Morphology and conductivity of in-situ PEO-LiClO₄-TiO₂ composite polymer electrolyte

Abstract

PEO-LiClO₄-TiO₂ composite polymer electrolyte films were prepared. TiO₂ was formed directly in matrix by hydrolysis and condensation reaction of tetrabutyl titanate. The crystallinity, morphology and ionic conductivity of composite polymer electrolyte films were examined by differential scanning calorimetry, scanning electron microscopy, atom force microscopy and alternating current impedance spectroscopy, respectively. The glass transition temperature and the crystallinity of composite polymer electrolytes are decreased compared with those of PEO-LiClO₄ polymer electrolyte film. The results show that TiO₂ particles are uniformly dispersed in PEO-LiClO₄-5%TiO₂ composite polymer electrolyte film. The maximal conductivity of 5.5×10⁻⁵ S/cm at 20 °C of PEO-LiClO₄-TiO₂ film is obtained at 5% mass fraction of TiO₂.

Keywords

polyethylene oxide (PEO) / TiO₂ / composite polymer electrolyte / in-situ composite / conductivity