MoS2 nanosheets grown on hollow carbon spheres as a strong polysulfide anchor for high performance lithium sulfur batteries,Nanoscale

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MoS2 nanosheets grown on hollow carbon spheres as a strong polysulfide anchor for high performance lithium sulfur batteries
Nanoscale ( IF 5.8 ) Pub Date : 2020-10-26 , DOI: 10.1039/d0nr05727d
Miaoran Li _{1,

2,

3,

4,

5} , Huiyuan Peng _{1,

2,

3,

4,

5} , Yang Pei _{1,

2,

3,

4,

5} , Fang Wang _{1,

2,

3,

4,

5} , Ying Zhu _{1,

2,

3,

4,

5} , Ruyue Shi _{1,

2,

3,

4,

5} , Xuexia He _{1,

2,

3,

4,

5} , Zhibin Lei _{1,

2,

3,

4,

5} , Zonghuai Liu _{1,

2,

3,

4,

5} , Jie Sun _{1,

2,

3,

4,

5}

Affiliation

Lithium sulfur batteries are expected to be one of the most promising energy storage systems due to their high energy density, low cost and environmental friendliness. However, the shuttle effect of lithium polysulfides severely hampers their practical application. The design of the sulfur cathode is one of the most important approaches to overcome the problem. In this work, MoS₂ nanosheets have been successfully grown on the surface of hollow carbon spheres (HCS) to obtain MoS₂@HCS nanocomposites with uniform morphology. The growth behavior of MoS₂ nanosheets was also proved by adjusting the pore structure of HCS. With a sulfur loading of 74%, the MoS₂@HCS/S cathode exhibits a high initial reversible capacity of 1419 mA h g⁻¹ at a current density of 0.1 C and remains at 1010 mA h g⁻¹ after 100 cycles. Even at 0.5 C, a capacity of 795 mA h g⁻¹ can be retained after 600 cycles, corresponding to a capacity retention rate of 63.1%. By adjusting the concentration of the sulfur source, the relationship between different growth quantities of MoS₂ and the cycling performance of the battery was also investigated. The excellent electrochemical performance of the MoS₂@HCS/S cathode can be fully attributed to its physical and chemical double adsorption effect on lithium polysulfides, which has been confirmed through the visible adsorption and X-ray Photoelectron Spectroscopy (XPS) experiments. This work provides a simple design concept and method to synthesize a nanocomposite-based sulfur host for high performance lithium sulfur batteries.

中文翻译：

MoS2纳米片生长在空心碳球上，是高性能锂硫电池的强力多硫化物锚点

锂硫电池由于其高能量密度，低成本和环境友好性，有望成为最有前途的储能系统之一。然而，多硫化锂的穿梭效应严重地妨碍了它们的实际应用。硫阴极的设计是克服该问题的最重要方法之一。在这项工作中，MoS ₂纳米片已经成功地在空心碳球（HCS）的表面上生长，以获得具有均匀形态的MoS ₂ @HCS纳米复合材料。通过调节HCS的孔结构也证明了MoS ₂纳米片的生长行为。MoS ₂ @ HCS / S阴极的硫负载量为74％，显示出1419 mA hg的高初始可逆容量^-1在0.1 C的电流密度下，并在100个循环后保持在1010 mA hg^-1。即使在0.5 C下，在600次循环后仍可以保持795 mA hg^-1的容量，对应于63.1％的容量保持率。通过调节硫源的浓度，还研究了MoS_2的不同增长量与电池循环性能之间的关系。MoS₂的出色电化学性能@ HCS / S阴极可完全归因于其对多硫化锂的物理和化学双重吸附作用，这已通过可见吸收和X射线光电子能谱（XPS）实验得到证实。这项工作提供了一个简单的设计概念和方法，以合成用于高性能锂硫电池的纳米复合材料硫主体。

更新日期：2020-11-21

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