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A polypyrrole-supported carbon paper acting as a polysulfide trap for lithium-sulfur batteries

机译：一种含有聚吡咯负载的碳纸，用作锂 - 硫电池的多硫化物疏水阀

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摘要

Lithium-sulfur (Li-S) batteries with high theoretical capacities and low cost are a strong candidate for future energy storage, but their development is hindered by many shortcomings, such as high-rate capacity decay due to the “shuttle effect”. Herein,we increase the capacity retention and cycle life of the Li-S battery through the addition of an interlayer made of polypyrrole (PPy)-treated carbon paper (CP) in a Li-S battery. We first quantitatively investigate the effect of the thickness of the carbon paper and then optimize a novel interlayer prepared by using PPy adhered to the carbon paper. The results show that 300 mCPisthe best choice among the three thicknesses. The CP-300 samples deliver a reversible capacity of 490 mAh g~(-1) after 200 cycles with a 0.5 C rate and show the best rate performance. Because of the porous structure and conductivity of the as-prepared PPy interlayer, the battery incorporating the PPy interlayer exhibits more excellent cycle performance and better rate performance than the CP batteries. Surprisingly, the PPy-coated CP-200 battery displays a reversible capacity of 555 mAh g~(-1) after 200 cycles with a 0.5 C rate. This feasible way to modify a carbon paper interlayer may have promising prospects in the Li-S battery field.
机译：锂 - 硫磺（LI-S）电池具有高理论能力和低成本是未来储能的强大候选者，但它们的发展受到许多缺点的阻碍，例如由于“班车效应”，如高速容量衰变。在此，我们通过在LI-S电池中添加由聚吡咯（PPY） - 治疗碳纸（CP）制成的中间层来增加LI-S电池的容量保持和循环寿命。我们首先定量地研究碳纸厚度的效果，然后优化通过使用粘附到碳纸的PPY制备的新型中间层。结果表明，三个厚度之间的300个McPisthe最佳选择。 CP-300样品在200℃的200个循环后，可逆容量为490 mAh g〜（-1），并显示出最佳速率性能。由于多孔结构和制备的PPY中间层的电导率，包含PPY中间层的电池具有比CP电池更优异的循环性能和更好的速率性能。令人惊讶的是，PPY涂层CP-200电池在200℃速率200周期后显示可逆容量为555mAhg〜（-1）。这种改变碳纸层间的可行方式可能在LI-S电池领域具有很有希望的前景。

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  • 来源
    《RSC Advances》 |2015年第114期|共7页
  • 作者

    Feng Wu; Wenhui Li; Lili Guan;

  • 作者单位

    Beijing Key Laboratory of Environmental Science and Engineering School ofMaterials Science and Engineering Beijing Institute of Technology Beijing 100081 China.;

    Beijing Key Laboratory of Environmental Science and Engineering School ofMaterials Science and Engineering Beijing Institute of Technology Beijing 100081 China.;

    Sinopec Research Institute of Petroleum Processing Beijing 100083 China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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