Conductive Nanocrystalline Niobium Carbide as High‐Efficiency Polysulfides Tamer for Lithium‐Sulfur Batteries,Advanced Functional Materials

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Conductive Nanocrystalline Niobium Carbide as High‐Efficiency Polysulfides Tamer for Lithium‐Sulfur Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2017-11-16 , DOI: 10.1002/adfm.201704865
Wenlong Cai ₁ , Gaoran Li ₂ , Kailong Zhang ₁ , Guannan Xiao ₁ , Can Wang ₃ , Kefen Ye ₃ , Zhongwei Chen ₂ , Yongchun Zhu ₁ , Yitai Qian ₁

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Rational design of functional interlayer is highly significant in pursuit of high‐performance Li‐S batteries. Herein, a nanocrystalline niobium carbide (NbC) is developed via a facile and scalable autoclave technology, which is, for the first time, employed as the advanced interlayer material for Li‐S batteries. Combining the merits of strong polysulfides (PS) anchoring with high electric conductivity, the NbC‐coated membrane enables efficiently tamed PS shuttling and fast sulfur electrochemistry, achieving outstanding cyclability with negligible capacity fading rate of 0.037% cycle⁻¹ over 1500 cycles, superb rate capability up to 5 C, high areal capacity of 3.6 mA h cm⁻² under raised sulfur loading, and reliable operation even in soft‐package cells. This work offers a facile and effective method of promoting Li‐S batteries for practical application.

中文翻译：

导电纳米晶碳化铌作为用于锂硫电池的高效多硫化物驯服剂

功能性中间层的合理设计对于追求高性能Li-S电池非常重要。在这里，纳米晶碳化铌（NbC）是通过一种易于使用且可扩展的高压釜技术开发的，该技术首次被用作Li-S电池的高级夹层材料。NbC涂层膜将强力多硫化物（PS）锚固与高电导率的优点结合在一起，可以有效地抑制PS穿梭和快速的硫电化学反应，实现出色的可循环性，在1500个循环中可忽略不计的容量衰减率为0.037％循环^-1，极高的速率最高5 C的能力，3.6 mA h cm ^-2的高面积容量在增加的硫负荷下，即使在软包装电池中也能可靠运行。这项工作提供了一种方便有效的方法来推广Li-S电池以用于实际应用。

更新日期：2017-11-16

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