Cation and anion co-doped N/Mn-NiCo2O4 nanosheets as a high-performance electrode for aqueous zinc ion batteries

Abstract

Introducing elemental doping and utilizing defect engineering techniques can significantly enhance the electrochemical performance of electrode materials employed in aqueous zinc-ion batteries. In this study, a high-performance cation and anion co-doped N/Mn-NiCo2O4 nanosheet electrode material was synthesized for aqueous zinc ion batteries. The abundant oxygen vacancies, which are generated through the co-doping process, along with the vertically aligned nanosheets, offer a substantial number of redox-active sites for electrochemical reactions, consequently enhancing the electrochemical performance of the N/Mn-NiCo2O4 electrode. The N/Mn-NiCo2O4 electrode exhibits an impressive specific capacity of 382 mA·h g−1 when evaluated at a current density of 4 A·g−1. Furthermore, the N/Mn-NiCo2O4//Zn battery configuration demonstrates a specific capacity of 352.2 mA·h g−1 at a current density of 2 A·g−1, achieving an energy density of 606 Wh·kg−1 and a power density of 6.893 kW·kg−1.