Elaboration et étude des propriétés physico-chimique d’un polymère électrolyte.

Abstract

The objective of this work is the development of a polymer gel electrolyte and its physico-chemical characterization. A study of the influence of the concentration in salt of lithium (LiClO4), of the temperature as well as the viscosity on the electrical liquid electrolyte conductivity containing N,N Formamides dimethyl of tetrahydrofurane and their mixtures, with the LiClO4 salt showed a better conductivity for mixtures in solvents (DMF/THF) oscillating between 50% and 60% in THF. The preparation of the polymer gel electrolyte [A% (50% DMF/50% THF /1M LiClO4]+ B% PMMA has been achieved. The polymer gel electrolyte [95% (50% DMF / 50% THF + 1M LiClO4 + 5% PMMA] gave the best electrical conductivity determined by the spectroscopy of impedance wich equals to 1,4964.10-3.Scm-1. The analysis IR spectroscopic showed the presence of interactions between the salt (LiClO4) and the polymer. The cyclic voltampérometry of polymer gel electrolyte containing 5% of PMMA permitted to note an electro-chemical stability of 4V/acier, it has been chosen then like polymer gel electrolyte for lithium polymer secondary battery.