Substituição Iônica se sódio por lítio em eletrólitos géis de carboximetilcelulose para dispositivos eletrocrômicos

Abstract

The use of energy-saving devices is becoming increasingly common, as they optimize the use of energy resources and reduce waste. The study presented below aimed to develop polymeric electrolyte gels based on sodium carboxymethyl cellulose (NaCMC), with the addition of Li+ compound salts to enhance ionic conduction, thus demonstrating good electrochemical properties for application in electrochromic or energy-efficient devices. These gels were obtained by dissolving the natural polymer NaCMC in distilled water—two materials considered essential for the production of biodegradable and non-toxic materials. Three components were also added: a plasticizer, a crosslinker, and an ionic salt, which were stirred until a homogeneous polymer gel was formed. The electrolytes were prepared with different concentrations of polymer and Li+ salt. The samples underwent electrochemical analyses (EIS, VC, and VL), XRD and FTIR characterization, and thermal analyses (DSC and TGA). Viscosity, transmittance, and appearance analyses were also performed, with some analyses performed with weekly differentiation. The results demonstrated efficient ion exchange of these gels, with the best having a conductivity of 2.90x10-3 S.cm-1 . They also demonstrated good transparency and homogeneity, compared to other studies, in addition to viscosity values that exhibited a balance between agglutination and ion mobility.