Comparison of Solvent-Cast and Hot-Pressed P(EO)[sub 20]LiN(SO[sub 2]CF[sub 2]CF[sub 3])[sub 2] Polymer Electrolytes Containing Nanosized SiO[sub 2]

Solvent-cast and hot-pressed P ( EO ) 20 LiN ( SO 2 CF 2 CF 3 ) 2 (LiBETI) polymer electrolytes containing ceramic fillers such as 7 nm SiO 2 and 2-4 μm γ ­ LiAlO 2 were prepared. The ionic conductivity and interfacial stability of these poly(ethylene oxide) electrolytes were investigated. The addition of ceramic fillers to solvent-cast and hot-pressed P ( EO ) 20 LiBETI polymer electrolytes did not result in any substantial improvement of ionic conductivity. However, solvent-cast SiO 2 -containing P ( EO ) 20 LiBETI polymer electrolytes showed a much higher interfacial resistance and Li stripping overvoltage than hot-pressed and filler-free solvent-cast electrolytes.