
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