Colloidal dispersion of Nb2O5/reduced graphene oxide nanocomposites as functional coating layer for polysulfide shuttle suppression and lithium anode protection of Li-S battery.,Journal of Colloid and Interface Science

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Colloidal dispersion of Nb2O5/reduced graphene oxide nanocomposites as functional coating layer for polysulfide shuttle suppression and lithium anode protection of Li-S battery.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-01-20 , DOI: 10.1016/j.jcis.2020.01.066
Qingyan Ma ₁ , Mengfei Hu ₁ , Yuan Yuan ₁ , Yankai Pan ₁ , Mingqi Chen ₁ , Yayun Zhang ₁ , Donghui Long ₂

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Functional separator, which bridges anode, electrolyte and cathode together, has the potential to offer a good solution for efficient polysulfide diffusion inhibition and anode protection of Li-S battery. Herein, a novel ultra-thin multifunctional separator is prepared by a facile coating of colloidal dispersion of Nb2O5/reduced graphene oxide nanocomposites (rGO) onto porous polypropylene (PP) matrix. Benefiting from the physical blocking effect of rGO layer and chemisorption of Nb2O5, the shuttle of polysulfides has been greatly suppressed. Meanwhile, the rGO layer functioning as a conductive upper current collector can improve the sulfur utilization, while the Nb2O5 with high activity promotes the transformation of sulfur-containing species. With the assistant of Nb2O5-rGO function layer, the sulfur cathode shows significantly improved electrochemical performance with a high specific capacity of 1328 mAh g-1 at 0.2C and 754 mAh g-1 retained after 200 cycles. The sulfur cathode also exhibits excellent rate capability and stable Coulombic efficiency of 91% without the addition of LiNO3 in the electrolyte. Moreover, the presence of thin Nb2O5-rGO layer also prevents the lithium surface corrosion and the dendrite growth in the lithium anode.

中文翻译：

Nb2O5 /还原氧化石墨烯纳米复合材料的胶态分散体作为功能涂层，用于抑制Li-S电池的多硫化物穿梭和锂阳极保护。

可以将阳极，电解质和阴极桥接在一起的功能性隔板，有可能为有效抑制Li-S电池的多硫化物扩散和阳极保护提供良好的解决方案。本文中，通过将Nb2O5 /还原的氧化石墨烯纳米复合材料（rGO）的胶态分散体轻松涂覆到多孔聚丙烯（PP）基质上，制备了一种新型的超薄多功能隔板。得益于rGO层的物理阻断作用和Nb2O5的化学吸附作用，多硫化物的穿梭受到了极大的抑制。同时，rGO层用作导电的上部集电器可以提高硫的利用率，而具有高活性的Nb2O5则促进了含硫物质的转化。借助Nb2O5-rGO功能层的帮助，硫阴极显示出显着改善的电化学性能，在0.2C下具有1328 mAh g-1的高比容量，在200次循环后保留了754 mAh g-1的比容量。在电解质中不添加LiNO3的情况下，硫阴极还具有出色的速率能力和91％的稳定库仑效率。此外，Nb2O5-rGO薄层的存在还可以防止锂表面腐蚀和锂阳极中枝晶的生长。

更新日期：2020-01-21

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