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Carbon onion/sulfur hybrid cathodes via inverse vulcanization for lithium–sulfur batteries†
Sustainable Energy & Fuels ( IF 5.6 ) Pub Date : 2017-10-31 00:00:00 , DOI: 10.1039/c7se00452d
Soumyadip Choudhury 1, 2, 3 , Pattarachai Srimuk 1, 2, 3, 4, 5 , Kumar Raju 6, 7, 8 , Aura Tolosa 1, 2, 3, 4, 5 , Simon Fleischmann 1, 2, 3, 4, 5 , Marco Zeiger 1, 2, 3, 4, 5 , Kenneth I. Ozoemena 8, 9, 10, 11, 12 , Lars Borchardt 3, 13, 14, 15 , Volker Presser 1, 2, 3, 4, 5
Affiliation  

A sulfur–1,3-diisopropenylbenzene copolymer was synthesized by ring-opening radical polymerization and hybridized with carbon onions at different loading levels. The carbon onion mixing was assisted by shear in a two-roll mill to capitalize on the softened state of the copolymer. The sulfur copolymer and the hybrids were thoroughly characterized in structure and chemical composition, and finally tested by electrochemical benchmarking. An enhancement of specific capacity was observed over 140 cycles at higher content of carbon onions in the hybrid electrodes. The copolymer hybrids demonstrate a maximum initial specific capacity of 1150 mA h gsulfur−1 (850 mA h gelectrode−1) and a low decay of capacity to reach 790 mA h gsulfur−1 (585 mA h gelectrode−1) after 140 charge/discharge cycles. All carbon onion/sulfur copolymer hybrid electrodes yielded high chemical stability, stable electrochemical performance superior to conventional melt-infiltrated reference samples having similar sulfur and carbon onion content. The amount of carbon onions embedded in the sulfur copolymer has a strong influence on the specific capacity, as they effectively stabilize the sulfur copolymer and sterically hinder the recombination of sulfur species to the S8 configuration.

中文翻译:

逆硫化 法制备的碳洋葱/硫杂化阴极用于锂-硫电池

通过开环自由基聚合反应合成了硫-1,3-二异丙烯基苯共聚物,并与碳洋葱在不同的负载水平下杂化。在两辊磨机中通过剪切辅助碳洋葱的混合,以利用共聚物的软化状态。对硫共聚物和杂化物进行了结构和化学组成的全面表征,最后通过电化学基准测试进行了测试。在杂化电极中较高含量的碳洋葱下,在140个循环中观察到比容量的增强。共聚物杂化物显示出最大初始比容量为1150 mA hg-1(850 mA hg电极-1),容量衰减低至790 mA hg-1在140个充电/放电循环后(585 mA hg电极-1)。所有碳洋葱/硫磺共聚物混合电极均具有高化学稳定性,稳定的电化学性能,优于具有相似硫和碳洋葱含量的常规熔渗参考样品。嵌入硫磺共聚物中的碳洋葱的数量对比容量有很大的影响,因为它们有效地稳定了硫磺共聚物并在空间上阻碍了硫物种重新结合成S 8构型。
更新日期:2017-10-31
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