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Influence of the porosity degree of poly(vinylidene fluoride-co- hexafluoropropylene) separators in the performance of Li-ion batteries

TitoloInfluence of the porosity degree of poly(vinylidene fluoride-co- hexafluoropropylene) separators in the performance of Li-ion batteries
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2014
AutoriSousa, R.E., Nunes-Pereira J., Costa C.M., Silva M.M., Lanceros-Méndez S., Hassoun J., Scrosati B., and Appetecchi Giovanni Battista
RivistaJournal of Power Sources
Volume263
Paginazione29-36
ISSN03787753
Parole chiaveDiffusion phenomena, Good capacity retentions, Hexafluoropropylene, Lithium batteries, Lithium compounds, N, N-Dimethylformamide, Nominal capacities, Organic solvents, Polyelectrolytes, Polymer electrolyte, Polymers, Polyvinylidenedifluoride-hexafluoropropylene, Porosity, Porous membranes, Scanning electron microscopy, Separators
Abstract

Polyvinylidenedifluoride-hexafluoropropylene, (P(VdF-HFP))-based polymer electrolytes, as separators for lithium batteries, were prepared through different polymer/solvent (N,N-dimethylformamide, DMF) ratios and physicochemically investigated. Scanning electron microscopy measurements have shown a homogeneously distributed porosity within the membranes, with moderately tortuous pathways, resulting in a liquid uptake up to 77 wt.% with respect to the overall weight and conduction values above 10-3 S cm-1 at room temperature. Prolonged cycling tests, performed on Li/Sn-C and Li/LiFePO4 half-cells based on P(VdF-HFP) polymer electrolyte separator membranes, have evidenced nominal capacities ranging from 70% to 90% of the theoretical value with very good capacity retention and charge/discharge efficiency close at 100% even at high current rates. A capacity decay is observed at high current regime, associated to the diffusion phenomena occurring within the electrode and the polymer electrolyte separator membrane. © 2014 Elsevier B.V. All rights reserved.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84899537468&doi=10.1016%2fj.jpowsour.2014.04.014&partnerID=40&md5=1b885c9740f6c8453dbf0a60d4d09cbe
DOI10.1016/j.jpowsour.2014.04.014
Citation KeySousa201429