Ion Transport Mechanisms in Polymer Electrolytes at Normal and High Pressure

摘要: Most polymeric materials are excellent electrical insulators with conductivities as low 10−18 S/cm. Nevertheless, both ion and electron conducting polymers have become very active fields of research. A polymer electrolyte is a material which ionically while the electronic conductivity negligible. There broad current interest in solid electrolytes for such applications batteries, electrochromic devices fuel cells1–2. To obtain an polymer, poly(ethylene oxide), PEO, or poly(propylene PPO, complexed salt, e.g., alkali metal perchlorate triflate. The molecular weight glycols (PEO PPO hydroxyl terminations) often used (PEG PPG). When salt these polymers, cations co-ordinate ether oxygen atoms; lithium may be co-ordinated to approximately four oxygens. But links dynamic equilibrium (breaking reforming) permitting cation move complex response distribution relaxation times segment motion. structural relaxations chains thus coupled motion ions. It also generally contended that, most cases, anion contribute conductivity. is, however, considerable disagreement literature role cations, anions, clusters, solvent separated pairs, contact precipitates, etc., transport, especially related measurement transference, transport diffusion.