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Ionic Conductivity of Polymeric Solid Electrolytes Based on Poly(propylene oxide) or Poly(tetramethylene oxide)

The electrical properties of certain polymeric solid electrolytes were studied. The polymeric solid electrolytes were prepared by dissolving several kinds of salts into the polycation matrix containing poly(propylene oxide) (PPO) or poly(tetramethylene oxide) (PTMO) segment in the main chain. The electrical conductivity at 20°C and the activation energy for conduction ranged from 10−7 to 10−10 S cm−1 and from 8 to 16 kcal mol−1, respectively, being dependent on the salt concentration, the salt species, the PPO segment size and the structure of the polyether segment. The ionic character of the electrical conductivity was demonstrated. Higher conductivity was observed with an increase in the salt concentration, in the PPO segment size and in the sum of the cation and anion radii of the salt in the PPO based polymeric solid electrolytes. The effects of the ion radius on conductivity were divided into two classes with respect to dependence on the salt species. These effects were due to the difference in the dissolving state of the salts in the PPO segment. The conductivity of the PTMO based polymeric solid electrolytes was lower than that of the PPO based polymeric solid electrolytes. The activation energy was mainly influenced by the salt concentration, and little influence of the salt species and the size and structure of the polyether segment was observed.