Ionically Conductive Thin Polymer Film Prepared by Plasma Polymerization: I . Hybrid Film of Plasma Polymer Formed from Octamethylcyclotetrasiloxane, Poly(propylene oxide), and Lithium Perchlorate

Abstract

Ultrathin polymer membranes are prepared by polymerizing octamethylcyclotetrasiloxane in glow discharge. Membranes formed by glow discharge (plasma) polymerization are uniform and pinhole‐free. Polymeric solid electrolyte membranes are prepared by hybridization of plasma polymer formed from octamethylcyclotetrasiloxane, poly(propylene oxide), and lithium perchlorate. The films are about 1 μm thick and show high ionic conductivity of the order of 10⁻⁶S · cm⁻¹ (10 Ω cm² resistance per unit area of solid polymer electrolyte) at 60°C. The conductivity depends on the content of lithium perchlorate, and its temperature dependence fits with the WLF‐type equation rather than the Arrhenius equation.