Synthesis, Structural, And Electrochemical Studies Of Nanostructured Niwo4 As Anode For Sodium-Ion And Lithium-Ion Batteries

Abstract

In this work used a chemical precipitation approach to create nanostructured nickel tungstate (NiWO₄), which was then heated to temperatures between 600 and 700 °C. The X-ray diffraction (XRD) investigation indicated that the material calcinated at 700 °C had improved phase purity and crystallinity. The electronic structure and surface chemical states were examined using X-ray photoelectron spectroscopy (XPS). This confirmed that Ni²⁺ and W⁶⁺ were in stable oxidation states and showed that the material was electrochemically ready for charge transfer reactions. Both the lithium-ion and sodium-ion half-cells tested electrochemically performed admirably, exhibiting long-term cycle stability, a favorable rate capability, and a high specific capacity. Thermotreatment improved structural integrity and adjusted surface chemistry for ion intercalation, which led to these enhancements. Results from studies comparing hybrid tungsten oxide systems with rGO-composited NiWO₄ electrodes lend credence to the idea that surface-level alterations play a part in improving performance. According to our results, thermally engineered NiWO₄ has great promise as a bifunctional anode material for future technologies that combine lithium-ion and sodium-ion batteries.