Nitrile-Functionalized Poly(allyl glycidyl ether) based Solid Polymer Electrolyte for Lithium Battery

Abstract

Poly (allyl glycidyl ether) based solid polymer electrolytes were synthesized for lithium battery. Polymer backbone were synthesized by ring-opening anionic polymerization of allyl glycidyl ether. This polymer had controlled molecular weight and narrow dispersity. And the synthesized side chain by Michael reaction which has high dielectric constant group was introduced to polymer backbone by thiol-ene click reaction. The modified polymer was solidified by crosslinking via Diels-alder reaction with four different percentages of crosslinking. The rapid decrease of ionic conductivity at room temperature, which is the limit of PEO based electrolytes, was not occurred in all synthesized polymer electrolytes. And the modified polymer electrolyte had much higher ion conductivity than unmodified one. Particularly, in solid state polymer electrolytes, the polymer electrolyte which was crosslinked by 3% had maximum ionic conductivity of 1.1 x 10-4 S/cm at room temperature. These ionic conductivity results are correlated to the prevention of crystallization and the improved ability of lithium salt dissociation due to side chain introduction.