The influence of interface polarization on the determination of lithium transference numbers of salt in polyethylene oxide electrolytes

被引：87

作者：

Hiller, M. M. ^{[1
]}

Joost, M. ^{[3
]}

Gores, H. J. ^{[2
]}

Passerini, S. ^{[2
]}

Wiemhoefer, H. -D. ^{[1
]}

机构：

[1] Univ Munster, Inst Inorgan & Analyt Chem, D-48149 Munster, Germany

[2] Univ Munster, Dept Phys Chem, D-48149 Munster, Germany

[3] Univ Munster, Battery Res Lab MEET, D-48149 Munster, Germany

来源：

ELECTROCHIMICA ACTA | 2013年 / 114卷

关键词：

Lithium transference numbers; PEO; Effective lithium conductivity; Diffusion coefficient; Poly(ethylene oxide); STATE CURRENT FLOW; POLYMER ELECTROLYTES; TRANSPORT-PROPERTIES; ION; CONDUCTIVITY; CELLS;

D O I：

10.1016/j.electacta.2013.09.138

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Lithium transference numbers, salt diffusion coefficients and effective lithium conductivities are investigated with the steady state polarization method for poly(ethylene oxide) (PEO) based polymer electrolytes containing lithium bis(oxalato)borate (LiBOB) or lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). We compare the commonly used evaluation technique with our approach. Here, the focus is laid on the potential relaxation of the polarized sample which delivers information about the salt diffusion and the potential distribution in symmetric Li/electrolyte/Li cell. The new approach circumvents the well-known initial current issue and thus increases the reliability of the experiment. The temperature dependence of the lithium transference numbers and the importance of data acquisition time are also discussed. The highest lithium transference numbers are 0.19 for P(EO)(60)center dot LiTFSI at 90 degrees C. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：21 / 29

页数：9

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