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Highly Ordered Mesoporous Sulfurized Polyacrylonitrile Cathode Material for High-Rate Lithium Sulfur Batteries
The Journal of Physical Chemistry C ( IF 3.7 ) Pub Date : 2017-11-16 00:00:00 , DOI: 10.1021/acs.jpcc.7b06625
Ying Liu 1 , Anupriya K. Haridas 2 , Kwon-Koo Cho 2 , Younki Lee 2 , Jou-Hyeon Ahn 1, 2
Affiliation  

A highly ordered mesoporous sulfurized polyacrylonitrile (MSPAN) composite has been synthesized via in situ polymerization of polyacrylonitrile (PAN) in an SBA-15 template followed by sulfurization. The synthesized composite possessed high sulfur utilization, high Coulombic efficiency, and excellent cycling stability as a cathode active material for high-rate lithium sulfur (Li–S) batteries. A highly ordered mesoporous structure was observed in the MSPAN composite from transmission electron microscopy. Excellent electrochemical and stable cycling performances of the MSPAN composite were obtained, especially at high C rates. The capacity retention of the MSPAN cell was 755 mAh g–1 after 200 cycles at 1 C and 610 mAh g–1 after 900 cycles at 2 C. Even at a higher rate of 5 C, the composite showed reasonable capacity retention. The superior performance of the MSPAN composite was attributed to its highly porous structure, which could effectively improve the wettability, accessibility, and absorption of electrolyte, facilitating rapid ion transfer in Li–S batteries. The electrochemical results demonstrate that the highly ordered mesoporous MSPAN composite is a promising cathode active material for advanced Li–S batteries.

中文翻译:

高速率锂硫电池的高介孔介孔硫化聚丙烯腈阴极材料

通过SBA-15模板中原位聚合聚丙烯腈(PAN),然后进行硫化,合成了高度有序的中孔硫化聚丙烯腈(MSPAN)复合材料。合成的复合材料具有高硫利用率,高库仑效率和出色的循环稳定性,可作为高倍率锂硫(Li–S)电池的正极活性材料。从透射电子显微镜观察到的MSPAN复合材料中观察到高度有序的介孔结构。MSPAN复合材料具有出色的电化学性能和稳定的循环性能,尤其是在高C速率下。所述MSPAN电池的容量维持率为755毫安克-1 1 C 200个循环和610后毫安克-1在2 C下900次循环后。即使以更高的5 C速率,复合材料也显示出合理的容量保持率。MSPAN复合材料的优异性能归因于其高度多孔的结构,可有效改善电解质的润湿性,可及性和吸收性,从而促进Li-S电池中离子的快速转移。电化学结果表明,高度有序的中孔MSPAN复合材料是用于高级Li-S电池的有希望的阴极活性材料。
更新日期:2017-11-16
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