Changes in the Structural and Morphological Parameters of Fe2O3/SiO2, as a Basis for the Electrode Material of Lithium Power Sources, Due to Shock-Vibrating Treatment

Abstract

Using the method of X-ray diffraction, the effect of shock-vibration treatment on the structural parameters and phase composition of mixtures of silicon dioxide and alpha iron oxide was studied. From these results, has been found that the shock-vibration treatment of oxides mixture leads to an increase in the coherent scattering region of crystalline α-Fe2O3. We obtained SEM images of composites before and after treatment. From the SEM images it is seen that the processing is accompanied by fragmentation of the aggregates, uniform placement of the nanoparticles between each other and the formation of new denser agglomerates. Electron-microscopic study of mixtures using TEM was performed, which showed that the treatment leads to a lay-up of particles each other with the formation of interatomic interaction between them, which is consistent with the results of ultra-soft X-ray emission spectroscopy. The electrochemical properties of LPS, with electrodes based on mixtures before and after treatment, in galvanostatic mode were investigated. It is found that the charge capacity of the LPS with the electrode based on the mixture with the maximum concentration of α-Fe2O3 after treatment is reduced by half. In addition, such LPS doesn’t have the following cycling, which is most likely to be associated with an increase inthe recombination probability of lithium ions on the surface of the electrode material due to the increase in the population of Op-electrons near the Fermi level and compaction of the nanocomposite.

Keywords

• sio2
• α-fe2o3
• скануюча електронна мікроскопія
• трансмісійна електронна мікроскопія
• рентгеноструктурний аналіз
• структура
• параметри ґратки
• область когерентного розсіювання
• морфологія
• розрядна ємність