Formation of Nanostructured Li4Ti5O12-Based Composites upon Hydrothermal Treatment of Their Components

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Abstract

Nanostructured Li4Ti5O12-based composites in the form of microspheres consisting of randomly packed prism-like particles have been prepared via hydrothermal treatment of TiO2 xerogel in aqueous LiOH solutions, followed by calcination of the reaction products at t ≥ 550°C. The phase composition of the hydrothermally prepared spherical particles has been shown to correspond to α-Li2TiO3. According to elemental analysis data, the titanium and oxygen were nonuniformly distributed over the microspheres. Sequential calcination of the microspheres at t ≤ 750°C led first to the α-Li2TiO3 → β-Li2TiO3 phase transformation and then to the formation of nanostructured Li4Ti5O12 spinel or spinel-based composites (Li4Ti5O12/TiO2 and Li4Ti5O12/β-Li2TiO3). The Li4Ti5O12 microspheres calcined at 750°C consisted of not only the major crystalline phase but also X-ray amorphous TiO2 (anatase) and β-Li2TiO3 as impurity phases, which could not be detected by X-ray diffraction.

About the authors

T. M. Zima

Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences; Novosibirsk State Technical University

Email: zima@solid.nsc.ru
630128, Novosibirsk, Russia; 630073, Novosibirsk, Russia

A. V. Ukhina

Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences

Email: kurmaschov@gmail.com
Russian, 630090, Novosibirsk

N. F. Uvarov

Institute of Solid State Chemistry and Mechanochemistry SB RAS; Novosibirsk State University

Author for correspondence.
Email: YuliaM@solid.nsc.ru
Russian Federation, Novosibirsk; Novosibirsk

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Copyright (c) 2023 Т.М. Зима, А.В. Ухина, Н.Ф. Уваров