najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМОnajo-1552Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХFormation of 2:1 Li-Fe-phyllosilicate with montmorillonite-like structure in hydrothermal conditionsIyakhmaevaAsiyat Aacya.gitinova@gmail.comKhrapovaEkaterina Ke.k.khrapova@mail.ioffe.ruLebedevLev Al.a.lebedev@mail.ioffe.ruGlebovaNadezhda VGlebova@mail.ioffe.ruSemenovValentin Gval_sem@mail.ruKopylovAndrey Aakopylov@ritverc.comhttps://orcid.org/0000-0002-3938-3024KrasilinAndrei Aikrasilin@mail.ioffe.ruIoffe InstituteRussian FederationSaint Petersburg State UniversityRussian FederationRITVERC JSCRussian Federation2025050220261661552Copyright © Iyakhmaeva A.A., Khrapova E.K., Lebedev L.A., Glebova N.V., Semenov V.G., Kopylov A.A., Krasilin A.A., 20262026Iyakhmaeva A.A., Khrapova E.K., Lebedev L.A., Glebova N.V., Semenov V.G., Kopylov A.A., Krasilin A.A.Iyakhmaeva A.A., Khrapova E.K., Lebedev L.A., Glebova N.V., Semenov V.G., Kopylov A.A., Krasilin A.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/1552

Here, 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 Mössbauer 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.

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