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Taming the polysulphide shuttle in Li-S batteries by plasma-induced asymmetric functionalisation of the separator

机译：通过等离子体诱导隔板的不对称官能化来驯服Li-S电池中的多硫化物梭

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摘要

A novel microporous separator for lithium-sulphur batteries, in the form of an asymmetric membrane with cation-exchange functional groups, was synthesised by a one-step plasma-induced graft co-polymerisation. This separator consists of commercial porous polypropylene modified with styrene sulfonate at or near the surface of the material. Both successful grafting and membrane asymmetry were confirmed by attenuated total reflectance Fourier transform infrared spectroscopy. Morphological changes as a function of graft level were analysed using scanning electron microscopy. Additionally, the separators were tested for their ability to inhibit polysulphide diffusion, which showed a strong dependence on the amount of negatively charged -SO3- groups introduced onto the hydrophobic substrate. Cycling tests in model Li-S cells with the modified separators showed improved coulombic efficiency.
机译：通过一步式等离子体诱导的接枝共聚反应合成了一种新型的锂硫电池微孔隔膜，该隔膜为具有阳离子交换官能团的不对称膜。该隔离器由在材料表面或其附近用苯乙烯磺酸盐改性的商用多孔聚丙烯组成。衰减全反射傅里叶变换红外光谱法证实了成功的接枝和膜不对称性。使用扫描电子显微镜分析作为移植物水平的函数的形态变化。另外，测试了隔离物抑制多硫化物扩散的能力，这显示出强烈依赖于引入疏水性底物上的带负电荷的-SO 3-基团的量。使用改进型隔板的Li-S模型电池的循环测试表明库仑效率有所提高。

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