This article is devoted to the study of the efficiency of thermal annealing of nanostructures for phase transformations of the FeCo – Fe2CoO4/Co3O4-spinel type, as well as the subsequent application of the obtained nanotubes as a basis for anode materials of lithium-ion batteries. The choice of these types of nanotubes for use as a basis for anode materials is due to their structure, as well as the great potential of using spinel structures in this area, interest in which is manifested due to the possibility of accelerating lithiation processes and long-term preservation of the specific capacity of batteries. During the study, it was found that for spinel structures, the formation of oxide growths on the surface of nanotubes, the presence of which is associated with oxidative processes during annealing, is observed. Testing the applicability of these structures as anode materials showed that the formation of oxide spinel structures of type Fe2CoO4/Co3O4 leads to an increase in the number of cycles by 1.5–1.7 times compared to the original nanotubes. The efficiency of increasing the lifetime of anode materials is due to an increase in resistance to degradation of Fe2CoO4/Co3O4 structures, due to the formation of oxide phases, leading to an acceleration of lithation processes.

Phase transformations in FeCo – Fe2CoO4/Co3O4-spinel nanostructures as a result of thermal annealing and their practical application

The paper presents the results of the study of structural, morphological, optical, and mechanical properties of lithium-containing ceramics obtained using the method of mechanochemical solid-phase synthesis. The purpose of this work is to assess the possibility of obtaining lithium-containing ceramics of the two-phase type, as well as the formation effect of the cubic phase of LiTiO2 on changes in the properties of ceramics. The relevance of this study is to obtain new data on the properties of lithium-containing ceramics, which have great prospects in their use as blanket materials for tritium reproduction. During the study, it was found that the formation of the LiTiO2 cubic phase leads to a change in the morphological features of ceramics, with the formation of sphere-like agglomerates of a nanoscale scale. An increase in the contribution of the LiTiO2 phase leads to a shift of the fundamental absorption edge, as well as the appearance of additional absorption bands. During mechanical tests for the determination of resistance to destruction by single compression, it was found that an increase in ceramic density, which is due to an increase in the contribution of the cubic phase, leads to an increase in resistance by 70–85%.

Study of the formation effect of the cubic phase of LiTiO 2 on the structural, optical, and mechanical properties of Li 2±x Ti 1±x O 3 ceramics with different contents of the X component

This paper presents the results of studying the processes of defect formation caused by irradiation with protons with an energy of 1.5 MeV and doses of 1 × 1015, 1 × 1016, 1 × 1017 ion/cm2 in ceramics based on aluminum nitride. The choice of radiation doses is due to the possibility of modeling atomic displacement (dpa) values of 0.56, 5.6, and 56 dpa, respectively. An analysis of structural changes showed a significant stability of the crystal structure at irradiation doses comparable to 0.56, 5.6, while an increase in the displacements up to 56 dpa leads to a significant increase in distortions of the crystal structure and its disordering due to the effect of accumulation of defects in the structure, as well as to hydrogenation processes. The totality of the data obtained indicates a fairly high degree of resistance to proton irradiation and the subsequent evolution of defects in the structure of nitride ceramics; however, at high doses of radiation, microcracks form in the surface layer, which leads to a sharp deterioration in the strength properties due to a large number of dislocation and point defects.

Study of hydrogenation processes in radiation-resistant nitride ceramics

Carbon nanotubes were produced by the do arc-discharge evaporation of graphite electrodes in an atmosphere of rarefied gas of He, Ar or CH4. The co-existence of carbon nanoparticles with the nanotubes was observed by both scanning electron microscopy (SEM) and transmission electron microscopy (TEM) . The growth conditions of the carbon nanotubes were not so limited as those of fullerenes, such as C60.

Production of Carbon Nanotubes

Green synthesis of Cordia myxa incubated ZnO, Fe2O3, and Co3O4 nanoparticle: Characterization, and their response as biological and photocatalytic agent

Synthesis, purification and microstructural characterization of nickel doped carbon nanotubes for spintronic applications

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Synthesis, purification and microstructural characterization of nickel doped carbon nanotubes for spintronic applications