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Abstract
The mechanical and electrochemical properties of gel electrolytes, formed by immobilizing ethylene carbonate (EC)–propylene carbonate (PC)/lithium perchlorate (LiClO 4) solutions in a polyacrylonitrile (PAN) matrix, were investigated by oscillating rheological experiments, conductivity measurements and 1H-NMR spectroscopy. The gel's rheological behaviour showed two thermoreversible structural transitions in the temperature range 25–120 °C independent from the salt content in the membranes but can be attributed to the only polymeric matrix. In this paper, we also report a study of the EC–PC/LiClO 4 solutions in a wide concentration range performed by pulsed gradient spin–echo NMR (PGSE–NMR) technique. The solvent self-diffusion coefficient measurements have allowed elaborating a model to describe the solvation mechanism of the lithium ions in these solutions.
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