Graphdiyne-Modified Polyimide Separator: A Polysulfide-Immobilizing Net Hinders the Shuttling of Polysulfides in Lithium–Sulfur Battery,ACS Applied Materials & Interfaces

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Graphdiyne-Modified Polyimide Separator: A Polysulfide-Immobilizing Net Hinders the Shuttling of Polysulfides in Lithium–Sulfur Battery
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-09-18 , DOI: 10.1021/acsami.9b11989
Yanqing Wang _{1,

2} , Jianjiang He ₁ , Zengqi Zhang ₁ , Zhihong Liu ₃ , Changshui Huang ₁ , Yongcheng Jin ₁

Affiliation

Graphdiyne (GDY), a new type of carbon material with an electron-rich conjugated structure, has been investigated as a separator coating layer to enhance the electrochemical performance of lithium–sulfur (Li–S) battery. Acetylenic bond (−C≡C–C≡C−) and benzene ring in the GDY coating layer are experimentally verified to reversibly attract the soluble lithium polysulfides by chemical adsorption during cycling. Meanwhile, the shuttle effect of soluble polysulfides is further physically restricted by the GDY coating layer due to the evenly distributed pores (5.42 Å) and a consistent interlayer spacing (3.65 Å) of GDY. Moreover, GDY is a conducting carbon skeleton with high Li⁺ mobility that can improve the rate performance. Hence, Li–S battery with an as-prepared GDY coating layer shows excellent electrochemical performances including superior specific capacity, excellent rate performance, and low capacity attenuation rate. The high initial discharge capacity of 1648.5 mA h g^–1 at 0.1C and 819.5 mA h g^–1 even at a high rate of 2C is achieved by this novel separator. The initial capacity of 1112.9 mA h g^–1 at 0.5C is retained to 816.7 mA h g^–1 after 200 cycles with a low attenuation rate of 0.13% per cycle. Compared with other coated separators, these results show that the GDY coating layer endows the separator with superior electrochemical performances for Li–S battery.

中文翻译：

石墨二炔改性的聚酰亚胺分离器：固定化聚硫的网阻碍了锂硫电池中聚硫化物的穿梭

Graphdiyne（GDY）是一种具有富电子共轭结构的新型碳材料，已被研究用作隔板涂层以增强锂硫（Li-S）电池的电化学性能。实验证明，GDY涂层中的乙炔键（-C≡C-C≡C-）和苯环可通过循环过程中的化学吸附可逆地吸引可溶性多硫化锂。同时，由于GDY涂层的孔隙均匀分布（5.42Å）和GDY的层间间距一致（3.65Å），可溶性多硫化物的穿梭效应在物理上进一步受到GDY涂层的限制。此外，GDY是具有高Li ⁺的导电碳骨架可以改善费率性能的移动性。因此，具有制备好的GDY涂层的Li–S电池具有出色的电化学性能，包括出色的比容量，出色的倍率性能和低容量衰减率。1648.5毫安汞的高的初始放电容量^-1在0.1C和819.5毫安汞柱^-1即使在2C的高速率通过这种新颖的分离器来实现。200个循环后，在0.5C时的初始容量1112.9 mA hg ^–1保持为816.7 mA hg ^–1，每个循环的衰减率低至0.13％。与其他涂层隔膜相比，这些结果表明，GDY涂层赋予隔膜以Li–S电池优异的电化学性能。

更新日期：2019-09-18

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