Lithium to oxygen ratio and the effect on conductivity in a non-volatile linear polyethylenimine-based polymer electrolyte

摘要

Linear polyethyleniniine-N-propyl sulfonate (PEISultone) was synthesized in order to explore the effects of a high molecular weight (7.2 kDa), fixed counteranion for lithium ion conduction in a non-volatile polymer electrolyte system. Using 1.5kDa polyethylene glycol (PEG) as the electrolyte solvent, blended films of PEG and PEISultone in varying ratios were analyzed by impedance spectroscopy in order to find the optimal Li:O ratio for lithium ion conduction in this system and other comparable systems. Results from this test system indicate that conductivity peaks at ratios near 1:17, with a decreasing conductivity trend as ratios become either larger than 1:17 or smaller than 1:17. The results of this study will be used a guideline for the design of new random and diblock copolymers with a PEG and N-propyl sulfonate functionalized PEI backbone.