Size dependent ionic conductivity observed for ordered-mesoporous-alumina-ionic conductor composites

被引：1

作者：

Maekawa, H ^{[1
]}

Tanaka, R ^{[1
]}

Shen, HY ^{[1
]}

Fujimaki, Y ^{[1
]}

Yamamura, T ^{[1
]}

Shirata, K ^{[1
]}

Kawai, M ^{[1
]}

机构：

[1] Tohoku Univ, Dept Met, Sendai, Miyagi 9808579, Japan

来源：

SOLID STATE IONICS: THE SCIENCE AND TECHNOLOGY OF IONS IN MOTION | 2004年

关键词：

D O I：

10.1142/9789812702586_0095

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Ordered-mesoporous-Al2O3 was synthesized by sol-gel method using neutral copolymer surfactants as templates. The pore size was controlled over the range of 3 similar to 22 nm by using different surfactant copolymers under different synthetic conditions. By utilizing cyclohexane as a co-solvent, mesoporous-Al2O3 having relatively mono-dispersed particle size was obtained. Composites composed of synthesized mesoporous-Al2O3 and lithium iodide (Lil) was prepared. Dc electrical conductivity of 50Lil(.)50(mesoporous-Al2O3) was 2.6x10(-4) S cm(-1) at room temperature, 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 except for pore size=3 nm. The Li-7 diffusion constant of the composite was investigated by quasi-elastic neutron scattering (QENS) as well as pulsed field gradient nuclear magnetic resonance (PFG-NMR). The dc conductivities showed reasonable agreement with an Einstein equation using measured diffusion constants.

引用

页码：851 / 857

页数：7

共 9 条

[1]

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