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Enhanced Ionic Conduction Observed for Ordered-Mesoporous Alumina-Ionic Conductor Composites

Published online by Cambridge University Press:  11 February 2011

Hideki Maekawa ,
Ryo Tanaka  and
Tsutomu Yamamura
Hideki Maekawa
Affiliation:
Tohoku Univ, Dept of Metallurgy, Sendai, Japan PRESTO, Japan Science and Technology Corporation, Japan.
Ryo Tanaka
Affiliation:
Tohoku Univ, Dept of Metallurgy, Sendai, Japan
Tsutomu Yamamura
Affiliation:
Tohoku Univ, Dept of Metallurgy, Sendai, Japan
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Abstract

Ordered-mesoporous Al2O3 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 Al2O3 having relatively mono-dispersed particle size was obtained. Composites composed of the synthesized mesoporous Al2O3 and the lithium ion conductor (LiI) was prepared. The dc electrical conductivity of 50LiI ·50(mesoporous Al2O3) was 2.6×10-4 S cm-1 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 Al2O3 composite was examined. A systematic dependence of conductivity upon pore size was observed, in which the conductivity increased with decreasing the pore size.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 756: Symposia EE/FF – Solid-State Ionics – Materials for Fuel Cells and Fuel Processors , 2002 , EE6.18
Copyright
Copyright © Materials Research Society 2003

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References

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