Electrospun PVDF/PMMA/SiO₂ Membrane Separators for Rechargeable Lithium-Ion Batteries

Abstract:

In this paper composite nanofiber membranes were prepared by electrospinning technology from poly (vinylidene fluoride) (PVDF)-poly (methyl methacrylate) (PMMA)-SiO₂ blend solutions with different PMMA and SiO₂ contents. It was found that the diameter of electrospun nanofibers was greatly increased with the added PMMA content but decreased with the added SiO₂ content, and when both PMMA and SiO₂ were added the diameter of electrospun nanofibers was decreased. With a proper ratio of the PMMA and SiO₂ added, the electrospum nanofiber membrane could have a suitable diameter with high porosity. The XRD results revealed that electrospun nanofiber membranes contained mainly β-phase crystal structure of PVDF, and its crystalline is reduced with the added PMMA and SiO₂ contents due to the inhibited crystallization of the polymer by the inorganic particles and PMMA during the solidification process. These nanofiber membranes exhibited a high electrolyte uptake, around 300%. Moreover, the incorporation of PMMA and SiO₂ into the nanofiber membrane improved the ionic conductivity from 1.7×10⁻³S/cm to 2.0×10⁻³S/cm at room temperature. Compared with commercial film PE, their cell cycle and charge and discharge performance were also greatly improved.

• Periodical: Key Engineering Materials (Volumes 645-646)
• Pages: 1201-1206
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.645-646.1201
• Online since: May 2015
• Authors: Xiao Lin Wu, Jie Lin, Jian Yan Wang, Hang Guo*
• Keywords: Electrospun, PMMA, Polymer Separator, PVDF, SiO₂

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