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首页> 外文期刊>Advanced Functional Materials >Bifunctional Separator with a Light-Weight Carbon-Coating for Dynamically and Statically Stable Lithium-Sulfur Batteries
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Bifunctional Separator with a Light-Weight Carbon-Coating for Dynamically and Statically Stable Lithium-Sulfur Batteries

机译：动态和静态稳定锂硫电池的轻质碳涂层双功能隔板

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摘要

Sulfur is appealing as a high-capacity cathode for rechargeable lithium batteries as it offers a high theoretical capacity of 1672 mA h g~(-1) and is abundant. However, the commercialization of Li-S batteries is hampered by fast capacity fade during both dynamic cell cycling and static cell resting. The poor electrochemical stability is due to polysulfide diffusion, leading to a short cycle life and severe self-discharge. Here, we present the design of a bifunctional separator with a light-weight carbon-coating that integrates the two necessary components already inside the cell: the conductive carbon and the separator. With no extra additives, this bifunctional carbon-coated separator allows the use of pure sulfur cathodes involving no complex composite synthesis process, provides a high initial discharge capacity of 1389 mA h g~(-1) with excellent dynamic stability, and facilitates a high reversible capacity of 828 mA h g~(-1) after 200 cycles. In addition, the static stability is evidenced by low self-discharge and excellent capacity retention after a 3 month rest period.
机译：硫作为可充电锂电池的高容量正极极具吸引力，因为它具有1672 mA h g〜（-1）的高理论容量，并且含量丰富。但是，在动态电池循环和静态电池静止期间，快速容量衰减会阻碍Li-S电池的商业化。不良的电化学稳定性归因于多硫化物的扩散，导致循环寿命短和严重的自放电。在这里，我们介绍一种带有轻质碳涂层的双功能隔板的设计，该涂层将电池内部已经存在的两个必要组件集成在一起：导电碳和隔板。无需额外的添加剂，这种双功能碳涂层隔膜允许使用不涉及复杂复合合成过程的纯硫阴极，提供1389 mA hg〜（-1）的高初始放电容量，具有出色的动态稳定性，并具有高可逆性200个循环后的最大容量为828 mA hg〜（-1）。另外，静态稳定性由低的自放电和在3个月的休息时间后出色的容量保持率证明。

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  • 来源
    《Advanced Functional Materials》 |2014年第33期|5299-5306|共8页
  • 作者

    Sheng-Heng Chung; Arumugam Manthiram;

  • 作者单位

    Electrochemical Energy Laboratory and Materials Science and Engineering Program The University of Texas at Austin Austin, TX 78712, USA;

    Electrochemical Energy Laboratory and Materials Science and Engineering Program The University of Texas at Austin Austin, TX 78712, USA;

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