Polymer grafted on carbon nanotubes as a flexible cathode for aqueous zinc ion batteries

We have developed a free-standing, flexible cathode for an aqueous zinc ion battery by grafting cross-linked polydopamine on carbon nanotubes. The cathode is highly stable, with little capacity degradation for 500 cycles. The flexible cathode is environmentally benign and biocompatible which can enable applications from biomedical devices to grid storage.