Síntese e Caracterização de Eletrólitos Poliméricos Sólidos à Base de Poliuretano em Dispersão Aquosa para Baterias de Íons de Lítio
DOI:
https://doi.org/10.33414/rtyc.57.49-70.2026Palavras-chave:
baterias de íons de lítio, eletrólitos poliméricos sólidos, poliuretano em dispersão aquosa, condutividade iônicaResumo
O poliuretano em dispersão aquosa (WPU) é uma matriz versátil para o desenvolvimento de eletrólitos poliméricos sólidos (SPEs) para baterias de íons de lítio. Sua arquitetura contém grupos éter na cadeia polimérica, que promovem a coordenação com íons de lítio, aumentando a mobilidade iônica e melhorando a condutividade iônica do material.
Neste trabalho, um WPU foi sintetizado e, posteriormente, SPEs foram preparados pela incorporação de cloreto de lítio (LiCl) em diferentes concentrações na matriz polimérica. Os materiais obtidos foram caracterizados por espectroscopia no infravermelho por transformada de Fourier, difração de raios X, microscopia eletrônica de varredura, análise termogravimétrica, calorimetria diferencial de varredura e espectroscopia de impedância eletroquímica.
A amostra de SPE contendo 10% em massa de LiCl apresentou o melhor desempenho, atingindo uma condutividade iônica de 2.82 × 10⁻⁷ S cm⁻¹ a 25 °C, valor considerado adequado para sistemas SPE baseados em LiCl.
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