Poly(vinylidene-co-hexafluoropropylene) membrane modified with glass fibers and polyvinyl pyrrolidone: Mechanical and electrochemical properties

摘要

The polymer electrolytes based on poly(vinylidene-co-hexafluoropropylene) (PVDF-co-HFP) have been widely studied and applied in devices for its excellent electrochemical and mechanical properties. Here, porous PVDF-co-HFP membrane modified with glass fibers (GFs) and polyvinyl pyrrolidone (PVP) were fabricated by phase-transfer method. When the dosage of GFs exceeded 1 wt%, the composite membranes exhibited 6.11 MPa tensile strength. When the dosage of GFs and PVP reached 1% (PVP(1)GF(1)), respectively, the composite membranes in porous network structure possessed the highest electrolyte uptake of 251.02%, the thermal stability of 343 degrees C and the ionic conductivity of 3.05 x 10(-3) S cm(-1). Electrochromic device (ECD) was assembled with PVP(1)GF(1) electrolyte, showing quick responses between the bleached and the color states within 3 s. The PVDF-co-HFP composite electrolyte was expected to be effective substitutes for liquid electrolytes used in ECDs.