Graphdiyne Oxide‐Based High‐Performance Rechargeable Aqueous Zn–MnO₂ Battery

Abstract

Abstract Designing materials and architectures for improving the performance of rechargeable aqueous Zn–MnO 2 battery has gained extensive interest. The main challenge is to retain high capacity, superior rate performance capability, and long‐term stability capacity. This paper describes how a graphdiyne oxide (GDYO) membrane can endow Zn–MnO 2 batteries with high capacity, high rate capability, and long‐term stability. The specific capacity of the modified battery reaches as high as 300 mA h g −1 at a current density of 308 mA g −1 over 50 cycles. Even at a high current density of 3080 mA g −1 , this Zn–MnO 2 battery exhibits a capacity of 100 mA h g −1 over 2000 cycles. Moreover, the effect of the GDYO membrane and the reaction mechanism is elucidated. The GDYO membrane allows the reversible stripping/plating of zinc ions to maintain a Coulombic efficiency of ≈100% for 800 h. Therefore, it is believed that the GDYO membrane ensures well‐aligned ion transport and, thus, stabilizes the electrodes. This feasible approach toward Zn–MnO 2 batteries will open up alternative pathways for fabricating other high‐performance Zn‐ion batteries.