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Improvement on electrochemical performance by electrodeposition of polyaniline nanowires at the top end of sulfur electrode

机译：通过在硫电极顶端电沉积聚苯胺纳米线改善电化学性能

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摘要

Herein, we introduce a modification of the sulfur electrode by electrodepositing a covering layer of polyaniline nanowires at the top end for Li-S batteries. The as-fabricated electrodes are evaluated via SEM, FTIR, EDAX, EIS, CV and charge-discharge tests. The SEM images combined with FTIR spectra show that the surface of the electrode is covered by the PANI nanowires. The charge-discharge tests of PANI-5 display the best cyclic performance, delivering the initial discharge capacity of 1304mAh g~(-1), and 725 mAh g~(-1) after 100 cycles at the current density of 320 mAg~(-1). The CV results of the PANI-5 present an overlapping of cathodic/anodic peaks, indicating that the suitable mass of PANI coating can increase the reversibility of the electrode. SEM combined with EDAX tests of the electrodes after cycles show that the sulfur species are trapped by the PANI nanowires. These results demonstrate that the PANI covering layer plays a barrier to restrain the dissolution of the polysulfides, and provide spaces as well as conductive media for sulfur species.
机译：在这里，我们通过在Li-S电池的顶端电沉积聚苯胺纳米线的覆盖层来介绍硫电极的一种改进。通过SEM，FTIR，EDAX，EIS，CV和充放电测试对制成的电极进行评估。 SEM图像结合FTIR光谱显示，电极表面被PANI纳米线覆盖。 PANI-5的充放电测试显示出最佳的循环性能，在320 mAg〜（ -1）。 PANI-5的CV结果显示出阴极/阳极峰的重叠，表明合适的PANI涂层质量可以提高电极的可逆性。循环后的SEM结合EDAX测试电极显示，硫物质被PANI纳米线捕获。这些结果表明，PANI覆盖层起到了限制多硫化物溶解的屏障的作用，并为硫物质提供了空间以及导电介质。

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  • 来源
    《Applied Surface Science》 |2013年第ptab期|900-906|共7页
  • 作者

    Kai Zhang; Jie Li; Qiang Li; Jing Fang; Zhian Zhang; Yanqing Lai; Yujie Tian;

  • 作者单位

    School of Metallurgy and Environment, Central South University, Changsha 410083, PR China;

    School of Metallurgy and Environment, Central South University, Changsha 410083, PR China;

    School of Metallurgy and Environment, Central South University, Changsha 410083, PR China;

    School of Metallurgy and Environment, Central South University, Changsha 410083, PR China;

    School of Metallurgy and Environment, Central South University, Changsha 410083, PR China;

    School of Metallurgy and Environment, Central South University, Changsha 410083, PR China;

    School of Metallurgy and Environment, Central South University, Changsha 410083, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Li-S battery; Cathode design; Surface modification; Polyaniline;

    机译：锂电池阴极设计;表面改性;聚苯胺;

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