Abstract:Novel polymer electrolytes were prepared by highly mixing poly(lithium acrylate)(PPALi) with eutectic lithium salts of lithium acetate and lithium nitrate. Poly(lithium acrylate) was preparaed by inverse emulsion polymerization from crylic acid and LiOH. Phase transition temperatures were measured for all the eutectic lithium of binary system samples as a function of the concentration of Li(CH₃COO),  and the mixtures exhibit the lowest phase transition temperatures of (448±2)K at about 50% (mass fraction) Li(CH₃COO). Thermogravimetry (TG) and X-ray diffraction (XRD) analysis indicate the formation of a novel polymer-salt complex. The highest conductivity (approximately 4.97×10-5S•cm^-1) is found at room temperature with the electrolyte composition of eutectic mixture of about 80% (mass fraction), poly(lithium acrylate)20% under quickly cooling condition, which is 150% higher than that under natural cooling condition.

Key words: polymer electrolyte; thermal stability; ionic conductivity