Triflate ion association in plasticized polymer electrolytes

被引：39

作者：

Bishop, AG ^{[1
]}

MacFarlane, DR ^{[1
]}

McNaughton, D ^{[1
]}

Forsyth, M ^{[1
]}

机构：

[1] MONASH UNIV,DEPT MAT ENGN,CLAYTON,VIC 3168,AUSTRALIA

来源：

SOLID STATE IONICS | 1996年 / 85卷 / 1-4期

关键词：

FT-IR; polymer electrolytes; ion association; plasticizer; lithium triflate;

D O I：

10.1016/0167-2738(96)00049-5

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：

Ion association in plasticised solid polymer electrolytes (SPEs) has been monitored using FT-IR spectroscopy. The SPEs were prepared from a random co-polymer of ethylene oxide (EO) and propylene oxide (PO) and the salt lithium trifluoromethane sulfonate (lithium triflate, LiTf). Tetraethylene glycol dimethylether (tetraglyme, epsilon similar to 5) and N,N'-dimethyl formamide (DMF, epsilon = 36.7) were chosen as model plasticisers. Decreased ion association resulted from plasticization with DMF, indicating that the addition of a higher dielectric constant solvent increases the fraction of dissociated ions in the SPE. The incorporation of tetraglyme into these SPEs results in increased ion association, despite the similar dielectric constants of the plasticiser and polymer host. The effects of salt concentration (0.05-1.25 mol dm(-3) solvent) upon ion association in SPEs was also investigated. There appears to be a minimum in the number of ''free'' ions at a LiTf concentration of 0.2 mol dm(-3) solvent followed by a maximum at approximately 0.4 mol dm(-3) solvent, consistent with the molar conductivity behaviour previously observed in these electrolytes.

引用

页码：129 / 135

页数：7

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