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Self-assembled layer-by-layer partially reduced graphene oxide-sulfur composites as lithium-sulfur battery cathodes

机译：作为锂 - 硫电池阴极的自组装层逐层部分地还原的石墨烯氧化物 - 硫复合材料

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摘要

Constructing a reliable conductive carbon matrix is essential for the sulfur-containing cathode materials of lithium-sulfur batteries. A ready-made conductive matrix infiltrated with sulfur as the cathode is the usual solution. Here, a partially reduced graphene oxide-sulfur composite (prGO/S) with an ordered self-assembled layer-by-layer structure is introduced as a Li-S battery cathode. The prGO/S composites are synthesized through a facile one-step self-assembly liquid route. An appropriate amount of sulfur is in situ deposited on the surface of the prGO nanosheets by adjusting the reduction degree of the GO nanosheets. The combined effect of the electrostatic repulsions and surface energy makes the sulfur wrapped prGO nanosheets self-assemble to form an ordered layer-by-layer structure, which not only ensures the uniform distribution of sulfur but also accommodates the volume change of the sulfur species during cycling. Moreover, the conductivity of the prGO/S composites improves when the reduction time increases. XPS spectra confirm that sulfur is still chemically bonded to the prGO. After applying the prGO coating of the prGO/S composite particle and as an interlayer in a lithium-sulfur battery configuration, a high initial discharge capacity of 1275.8 mA h g(-1) is achieved and the discharge capacity of the 100th cycle is 1013.8 mA h g(-1) at 0.1C rate.
机译：构建可靠的导电碳基质对于锂 - 硫电池的含硫阴极材料至关重要。随着阴极渗透的现成导电基质是通常的溶液。这里，将具有有序的自组装层逐层结构的部分还原的石墨烯氧化硫复合材料（PRGO / S）作为Li-S电池阴极引入。 PRGO / S复合材料通过容易的一步自组装液体路线合成。通过调整Go NanosheSs的还原程度，适量的硫在PRGO纳米片的表面上沉积。静电排斥和表面能的综合作用使得硫包装的PRGO纳米蛋白酶自组装形成有序的逐层结构，这不仅可以确保硫的均匀分布，而且还可以适应硫种类的均匀分布骑自行车。此外，当还原时间增加时，PRGO / S复合材料的电导率提高。 XPS光谱确认硫仍然将其化学粘合到PRGO上。在锂 - 硫电池配置中施用PRGO / S复合颗粒的PRGO涂层并作为中间层，实现了1275.8 mA Hg（-1）的高初始放电容量，第100次循环的放电容量为1013.8 mA Hg（-1）0.1c速率。

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  • 来源
    《RSC Advances》 |2018年第7期|共10页
  • 作者

    Yao Cen; Sun Yu; Zhao Kaisen; Wu Tong; Mauger Alain; Julien Christian M.; Cong Lina; Liu Jia; Xie Haiming; Sun Liqun;

  • 作者单位

    Northeast Normal Univ Natl &

    Local United Engn Lab Power Battery Changchun 130024 Jilin Peoples R China;

    Northeast Normal Univ Natl &

    Local United Engn Lab Power Battery Changchun 130024 Jilin Peoples R China;

    Northeast Normal Univ Natl &

    Local United Engn Lab Power Battery Changchun 130024 Jilin Peoples R China;

    Northeast Normal Univ Natl &

    Local United Engn Lab Power Battery Changchun 130024 Jilin Peoples R China;

    Univ Paris 06 Sorbonne Univ CNRS UMR 7590 IMPMC 4 Pl Jussieu F-75005 Paris France;

    Univ Paris 06 Sorbonne Univ CNRS UMR 7590 IMPMC 4 Pl Jussieu F-75005 Paris France;

    Northeast Normal Univ Natl &

    Local United Engn Lab Power Battery Changchun 130024 Jilin Peoples R China;

    Northeast Normal Univ Natl &

    Local United Engn Lab Power Battery Changchun 130024 Jilin Peoples R China;

    Northeast Normal Univ Natl &

    Local United Engn Lab Power Battery Changchun 130024 Jilin Peoples R China;

    Northeast Normal Univ Natl &

    Local United Engn Lab Power Battery Changchun 130024 Jilin Peoples R China;

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