Li–S batteries have attracted enormous interest due to their potentially high energy density, non-toxicity and the low cost of sulfur. The main challenges of sulfur cathodes are the short cycling life and limited power density caused by the low conductivity of sulfur and dissolution of Li polysulfides. Here we design a new double-hierarchical sulfur host to address these problems. Hierarchical carbon spheres (HCSs), constructed from building blocks of hollow carbon nanobubbles for loading sulfur, are sealed within a thin, polar MoS₂ coating composed of ultrathin nanosheets. Experimental and theoretical studies show a strong absorption of the MoS₂ nanoshell to polysulfides, and the excellent stability of the MoS₂ nanosheets after the adsorption of polysulfides. Moreover, MoS₂ promotes the electrochemical redox kinetics in Li–S batteries. Benefiting from the unique hierarchical, hollow and compositional characteristics of the host, the S/MoS₂@HCS composite electrode shows a high capacity of 1048 mA h g⁻¹ at 0.2C, good rate capacity and long cycling life with a slow capacity decay of 0.06% per cycle.

中文翻译：

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用于高级锂硫电池的高效双层次硫主体

Li-S电池因其潜在的高能量密度，无毒和低硫成本而引起了极大的兴趣。硫阴极的主要挑战是循环寿命短和功率密度低，这是由于硫的电导率低和多硫化锂的溶解造成的。在这里，我们设计了一个新的双层次硫磺宿主来解决这些问题。由中空碳纳米气泡的构建基块构造的用于装载硫的分层碳球（HCS）密封在由超薄纳米片组成的极性极性MoS ₂薄涂层内。实验和理论研究表明所述MOS的强吸收₂纳米壳，以多硫化物，和MOS的优异的稳定性₂纳米片吸附多硫化物后。此外，MoS _2可以促进Li-S电池的电化学氧化还原动力学。得益于主体独特的分层，中空和组成特性，S / MoS ₂ @HCS复合电极在0.2C的条件下显示出1048 mA hg ^-1的高容量，良好的倍率容量和长循环寿命，且容量衰减缓慢。每个周期0.06％。