Effect of the degree of porosity on the performance of poly(vinylidene fluoride-trifluoroethylene)/poly(ethylene oxide) blend membranes for lithium-ion battery separators

Porous polymer membranes based on poly(vinylidene fluoride-trifluoroethylene)/poly(ethylene oxide) copolymers, P(VDF-TrFE)/PEO, are prepared through elimination (from partial to total) of PEO, leading to interconnected micropores in the polymer blends. Electrolyte uptake, thermal and mechanical prop...

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Bibliographic Details
Published in:Solid state ionics 2015-11, Vol.280, p.1-9
Main Authors: Gören, A., Costa, C.M., Tamaño Machiavello, M.N., Cíntora-Juárez, D., Nunes-Pereira, J., Tirado, J.L., Silva, M.M., Gomez Ribelles, J.L., Lanceros-Méndez, S.
Format: Article
Language:English
Subjects:
Battery separator
Ionic conductivity
Lithium-ion batteries
Lithium-ion battery application
Membranes
Oxides
PEO
Polymer blends
Porosity
PVDF-TrFE
Rechargeable batteries
Thermal properties
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Summary:Porous polymer membranes based on poly(vinylidene fluoride-trifluoroethylene)/poly(ethylene oxide) copolymers, P(VDF-TrFE)/PEO, are prepared through elimination (from partial to total) of PEO, leading to interconnected micropores in the polymer blends. Electrolyte uptake, thermal and mechanical properties depend on the amount of PEO present in the polymer blend. Further, the degree of crystallinity of PEO and the elastic modulus (E′) of the polymer blend decrease with increasing PEO removal. Electrical properties of the polymer blend membranes are influenced by the porosity and are dominated by diffusion. The temperature dependence of the ionic conductivity follows the Arrhenius behavior. The ionic conductivity is the highest for the membranes with a volume fraction of pores of 44% (i.e., 90% PEO removal), reaching a value of 0.54mScm−1 at room temperature. Battery performance was determined by assembling Li/C-LiFePO4 swagelok cells. The polymer blends with 90% PEO removal exhibit rate (124mAhg−1 at C/5 and 47mAhg−1 at 2C) and cycling capabilities suitable for lithium ion battery applications. •P(VDF-TrFE)/PEO blends have been developed for battery separator applications.•PEO removal from the membrane increases degree of porosity and electrical properties.•After 90% PEO removal membranes show 44% porosity and a conductivity of 0.54mScm−1.•After 90% PEO removal it is obtained 124mAhg−1 at C/5 and 47mAhg−1 at 2C.•This polymer blends are promising separators for Li-ion battery applications.
ISSN:0167-2738
1872-7689
DOI:10.1016/j.ssi.2015.08.003