Novel polymeric systems for lithium ion batteries gel electrolytes: II. Hybrid cross-linked poly(fluorosilicone-ethyleneoxide) |
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Authors: | GB Appetecchi S Passerini G Caporiccio B Boutevin |
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Affiliation: | a ENEA, Idrocomb C.R. Casaccia, Via Anguillarese 301, 00060 Rome, Italy b Via E. Filiberto 13, 20149 Milano, Italy c Laboratoire de Chimie Macromoléculaire ENSCM, UMR_CNRS 5076, 8 Rue de l’Ecole Normale, F-34296 Montpellier Cedex 5, France |
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Abstract: | Cross-linked, self-supporting, membranes for lithium ion battery gel electrolytes were obtained by cross-linking a mixture of polyfluorosilicone (PFSi) and polysilicone containing ethylene oxide (EO) units P(Si-EO)]. The membranes were also reinforced with nanosized silica. The two polymer precursors were synthesized with functional groups capable to form inter-molecular cross-linking, thus obtaining three-dimensional, polymer matrices. The precursors were dissolved in a common solvent and cross-linked to obtain free-standing PFSi/P(Si-EO):SiO2 composite films. The latter were undergone to swelling processes in (non-aqueous, aprotic, lithium salt containing) electrolytic solutions to obtain gel-type polymer electrolytes. The properties of the swelled PFSi/P(Si-EO):SiO2 samples were evaluated as a function of the electrolytic solutions and the dipping time. The PFSi/P(Si-EO):SiO2 membranes exhibited large swelling properties, high ionic conductivity and good electrochemical stability. |
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Keywords: | Polyfluorosilicone Polysilicone Cross-linked membrane Polymer blend Gel polymer electrolyte |
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