Andrey Suzdaltsev

Ural Federal University | UrFU · Laboratory of Electrochemical Devices and Materials

The possibility of using silicon-based anodes in lithium-ion power sources is actively investigated due to the increased lithium capacitance of silicon. This work reports the preparation of submicron silicon fibers on glassy carbon in KI–KF–KCl–K2SiF6 melt at 720°C. For this purpose, the parameters of silicon electrodeposition in the form of fibers...

Silicon and its materials are widely used in metallurgy, micro- and nano-electronics, solar energy, and are also promising materials for anodes of lithium-ion power sources with increased specific capacity. The expansion of application areas of silicon with controlled morphology necessitates the development of new energy–efficient methods of its pr...

Due to increased lithium capacity silicon and silicon-based materials appear promising for their use in high-power lithium-ion power sources. In the present work a comparative analysis of the electrochemical behavior of electrodeposited thin films, submicron fibers and needles during their multiple lithiation and delithiation as part of the anode h...

The unique properties of zirconium silicides attract the attention of a large number of authors from various scientific fields. Expansion of application methods also poses the challenge of developing new, more environmentally friendly and affordable methods of production. The most environmentally friendly method without equipment requirements is th...

In the conditions of resource saving and carbon footprint reduction, the development of oxygen–releasing anodes for technologies of production of important metals and alloys by electrolysis of molten salts seems to be an urgent task. To determine the degree of “inertness” of a particular anode material, data on the kinetics and mechanism of the ano...

Silicon is one of the promising anode materials for lithium-ion batteries with enhanced performance. However, the degradation of silicon during lithiation/delithiation is still the main problem that prevents it commercial use as electrodes. In this work the behavior of a silicon film of about 5–6 µm thick electrodeposited from LiCl-KCl-CsCl-K2SiF6...

The possibility of electrochemical synthesis of zirconium silicides by electrolysis of KCl-K2SiF6 melt with ZrO2 additives at 790 °C has been studied. To determine the synthesis parameters, the kinetics and some features of the mechanism of the cathodic process in the investigated melt on glassy carbon were studied by cyclic chronovoltammetry and c...

In this work, the effect of electrolysis modes and their parameters on the morphology of the silicon deposits on glassy carbon were studied. In direct current mode it was found that an increase in current density and deposition time changes the morphology of the silicon from a coating to a deposit with a complex surface. Scanning electron microscop...

In this work, the interaction of K2SiF6 with LiCl–KCl-CsCl chloride melts was studied using cyclic voltammetry and atomic emission spectroscopy analysis, depending on their cationic composition in the temperature range from 550 to 665 °C. It has been determined that an increase in the CsCl/LiCl ratio leads to a decrease in the rate of decomposition...

Currently, the development of oxygen-evolving anodes for eco-friendly technologies to produce important metals and alloys by electrolysis of molten salts seems to be an urgent task. To determine the degree of “inertness” of a particular anode material, data on the kinetics and mechanism of the anode process on an ideal material not subject to oxida...

The possibility of using Si-based anodes in lithium-ion batteries is actively investigated due to the increased lithium capacity of silicon. The paper reports the preparation of submicron silicon fibers on glassy carbon in the KI–KF–KCl–K2SiF6 melt at 720 °C. For this purpose, the parameters of silicon electrodeposition in the form of fibers were d...

The possibility of using Si-based anodes in lithium-ion batteries is actively investigated due to the increased lithium capacity of silicon. The paper reports the preparation of submicron silicon fibers on glassy carbon in the KI–KF–KCl–K2SiF6 melt at 720°C. For this purpose, the parameters of silicon electrodeposition in the form of fibers were de...

Nowadays, the active search for an anode material, which can be used in lithium-ion current sources, takes place. The potential anode materials are transition metal oxides (SnO2, NiO and others). In this work, submicron NiO powder was obtained using the thermal decomposition of Ni(CH3COO)2·4H2O. Besides, a NiO/C composite anode was fabricated and i...

