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Flexible and Hierarchically Structured Sulfur Composite Cathode Based on the Carbonized Textile for High-Performance Li–S Batteries
ACS Applied Materials & Interfaces ( IF 9.5 ) Pub Date : 2018-01-16 00:00:00 , DOI: 10.1021/acsami.7b16174
Peibo Gao 1 , Shixing Xu 1 , Zhangwei Chen 2 , Xi Huang 1 , Zhihao Bao 1 , Changshi Lao 2 , Guangming Wu 1 , Yongfeng Mei 3
Affiliation  

Carbon hosts have been utilized to obtain composite cathodes with high sulfur loadings for Li–S batteries. However, the complicated synthesis process may hinder their practical applications. Their mechanical and electrochemical properties shall be further improved. Herein, a facile scalable dip-coating process is developed to synthesize a flexible composite cathode with a high sulfur loading. Via the process, a hybrid composed of carbon nanotubes, carbon black, sulfur, and titania nanoparticles is successfully conformally coated on the carbonized textile (c-textile). The formed flexible [email protected]/TiO2 cathodes with sulfur loadings of 1.5 and 3.0 mg cm–2 can deliver reversible discharge capacities of 860 and 659 mA h g–1 at 2 C, respectively. For the latter one, it can retain 94% of the initial capacity after 400 cycles with a high Coulombic efficiency (∼96%). When its sulfur loading is further increased to 7.0 mg cm–2, its areal capacity reaches 5.2 mA h cm–2. Such excellent performance is ascribed to the synergy effect of the three-dimension conductive hierarchical pore structure and TiO2 additive. They can physically and chemically entrap the soluble polysulfides in the composite cathode. The as-synthesized free-standing composite electrode is of low cost and a high areal capacity, making it suitable for flexible energy storage applications based on Li–S batteries.

中文翻译:

基于碳化锂纤维的高性能多层锂柔性柔性复合阴极

碳基质已被用于获得Li-S电池具有高硫负载的复合阴极。但是,复杂的合成过程可能会阻碍其实际应用。它们的机械和电化学性能应进一步提高。本文中,开发了一种容易的可缩放浸涂工艺以合成具有高硫负载量的柔性复合阴极。通过该过程,将由碳纳米管,炭黑,硫和二氧化钛纳米颗粒组成的杂物成功地共形涂覆在碳化纺织品(C纺织物)上。硫含量分别为1.5和3.0 mg cm –2的柔性[受电子邮件保护] / TiO 2柔性阴极可提供860和659 mA hg –1的可逆放电容量。分别在2C。对于后者,它可以在400个循环后以高库仑效率(〜96%)保留94%的初始容量。当其硫负荷进一步增加到7.0 mg cm -2时,其面积容量达到5.2 mA h cm -2。这种优异的性能归因于三维导电分层孔结构和TiO 2添加剂的协同作用。它们可以物理和化学方式将可溶性多硫化物截留在复合阴极中。合成后的独立式复合电极价格低廉,面容量高,使其适合基于Li-S电池的灵活储能应用。
更新日期:2018-01-16
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