Size-dependent ionic conductivity observed for ordered mesoporous alumina-LiI composite

被引：72

作者：

Maekawa, H

Tanaka, R

Sato, T

Fujimaki, Y

Yamamura, T

机构：

[1] Tohoku Univ, Grad Sch Sci, Dept Met, Aoba Ku, Sendai, Miyagi 9808579, Japan

[2] Japan Sci & Technol Corp, PRESTO, Kawaguchi 3320012, Japan

[3] Tohoku Univ, Interdisciplinary Res Ctr, Sendai, Miyagi 9808578, Japan

来源：

SOLID STATE IONICS | 2004年 / 175卷 / 1-4期

关键词：

lithium ion conductor; mesoporous alumina; nano size effect; interfacial effect;

D O I：

10.1016/j.ssi.2003.12.032

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Ordered mesoporous Al2O3 was synthesized by a solution sol-gel method using neutral copolymer surfactants as templates. The pore size was controlled over the range of 2.8-12.5 nm by using different surfactant copolymers under different synthetic conditions. By utilizing cyclohexane as a cosolvent, mesoporous Al2O3 having relatively monodispersed particle size was obtained. Composites composed of the synthesized mesoporous Al2O3 and the lithium ion conductor (LiI) was prepared by heating the composite in a sealed Pyrex tube at 773 K. Composition dependence of the dc conductivity was determined from a single are in the observed impedance spectra. The maximum dc electrical conductivity, 2.6 x 10(-4) S cm(-1) at 298 K, was observed for 50 LiI . 50 Al2O3 composite with 4.2 nm averaged mesoporosity, which was considerably higher than the previously reported LiI-alumina composites. A systematic dependence of conductivity upon pore size was observed, in which the conductivity increased with decreasing the pore size. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：281 / 285

页数：5