Graphene oxide-supported MnV₂O₆ nanoribbons with enhanced electrochemical performance for sodium-ion batteries

With the increasing importance placed on resources and the environment, lithium-ion batteries have entered a stage of rapid development. However, the current reserves of lithium resources are unable to meet the future demand for large-scale energy storage. Therefore, exploring new energy storage technologies is of utmost urgency. Sodium-ion batteries, not only abundant in reserves and low in cost, but also share similar structural principles and characteristics with lithium-ion batteries, hold the promise of commercialization. The cathode material plays a crucial role in the performance of sodium-ion batteries. Among numerous materials, transition metal vanadates exhibit exceptional theoretical capacity and structural stability. In this study, MnV₂O₆/Graphene Oxide (MVO/GO) nanobelt composites were directly synthesized using a hydrothermal method. The large aspect ratio of the material can shorten the radial transport distance of ions, accelerate ion diffusion, and release stress in the axial direction during cycling. The gaps between nanobelts also facilitate the infiltration of the electrolyte, while the inclusion of graphene oxide provides structural support. The MVO/GO electrode has a high reversible specific capacity (323.8 mAh g⁻¹ after 100 cycles at 100 mA g⁻¹) and excellent long-term cycle performance (900 cycles at 2 A g⁻¹ is 191.2 mAh g⁻¹).