The rapid microwave-assisted hydrothermal synthesis of NASICON-structured Na₃V₂O_2x (PO₄)₂F_3-2x (0 < x ≤ 1) cathode materials for Na-ion batteries.

ABSTRACT: NASICON-structured Na₃V₂O_2x (PO₄)₂F_3-2x (0 < x ≤ 1) solid solutions have been prepared using a microwave-assisted hydrothermal (MW-HT) technique. Well-crystallized phases were obtained for x = 1 and 0.4 by reacting V₂O₅, NH₄H₂PO₄, and NaF precursors at temperatures as low as 180-200 °C for less than 15 min. Various available and inexpensive reducing agents were used to control the vanadium oxidation state and final product morphology. The vanadium oxidation state and O/F ratios were assessed using electron energy loss spectroscopy and infrared spectroscopy. According to electron diffraction and powder X-ray diffraction, the Na₃V

SUBMITTER: Burova D 

PROVIDER: S-EPMC9065364 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature