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

Autor: Shraer, Semyon D., Luchinin, Nikita D., Trussov, Ivan A., Aksyonov, Dmitry A., Morozov, Anatoly V., Ryazantsev, Sergey V., Iarchuk, Anna R., Morozova, Polina A., Nikitina, Victoria A., Stevenson, Keith J., Antipov, Evgeny V., Abakumov, Artem M., Fedotov, Stanislav S.
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Zdroj: Nature Communications; 7/14/2022, Vol. 13 Issue 1, p1-10, 10p
Abstrakt: 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 at 5.7 A g−1 is also reported for the same cell configuration. Through ex situ and operando structural characterizations, we also demonstrate that the reversible Na-ion storage at the positive electrode occurs mostly via a solid-solution de/insertion mechanism. The development of high-capacity and high-voltage electrode materials can boost the performance of sodium-based batteries. Here, the authors report the synthesis of a polyanion positive electrode active material that enables high-capacity and high-voltage sodium battery performance. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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