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Ionic conductivity in crystalline polymer electrolytes

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Z Gadjourova, Yuri Georgievich Andreev, David Prestwich Tunstall, Peter George Bruce

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Polymer electrolytes are the subject of intensive study, in part because of their potential use as the electrolyte in all-solid-state rechargeable lithium batteries(1). These materials are formed by dissolving a salt (for example LiI) in a solid host polymer such as poly(ethylene oxide) (refs 2-6), and may be prepared as both crystalline and amorphous phases. Conductivity in polymer electrolytes has long been viewed as confined to the amorphous phase above the glass transition temperature, T-g, where polymer chain motion creates a dynamic, disordered environment that plays a critical role in facilitating ion transport(2,3,7-9). Here we show that, in contrast to this prevailing view, ionic conductivity in the static, ordered environment of the crystalline phase can be greater than that in the equivalent amorphous material above T-g. Moreover, we demonstrate that ion transport in crystalline polymer electrolytes can be dominated by the cations, whereas both ions are generally mobile in the amorphous phase(10). Restriction of mobility to the lithium cation is advantageous for battery applications. The realization that order can promote ion transport in polymers is interesting in the context of electronically conducting polymers, where crystallinity favours electron transport(11,12).



Original languageEnglish
Pages (from-to)520-523
Number of pages4
Issue number6846
Publication statusPublished - 2 Aug 2001

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ID: 187624