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


Kokhmetova S. Kan T. Malchik F. Galeyeva A. Djenizian T. Kurbatov A.
September 2021Elsevier Ltd

Materials Today Communications
2021#28

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 materials 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.

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

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Center of Physical-Chemical Methods of Research and Analysis, Al-Farabi Kazakh National University, Almaty, 050012, Kazakhstan
Mines Saint-Etienne, Center of Microelectronics in Provence, Department of Flexible Electronics, Gardanne, F-13541, France

Center of Physical-Chemical Methods of Research and Analysis
Mines Saint-Etienne

10 лет помогаем публиковать статьи Международный издатель

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