High-performance reversible aqueous zinc-ion battery based on iron-doped alpha-manganese dioxide coated by polypyrrole.

The development of zinc-ion storage cathode materials for aqueous zinc-ion batteries (AZIBs) is a necessary step for the construction of large-scale electrochemical energy conversion and storage devices. Iron-doped alpha-manganese dioxide (α-MnO) nanocomposites were achieved in this study via pre-intercalation of Fe during the formation of α-MnO crystals. A polypyrrole (PPy) granular layer was fabricated on the surface of α-MnO using acid-catalyzed polymerization of pyrroles.