Multilayer structures based on semiconductor materials are being actively studied for their use in various solar energy detectors and converters. Due to the combination of properties of individual materials, an overall improvement of performance characteristics can be achieved in their multilayer design. In the present work, a technique for the pre...

The work is aimed at studying the kinetics of silicon electrodeposition from different chloride melts in order to select both optimal melt compositions and their electrolysis parameters. The study was carried out in KCl, KCl-CsCl and LiCl-KCl-CsCl melts with the addition of K2SiF6 at different temperatures depending on the melting point of each sys...

This reprint is focused on analyzing modern trends and recent advances in the synthesis of new metal-based composite materials. Such composites are increasingly used in civil, automotive, and aerospace engineering, shipbuilding, robotics, nuclear power, portable energy devices, biomedicine, electronic devices, and portable aircraft. Non-ferrous met...

Due to the possibility of controlling composition and morphology, one of the promising methods for obtaining silicon and its materials is the electrolysis of molten salts. However, this requires data on the influence of various factors on the kinetics of silicon electrodeposition. In this work, an effect of the cathode substrate material on the kin...

Currently, research is being actively conducted aimed at developing materials and devices for obtaining and storing energy from renewable sources. In particular, attention is paid to the conversion of solar energy with a view to its subsequent storage in lithium-ion current sources or hydrogen storage devices. In this regard, the possibility of ele...

Silicon and silicon-based materials find extensive applications in metallurgy, microelectronics, and other emerging industries. The field of use of synthesized silicon varies based on its morphology and purity. This study employs voltammetry, galvanostatic electrolysis, and scanning electron microscopy to examine the impact of KI surfactant (in mol...

The present paper is devoted to obtaining new fundamental data on the electrochemical behavior of oxygen-evolving anodes in fluoride-oxide melts. In this work, the function of platinum and basics of its anode behavior as an ideal oxygen-releasing anode during electrolysis of the low-temperature KF-AlF3-Al2O3-based melt were studied by potentiometri...

The Special Issue is aimed at analyzing modern trends and recent advances in the synthesis of new metal-based composite materials [...]

Compositions of ultrafine Si and C particles are promising anode materials for lithium-ion power sources with improved energy characteristics. In the work, samples of lithium-ion power sources with an anode made of ultrafine SiC fibers, as well as mixtures of SiC fibers with graphite (C/SiC) and electrolytically deposited submicron silicon fibers (...

In this work, we studied the kinetics of the cathodic process and the regularities of the initial stages of silicon electrodeposition using cyclic voltammetry, square-wave voltammetry, and chronoamperometry on a glassy carbon substrate from a LiCl-KCl-CsCl melt with K2SiF6 at a temperature of 545±5°C. It is shown that the cathodic process of silico...

The purification of molten salts from admixtures as well as the effective control of admix-ture concentration has attracted researchers' interests. In the present paper, the possibility of the electrochemical purification of PbCl2 from PbO and the effective control over the oxide ions concentration in molten PbCl2 is studied at the temperature of 5...

Due to its abundance in nature as well as its properties, silicon is one of the most demanded materials in various industry areas. Currently, metallurgical silicon is obtained by carbothermic reduction of quartz. In order to obtain solar grade silicon, the last should be treated by hydrochlorination and multiple chlorination. This brief review pres...

The electrochemical behavior of scandium in halide melts is of interest both from the point of view of developing new electrochemical methods for producing scandium and its materials, and from the point of view of simulating electrochemical behavior of fission products during pyrochemical processing of spent nuclear fuel in molten salts. Using the...

Nowadays, research aimed at the development of materials with increased energy density for lithium-ion batteries are carried out all over the world. Composite anode materials based on Si and C ultrafine particles are considered promising due to their high capacity. In this work, a new approach for carbothermal synthesis of C/SiC composite mixtures...

