Journal
SOLID STATE IONICS
Volume 159, Issue 1-2, Pages 89-95Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0167-2738(02)00917-7
Keywords
polyethylene oxide; SnO2 nanoparticle; hybrid polymer electrolyte; Lewis acid-base interaction; oxygen vacancy
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Uniform SnO2 narroparticles were synthesized hydrothermally and calcined at elevated temperatures to obtain samples of different sizes, shapes and surface states. XPS and near-IR spectroscopy data prove that there exist a large amount of oxygen vacancies or interstitial Sn atoms on the SnO2 nanoparticle surface. The incorporation of these SnO2 particles into polyethylene oxide (PEO)-LiClO4 composite through sonicating dispersion and annealing in vacuum renders the latter amorphous and more conductive. The calcined SnO2 samples, which have higher oxygen vacancy concentrations, exhibit stronger conductivity enhancement effect in the hybrid polymer electrolyte (HPE). Therefore, the oxygen vacancies on Sno(2) surface were regarded as the active Lewis acidic sites that interact with both PEO segments and ClO4- ions leading to conductivity improvement. (C) 2002 Elsevier Science B.V All rights reserved.
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