Combination of sulfur hosts with high sulfur loading content and multifunctional additives which can anchor lithium polysulfides and exhibit catalytic properties for polysulfides is an effective way to improve the performance of Li–S batteries and make them more competitive. Herein, we utilize high specific surface area N-doped graphene materials (NGM) as sulfur hosts with high sulfur loading contents reaching 92 wt%. Meanwhile, small amounts of ultrasmall-MoS₂/graphene composites (MoS₂–G) which can act as multifunctional additives to anchor lithium polysulfides and promote their conversion are added into the cathode. Moreover, the ultrasmall-MoS₂ nanoparticles with (100) surfaces can anchor Li₂S₆ strongly by forming Mo–S bonds with a binding energy of 4.19 eV. With the synergistic effects of the NGM sulfur host and the MoS₂–G multifunctional additives, the Li–S batteries displayed stable cycling performance and good rate capability at high sulfur loading content.

中文翻译：

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用于高硫载锂电池的多功能超小型MoS2 /石墨烯复合材料

高硫负载量的硫主体与可以锚定多硫化锂并表现出多硫化物催化性能的多功能添加剂的组合，是提高Li-S电池性能并使其更具竞争力的有效途径。在本文中，我们利用高比表面积的N掺杂石墨烯材料（NGM）作为硫主体，硫含量达到92 wt％。同时，将少量可充当多功能添加剂锚定多硫化锂并促进其转化的超小型MoS ₂ /石墨烯复合物（MoS ₂ -G）添加到阴极中。此外，具有（100）表面的超小型MoS ₂纳米粒子可以锚定Li ₂ S ₆通过形成结合能为4.19 eV的Mo–S键来实现强烈的结合。借助NGM硫主体和MoS ₂ -G多功能添加剂的协同作用，Li-S电池在高硫含量下显示出稳定的循环性能和良好的倍率性能。