Belt-like tin oxide (SnO2) materials are synthesized by electrodeposition and thermal oxidation method. The microparticles are of 5–20 µm in length size and 300-800 nm of thickness. The electrical properties of anode materials based on such structures are studied using an impedance spectroscopic technique. The SnO2 particles are characterized by scanning electron microscopy and impedance spectroscopy. Electrochemical tests are performed using belt-like SnO2 as the negative electrode for a lithium cell. 

https://aip.scitation.org/doi/pdf/10.1063/5.0100467

Belt-like SnO2 structures for lithium batteries

Our research is mainly focused on solving problems related to the production of hydrogen and its storage, as well as the creation of autonomous energy systems using renewable energy sources. Technological solutions for green energy depend on the development of new materials with desired properties that are able to reversibly accumulate hydrogen under appropriate environmental conditions (temperature, pressure) and on the technological processes allowing to obtain molecular hydrogen without significant energy consumption. The creation of materials with fundamentally new characteristics is inextricably linked with the production of nanoscale systems with properties that are controlled at the atomic and molecular level. The review considers the results of studies on the possibilities of using various nanostructures of titanium dioxide known for its catalytic properties and high stability in various applications of hydrogen energy. Much attention is paid to the promising direction of solid-state storage of hydrogen using hydride pastes and high-entropy alloys. 

Titanium Dioxide for Hydrogen Economy: a Brief Review

Lithium-ion batteries are still efficient and reliable energy storage systems and are widely used in portable electronics and electric vehicles. This review describes the types of currently existing lithium batteries, systems with anodes, cathodes and electrolytes made of various materials, and methods for their study. Specifically, it begins with a brief introduction to the principles of lithium-ion batteries operation and cell structure, followed by an overview of battery research methods. Particular attention is paid to the use of nanosized particles for the modification of electrodes and electrolytes, as well as the copolymerization of individual polymers of the gel-polymer electrolyte. The review analyzes possible future developments and prospects for post-lithium batteries.

/pdf/review-of-materials-for-electrodes-and-electrolytes-of-2texp5os.pdf

Review of Materials for Electrodes and Electrolytes of Lithium Batteries

https://iopscience.iop.org/article/10.1088/1757-899X/1008/1/012043/pdf

Nanowhiskers for lithium battery anode

Magnetic shape memory alloys are a specific subtype of shape memory materials. The magnetic deformation phenomenon causes the high research interest in these alloys. Thus, in one of the most promising alloys based on Ni–Mn–Ga, using a magnetic field, it is possible to achieve changes in a single crystal size by up to 10 % due to the reorientation of the magnetic field in magnetic domains. The high magnetic deformation is directly related to the high mobility of twin boundaries separating two domains. In this work, the authors used a composite piezoelectric oscillator at a frequency of about 100 kHz to determine the influence of such defects as dislocations and twin boundaries on the mechanical characteristics of Ni49Mn30Ga21. The authors investigated the features of temperature dependences of internal friction in the samples before and after deformation and provided the amplitude dependences of these characteristics. In the studied single-crystal martensitic phase, the transition from the tetragonal phase to the orthorhombic phase was detected at 235 K. In the Ni–Mn–Ga tetragonal phase, the formation of new defects contributes to the more pronounced and early onset of amplitude-dependent internal friction. At lower loads, the successive stages occur associated with the processes of dislocations and twin boundaries movements inside the Cottrell clouds, dislocations and twin boundaries movement outside the Cottrell clouds, and supposedly, the slowdown of dislocations and twin boundaries movement due to their interaction. As well as internal friction, the authors studied the change in Young’s modulus. Its decrease at all temperatures is most pronounced in the samples with the defective structures. The study identified that in the orthorhombic phase, it is possible to observe the internal friction dependence on the deformation amplitude at a lower load due to an increase in the twin boundaries mobility with increasing temperature.

The influence of dislocation and twin structures on the mechanical characteristics of Ni–Mn–Ga alloys at ultrasonic frequencies

/pdf/functional-nanomaterials-for-lithium-ion-batteries-3memkox5.pdf

Functional nanomaterials for lithium-ion batteries

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Nanowhiskers for lithium battery anode

Review of Materials for Electrodes and Electrolytes of Lithium Batteries

The influence of dislocation and twin structures on the mechanical characteristics of Ni–Mn–Ga alloys at ultrasonic frequencies

Functional nanomaterials for lithium-ion batteries