Effect of catalyst on structure of (PEO)₈LiClO₄-SiO₂ composite polymer electrolyte films

Abstract

(PEO)₈LiClO₄-SiO₂ composite polymer electrolytes(CPEs) were prepared by in-situ reaction, in which ethyl-orthosilicate (TEOS) was catalyzed by HCl and NH₃·H₂O, respectively. The ionic conductivity, the contact angle and the morphology of inorganic particles in the CPEs were investigated by AC impedance spectra, contact angle method and TEM. The conductivities of acid-catalyzed CPE and alkali-catalyzed CPE are 2.2×10⁻⁵ and 1.1×10⁻⁵ S/cm respectively at 30 °C. The results imply that the catalyst plays an important role in the structure of in-situ preparation of SiO₂, and influences the surface energy and conductivity of CPE films directly. Meanwhile, the ionic conductivity is related to the surface energy.

Keywords

PEO(polyethylene oxide) / SiO₂ / composite polymer electrolyte / conductivity / catalytic reaction

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