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Phase Transformations and Charge Ordering during Li+ Intercalation into Hollandite-Type TiO2 Studied by Operando Synchrotron X-ray Powder Diffractionстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 8 апреля 2020 г.
- Авторы: Drozhzhin Oleg A., Grigoriev Vladislav V., Alekseeva Anastasia M., Ryazantsev Sergey V., Tyablikov Oleg A., Chernyshov Dmitry, Abakumov Artem M., Antipov Evgeny V.
- Журнал: European Journal of Inorganic Chemistry
- Том: 2020
- Номер: 9
- Год издания: 2020
- Издательство: John Wiley & Sons Ltd.
- Местоположение издательства: United Kingdom
- Первая страница: 743
- Последняя страница: 748
- DOI: 10.1002/ejic.201901153
- Аннотация: Hollandite‐type TiO2 with uniform submicron‐sized particles was prepared using the treatment of K1.2Ti8O16 by KBrO3 in an H2SO4 solution. The electrode material exhibited a 150 mAh g–1 reversible capacity with an average working potential of 1.75 V vs. Li/Li+. Phase transformations taking place during Li+ (de)intercalation were studied by means of synchrotron X‐ray powder diffraction in operando regime. The lowering of symmetry from tetragonal I4/m to monoclinic I2/m at the beginning of the lithiation was observed. The monoclinic distortion was driven by the Ti3+/Ti4+ charge ordering and the location of the Li+ cations at the hollandite tunnel walls in the five‐fold oxygen coordination. The opposite variation of a and b unit cell parameters during charge‐discharge resulted in a negative overall volume change of –1 % at the lithiated state compared to the initial oxide phase. This value is several times lower than the values for other TiO2 polymorphs such as rutile, anatase or TiO2(B) are.
- Добавил в систему: Дрожжин Олег Андреевич