Ionic liquids are used electrochemically, for example, as electrolytes of rechargeable batteries.1) Watanabe and co-workers have developed a novel solid electrolyte in which an ionic liquid is confined in a network polymer called “ion gel”.2) This ion gel is expected to contribute to solidification of various electrochemical systems and safety improvement as it exhibits exceedingly high ion-conductivity compared with conventional solid polymer electrolytes.
Below shows the major ionic liquids. The melting points are shown as the reference value. These are not specification value. The salts that form liquid or solid state at room temperature are given the description “liquid” or "solid".