Spectroscopic studies on waterborne polyurethane-polysiloxane solid polymer electrolytes

A series of novel polymer/salt complexes, based on the blends of waterborne polyurethane (WPU) and polysiloxane (PDMS) as polymer matrix and lithium pechlorate (LiClO₄) as doped salt, were prepared successfully. The ac impedance results show the sample with LiClO₄ 15% possesses the highest ionic conductivity and the relationship between the ionic conductivity and temperature could be probably described by the Arrhenius equation. FT-IR spectra was used to analyze the interaction of Li⁺ cation with carbonyl and ether groups. When the salt concentration reached 15%, the coordination of Li⁺ cation with carbonyl and ether groups gets to the maximum. The Raman spectra results show that the polymer host had a good solvation ability for LiClO₄. The effective ionic species increased with increasing salt concentration and it was benefit for ion conduction.