One-step Preparation of Epoxy Resin-based Ionic Gel Electrolyte for
Solid-state Lithium Metal Batteries
Solid state lithium metal batteries have attracted wide attention in
recent years due to their high energy density, flexibility, and high
safety. In this work, a novel epoxy resin-based ionic gel electrolyte
(IGE) was synthesized via one-step curing polymerization of epoxy
monomer and amine hardener with soft segments in the presence of ionic
liquid electrolytes. The morphology and molecular structure of IGE were
characterized by SEM, AFM and ATR-FTIR. The obtained IGEs showed high
room temperature ionic conductivity from 0.05 mS cm-1 to 1.69 mS cm-1.
In addition, the evolution of solid electrolyte interface (SEI) between
IGE and lithium metal was investigated by electrochemical impedance
spectroscopy, galvanostatic charge-discharge test and X-ray
photoelectron spectroscopy. Finally, The Li/IGE/LiFePO4 cells can
maintain a discharge capacity of 157 mAh g-1 at 0.1 C after 50 cycles at
60℃ and 132 mAh g-1 at 0.2 C after 150 cycles at room temperature.