Applications of Ionic Liquid-Based Electrolytes in Batteries

Ionic liquids (ILs) are molten salts that are composed of ions having a melting point below 100°C and possess numerous physiochemical characteristics. They found potential applications in many areas, including chemical, biological, and interdisciplinary areas of science and technology, which have attracted many researchers worldwide for various purposes. Ionic liquids broadcast many unique physiochemical properties like high ionic conductivity and thermal stability, low volatility and vapor pressure, etc. Therefore, they are considered as “green solvents.” More importantly, their physiochemical properties can be modified for specific purposes by simply adjusting the cation and/or anion structures of the ILs. One of the important qualities associated with ILs is that they can be used as both solvents and electrolytes, depending on the requirement. In addition to this, because of their distinctive physicochemical qualities, ILs are widely used in a variety of energy applications, particularly for green and sustainable energy storage and conversion materials and systems. Suitable ILs are nowadays designed to be utilized as electrolytes in batteries. This book chapter highlights the utilization of ionic liquid-based electrolytes in different types of batteries.