Synthesis and reversible Li-ion intercalation of a novel chromium-doped iron phosphate with an α-CrPO<sub>4</sub> structure

Matsaev, B.A.; Luchinin, N.D.; Trussov, I.A.; Presniakov, I.A.; Sobolev, A.V.; Golubnichiy, A.A.; Abakumov, A.M.; Antipov, E.V.; Fedotov, S.S.

Авторы: Matsaev Bulat A., Luchinin Nikita D., Trussov Ivan A., Presniakov Igor A., Sobolev Alexey V., Golubnichiy Alexander A., Abakumov Artem M., Antipov Evgeny V., Fedotov Stanislav S.
Журнал: Journal of Materials Chemistry A
Год издания: 2025
Издательство: Royal Society of Chemistry
Местоположение издательства: United Kingdom
DOI: 10.1039/d5ta03078a
Аннотация: Li-ion batteries based on environmentally friendly, cheap, and available elements are in high demand for sustainable economic, societal, and technological development. In this paper, we report on a novel series of iron-based phosphates, a-Fe1−xCrxPO4, adopting the a-CrPO4-type structure, capable of Li-ion intercalation in a high potential region. These are obtained by thermal decomposition of structurally related KTiOPO4-type NH4Fe1−xCrxPO4F precursors under oxidizing conditions. a-Fe0.75Cr0.25PO4 particles reveal a porous “rugby-ball” morphology with a preferred < 100 > orientation along the longest dimension, as examined by scanning transmission electron microscopy and electron diﬀraction. The crystal structure is reﬁned based on synchrotron powder X-ray diﬀraction, assisted by 57Fe Mössbauer and infrared spectroscopy techniques. The carbon-coated a-Fe0.75Cr0.25PO4/C electrode material exhibits a single-phase de/intercalation mechanism of Li+ intercalation with an 88 mA h g−1 discharge speciﬁc capacity at C/10 and the Fe3+/Fe2+ redox potentials approaching ∼3.54 and 3.78 V vs. Li+/Li, being the highest among the known Fe-based phosphates. The extended cycling at 1C reveals ∼98.5%capacity retention after 250 cycles with 99.8(3)% coulombic eﬃciency. This research highlights the applied synthesis route and lays the groundwork for designing and perfecting new iron-based phosphates with promising electrochemical properties as electrode materials for metal-ion batteries.
Добавил в систему: Антипов Евгений Викторович

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