Self-assembled layer-by-layer partially reduced graphene oxide–sulfur composites as lithium–sulfur battery cathodes†,RSC Advances

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Self-assembled layer-by-layer partially reduced graphene oxide–sulfur composites as lithium–sulfur battery cathodes†
RSC Advances ( IF 3.9 ) Pub Date : 2018-01-17 00:00:00 , DOI: 10.1039/c7ra12194f
Cen Yao ₁ , Yu Sun ₁ , Kaisen Zhao ₁ , Tong Wu ₁ , Alain Mauger ₂ , Christian M Julien ₂ , Lina Cong ₁ , Jia Liu ₁ , Haiming Xie ₁ , Liqun Sun ₁

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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.

中文翻译：

自组装逐层部分还原氧化石墨烯-硫复合材料作为锂硫电池正极†

构建可靠的导电碳基体对于锂硫电池的含硫正极材料至关重要。通常的解决方案是用硫作为阴极渗透的现成导电基质。在这里，引入了具有有序自组装逐层结构的部分还原的氧化石墨烯-硫复合材料（prGO/S）作为锂硫电池正极。prGO/S复合材料是通过一种简单的一步自组装液体路线合成的。适量的硫在原位通过调节 GO 纳米片的还原程度，沉积在 prGO 纳米片的表面。静电斥力和表面能的综合作用使硫包裹的prGO纳米片自组装形成有序的逐层结构，既保证了硫的均匀分布，又适应了硫物质的体积变化。骑自行车。此外，随着还原时间的增加，prGO/S 复合材料的电导率也会提高。XPS 光谱证实硫仍与 prGO 化学键合。在应用 prGO/S 复合颗粒的 prGO 涂层并作为锂硫电池配置中的中间层后，具有 1275.8 mA hg ^{-1的高初始放电容量}实现了第 100 次循环的放电容量为 1013.8 mA hg ^-1在 0.1C 倍率下。

更新日期：2018-01-17

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