Preparation and properties of solid polymer electrolyte membranes based on PEO by electrospinning

Abstract

PEO-based solid polymer electrolytes are considered as a promising solid electrolyte in the field of solid-state lithium batteries.PEO/LiClO4 solid polymer electrolyte(SPE) was prepared through electrostatic spinning technology, in order to meet the demand of industrial production. The effects of spinning voltage, spinning solution concentration and lithium salt content on the morphology and diameter of the fiber were studied.The morphology of SPE fiber was observed by scanning electron microscope and the diameter of SPE fiber was analysed by Image J.Furthermore, the composition, structure and properties of solid polymer electrolyte fiber membranes prepared by electrospinning were studied by DSC, XRD, FTIR-ATR and tensile testing.The results show that the PEO/LiClO4 solid polymer electrolyte membrane prepared by electrostatic spinning method has good fiber morphology, when the spinning voltage is 15 kV, and the concentration of PEO/LiClO4 spinning solution is 6%, and the molar ratio ([EO]: [Li+]) is 10:1.Meanwhile, the average diameter of the fibers is 557 nm, giving relatively uniform distribution.When[EO]: [Li+]=10:1, the melting point of PEO in the SPE fiber membrane is only 53.8℃, with the crystallinity as low as 18.9%. And the ionic conductivity of the prepared SPE exhibits as high as 5.16×10-5 S·cm-1 at 30℃.Moreover, the prepared electrospun SPE has good electrochemical stability and interfacial stability.

Keywords

• solid polymer electrolyte
• polyethylene oxide
• electrospinning
• fiber
• ionic conductivity