Fabrication of Li-polymer/silica aerogel nanocomposite electrolyte for an all-solid-state lithium battery

Nanocomposite solid-polymer electrolytes were fabricated using polyethylene oxide (PEO), polyvinylidene fluoride (PVDF), LiClO4 and silica aerogel, with the aim of improving lithium ion conductivity and thermal stability. The effects of the PEO:PVDF ratio, polymer:Li-salt ratio, and silica aerogel content on the electrical conductivity of the solid-polymer electrolytes were examined. Highest lithium ion conductivity of 1.70×10−4 S/cm was obtained at 30 °C in the SPE-2 sample with PEO:PVDF=3:1 and polymer:Li-salt=6:1. XRD and FT-IR analysis showed that the observed phenomenon could be explained by the degree of crystallinity of the polymer electrolyte and by the dissociation degree of Li-salt.