Morphology and conductivity of in-situ PE0-LiClO_4-TiO_2 composite polymer electrolyte

摘要

PEO-LiClO_4-TiO_2 composite polymer electrolyte films were prepared. TiO_2 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-LiClO_4 polymer electrolyte film. The results show that TiO_2 particles are uniformly dispersed in PEO-LiClO_4-5%TiO_2 composite polymer electrolyte film. The maximal conductivity of 5.5 X 10~(-5) S/cm at 20 ℃ of PEO-LiClO_4-TiO_2 film is obtained at 5% mass fraction of TiO_2.