Analysis of diffusion in a solid polymer electrolyte in the context of a phase-separated system -: art. no. 042803

被引:26
作者
Edman, L [1 ]
Ferry, A
Orädd, G
机构
[1] Umea Univ, Dept Phys, SE-90187 Umea, Sweden
[2] Umea Univ, Dept Chem, SE-90187 Umea, Sweden
来源
PHYSICAL REVIEW E | 2002年 / 65卷 / 04期
关键词
D O I
10.1103/PhysRevE.65.042803
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
The salt and ionic diffusion coefficients of the salt LiN(CF3SO2)(2) (LiTFSI) dissolved in high-molecular-weight poly(ethylene oxide) [PEO] have been measured over a broad concentration range, and the interrelationship of the measured values is demonstrated to be in good agreement with basic electrochemical theory. In the light of recently published structural findings, we propose a biphasic model for the conducting amorphous state, consisting of a stoichiometric P(EO)(6)LiTFSI phase dispersed into a salt-containing disordered phase, and analyze the ionic diffusion data within the framework of the Bruggeman-Landauer theory. The agreement between experimental and fitted data is shown to be excellent. We conclude by pointing out and discussing potential weaknesses of our analysis.
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页数:4
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