Interfacial Engineering of Fe2VO4 Nanoparticles on MXene Nanosheets for Ultra-Stable and Efficient Sodium Storage

Owing to its high theoretical sodium-storage capacity of approximately 1000 mAh g−1 and cost-efficient characteristics, Fe2VO4 has emerged as a highly attractive anode material for sodium-ion batteries (SIBs). In this work, MXene-incorporated Fe2VO4 composites were successfully synthesized. Comprehensive electrochemical characterization demonstrates that MXene incorporation significantly enhances the electronic conductivity and sodium-ion diffusion kinetics of Fe2VO4, while effectively mitigating volume expansion during cycling. The synthetic substantially improves its cycling stability and rate capability. When the MXene loading ratio is optimized at 5 wt%, the composite exhibits outstanding cyclic durability, with a remarkable reversible specific capacity of 323.3 mAh g−1 maintained after 200 cycles at a current density of 0.1 A g−1. Furthermore, the composite demonstrates outstanding rate performance, with a specific capacity of 164.5 mAh g−1 achieved at a current density of 2 A g−1. The synergistic integration of Fe2VO4 and MXene not only constructs a three-dimensional electrically conductive framework for efficient charge transport but also reinforces strong structural stability against cycling-induced degradation. This work proposes a versatile engineering strategy that can be adapted for other conversion-type electrode materials in the context of advanced energy storage technologies.