Research progress in flexible zinc-air battery cathode based on carbon nanotube materials

As a promising technology for portable electronics, secondary flexible zinc-air batteries have received immense attention in the past decade, particularly for the design and research of the air electrode. Herein, we focused on the most recent developments of the self-supporting air electrode based on carbon nanotube (CNT) materials. We first summarized the synthetic and fabrication methods of CNT and its structure-activity relationship. Section 2 describes the working mechanism and flexible design of the battery. Further, a detailed discussion of the recent advancements in flexible self-supporting air-positive electrodes based on CNTs is provided. As a new development, flexible zinc-air batteries are also discussed separately. Finally, conclusions are presented, followed by a future perspective on fiber-shaped CNT self-supporting air cathode.