In situ Study of Solid-State Synthesis of Li4Ti5O12–Li2TiO3 and Li4Ti5O12–TiO2 Composites | Sciact - CRIS-система Института катализа

In situ Study of Solid-State Synthesis of Li4Ti5O12–Li2TiO3 and Li4Ti5O12–TiO2 Composites Научная публикация

Журнал

Journal of Solid State Chemistry
ISSN: 0022-4596 , E-ISSN: 1095-726X

Вых. Данные

Год: 2022, Том: 313, Номер статьи : 123302, Страниц : 10 DOI: 10.1016/j.jssc.2022.123302

Ключевые слова

Li4Ti5O12, LTO-Li2TiO3, LTO-TiO2 composites, Solid-state synthesis, Grain boundary

Авторы

Kozlova Anna ^1,2 , Uvarov Nikolai ^1,2 , Sharafutdinov Marat ^1,3 , Gerasimov Evgeniy ⁴ , Mateyshina Yuliya ^1,2

Организации

1	Institute of Solid State Chemistry and Mechanochemistry, SB RAS, Kutateladze Str. 18, Novosibirsk, 630128, Russia
2	Novosibirsk State Technical University, K.Marksa Ave., 20, Novosibrsk, 630073, Russia
3	Synchrotron Radiation Facility SKIF, Boreskov Institute of CatalysisSB RAS, 630559, Nikol'skiy Prospekt 1, Kol'tsovo, Russia
4	Boreskov Institute of Catalysis SB RAS, Novosibirsk, 630090, Russia

Информация о финансировании (1)

Министерство науки и высшего образования Российской Федерации (с 15 мая 2018)

FSUN-2020-0008

Lithium titanate Li4Ti5O12 (LTO) with a spinel structure has been actively studied as a potential candidate for the negative electrode material in lithium ion batteries. In this work, LTO-Li2TiO3 (LTC) and LTO-TiO2 (LTT) composites were investigated. The use of powder X-ray diffraction (PXRD) with synchrotron radiation (SR) made it possible to trace the process of formation of the composites in situ and obtain information on changes in the phase composition of reaction products depending on the temperature and the ratio of the initial reagents, Li2CO3 and TiO2. It was found that irrespective of the initial ratio of reagents (lack of Li2CO3, stoichiometric ratio or excess of Li2CO3 for LTC, LTO and LTT samples, respectively), the synthesis proceeds in three stages, including formation of nanocrystalline Li2TiO3 as intermediate phase. LTC composites consist of microparticles of Li4Ti5O12phase covered by a layer of Li2TiO3phase, whereas in LTT composites large particles of TiO2 phase are surrounded by microparticles of LTO phase. Electrochemical studies showed that LTT composites have relatively low capacity as expected assuming that TiO2 is electrochemically inactive phase in the composites. In contrast, LTC composites have a specific capacity of 187 mAh/g that exceeds the theoretically expected capacity values. According to high-resolution electron microscopy data (HREM), LTC composites have a large number of Li4Ti5O12/Li2TiO3 interfaces, which are diffuse and seem to be coherent due to similarity of crystal structures LTO and Li2TiO3.

Kozlova A. , Uvarov N. , Sharafutdinov M. , Gerasimov E. , Mateyshina Y.
In situ Study of Solid-State Synthesis of Li4Ti5O12–Li2TiO3 and Li4Ti5O12–TiO2 Composites
Journal of Solid State Chemistry. 2022. V.313. 123302 :1-10. DOI: 10.1016/j.jssc.2022.123302 WOS Scopus РИНЦ CAPlusCA OpenAlex СКИФ ID

Поступила в редакцию:	31 мар. 2022 г.
Принята к публикации:	31 мая 2022 г.
Опубликована online:	6 июн. 2022 г.
Опубликована в печати:	1 сент. 2022 г.

Web of science:	WOS:000813376700010
Scopus:	2-s2.0-85132318472
РИНЦ:	48722036
Chemical Abstracts:	2022:1646973
Chemical Abstracts (print):	180:197597
OpenAlex:	W4281675021
СКИФ ID:	2361

БД	Цитирований
Scopus	6
РИНЦ	7
Web of science	6
OpenAlex	7