5 years ago

Solid polymer electrolytes based on phosphorus containing polymers for lithium polymer batteries

Solid polymer electrolytes based on phosphorus containing polymers for lithium polymer batteries
This paper is designated to the development of flame retardant solid polymer electrolytes based on phosphorus containing polymers. The new green technique synthesis, respectively polycondensation under microwave irradiation of hexylphosphonic dichloride (HPD) with 4,4′-(1,3-phenylenediisopropylidene) bisphenol (bisphenol M) was described. 86% yield and 0.95dlg−1 inherent viscosity were obtained. The polyphosphonate was characterized by FT-IR, 1H and 31P NMR spectroscopy, gel permeation chromatography, and thermal analysis. The polymer presents thermal stability, begins to lose weight above 280°C. The influence of the reaction temperature and reaction time on yield and inherent viscosity for MW polycondensation was studied and the results were compared with the results of polycondensation reaction under conventional heating in similar conditions. Best results were obtained under microwave irradiation. Solid polymer electrolytes were obtained from the polyphosphonate complexed with different lithium salts using casting technique and the electrochemical properties were determined. The low activation energy of conduction determined for solid polymer electrolyte membrane with bis(oxalato)borate anions overcomes the activation energy request for relaxation process and this membrane presents the best conductivity. Also, the flammability of polyphosphonate and membranes was investigated by measuring limiting oxygen index values.

Publisher URL: www.sciencedirect.com/science

DOI: S0014305717309382

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