Solvent-Free Composite PEO-Ceramic Fiber/Mat Electrolytes for Lithium Secondary Cells

Solvent-free composite poly(ethylene oxide) (PEO)-ceramic fiber or mat electrolytes with high ionic conductivity and good interfacial stability have been developed using high-ionic-conductivity Lao 55Li0.35Ti03 fibers and mats. The conducting ceramic fibers can penetrate the cross section of the ele...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2005, Vol.152 (1), p.A205-A209
Main Authors: Wang, Chunsheng, Zhang, Xiang-Wu, Appleby, A. John
Format: Article
Language:English
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Summary:Solvent-free composite poly(ethylene oxide) (PEO)-ceramic fiber or mat electrolytes with high ionic conductivity and good interfacial stability have been developed using high-ionic-conductivity Lao 55Li0.35Ti03 fibers and mats. The conducting ceramic fibers can penetrate the cross section of the electrolyte film to provide long-range lithium-ion transfer channels, thus producing composite electrolytes with high conductivity. In this work, a maximum room-temperature conductivity of 5.0 X 10-4 S cm-1 was achieved for 20 wt % La0.55Li0.35TiO3 fiber in a PEO-LiN(SO2CF2CF3)2 mixture containing 12.5 wt % Li+ in PEO. The maximum transference number obtained was 0.7. The ceramic fibers in this composite electrolyte are coated by a very thin PEO layer, which is sufficient to provide good interfacial stability with lithium-ion and lithium-metal anodes.
ISSN:0013-4651
DOI:10.1149/1.1828952