Novel poly(vinylidene fluoride-trifluoroethylene)/poly(ethylene oxide) blends for battery separators in lithium-ion applications

Polymer blends based on poly(vinylidene fluoride-trifluoroethylene)/poly(ethylene oxide), P(VDF-TrFE)/PEO for Li-ion battery separator applications have been prepared through solvent casting technique. The microstructure, hydrophilicity and electrolyte uptake strongly depend on PEO content within the blend. The best value of ionic conductivity at room temperature was 0.25 mS cm−1 for the 60/40 membrane. The membranes are electrochemically stable.

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► New P(VDF-TrFE)/PEO polymer blends were prepared for battery separator.
► The porosity and hydrophilicity degree are tailored within this blend.
► Ionic conductivity depends on PEO presence and is stable with temperature.
► High ionic conductivity of 0.25 mS cm−1 for the 60/40 blend.