Dispositivo de armazenamento de energia utilizando polianilina e eletrolito polimerico

AUTOR(ES)
DATA DE PUBLICAÇÃO

2000

RESUMO

Recently, supercapacitors or electrochemical capacitors have brought renewed interest in the area of energy storage because of possible application in electric vehicles and electronic devices. The developments in this area require energy storage with a high density and short charge discharge times. Conductive polymers have advantages over metal oxides as electrodes for capacitors because they are easy to process and have lower production costs. Results concerning a symmetrical capacitor using chernically synthesized polyaniline (PAni) doped with dodecilbenzene sulfonic acid (DBSA) are reported. We present the performance of two different capacitors using PAni as active material: first, using laminated films, and second, using an elastomeric conductive blend. The polymer electrolyte film used is a 4:1 mixture of poly(ethylene oxide) and poly( epichlorohydrin-co-ethylene oxide) and 15%(w/w) of lithium perchlorate. The ionic conductivity of the polymer electrolyte was characterized and it was ca. 10 Scm (25 °C), e 10 Scm (90 °C). The conductivity of the polymer electrode was characterised in presence of the humidity and solvent .Both may acts as dopant for the PAni film. Results show that a thin laminated film of chemically synthesised PAni presents the best charge storage due to the low diffusion in the films. For the capacitor using a blend as active material, the best result was obtained when the mixture PAni/blend is 1:1. The performance of the devices are reasonable with of short charge/discharge time and high coulombic efficiency. The best capacitor (thickness = 0.33 mm) presents : Ccharge= 130 mFcmg; Power, W = 0,11 mWatts.cm Results show that PAni films and the conductive blend are promising electrode materiais for charge/discharge devices. This work also shows that it is possible to obtain two new types of electrochernical capacitors using chemically synthesised polyaniline.

ASSUNTO(S)

capacitores polieletrolitos polimeros condutores

ACESSO AO ARTIGO

Documentos Relacionados