Desenvolvimento de um capacitor eletroquimico polimerico

AUTOR(ES)
DATA DE PUBLICAÇÃO

1997

RESUMO

Conducting polymers represent an interesting class of materiaIs for using in electrochemical devices. These materials have important characteristics such as; changing from no conductor electronic state to conductor electronic state by redox process and changing of coloration by the application of an extern potential (electrochromism). The utilization of conducting polymers as an active material on electrodes of electrochemical capacitors is one of the most recent applications. In this work we studied three different solid electrochemical capacitors having polyaniline (Pani) as the active polymer and three types of polymeric solid electrolytes. Using a quartz crystal microbalance, the best condition for polyaniline synthesis were investigated. The influence of the temperature and the method electrochemical synthesis, during the growth and electrochemical characterization of the films, were studied. Solid electrolytes based on poly(epichlorhydrin-co-ethylene oxide), poli(amide 6-b-ethylene oxide) and poly (ethylene oxide)/ poly(epichlorhydrin-co-ethylene oxide) blends were investigated as an ionic conductor. The electrochemical stability window was determined as a function of the salt (LiCIO4) concentration and temperature. The best performance was observed for the sistem Pani// poly (ethylene oxide)/ poly(epichIorhydrin-co-ethylene oxide) blends /LiCIO4//Pani. During 5000 cycles of charge and discharge, it showed a capacitance value of 36 mFcm and a coulombic efficiency of 99%.

ASSUNTO(S)

polimeros condutores eletrolitos

ACESSO AO ARTIGO

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