VS₄ anchored on WO₃ achieved superior cathodic performance in rechargeable magnesium battery

Magnesium ions exhibit sluggish diffusion kinetics in Vanadium tetrasulfide hosts at higher magnesiation levels, leading to structural collapse, as this two-dimensional layered structure remains intact due to weak van der Waals forces. A superior magnesium cathode material was specifically designed by anchoring VS₄ onto WO₃ nanoparticles, establishing an interface with an overall percolation network that aims to facilitate Mg²⁺ ion diffusion, thereby achieving higher charge transferability and improved discharge voltage while maintaining the structural integrity of the cathodic material during long cycling. WO₃-backed VS₄ exhibited interfacial stability due to charge re-delocalization at the interface, enhanced charge transferability and conductivity. Hence, enabled higher specific capacity and rate performance. Calculated formation energies justified the stability of this cathodic structure and therefore demonstrated up to 75.97 % diffusion contribution. Bandgap measurements, Density of states analysis and energy band calculations at the interface are reinforcing this claim and clarifying charge transfer phenomenon. Compared with pristine VS₄ at 1.57V, the highest discharge voltage of WO₃-VS₄ appeared at 1.98V and exhibited up to 633.5mAh g⁻¹ capacitance at 100mA g⁻¹ current density because of schematic compatibility, interfacial stability in RMBS. Interfacial compatibility of WO₃-VS₄ displayed extraordinary performances, suggesting a step forward approach for the resolution of a long-standing challenge.