Unraveling the transition from alluaudite to triphylite phases during LiFePO4 hydrothermal synthesis

Kurashkina, A.A.; Alekseeva, A.M.; Soboleva, I.S.; Sobolev, A.V.; Mironov, A.V.; Marikutsa, A.V.; Mikheev, I.V.; Shatalova, T.B.; Presniakov, I.A.; Drozhzhin, O.A.; Antipov, E.V.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 25 июня 2025 г.

Авторы: Kurashkina Anna A., Alekseeva Anastasia M., Soboleva Iana S., Sobolev Alexey V., Mironov Andrey V., Marikutsa Artem V., Mikheev Ivan V., Shatalova Tatyana B., Presniakov Igor A., Drozhzhin Oleg A., Antipov Evgeny V.
Журнал: CrystEngComm
Том: 27
Номер: 24
Год издания: 2025
Издательство: Royal Society of Chemistry
Местоположение издательства: United Kingdom
Первая страница: 4209
Последняя страница: 4220
DOI: 10.1039/d5ce00097a
Аннотация: Lithium iron phosphate (LFP) and its derivatives are an extremely promising class of cathode materials for lithium-ion batteries with an ever-expanding range of applications. The development of improved, cost-effective methods to synthesize this class of materials is a challenging task, and in this work, we explored the synthesis of LiFePO4 under hydrothermal conditions without using the traditional three-fold lithium excess. By partially replacing LiOH with NaOH, we were able to synthesize single-phase LFP demonstrating good electrochemical performance. Studying the synthesis stages, we identified an unexpected alluaudite-triphylite phase transformation. A careful examination of this intermediate phase through powder X-ray diffraction, Mössbauer spectroscopy, Fourier-transform infrared spectroscopy, and inductively coupled plasma atomic emission spectroscopy brought us to discover a new sodium iron bis(hydrogen phosphate) phosphate — Na0.7Fe3(HPO4)2(PO4) — that forms at the first stage of the synthesis. Further hydrothermal treatment facilitates Na → Li exchange, and instability of the alluaudite-type framework with high Li content results in the formation of the triphylite LiFePO4 phase.
Добавил в систему: Дрожжин Олег Андреевич

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Unraveling the transition from alluaudite to triphylite phases during LiFePO4 hydrothermal synthesisстатья

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