Solid polymer electrolyte membrane based on cationic polynorbornenes with pending imidazolium functional groups for all‐solid‐state lithium‐ion batteries

Abstract

Solid polymer electrolytes (SPEs) have received extensive attention in the realm of lithium-ion batteries due to their safety performance, higher specific capacity and structural designability. In recent years, poly ionic liquids (PILs) have been attracting the attention of many researchers because of their high ionic conductivity, wide electrochemical stability window, high thermal stability and less-flammability in comparison with common liquid electrolytes. We selected imidazole cations as functional groups to be attached to the side chain of the polymer to prepare bis-imidazole functionalized benzo-norbornadiene monomer, which copolymerized with epoxy-functionalized norbornene monomer and norbornene (NB) monomer to obtain triblock copolymer. The prepared triblock copolymer was blended with lithium salt (LiTFSI) to obtain a solid polymer electrolyte membrane (SPEM). SPEM achieved an excellent ionic conductivity of 3.1 Â 10 À5 S cm À1 at 30 C, exhibited an electrochemical stability window of up to 4.3 V versus Li/Li + (25 C) and thermal stability up to 275 C under protective (N 2 ) atmosphere. The NCM811/SPEM/Li batteries have exhibited a first discharging capacity of 149.1 mAh g À1 at 0.1 C-rate and the discharge capacity kept 141.6 mAh g À1 at 0.2 C-rate after 50 charge and discharge cycles at 30 C.

High Voltage and Cycling Stable Norbornene-Based Polycarbonate Electrolyte for Lithium Metal Battery

“…Ring-opening metathesis polymerization (ROMP) is a widely applied and powerful method to synthesize diverse polymers with a wide range of properties, functionalities, and architectures under mild conditions from cyclic olefins. , Polymer electrolytes prepared via ROMP have raised much attention in recent years (Table S2). − The majority of research efforts are focused on the synthesis of the molecules and exploration of the fundamental electrochemical properties . However, there are very few investigations into the mechanism of electrochemical applications .…”