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The evolution of redox potential in pyrochlore-based intercalation anodes for potassium-ion batteriesстатья Исследовательская статья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Tashlanov Mikhail Yu, Aksyonov Dmitry A., Marshenya Sergey N., Mikheev Ivan V., Antipov Evgeny V., Fedotov Stanislav S.
- Журнал: Journal of Alloys and Compounds
- Год издания: 2025
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 180612
- DOI: 10.1016/j.jallcom.2025.180612
- Аннотация: Tungsten oxides and related compounds have been known as negative electrode materials for metal-ion batteries for decades. Despite their structural flexibility, most studies has largely focused on lithium-based energy storage systems. Here, we investigated KMxW2−xO6 (M = Ta, Nb, Ti, Cr, Al) oxides adopting a defect pyrochlore structure as intercalation-type anodes for potassium-ion batteries. Crystal structure, chemical composition, and thermal behavior of all representatives were comprehensively characterized. Electrochemical testing in K half-cells revealed average operating potentials of the considered pyrochlores to be in the range of 1.1-1.3V vs. K+/K, consistent with density functional theory predictions. The variation in the electrochemical performance among the KMxW2−xO6 was correlated with differences in electronic conductivity of M dopants, as validated by M density of states calculations. Through regression analysis of Rietveld-refined structural data, a strong linear dependence (ρ = 0.96) between the average intercalation potential of KMxW2−xO6 and the intrinsic parameters (ionic radius and electronegativity) of the M metal was established. This work not only advances fundamental understanding of tungsten-based oxygen-deficient pyrochlores but also paves the way for their development as potassium-ion intercalation hosts.
- Добавил в систему: Михеев Иван Владимирович
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