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PEDOT-PSS coated sulfur/carbon composite on porous carbon papers for high sulfur loading lithium-sulfur batteries

机译:用于高硫负载锂硫电池的多孔碳纸上的PEDOT-PSS涂层硫/碳复合材料

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摘要

Increasing the sulfur loading in the cathode of a lithium-sulfur battery is an important way to improve its capacity for practical applications. To achieve this, the present work proposes using PEDOT-PSS to encapsulate sulfur/carbon black (S/BP) by a facile solution mixing method and the formed composite is then coated on a porous carbon paper. It is believed that the formation of a core/shell structure in the PEDOT@S/BP composite can promote the electron transport and effectively impede the diffusion of polysulfides, and the porous carbon paper is able to retain the electrolyte containing the dissolved polysulfides in the cathode and alleviate the adverse effect of sulfur volumetric expansion. Due to such advantages, the proposed cathode, with a high sulfur loading of 3 mg cm(-2), can yield a high reversible capacity of 1041 mA h g(-1) and an excellent cycle stability with a capacity retention of 868 mA h g(-1) after 100 cycles and an average coulombic efficiency of 99.4%.
机译:增加锂-硫电池阴极中的硫负荷是提高其实际应用容量的重要方法。为此,本工作提出使用PEDOT-PSS通过简便的溶液混合方法将硫/炭黑(S / BP)封装起来,然后将形成的复合材料涂覆在多孔碳纸上。据信在PEDOT @ S / BP复合物中形成核/壳结构可以促进电子传输并有效地阻止多硫化物的扩散,并且多孔碳纸能够将包含溶解的多硫化物的电解质保留在聚合物中。阴极并减轻了硫的体积膨胀的不利影响。由于这些优点,建议的阴极具有3 mg cm(-2)的高硫负荷,可产生1041 mA hg(-1)的高可逆容量,并具有868 mA hg的容量保持率,出色的循环稳定性(-1)经过100个循环,平均库仑效率为99.4%。

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