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α-VPO4: A Novel Many Monovalent Ion Intercalation Anode Material for Metal-Ion Batteriesстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Scopus,
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 21 мая 2019 г.
- Авторы: Fedotov Stanislav S., Samarin Aleksandr Sh, Nikitina Victoria A., Stevenson Keith J., Abakumov Artem M., Antipov Evgeny V.
- Журнал: ACS applied materials & interfaces
- Том: 11
- Номер: 13
- Год издания: 2019
- Издательство: American Chemical Society
- Местоположение издательства: United States
- Первая страница: 12431
- Последняя страница: 12440
- DOI: 10.1021/acsami.8b21272
- Аннотация: In this paper, we report on a novel α-VPO4 phosphate adopting the α-CrPO4 type structure as a promising anode material for rechargeable metal-ion batteries. Obtained by heat treatment of a structurally related hydrothermally prepared KTiOPO4-type NH4VOPO4 precursor under reducing conditions, the α-VPO4 material appears stable in a wide temperature range and possesses an interesting “sponged” needle-like particle morphology. The electrochemical performance of α-VPO4 as the anode material was examined in Li-, Na-, and K-based cells. The carbon-coated α-VPO4/C composite exhibits 185, 110, and 37 mA h/g specific capacities respectively at the first discharge and around 120, 80, and 30 mA h/g at consecutive cycles at a C/10 rate. The considerable capacity drop after the first cycle in Li and Na cells is presumably due to irreversible alkali ion consumption taking place upon alkali-ion de/insertion. The EDX analysis of the recovered electrodes revealed an uptake of ∼23% of Na after the first discharge with significant cell parameter alteration validated by operando XRD measurements. In contrast to the known β-VPO4 anode materials, both Li and Na de/insertion into the new α-VPO4 proceed via an intercalation mechanism with the parent structural framework preserved but not via a conversion mechanism. The dimensionality of alkali-ion migration pathways and diffusion energy barriers was analyzed by the BVEL approach. Na-ion diffusion coefficients measured by the potentiostatic intermittent titration technique are in the range of (0.3–1.0)·10–10 cm2/s, anticipating α-VPO4 as a prospective high-power anode material for Na-ion batteries.
- Добавил в систему: Федотов Станислав Сергеевич