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Article Dans Une Revue ChemElectroChem Année : 2021

Interplay between Conductivity, Matrix Relaxations and Composition of Ca‐Polyoxyethylene Polymer Electrolytes

Gioele Pagot
Keti Vezzù
Cynthia Susana Martinez-Cisneros
Claire Antonelli
Belen Levenfeld
Alejandro Varez
Jean‐yves Sanchez
Vito Di Noto

Résumé

In this report, the conductivity mechanism of Ca2+-ion in polyoxyethylene (POE) solid polymer electrolytes (SPEs) for calcium secondary batteries is investigated by broadband electrical spectroscopy studies. SPEs are obtained by dissolving into the POE hosting matrix three different calcium salts: CaTf2, Ca(TFSI)2 and CaI2. The investigation of the electric response of the synthetized SPEs reveals the presence in materials of two polarization phenomena and two dielectric relaxation events. It is demonstrated that the nature of the anion (i. e., steric hindrance, charge density and ability to act as coordination ligand) and the density of “dynamic crosslinks” of SPEs is fundamental in the establishment of ion-ion/ion-polymer interactions. The long-range charge migration processes occurring along the two revealed percolation pathways of the electrolytes are generally coupled with the polymer host dynamics and depend on the temperature and the anion nature. This study offers the needed tools for understanding Ca2+ conduction in POE-based electrolytes.

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Chimie
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Dates et versions

hal-04069780 , version 1 (22-10-2023)

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Gioele Pagot, Keti Vezzù, Cynthia Susana Martinez-Cisneros, Claire Antonelli, Belen Levenfeld, et al.. Interplay between Conductivity, Matrix Relaxations and Composition of Ca‐Polyoxyethylene Polymer Electrolytes. ChemElectroChem, 2021, 8 (13), pp.2459-2466. ⟨10.1002/celc.202100475⟩. ⟨hal-04069780⟩
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