najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2025-16-6-837-849najo-1632Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХFormation of 2:1 Li-Fe-phyllosilicate with montmorillonite-like structure in hydrothermal conditionsОбразование Li-Fe-содержащего слоистого силиката типа 2:1 с монтмориллонитоподобной структурой в гидротермальных условияхИяхмаеваА. А.IyakhmaevaA. A.

Asiyat A. Iyakhmaeva

194021 St. Petersburg

acya.gitinova@gmail.comhttps://orcid.org/0000-0003-2674-9653ХраповаЕ. К.KhrapovaE. K.

Ekaterina K. Khrapova

194021 St. Petersburg

https://orcid.org/0000-0001-9449-9487ЛебедевЛ. А.LebedevL. A.

Lev A. Lebedev

194021 St. Petersburg

L.A.Lebedev@mail.ioffe.ruhttps://orcid.org/0000-0003-4519-0111ГлебоваН. В.GlebovaN. V.

Nadezhda V. Glebova

194021 St. Petersburg

Glebova@mail.ioffe.ruhttps://orcid.org/0000-0002-1530-7289СеменовВ. Г.SemenovV. G.

Valentin G. Semenov

194021 St. Petersburg

val_sem@mail.ruКопыловА. В.KopylovA. V.

Andrey V. Kopylov

St. Petersburg, 194223

akopylov@ritverc.comhttps://orcid.org/0000-0002-3938-3024КрасилинА. А.KrasilinA. A.

Andrei A. Krasilin

194021 St. Petersburg

ikrasilin@mail.ioffe.ruIoffe InstituteRussian FederationInstitute of Chemistry, St. Petersburg State UniversityRussian FederationRITVERC JSCRussian Federation202506012026166837849Copyright © Iyakhmaeva A.A., Khrapova E.K., Lebedev L.A., Glebova N.V., Semenov V.G., Kopylov A.V., Krasilin A.A., 20262026Ияхмаева А.А., Храпова Е.К., Лебедев Л.А., Глебова Н.В., Семенов В.Г., Копылов А.В., Красилин А.А.Iyakhmaeva A.A., Khrapova E.K., Lebedev L.A., Glebova N.V., Semenov V.G., Kopylov A.V., Krasilin A.A.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/1632

We report on hydrothermal synthesis and structural characterization of Li–Fe-montmorillonite (MMT). To date, this 2:1 type phyllosilicate attracts attention due to such properties as high ion mobility, hydrophilicity, electrical and thermal resistance. Due to that, various MMTs may serve as perspective components of Li-ion batteries (electrolyte and separator fillers, as well as protective buffer layer on top of Li metal anode). Scarce data on synthetic Li–Fe3+-MMTs motivated us to investigate formation process and structure features of such phyllosilicate by X-ray diffraction, UV-visible and Mossbauer spectroscopy, and other methods. We established critical Fe3+ content and temperature range needed for almost single-phase MMTs formation. Around 20 % of total Fe may occupy tetrahedral site of MMT layer. Thermal behavior of Li–Fe-MMT strongly depends on hydrothermal synthesis conditions because of different Li+ amount present in the interlayer space and in the layer vacancies.

Проведены гидротермальный синтез и физико-химическая характеризация Li-Fe-содержащего гидросиликата со структурой монтмориллонита (MMT). На сегодняшний день этот слоистый силикат типа 2:1 привлекает внимание такими свойствами, как высокая ионная подвижность, гидрофильность, электрическое сопротивление и термостойкость. Благодаря этому различные по составу MMT могут служить перспективными компонентами литий-ионных аккумуляторов. Процесс образования и структурные особенности Li-Fe-содержащего гидросиликата со структурой монтмориллонита исследовались с помощью рентгеновской дифракции, УФ-видимой и мёссбауэровской спектроскопии, а также другими методами. С помощью комплекса методов удалось установить критическое содержание Fe3+ и температурный диапазон, необходимые для образования практически однофазных MMT. Около 20% от общего содержания Fe может занимать тетраэдрическую позицию слоя MMT. Термическое поведение Li-Fe-MMT сильно зависит от условий гидротермального синтеза из-за различного количества Li+, присутствующего в межслоевом пространстве, а также в вакансиях октаэдрического подслоя.

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The authors declare that there are no conflicts of interest present.