“…So far a broad library of PILs with tunable architectures and properties has been developed through combinations of ammonium, pyridinium, imidazolium, 1,2,3‐triazolium or phosphonium cations with anions such as halides (e.g., Br − , I − ), inorganic fluorides (e.g., PF 6 − , BF 4 − ), or perfluorinated sulfonimides [e.g., (CF 3 SO 2 ) 2 N − , (CF 3 CF 2 SO 2 ) 2 N − ] . PILs have shown promising performances in applications including dye‐sensitized solar cells, fuel cells, light‐emitting electrochemical cells, batteries, sensors, actuators, field‐effect transistors, electrochromic devices, switchable surfaces, permselective membranes, (nano)composites, and catalysis . Most synthetic approaches toward development of PILs involve the direct polymerization of IL monomers or the post‐polymerization chemical modification of neutral polymers into charged ones.…”