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Construction of core-shell nanofiber membrane with enhanced interface compatibility for lithium-metal battery
Solid State Ionics ( IF 3.2 ) Pub Date : 2020-02-26 , DOI: 10.1016/j.ssi.2020.115266
Xianli Song , Wen Qi , Haitao Zhang , Gongying Wang

Improving interface compatibility is critical to the solid-state lithium metal batteries. Thus, a novel type of core-shell nanocomposite polymer fiber membrane was prepared by a coaxial electrospinning technique. The core-shell nanofiber membranes contains poly (propylene carbonate) (PPC) in the shell, and poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) that containing in-situ generated silica in the core. The structure, topography and compositions of the sample were investigated by scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS). The nanocomposite membranes exhibit three-dimensional framework structure with well-dispersed fibers, and could be transformed readily into gel polymer electrolytes (GPEs) by being soaked in an ionic liquid solution. Our study showed that the core-shell PVDF-HFP-SiO2@PPC polymer electrolyte exhibited a relatively high electrolyte uptake of 460%. The core-shell electrolyte was found to play a significant role in increasing the interface compatibility. The optimized core-shell PVDF-HFP-SiO2@PPC electrolyte exhibited an enhanced ionic conductivity (1.05 mS cm−1) in comparison with the blend PVDF-HFP-SiO2-PPC electrolyte (0.5 mS cm−1) at 25 °C. This study demonstrates that the optimization of composition and microstructure is efficient in the fabrication of high-performance membranes for lithium-metal batteries.



中文翻译:

具有增强的界面相容性的锂金属电池核壳纳米纤维膜的构建

接口兼容性的提高对于固态锂金属电池至关重要。因此,通过同轴电纺丝技术制备了一种新型的核-壳纳米复合聚合物纤维膜。核-壳纳米纤维膜在壳中包含聚碳酸亚丙酯(PPC),在原位包含聚偏氟乙烯-共-六氟丙烯(PVDF-HFP)在芯中生成二氧化硅。通过扫描电子显微镜(SEM)和能量色散X射线光谱(EDS)研究了样品的结构,形貌和组成。纳米复合膜显示出具有良好分散的纤维的三维框架结构,并且可以通过浸泡在离子液体溶液中而容易地转变成凝胶聚合物电解质(GPE)。我们的研究表明,核-壳型PVDF-HFP-SiO 2 @PPC聚合物电解质表现出460%的较高电解质吸收率。发现核-壳电解质在增加界面相容性中起重要作用。优化的核-壳型PVDF-HFP-SiO 2 @PPC电解质表现出增强的离子电导率(1.05 mS cm -1)与25°C下的PVDF-HFP-SiO 2 -PPC混合电解质(0.5 mS cm -1)进行比较。这项研究表明,在制造锂金属电池高性能膜时,成分和微观结构的优化是有效的。

更新日期:2020-02-26
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