As an alternative to PEO based solid polymer electrolytes, we have synthesized via physical route solid polymer electrolyte films, formed by blends of PEO and PPO, as a way to improve lithium transport and the mechanical properties of the films. In this way different binary blends of the polymers mentioned above were prepared, studying their crystalline and amorphous structure by means of differential scanning calorimetry, optical microscopy and FTIR and X-ray spectrometry. In addition, ionic conductivity of the samples was measured as a function of temperature.
