Mesoporous silica-based lithium single-ion conducting nanoparticles containing weak-binding imide (SO2NSO2CF3-) anions with lithium countercations and co-grafting solvating oligo-poly(ethylene glycol) (CH2CH2O) chains were synthesized via two-step selective functionalization of designated silica precursors into the inner pore wall of mesoporous silica. These nanoparticles are then introduced into poly(ethylene oxide) matrix, allowing us to prepare hybrid inorganic-organic nanocomposite polymer electrolytes. The principal focus of this presentation is on the insight about our understanding of ion and polymer dynamics of the Li single-ion conducting nanocomposite polymer electrolytes. We use various experimental methods (SAXS, FE-SEM, TEM, and BET) to check microstructure, pore size, and surface area of the mesoporous nanoparticles. The ionic conductivity, storage module, lithium transference number of the nanocomposite polymer electrolytes are also investigated using dielectric relaxation spectroscopy, oscillatory shear, DC polarization/AC impedance. Understanding experimental observations in these materials provides useful insights for the design of single-ion conductors for energy applications.

Nanocomposite polymer electrolytes based on poly(ethylene oxide) and Li single-ion conducting mesoporous organosilica nanoparticles

2019 Spring National Meeting

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