Effects of inhomogeneity on ionic conductivity and relaxations in PEO and PEO-salt complexes

被引：72

作者：

Dygas, JR

Misztal-Faraj, B

Floljanczyk, Z

Krok, F

Marzantowicz, M

Zygadlo-Monikowska, E

机构：

[1] Warsaw Univ Technol, Fac Phys, PL-00662 Warsaw, Poland

[2] Warsaw Univ Technol, Fac Chem, PL-00664 Warsaw, Poland

来源：

SOLID STATE IONICS | 2003年 / 157卷 / 1-4期

关键词：

polymer electrolyte; poly(ethylene oxide); two-phase structure; impedance spectroscopy; dielectric relaxation;

D O I：

10.1016/S0167-2738(02)00217-5

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：

Electrical properties of purified poly(ethylene oxide)-PEO and PEO with dissolved lithium salts, PEO10:LiCF3SO3 and PEC10:LiN(CF3SO2)(2), were investigated by impedance spectroscopy. Changes of the impedance spectra during crystallization and melting were recorded. Semicrystalline polymer films exhibited frequency dependence of conductivity with two limiting values of conductivity at low and at high frequency. It was concomitant with dispersion of the electric permittivity exhibiting the low-frequency values of the order of 200. In the case of PEO with dissolved salt, when the film was quasi-amorphous, the electric permittivity also exhibited pronounced dispersion, which was probably due to the presence of crystalline PEO-salt complexes. The dielectric relaxation caused by rearrangement of dipoles in PEO chain was observed at low temperatures and high frequencies. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：249 / 256

页数：8

共 31 条

[1] ION CONDUCTIVITY, ELECTRICAL RELAXATION AND ION ASSOCIATION IN POLY(PROPYLENE GLYCOL) COMPLEXED WITH AMMONIUM TRIFLATE [J].