Nitrogen-Doped Carbon Nanotube Forests Planted on Cobalt Nanoflowers as Polysulfide Mediator for Ultralow Self-Discharge and High Areal-Capacity Lithium–Sulfur Batteries,Nano Letters

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Nitrogen-Doped Carbon Nanotube Forests Planted on Cobalt Nanoflowers as Polysulfide Mediator for Ultralow Self-Discharge and High Areal-Capacity Lithium–Sulfur Batteries
Nano Letters ( IF 9.6 ) Pub Date : 2018-11-30 00:00:00 , DOI: 10.1021/acs.nanolett.8b03906
Lianbo Ma ₁ , Huinan Lin ₁ , Wenjun Zhang ₁ , Peiyang Zhao ₁ , Guoyin Zhu ₁ , Yi Hu ₁ , Renpeng Chen ₁ , Zuoxiu Tie ₁ , Jie Liu _{1,

2} , Zhong Jin ₁

Affiliation

Lithium–sulfur (Li–S) batteries with high theoretical energy density have caught enormous attention for electrochemical power source applications. However, the development of Li–S batteries is hindered by the electrochemical performance decay that resulted from low electrical conductivity of sulfur and serious shuttling effect of intermediate polysulfides. Moreover, the areal capacity is usually restricted by the low areal sulfur loadings (1.0–3.0 mg cm^–2). When the areal sulfur loading increases to a practically accepted level above 3.0–5.0 mg cm^–2, the areal capacity and cycling life tend to become inferior. Herein, we report an effective polysulfide mediator composed of nitrogen-doped carbon nanotube (N-CNT) forest planted on cobalt nanoflowers (N-CNTs/Co-NFs). The abundant pores in N-CNTs/Co-NFs can allow a high sulfur content (78 wt %) and block the dissolution/diffusion of polysulfides via physical confinement, and the Co nanoparticles and nitrogen heteroatoms (4.3 at. %) can enhance the polysulfide retention via strong chemisorption capability. Moreover, the planted N-CNT forest on N-CNTs/Co-NFs can enable fast electron transfer and electrolyte penetration. Benefiting from the above merits, the sulfur-filled N-CNTs/Co-NFs (S/N-CNTs/Co-NFs) cathodes with high areal sulfur loadings exhibit low self-discharge rate, high areal capacity, and stable cycling performance.

中文翻译：

种植在钴纳米花上的氮掺杂碳纳米管森林，作为多硫化物介体，可用于超低自放电和高容量锂-硫电池

具有高理论能量密度的锂-硫（Li-S）电池在电化学电源应用中引起了极大的关注。然而，由于硫的低电导率和中间多硫化物的严重穿梭效应导致电化学性能下降，阻碍了Li-S电池的发展。此外，面积容量通常受较低的面积硫负荷（1.0-3.0 mg cm ^-2）限制。当面硫负荷增加到超过3.0–5.0 mg cm ^–2的实际可接受水平时，其区域通行能力和骑车寿命往往会变差。在这里，我们报告了一种有效的多硫化物介体，该介体由种植在钴纳米花（N-CNTs / Co-NFs）上的氮掺杂碳纳米管（N-CNT）森林组成。N-CNTs / Co-NFs中的大量孔可以允许高硫含量（78 wt％）并通过物理限制阻止多硫化物的溶解/扩散，而Co纳米颗粒和氮杂原子（4.3 at。％）可以增强通过强大的化学吸附能力保留多硫化物。此外，在N-CNT / Co-NFs上种植的N-CNT森林可以实现快速的电子转移和电解质渗透。受益于上述优点，具有高面积硫负载的填充硫的N-CNTs / Co-NFs（S / N-CNTs / Co-NFs）阴极表现出低的自放电率，高的面积容量和稳定的循环性能。

更新日期：2018-11-30

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