Effect of the MoS2 surface layer on the kinetics of intercalation processes in the NaFe(SO4)2/C composite

Saule Kokhmetova, Tatyana Kan, Fyodor Malchik, Alina Galeyeva, Thierry Djenizian, Andrey Kurbatov

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The article deals with the problem of electrochemical conversion of low-conductive materials considering an example of eldfellite-structured NaFe(SO4)2. The applying process of electronically-conducting material on NaFe(SO4)2 surface by means of milling providing multiple contacts with the conductive phase and thus delivering electrons to the active material is given a detailed study. The material which has point contact conductivity (Carbon black) is proposed to replace partially by the layer-structured ones (MoS2), thus ensuring full coverage of the active material coating, and, appropriately, wider area of charge delivery to the material's surface. A schematic diagram is proposed of the intercalation process into the active material particles covered with a layer of electron- and ion-conductive additive MoS2. It follows from the scheme that the extreme dependence found experimentally for such electrochemical parameters as the charge/discharge capacity, CV peak current, diffusion coefficient (in solid phase) and half-wave intercalation potential is associated with the thickness of the applied coating. The detected extremum in the dependence of the de/intercalation parameters on the coating thickness is induced by the potential drop during the charge transfer through the coating phase and is confirmed by a quantitative analysis of the process model.

Original languageEnglish
Article number102723
JournalMaterials Today Communications
Volume28
DOIs
StatePublished - Sep 2021
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2021 Elsevier Ltd

Funding

This research was funded by the Science Committee of the Ministry of Education and Science of the Republic of Kazakhstan (Grant No. AP09260371 ).

FundersFunder number
Ministry of Education and Science of the Republic of KazakhstanAP09260371

    Keywords

    • Charge transfer
    • Conductive coatings
    • Eldfellite
    • Intercalation
    • Sodium ion batteries

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