电极
钒
电解质
材料科学
阴极
电化学
化学工程
化学
物理化学
工程类
冶金
作者
Semyon D. Shraer,Nikita D. Luchinin,Ivan A. Trussov,Dmitry A. Aksyonov,Anatolii V. Morozov,Sergey V. Ryazantsev,Anna Iarchuk,Polina A. Morozova,Victoria A. Nikitina,Keith J. Stevenson,Evgeny V. Antipov,Artem M. Abakumov,Stanislav S. Fedotov
标识
DOI:10.1038/s41467-022-31768-5
摘要
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.
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