Commercial liquid electrolytes used in lithium secondary batteries possess high ionic conductivity but suffer from limited electrochemical and chemical stability. Consequently, polymer electrolytes (PEs) are being actively researched for next-generation batteries due to their enhanced stability. However, conventional PEs face a trade-off limitation between ionic conductivity and mechanical strength.
To overcome this, we synthesized a novel monomer incorporating a urethane structure for mechanical strength and a fluorosulfonyl group to facilitate lithium ion dissociation. In the fabrication process, the synthesized monomer was first mixed with LiFSI to induce salt dissociation, and then blended with 1,4-butanediol diglycidyl ether (BDE), which imparts flexibility, at various ratios to fabricate PEs.
The structures were characterized using NMR and FT-IR. Thermal and electrochemical properties were analyzed via TGA, DSC, EIS, and LSV.