Development of vanadium-based polyanion positive electrode active materials for high-voltage sodium-based batteries.

ABSTRACT: Polyanion compounds offer a playground for designing prospective electrode active materials for sodium-ion storage due to their structural diversity and chemical variety. Here, by combining a NaVPO₄F composition and KTiOPO₄-type framework via a low-temperature (e.g., 190 °C) ion-exchange synthesis approach, we develop a high-capacity and high-voltage positive electrode active material. When tested in a coin cell configuration in combination with a Na metal negative electrode and a NaPF₆-based non-aqueous electrolyte solution, this cathode active material enables a discharge capacity of 136 mAh g^-1 at 14.3 mA g^-1 with an average cell discharge voltage of about 4.0 V. Furthermore, a specific discharge capacity of 123 mAh g^-1 a

SUBMITTER: Shraer SD 

PROVIDER: S-EPMC9283384 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature