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Encapsulation of Sulfur into N-Doped Porous Carbon Cages by a Facile, Template-Free Method for Stable Lithium-Sulfur Cathode.
Small ( IF 13.0 ) Pub Date : 2020-08-28 , DOI: 10.1002/smll.202001027 Shuaibo Zeng 1 , Gowri Manohari Arumugam 1 , Xianhu Liu 2 , Yuzhao Yang 1 , Xin Li 1 , Hai Zhong 1 , Fei Guo 1 , Yaohua Mai 1
Small ( IF 13.0 ) Pub Date : 2020-08-28 , DOI: 10.1002/smll.202001027 Shuaibo Zeng 1 , Gowri Manohari Arumugam 1 , Xianhu Liu 2 , Yuzhao Yang 1 , Xin Li 1 , Hai Zhong 1 , Fei Guo 1 , Yaohua Mai 1
Affiliation
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Lithium‐sulfur (Li‐S) batteries with a high energy density and long lifespan are considered as promising candidates for next‐generation electrochemical energy‐storage devices. However, the sluggish redox kinetics of electrochemistry and high solubility of polysulfide during cycling render insufficient sulfur utilization and poor cycling stability. Herein, a facile, template‐free procedure based on controlled pyrolysis of polydopamine vesicles is described to prepare N‐doped porous carbon cages (NHSC) as a new sulfur host, which significantly improves both the sulfur utilization and cycling stability. As NHSC shows a high pore volume, continuous electron and ion transport paths, and good catalytic activity, encapsulation of S nanoparticles into NHSC endows the resulting S@NHSC electrode with a good energy storage capacity and exceptionally high electrochemical stability. Consequently, a Li‐S cell with the S@NHSC as the cathode achieves a high initial capacity of 1280.7 mAh g−1, and cycling stability over 500 cycles with the capacity decay as low as 0.0373% per cycle.
中文翻译：
通过一种简便，无模板的方法将硫封装到N掺杂的多孔碳笼中，以稳定锂硫阴极。
具有高能量密度和长寿命的锂硫（Li‐S）电池被认为是下一代电化学储能设备的有希望的候选者。但是，电化学反应迟缓的氧化还原动力学和循环过程中多硫化物的高溶解度导致硫利用率不足和循环稳定性差。本文描述了一种基于聚多巴胺囊泡热解控制的简便，无模板的程序，可将N掺杂的多孔碳笼（NHSC）制备为新的硫主体，从而显着提高硫的利用率和循环稳定性。由于NHSC的孔体积大，电子和离子的传输路径连续且催化活性好，将S纳米颗粒封装到NHSC中，可以使所得的S @ NHSC电极具有良好的储能能力和极高的电化学稳定性。因此，以S @ NHSC为阴极的Li‐S电池可实现1280.7 mAh g的高初始容量-1，并且在500个循环中具有循环稳定性，每个循环的容量衰减低至0.0373％。
更新日期：2020-10-02
中文翻译：
通过一种简便，无模板的方法将硫封装到N掺杂的多孔碳笼中，以稳定锂硫阴极。
具有高能量密度和长寿命的锂硫（Li‐S）电池被认为是下一代电化学储能设备的有希望的候选者。但是，电化学反应迟缓的氧化还原动力学和循环过程中多硫化物的高溶解度导致硫利用率不足和循环稳定性差。本文描述了一种基于聚多巴胺囊泡热解控制的简便，无模板的程序，可将N掺杂的多孔碳笼（NHSC）制备为新的硫主体，从而显着提高硫的利用率和循环稳定性。由于NHSC的孔体积大，电子和离子的传输路径连续且催化活性好，将S纳米颗粒封装到NHSC中，可以使所得的S @ NHSC电极具有良好的储能能力和极高的电化学稳定性。因此，以S @ NHSC为阴极的Li‐S电池可实现1280.7 mAh g的高初始容量-1，并且在500个循环中具有循环稳定性，每个循环的容量衰减低至0.0373％。
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