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首页> 外文期刊>Journal of materials science >Ketjen Black-titanium dioxide coated glass fiber separator for high performance Li/S cells using bare sulfur cathode
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Ketjen Black-titanium dioxide coated glass fiber separator for high performance Li/S cells using bare sulfur cathode

机译：Ketjen黑色二氧化钛涂层玻璃纤维隔膜，用于使用裸硫阴极的高性能Li / S电池

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摘要

Sulfur is considered as one of the promising cathode candidates for the next generation secondary batteries due to its high theoretical capacity. Several issues, such as the insulation of sulfur and the shuttle effect caused by highly soluble polysulfides, are alleviated by encapsulating sulfur into a conductive framework. However, those methods inevitably sacrifice both the gravimetrically and volumetrically energy density of the fabricated cells. In this context, the issues mentioned above are ameliorated via a commercial Glass Fiber membrane coated with Ketjen Black (KB, commercial EC 600 JD) and titanium dioxide (TiO2) as the separator. Bare sublimed sulfur is employed as the cathode. When being cycled at 0.2C, the Li/S cell, using the membrane coating 20wt% TiO2 and 50wt% KB as separator, presents 1196 and 729mAhg(-1) in the 1st and 200th cycle, respectively. Even being cycled at 2C, the cell still shows 531mAhg(-1) reversible capacity after 100 cycles. Such good performance could be attributed to: (1) the highly conductive KB within the coated layer offers additional electron pathways covering the top surface of the bare sulfur cathode and (2) the coated layer can form chemical binding with lithium polysulfides via TiO2 and physically adsorb the lithium polysulfides through KB, both alleviating the shuttle effect.
机译：由于硫的高理论容量，它被认为是下一代二次电池最有希望的正极材料之一。通过将硫包封在导电骨架中，可以缓解一些问题，例如硫的绝缘和由高可溶性多硫化物引起的穿梭效应。但是，这些方法不可避免地牺牲了所制造电池的重量和体积能量密度。在这种情况下，通过涂覆有科琴黑（KB，商业EC 600 JD）和二氧化钛（TiO 2）作为隔膜的商业玻璃纤维膜可改善上述问题。裸升华硫用作阴极。当在0.2C下循环时，使用20wt％TiO2和50wt％KB膜涂层作为隔膜的Li / S电池在第一个和第200个循环中分别呈现1196和729mAhg（-1）。即使在2C下循环，该电池在100次循环后仍显示531mAhg（-1）可逆容量。这样好的性能可以归因于：（1）涂层内的高导电KB提供了覆盖裸硫阴极顶部表面的附加电子路径，（2）涂层可以通过TiO2与物理上与多硫化锂化学键合通过KB吸附多硫化锂，都减轻了穿梭效应。

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  • 来源
    《Journal of materials science》 |2019年第7期|7054-7064|共11页
  • 作者

    Wan Yonghua; Hong Yilun; Bei Xinwei; Hao Junwei; You Hairui; Niu Congsu; Yang Hui; Liu Xiaomin;

  • 作者单位

    Nanjing Tech Univ, Coll Mat Sci & Engn, Nanjing, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Mat Sci & Engn, Nanjing, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Mat Sci & Engn, Nanjing, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Mat Sci & Engn, Nanjing, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Mat Sci & Engn, Nanjing, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Mat Sci & Engn, Nanjing, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Mat Sci & Engn, Nanjing, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Mat Sci & Engn, Nanjing, Jiangsu, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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