This research focuses on testing the performance of sodium-ion batteries using variations in NaNO₃ electrolyte concentrations (1M and 4M) and solvent types (H₂O and DMSO), with the aim of determining the most effective combination. The objective of this study is to analyze the electrochemical characterization of TiO₂/NaNiPO₄ electrodes and to assess the influence of solvent and electrol…