Preparation and electrochemical properties of gel polymer electrolytes using triethylene glycol diacetate-2-propenoic acid butyl ester copolymer for high energy density lithium-ion batteries

摘要

Gel polymer electrolytes (GPE) composed of triethylene glycol diacetate (TEGDA)-2-propenoic acid butyl ester (BA) copolymer and commercial used liquid organic electrolyte are prepared via in situ polymerization. The ionic conductivity of the as-prepared GPE can reach 5.5 × 10~(-3) S cm~(-1) with 6 wt% monomers and 94 wt% liquid electrolyte at 25 ℃. Additionally, the temperature dependence of the ionic conductivity is consistent with an Arrhenius temperature behavior in a temperature range of 20-90 C. Furthermore, the electrochemical stability window of the GPE is 5 V at 25 ℃. A Li|GPE|(Li[Li_(1/6)Ni_(1/4)Mn_(7/12) ]O_2) cell has been fabricated, which shows good charge-discharge properties and stable cycle performance compared to liquid electrolyte under the same test conditions.