PAMAM type dendritic electrolytes for lithium ion battery applications

Abstract

Series of boron-complexed ion conducting dendritic electrolytes were prepared and suggested as ‘cobweb’ model. The hydroxyl functionalized Jeffamine® cored polyamidoamine (PAMAM) type dendrimers with various core size and generation were synthesized and their boron-cross linked form was obtained by using BH3–THF complex. During cross linking of the dendrimers, lithium trifluoromethane-sulfonate (CF3SO3Li) salt was added as dopants with different stoichiometric ratios. The structure and interactions of boron-cross linked dendritic electrolytes were investigated by using FT-IR, NMR and Thermograviimetric analysis (TGA). The ionic conductivities of these novel boron-cross linked dendritic electrolytes were studied by dielectric-impedance spectroscopy. Ionic conductivity of the dendritic electrolytes followed Vogel–Tammann–Fulcher (VTF) relationships. The results showed that the highest conductivity of 1.6×10−4S/cm was obtained at 100°C for electrolytes T5000(6-OH)-20.