Enhanced Ionic Conduction Observed for Ordered-Mesoporous Alumina-Ionic Conductor Composites
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<jats:title>ABSTRACT</jats:title><jats:p>Ordered-mesoporous Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> was synthesized by the sol-gel method using neutral surfactants as templates. The pore size can be controlled over the range of 2.8∼12.5 nm by using different surfactant copolymers and by different synthetic conditions. By utilizing cyclohexane as a co-solvent, mesoporous Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> having relatively mono-dispersed particle size was obtained. Composites composed of the synthesized mesoporous Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> and the lithium ion conductor (LiI) was prepared. The dc electrical conductivity of 50LiI ·50(mesoporous Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>) was 2.6×10<jats:sup>-4</jats:sup> S cm<jats:sup>-1</jats:sup> at room temperature, which is more than 100 times higher than that of pure LiI. The pore size dependence of the conductivity of LiI-mesoporous Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> composite was examined. A systematic dependence of conductivity upon pore size was observed, in which the conductivity increased with decreasing the pore size.</jats:p>
収録刊行物
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- MRS Proceedings
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MRS Proceedings 756 2002-01-01
Springer Science and Business Media LLC