A Review on Multifaceted Role of Ionic Liquids in Modern Energy Storage Systems: From Electrochemical Performance to Environmental Sustainability

Ionic liquids (ILs) have attracted considerable attention in energy storage due to their unique properties, including a wide electrochemical stability window that facilitates their use in high-voltage systems, enhancing the battery energy density. For instance, the electrolyte consisting of polyethylene glycol diacrylate (PEGDA), LiBF4 salt, 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF4) ionic liquid, and SiO2 nanoparticles exhibited the total conductivity with significant values, reaching approximately 10–4 S cm–1 at −40 °C, 10–3 S cm–1 at 25 °C, and 10–2 S cm–1 at 100 °C for battery. Taking this into consideration, this Review highlights recent advancements in the development and utilization of ionic…