The Dependence between the Structural-morphological Features of SiO2/TiO2 Mixesand Discharge Capacities of Lithium Power Sources

Authors Yu.V. Yavorsky1 , Ya.V. Zaulichny1 , V.M. Gunko2 , M.V. Karpets3 , V.V. Mokliak4, A.B. Hrubiak4

1Faculty of Engineering and Physics, National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", 35, Politechnichna St., 03056 Kyiv, Ukraine

2Chuiko Institute of Surface Chemistry, National Academy of Sciences of Ukraine, 17, General Naumov St., 03164 Kyiv, Ukraine

3Institute of Problems of Materials Science named after Frantsevich, National Academy of Sciences of Ukraine, 3, Academician Krzhizhanovsky St., 03680 Kyiv, Ukraine

4G.V. Kurdyumov Institute of Metal Physics, National Academy of Sciences of Ukraine, 36, Academician Vernadsky Blvd., 02000 Kyiv, Ukraine

Issue Volume 11, Year 2019, Number 6
Dates Received 19 September 2019; revised manuscript received 01 December 2019; published online 13 December 2019
Citation Yu.V. Yavorsky, Ya.V. Zaulichny, et al., J. Nano- Electron. Phys. 11 No 6, 06012 (2019)
PACS Number(s) 62.23.Pq, 71.20.Nr, 82.45.Fk, 82.47.Aa
Keywords Mechanical treatment, Distribution of valence electrons, Coherent field, Cathode material, Lithium current sources, Point chemical analysis, Spectra (19) .

The effect of mechanical treatment at microbraker (MBT) on the structural parameters and phase composition of mixtures of silicon and titanium dioxides was studied using the method of X-ray structural analysis. Transmission electron microscopy (TEM) revealed a change in the morphological features of nanoscale powders. The change in the discharge capacities of lithium power sources (LPS) due to the mechanical treatment of the cathode material base was analyzed by galvanostatic cycling. This paper highlights the relationship between changes in structural and morphological features, electronic structure, and charge capacities of LPS. From the comparison of SEM and TEM images of mixtures of titanium and silicon oxides before and after MBT, it is established that due to MBT, the agglomerates of the initial components are simultaneously crushed with perfect mixing of oxideparticles between each other and new agglomerates with a denser structureare formed. The established agglomeration is accompanied by a change in the lattice parameter c with a change in the coherent scattering regions of crystalline TiO2 depending on its concentration in the mixtures. From the results of galvanostatic cycling, it is found that the charge capacity of the LPS with cathodes based on the mixture after treatment is somewhat larger compared to the charge capacity of the LPS with the cathode based on the initial mixture. The results of the analysis show that the increase of the charge capacity of the LPS with the cathode on the basic mixtures after treatment is a consequence of the redistribution of Sisd-, Tisd- and Op-valence electrons and changes of structural-morphological features in the formation of interatomic interaction between oxide particles.

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