Porosity, microstructure and electrochemistry of Na3V2(PO4)2F3/C prepared by mechanical activation
| Autor: | Valentin E. Sosenkin, Maria A. Kirsanova, Yury M. Volfkovich, Nina V. Kosova, Daria Semykina |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Annealing (metallurgy) Carbon Additive 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences 0104 chemical sciences Electronic Optical and Magnetic Materials Inorganic Chemistry Chemical engineering Specific surface area Materials Chemistry Ceramics and Composites Particle size Physical and Theoretical Chemistry 0210 nano-technology Mesoporous material Porosity |
| Zdroj: | Journal of Solid State Chemistry. 297:122041 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2021.122041 |
| Popis: | In this work, a detailed study of the mechanochemical approach to preparation of Na3V2(PO4)2F3/C cathode material with a porous structure is carried out. It is found that mechanical activation (MA) contributes to obtaining a single-phase material with a uniform distribution of elements at the nanoscale, reducing the particle size, and forming a mesoporous structure. On the other hand, a carbon additive prevents iron contamination during MA, suppresses particle growth upon MA and the following annealing, and enhances electrical conductivity. These two factors exhibit a synergetic effect that leads to a significant increase in the specific surface area of the cathode material and facilitate the embedding of carbon particles into the pores of Na3V2(PO4)2F3, thereby improving their contact with the matrix, increasing accessibility of electrolyte to the surface of electrode, and facilitating charge transfer, thus improving electrochemical properties as a result. |
| Databáze: | OpenAIRE |
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