Polymeric ionic liquids(PILs) are polymers that have repeating unit bearing an electrolyte group of cation or anion. These polymers combine the advantages of ionic liquids and polymers
and have attracted broad attention in the field of polymer chemistry and materials science in recent years. In this review
PILs are classified as polycation-type ILs
polyanion-type ILs
poly(zwitterions)-type ILs and copolymer-type ILs
and the properties and synthesis method of each type of PILs are introduced. Moreover