Characterization and Properties of P(VdF-HFP)-Based Fibrous Polymer Electrolyte Membrane Prepared by Electrospinning

Abstract

Microporous fibrous membranes were prepared from poly(vinylidenefluoride-co-hexafluoropropylene) P(VdF-HFP) solutions in an acetone/N,N-dimethylacetamide mixture using the electrospinning method. Varying the P(VdF-HFP) polymer concentration in electrospinning can easily control the pore size and the porosity of the electrospun fibrous membranes (ES-FMs). The usefulness of the ES-FMs as a matrix of polymer electrolyte for a lithium-ion polymer battery with high performance was evaluated. Electrospun fibrous polymer electrolyte membranes (ES-FPEMs) showed excellent electrochemical properties of ionic conductivity, higher than 1×10−3 S/cm at room temperature, and the electrochemical stability window, up to 4.5 V vs. Li+/normalLi. At a C/2 rate, the prototype cell using the ES-FPEM showed a good charge/discharge property, with little capacity fade under constant current and constant voltage conditions at 20 and 60°C. © 2004 The Electrochemical Society. All rights reserved.

Applications of electrospun nanofibers

“…It was also found that the formation of interconnected web structure via heat treatment improved both the mechanical properties and dimensional stability of nanofiber membranes [259,260] . Similar results were also obtained using poly(vinylidene fluoride-co-hexafluoropropylene) P(VdF-co-HFP) nanofiber membrane as separator [261][262][263] .…”

Ionic conductivity and electrochemical properties of nanocomposite polymer electrolytes based on electrospun poly(vinylidene fluoride-co-hexafluoropropylene) with nano-sized ceramic fillers

“…The narrow range of porosity of these membranes is the result of the electrospinning parameters that lead to close similarities in the membrane morphologies and interlaying of the fibers. The values of porosities are higher than those reported in some earlier works [25,30]. Fig.…”

“…where M m is the mass of the dry membrane, M BuOH is the mass of n-butanol absorbed, BuOH and P are the densities of n-butanol and polymer, respectively [25].…”

Electrospun Nanofibers for Sandwiched Polyimide/Poly (vinylidene fluoride)/Polyimide Separators with the Thermal Shutdown Function

“…The porosity (P) is an important parameter for separators as it influences the electrolyte uptake and ionic conductivity [21,22]. The quantitative analysis is conducted here by using the n-butanol uptake method and calculated as [23]:…”