Facile synthesis of monoclinic (NH4)2V4O9 nanosheets for zinc-ion batteries

aquest for cathode materials with robust internal structures and efficient ion transport pathways remains critical. In this study, we introduce a simple hydrothermal method to synthesize monoclinic (NH4)2V4O9 nanosheets, serving as a advanced cathode for ZIBs. This material demonstrates outstanding electrochemical properties, with a high specific capacity of 389 mAh g1 at 0.1 A g1, and retains 78.9 % capacity after 3000 cycles at 1 A g1 and 77.3 % after 15,000 cycles at 5 A g1. Additionally, it achieves an energy density of 325 Wh kg1 at 101 W kg1. In-depth electrochemical analysis reveals the structural stability during reversible Zn2+ion intercalation/de- intercalation, underscoring the potential of (NH4)2V4O9 as a high-performance material for ZIBs