Enhanced polysulfides adsorptions on CNTs/Boron Nitride fibers for excellent Li-S Battery.,Chemistry - A European Journal

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Enhanced polysulfides adsorptions on CNTs/Boron Nitride fibers for excellent Li-S Battery.
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2020-09-23 , DOI: 10.1002/chem.202003807
Mengyuan Li _{1,

2} , Kun Fu _{1,

2} , Zhixuan Wang ₁ , Chaochao Cao _{1,

2} , Jingwen Yang _{1,

2} , Qinghong Zhai _{1,

2} , Zheng Zhou _{1,

2} , Jiawei Ji _{1,

2} , Yanming Xue _{1,

2} , Chengchun Tang _{1,

2}

Affiliation

Lithium‐sulfur (Li‐S) batteries are one of the most promising high‐energy‐density storage systems. However, serious capacity attenuation and poor cycling stability induced by the shuttle effect of polysulfide intermediates can impede the practical application of Li‐S batteries. Herein we report a novel sulfur cathode by intertwining multi‐walled carbon nanotubes (CNTs) and porous boron nitride fibers (BNFs) for the subsequent loading of sulfur. This structural design enables trapping of active sulfur and serves to localize the soluble polysulfide within the cathode region, leading to low active material loss. Compared with CNTs/S, CNTs/BNFs/S cathodes deliver a high initial capacity of 1222 mAh g⁻¹ at 0.1 C. Upon increasing the current density to 4 C, the cell retained a capacity of 482 mAh g⁻¹ after 500 cycles with a capacity decay of only 0.044 % per cycle. The design of CNTs/BNFs/S gives new insight on how to optimize cathodes for Li‐S batteries.

中文翻译：

增强的多硫化物在CNTs /氮化硼纤维上的吸附，从而形成出色的Li-S电池。

锂硫（Li‐S）电池是最有前途的高能量密度存储系统之一。但是，由于多硫化物中间体的穿梭效应引起的严重容量衰减和较差的循环稳定性会阻碍Li-S电池的实际应用。在本文中，我们通过缠结多壁碳纳米管（CNT）和多孔氮化硼纤维（BNF）来随后装载硫的方法，报告了一种新颖的硫阴极。这种结构设计能够捕获活性硫，并有助于将可溶性多硫化物定位在阴极区域内，从而降低了活性物质的损失。与CNTs / S相比，CNTs / BNFs / S阴极在0.1 C时提供了1222 mAh g ^-1的高初始容量。将电流密度提高到4 C后，电池保留了482 mAh g ^-1的容量500次循环后，每个循环的容量衰减仅为0.044％。CNT / BNFs / S的设计为如何优化Li-S电池阴极提供了新见解。

更新日期：2020-09-23

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