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首页> 美国卫生研究院文献>Nanomaterials >Polyimide-Coated Glass Microfiber as Polysulfide Perm-Selective Separator for High-Performance Lithium-Sulphur Batteries
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Polyimide-Coated Glass Microfiber as Polysulfide Perm-Selective Separator for High-Performance Lithium-Sulphur Batteries

机译：聚酰亚胺涂层玻璃微纤维作为高性能锂硫电池的聚硫烫发选择隔板

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Although numerous research efforts have been made for the last two decades, the chronic problems of lithium-sulphur batteries (LSBs), i.e., polysulfide shuttling of active sulphur material and surface passivation of the lithium metal anode, still impede their practical application. In order to mitigate these issues, we utilized polyimide functionalized glass microfibers (PI-GF) as a functional separator. The water-soluble precursor enabled the formation of a homogenous thin coating on the surface of the glass microfiber (GF) membrane with the potential to scale and fine-tune: the PI-GF was prepared by simple dipping of commercial GF into an aqueous solution of poly(amic acid), (PAA), followed by thermal imidization. We found that a tiny amount of polyimide (PI) of 0.5 wt.% is more than enough to endow the GF separator with useful capabilities, both retarding polysulfide migration. Combined with a free-standing microporous carbon cloth-sulphur composite cathode, the PI-GF-based LSB cell exhibits a stable cycling over 120 cycles at a current density of 1 mA/cm and an areal sulphur loading of 2 mgS/cm with only a marginal capacity loss of 0.099%/cycle. This corresponds to an improvement in cycle stability by 200%, specific capacity by 16.4%, and capacity loss per cycle by 45% as compared to those of the cell without PI coating. Our study revealed that a simple but synergistic combination of porous carbon supporting material and functional separator enabled us to achieve high-performance LSBs, but could also pave the way for the development of practical LSBs using the commercially viable method without using complicated synthesis or harmful and expensive chemicals.
机译：尽管在过去的二十年中已经进行了许多研究工作，但是锂硫电池（LSB）的长期问题，即活性硫材料的多硫化物穿梭和锂金属阳极的表面钝化，仍然阻碍了它们的实际应用。为了减轻这些问题，我们利用聚酰亚胺功能化玻璃微纤维（PI-GF）作为功能性分隔物。水溶性前体能够在玻璃微纤维（GF）膜的表面上形成均匀的薄涂层，并具有缩放和微调的潜力：PI-GF的制备方法是将商业GF浸入水溶液中制备聚酰胺酸（PAA），然后进行热酰亚胺化。我们发现，少量的0.5 wt。％的聚酰亚胺（PI）足以使GF分离器具有有用的功能，而这两者都阻碍了聚硫化物的迁移。基于PI-GF的LSB电池与独立的微孔碳布-硫复合阴极组合，在120 mA循环中显示出稳定的循环，电流密度为1 mA / cm，表面硫负荷为2 mgS / cm每周期0.099％的边际容量损失。与没有PI涂层的电池相比，这相当于将循环稳定性提高了200％，比容量提高了16.4％，每个循环的容量损失提高了45％。我们的研究表明，多孔碳载体材料和功能性分隔物的简单但协同的结合使我们能够获得高性能的LSB，但也可以为使用商业上可行的方法开发实用LSB铺平道路，而无需使用复杂的合成方法或有害且有害的物质。昂贵的化学品。

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