Hierarchical Structured SrV2O6/2D-V2CTX MXene Nanohybrid Material for Robust and High-Capacity Aqueous Zn-Ion Batteries

High capacity, good cyclic stability, and high energy density cathode materials for aqueous Zn-ion batteries are an ongoing challenge for researchers. Here, we prepared SrV2O6 nanoparticles by a simple hydrothermal method to use as the cathode material for Zn-ion batteries, which has a moderate specific capacity and cyclic stability. To further increase its electrode performance, SrV2O6 nanoparticle-anchored 2D-V2CTx MXene is successfully fabricated, which has a significant improvement in specific capacity and structural stability than the SrV2O6-based electrode. The prepared electrode material displays an initial high specific capacity of 348 mA h g(-1) at 0.1 C rate because of the large specific surface area and high electrical conductivity. It exhibits cyclic stability of more than 1000 cycles with 79% of capacity retention. The material shows a better performance with a high energy density of 330 Wh kg(-1) at a power density of 245 Wg(-1). This work will expand the available options to develop metal-vanadium-oxide-based electrode materials for energy storage devices.