Electrical properties of PEO–LiCF₃SO₃–SiO₂nanocomposite polymer electrolytes

Nanoparticle oxide fillers such as SiO2 have been previously shown to affect the properties of polymer electrolytes, especially those based on polyether–lithium salt systems. In this work nanocomposite solid polymer electrolyte films composed of polyethyleneoxide (PEO), lithium triflate (LiCF3SO3) and SiO2 nanofiller (15 nm in size) have been prepared by using solution cast method. At room temperature, the sample 80PEO–20LiCF3SO3 (wt-%) was found to have the highest conductivity of about 2·04 × 10–7 S cm–1. The 88PEO–LiCF3SO3–12SiO2 (wt-%) has high ionic conductivity of about 1·28 × 10–3 S cm–1 at room temperature. The effects of concentration of filler on the dielectric properties of the electrolytes were also studied. Temperature effects on the dielectric properties revealed that the electrolytes to be of the non-Debye type.