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Interplay between Conductivity, Matrix Relaxations and Composition of Ca‐Polyoxyethylene Polymer Electrolytes
Author(s) -
Pagot Gioele,
Vezzù Keti,
MartinezCisneros Cynthia Susana,
Antonelli Claire,
Levenfeld Belen,
Varez Alejandro,
Sanchez JeanYves,
Di Noto Vito
Publication year - 2021
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202100475
Subject(s) - electrolyte , ion , polymer , conductivity , chemical physics , materials science , dielectric , steric effects , ionic conductivity , chemistry , chemical engineering , analytical chemistry (journal) , organic chemistry , composite material , optoelectronics , electrode , engineering
In this report, the conductivity mechanism of Ca 2+ ‐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: CaTf 2 , Ca(TFSI) 2 and CaI 2 . 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 Ca 2+ conduction in POE‐based electrolytes.