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Membranes 2015, 5(4), 752-771; doi:10.3390/membranes5040752

Influence of the Ionic Liquid Type on the Gel Polymer Electrolytes Properties

Grupo de Materiales Avanzados para la Producción y Almacenamiento de Energía (MAPA), Campus de Alfonso XIII, Universidad Politécnica de Cartagena, Cartagena 30203, Murcia, Spain
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Academic Editor: Bruno Scrosati
Received: 30 September 2015 / Accepted: 17 November 2015 / Published: 19 November 2015
(This article belongs to the Special Issue Membranes for Electrochemical Energy Applications 2015)
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Abstract

Gel Polymer Electrolytes (GPEs) composed by ZnTf2 salt, poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP), and different ionic liquids are synthesized using n-methyl-2-pyrrolidone (NMP) as solvent. Three different imidazolium-based ionic liquids containing diverse cations and anions have been explored. Structural and electrical properties of the GPEs varying the ZnTf2 concentration are analyzed by ATR-FTIR, DSC, TG, and cyclic voltammetry. Free salt IL-GPEs present distinct behavior because they are influenced by the different IL cations and anions composition. However, inclusion of ZnTf2 salt inside the polymers provide GPEs with very similar characteristics, pointing out that ionic transport properties are principally caused by Zn2+ and triflate movement. Whatever the IL used, the presence of NMP solvent inside the polymer’s matrix turns out to be a key factor for improving the Zn2+ transport inside the GPE due to the interaction between Zn2+ cations and carbonyl groups of the NMP. High values of ionic conductivity, low activation energy values, and good voltammetric reversibility obtained regardless of the ionic liquid used enable these GPEs to be applied in Zn batteries. Capacities of 110–120 mAh·g−1 have been obtained for Zn/IL-GPE/MnO2 batteries discharged at −1 mA·cm−2. View Full-Text
Keywords: ionic liquid-based Gel Polymer Electrolytes; ionic conductivity; cation transport number; zinc batteries ionic liquid-based Gel Polymer Electrolytes; ionic conductivity; cation transport number; zinc batteries
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Tafur, J.P.; Santos, F.; Romero, A.J.F. Influence of the Ionic Liquid Type on the Gel Polymer Electrolytes Properties. Membranes 2015, 5, 752-771.

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