Ɛ-Mno2nanoflowersmodified Reduced Graphene Oxide Cathode with Oxygen Vacancy for Advanced Rechargeable Aqueous Zinc-Ion Batteries

Manganese dioxide (MnO2) have risen to prominence as a potential cathode for aqueous zinc-ion batteries (AZIBs), owing to its high theoretical capacity, moderate potential window, low price and abundant reserves. However, the inner poor electrical conductivity and sluggish reaction kinetics of MnO2 can lead to the irreversible phase transition and capacity decay, limiting its further application. Herein, we developed a simple co-precipitation method to construct MnO2 nanoflowers with hexagonal structure modified reduced graphene oxide (MnO2/RGO). Ascribed to the synergetic effects of MnO2 nanoflowers with high theoretical capacity and RGO with high conductivity and stability, the MnO2/RGO composite delivers excellent zinc-ion storage performance with superior cycling stability, fast charge transfer and ion diffusion kinetics. The design scheme in this work is conducive to the industrial production and performance improvement of manganese-based materials into a high-performance cathode of AZIBs.