Synthesis and properties of all solid polymer electrolytes based on poly(vinyl acetate-co-acetyl ethylene oxide acrylate)

Poly(acetyl ethylene oxide acrylate-co-vinyl acetate) (P(AEOA-VAc)) was synthesized and used as a host for lithium perchlorate to prepare an all solid polymer electrolyte. Introduction of carbonyl groups into the copolymer increased ionic conductivity. All solid polymer electrolytes based on P(AEOA-VAc) at 14.3 wt% VAc with 12wt% LiClO₄ showed conductivity as high as 1.2×10^-4Scm^-1 at room temperature. The temperature dependence of the ionic conductivity followed the VTF behavior, indicating that the ion transport was related to segmental movement of the polymer. FTIR was used to investigate the effect of the carbonyl group on ionic conductivity. The interaction between the lithium salt and carbonyl groups accelerated the dissociation of the lithium salt and thus resulted in a maximum ionic conductivity at a salt concentration higher than pure PAEO-salts system.