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Systematic Study of Effect on Enhancing Specific Capacity and Electrochemical Behaviors of Lithium–Sulfur Batteries
Advanced Energy Materials ( IF 27.8 ) Pub Date : 2017-09-14 , DOI: 10.1002/aenm.201701330
Junhao Zhang 1, 2 , Man Huang 1, 2 , Baojuan Xi 2 , Kan Mi 2 , Aihua Yuan 1 , Shenglin Xiong 2
Affiliation  

Herein, a flexible method is designed to engineer nitrogen‐doped carbon materials (NC) with different functional and structural specialties involving N‐doping level, graphitization, and surface area via tuning the carbonization temperature of the pre‐prepared zeolitic imidazolate framework‐8 (ZIF‐8 ) crystals. With the aim to unveil the effect of these features on the electrochemical performance of sulfur cathode, these samples are evaluated as sulfur host and comprehensively investigated. NC‐800 (800 °C, 10.45%N, 1032.4 m2 g−1) exhibits the best electrochemical capability comparing with NC‐700 (700 °C, 16.59%N, 891.4 m2 g−1) and NC‐900 (900 °C, 7.59%N, 987.6 m2 g−1). High surface area and N‐doping can work together to well increase the capacity of sulfur cathode, thanks to the improved transportation of charge carriers and effective anchoring of active sulfur, while the latter specialty just makes sulfur cathode have decent capacity in case of low surface area. Graphitization and quaternary nitrogen favorably improve the electric conductivity of the electrode, empowering the improvement of discharge capacity initially and rendering the good cyclability cooperatively relying on the effective immobilization of active materials. The related results suggest the significance of rational design of carbon maxtrix for sulfur to improve the performance of Li‐S batteries.

中文翻译:

对提高锂硫电池比容量和电化学行为的影响的系统研究

本文设计了一种灵活的方法,通过调节预先制备的沸石咪唑酸盐骨架8的碳化温度来设计具有不同功能和结构特性(包括N掺杂水平,石墨化和表面积)的氮掺杂碳材料(NC)。 ZIF-8)晶体。为了揭示这些特征对硫阴极电化学性能的影响,将这些样品作为硫基质进行评估并进行了全面研究。与NC-700(700°C,16.59%N,891.4 m 2 g -1)和NC-900(700°C,16.59%N,891.4 m 2 g -1)相比,NC‐800(800°C,10.45%N,1032.4 m 2 g -1)具有最佳的电化学性能900°C,7.59%N,987.6 m 2 g -1)。高表面积和N掺杂可以一起工作,从而大大提高了硫阴极的容量,这要归功于电荷载流子的改善和活性硫的有效锚固,而后者的特长恰好使硫阴极在低表面情况下具有不错的容量。区域。石墨化和季氮有利地改善了电极的电导率,使初始放电容量得以提高,并依靠有效地固定活性材料而协同提供了良好的可循环性。相关结果表明,合理设计硫磺最大碳含量对改善Li-S电池性能具有重要意义。
更新日期:2017-09-14
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