Composite polymer electrolytes with improved lithium metal electrode interfacial properties: I. Electrochemical properties of dry PEO-LiX systems

TitleComposite polymer electrolytes with improved lithium metal electrode interfacial properties: I. Electrochemical properties of dry PEO-LiX systems
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication1998
AuthorsAppetecchi, Giovanni Battista, Croce F., Dautzenberg G., Mastragostino M., Ronci F., Scrosati B., Soavi F., Zanelli A., Alessandrini F., and Prosini P.P.
JournalJournal of the Electrochemical Society
Volume145
Pagination4126-4132
ISSN00134651
KeywordsCeramic materials, Composite materials, Conductive plastics, Electric breakdown, Electrochemical electrodes, Electrochemistry, Ionic conduction, Lithium aluminate, Lithium batteries, Lithium compounds, lithium tetrafluoroborate, Lithium trifluoromethane sulfonate, Plastics fillers, Polyelectrolytes, Polyethylene oxides, Secondary batteries
Abstract

Several types of lithium ion conducting polymer electrolytes have been synthesized by hot-pressing homogeneous mixtures of the components, namely, poly(ethylene oxide) (PEO) as the polymer matrix, lithium trifluoromethane sulfonate (LiCF3SO3), and lithium tetrafluoborate (LiBF4), respectively, as the lithium salt, and lithium gamma-aluminate γ-LiAlO2, as a ceramic filler. This preparation procedure avoids any step including liquids so that plasticizer-free, composite polymer electrolytes can be obtained. These electrolyte have enhanced electrochemical properties, such as an ionic conductivity of the order of 10-4 S cm-1 at 80-90°C and an anodic breakdown voltage higher than 4 V vs. Li. In addition, and most importantly, the combination of the dry feature of the synthesis procedure with the dispersion of the ceramic powder, concurs to provide these composite electrolytes with an exceptionally high stability with the lithium metal electrode. In fact, this electrode cycles in these dry polymer electrolytes with a very high efficiency, i.e., approaching 99%. This in turn suggests the suitability of the electrolytes for the fabrication of improved rechargeable lithium polymer batteries.

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