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首页> 外文期刊>RSC Advances >Construction of ultrathin MnO2 decorated graphene/carbon nanotube nanocomposites as efficient sulfur hosts for high-performance lithium–sulfur batteries
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Construction of ultrathin MnO2 decorated graphene/carbon nanotube nanocomposites as efficient sulfur hosts for high-performance lithium–sulfur batteries

机译：超薄MnO2装饰的石墨烯/碳纳米管纳米复合材料的构建，可作为高性能锂硫电池的有效硫主体

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摘要

Lithium–sulfur batteries are attracting significant attention due to their high theoretical specific capacity and low cost. However, their applications are hindered by the poor conductivity of sulfur and capacity fading caused by the shuttle effect. Here, ultrathin manganese dioxide decorated graphene/carbon nanotube nanocomposites are designed as sulfur hosts to suppress the shuttle effect and improve the adsorption efficiency of polysulfides. The graphene/carbon nanotube hybrids, with extraordinary conductivity and large surface area, function as excellent channels for electron transfer and lithium ion diffusion. The ultrathin manganese dioxide nanosheets enable efficient chemical interaction with polysulfides and promote the redox kinetics of polysulfides. As a result, an ultrathin manganese dioxide decorated graphene/carbon nanotube sulfur composite with high sulfur content (81.8 wt%) delivers a high initial specific capacity of 1015.1 mA h g ~(?1) at a current density of 0.1C, high coulombic efficiency approaching 100% and high capacity retention of 84.1% after 100 cycles. The nanocomposites developed in this work have promising applications in high-performance lithium–sulfur batteries.
机译：锂硫电池由于其较高的理论比容量和低成本而备受关注。然而，它们的应用受到硫的导电性差和由穿梭效应引起的容量衰减的阻碍。在这里，超薄二氧化锰装饰的石墨烯/碳纳米管纳米复合材料被设计为硫主体，以抑制穿梭效应并提高多硫化物的吸附效率。石墨烯/碳纳米管杂化物具有非凡的导电性和大的表面积，是电子转移和锂离子扩散的极佳通道。超薄二氧化锰纳米片能够与多硫化物进行有效的化学相互作用，并促进多硫化物的氧化还原动力学。结果，高硫含量（81.8 wt％）的超薄二氧化锰装饰石墨烯/碳纳米管硫复合物在0.1C的电流密度下具有1015.1 mA hg〜（？1）的高初始比容量，具有高库仑效率接近100％，并在100个循环后保持84.1％的高容量。在这项工作中开发的纳米复合材料在高性能锂硫电池中具有广阔的应用前景。

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