Abstract
A hyperbranched poly[bis(hexaethylene glycol)benzoate] with terminal acetyl groups was prepared, and ionic conductivity, thermal property, and electrochemical stability of the polymer electrolyte with LiN(CF 3SO 2) 2 were investigated. Ionic conductivity of the polymer electrolyte exhibited a maximum value of 9×10 −5 S/cm at a [LiN(CF 3SO 2) 2]/[repeat unit] ratio of 0.6 (corresponding to a Li/O ratio of 0.04) and 80°C. The effect of a hyperbranched polymer, a poly[bis(triethylene glycol)benzoate] with terminal acetyl groups (poly-Ac1b), as an additive on ionic conductivity of a linear poly(ethylene oxide) (PEO)/LiN(CF 3SO 2) 2 electrolyte was also investigated. Addition of 10 wt.% poly-Ac1b improved ionic conductivity and also ion transference number in the polymer electrolyte.
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