文摘
Na3V2O2(PO4)2F (I4/mmm) sodium cathode materials with unique three-dimensional (3D) hierarchical structure overcoming the limitations of nanoparticles was successfully synthesized via a low-temperature solvothermal method. The synthesized hollow microspheres materials of Na3V2O2(PO4)2F, Ru-doped Na3V2O2(PO4)2F, and Ru-doped Na3V2O2(PO4)2F with RuO2 coating used in SIBs exhibited high reversible capacity, long cycle stability, and excellent rate performance. The formation mechanism of ordered hierarchical hollow microspheres controlled by the adsorption of hydrogen was systematically investigated via a series of experimentsand density functional theory (DFT) calculations providing insight to the design and synthesis of new electrode materials with the potential for future applications.