Enhancement of ion transport in polymer electrolytes by addition of nanoscale inorganic oxides

The effect of addition of nanoparticle inorganic oxides to poly(ethylene ox ide) (PEO) complexed with LiClO4 on cation transport properties has been ex plored by electrochemical and Li-7 nuclear magnetic resonance (NMR) methods . The presence of the nanoparticles generally increases the ionic conductiv ity and the cation transference number, the effect being greatest for TiO2. The enhancement in cation transference number is directly correlated with increased Li diffusivity measured by NMR. The NMR results also demonstrate that the increased ionic conductivity is not attributable to a correspondin g increase in polymer segmental motion, but more likely a weakening of the polyether-cation association induced by the nanoparticles. (C) 2001 Elsevie r Science B.V. All rights reserved.