Near-edge x-ray-absorption fine-structure spectroscopy investigation of poly(ethylene oxide)-KI complexes.

We have measured the near-edge x-ray-absorption fine-structure spectra of the K edge of potassium in the polymer-salt complex poly(ethylene oxide)-KI. Changes are observed as a function of temperature due to modifications of the K-ion coordination. Comparison with model systems suggests that the lower activation energy of this ionic conducting polymer complex at elevated temperature (Tg70 \ifmmode^\circ\else\textdegree\fi{}C) is partially due to reduced oxygen complexation of the K ions.