The mechanical and electrochemical properties of gel electrolytes, formed by immobilizing ethylene carbonate (EC) – propylene carbonate (PC)/lithium perchlorate (LiClO4) 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 jC 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/LiClO4 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.
Some Physicochemical Properties of PAN-based Electrolytes: Solution and Gel Microstructures
NICOTERA, ISABELLA
;COPPOLA, Luigi;OLIVIERO ROSSI, Cesare;RANIERI, Giuseppe Antonio
2004-01-01
Abstract
The mechanical and electrochemical properties of gel electrolytes, formed by immobilizing ethylene carbonate (EC) – propylene carbonate (PC)/lithium perchlorate (LiClO4) 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 jC 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/LiClO4 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
