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Poly(vinylidene fluoride)-based, co-polymer separator electrolyte membranes for lithium-ion battery systems

TitlePoly(vinylidene fluoride)-based, co-polymer separator electrolyte membranes for lithium-ion battery systems
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2014
AuthorsCosta, C.M., Ribelles J.L. Gomez, Lanceros-Méndez S., Appetecchi Giovanni Battista, and Scrosati B.
JournalJournal of Power Sources
Volume245
Pagination779-786
ISSN03787753
KeywordsCathodes, Coulombic efficiency, Electrolyte membrane, Electrolytes, Gel polymer electrolytes, Liquids, Lithium batteries, Lithium battery applications, Lithium battery system, Physicochemical property, Poly(vinylidene fluoride), Polymeric blends, Polymers, Separators
Abstract

In the present paper we report and discuss the physicochemical properties of novel electrolyte membranes, based on poly(vinylidenefluoride-co- trifluoroethylene), PVdF-TrFE, and poly(vinylidenefluoride-co- hexafluoropropylene), PVdF-HFP, co-polymer hosts and the PVdF-TrFE/poly(ethylene oxide (PEO) blend as separators for lithium battery systems. The results have shown that the examined separator membranes, particularly those based on the PVdF co-polymers, are able to uptake large liquid amounts leading to high ionic conductivity values. Tests performed on Li/LiFePO4 and Li/Sn-C cells have revealed very good cycling performance even at high current rates and 100% of DOD, approaching the results achieved in liquid electrolytes. A capacity fading lower than 0.002% per cycle was observed. Particularly, the Li/LiFePO4 cathode cells have exhibited excellent rate capability, being still able to deliver at 2C above 89% of the capacity discharged at 0.1C. These results, in conjunction with the about 100% coulombic efficiency, suggest very good electrolyte/electrode compatibility, which results from the high purity and stability of the electrolyte and electrode materials and the cell manufacturing. © 2013 Elsevier B.V. All rights reserved.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84881106151&doi=10.1016%2fj.jpowsour.2013.06.151&partnerID=40&md5=45018a6317cd10d88876bf70c7b625fb
DOI10.1016/j.jpowsour.2013.06.151
Citation KeyCosta2014779