Silicon and silicon-based materials are increasingly used in microelectronics , metallurgy and power generation. To date, the active study aimed at the development of silicon materials to be used in devices for solar energy conversion, accumulation and storage is underway. In addition , silicon is a promising anode material for lithium-ion fuel cel...

Reduction of spent nuclear fuel (SNF) components to metals during the electrolysis of the LiCl-Li2O melt at 650°C is extremely important in the framework of the development of fuel reprocessing technology. Here, ZrO2 reduction by lithium during the electrolysis of the LiCl-Li2O melt at 650°C was studied. Cathode processes on a molybdenum substrate...

Due to its prevalence in nature and its particular properties, silicon is one of the most popular materials in various industries. Currently, metallurgical silicon is obtained by carbothermal reduction of quartz, which is then subjected to hydrochlorination and multiple chlorination in order to obtain solar silicon. This mini-review provides a brie...

Electrolytically produced calcium is one of the most demanded materials in obtaining pure materials. At the same time, the existing technologies and devices for the electrolytic production of calcium were developed in the last century, and at present there are practically no works aimed at optimizing them. However, increasing the capacity and effic...

Electrolytically produced calcium is one of the most demanded materials in obtaining pure materials. At the same time, the existing technologies and devices for the electrolytic production of calcium were developed in the last century, and at present there are practically no works aimed at optimizing them. However, increasing the capacity and effic...

FIELD: metallurgy. SUBSTANCE: invention relates to metallurgy, in particular to the production of zirconium from its oxide by electrolysis of molten salts. The method includes the reduction of ZrO2 to metallic zirconium during the electrolysis of molten salts at a temperature of 650 to 850°C. As the molten salt using a mixture of salts, wt.%: (20-6...

FIELD: silicon production. SUBSTANCE: invention relates to the methods for producing silicon, which is widely used in the electronic and metallurgical industries, and can also be used to create safe lithium-ion chemical current sources. An electrolytic method for obtaining silicon from molten salts, including the electrolysis of a halide melt with...

The possible use of the KCl-K2SiF6 molten system for silicon electrodeposition is considered. The kinetics of silicon electroreduction on glassy carbon in the KCl melt with the addition of 1 and 5 wt% K2SiF6 at 790 °C were studied using electroanalytical methods. It is demonstrated that the appearance of fluoride ions provides the required amount o...

An installation for purifying alkali-metal chlorides, by means of zone recrystallization, for use in the basic operations of the pyrochemical processing of spent fuel from fast reactors is considered. The main technological operations for purifying chlorides at the proposed installation, which contains units for preparation, primary remelting, zone...

Zirconium is one of the most commonly used materials, while the existing methods of its production are multi-stage and energy-intensive. The paper proposes a method for extracting zirconium from its oxide by KF–AlF 3 –Al 2 O 3 –ZrO 2 low-temperature oxide-flu-oride melt electrolysis with a temperature of 750 °C. For this purpose, voltammetric metho...

FIELD: metallurgy. SUBSTANCE: invention relates to the production of nanosized ordered silicon particles by electrolysis of molten salts, which can be used to produce silicon-based anodes when creating new safe lithium-ion batteries with improved energy characteristics. The method includes electrolysis of a KCl melt with a siliconcontaining additiv...

The possibility of silicon electrodeposition from the low-melting LiCl-KCl-CsCl-K 2 SiF 6 electrolytes has been studied. The stability of a silicon-containing additive was studied by cyclic voltammetry, and the rate constant of the chemical reaction of SiF 4 release at a temperature of 827 K was calculated. It is determined that the constants of ve...

An equipment for the purification of alkali metal chlorides via zone recrystallization is made for use in basic operations of pyrochemical reprocessing of spent nuclear fuel of fast reactors. The main technological operations for the purification of chlorides on the equipment are described, which contains devices for preparation, primary melting, z...

Content Chapter 1. Measurement of electrode potentials in the KF-(NaF)-AlF3-Al2O3 melts Chapter 2. Anode processes during the electrolysis of the KF-AlF3-Al2O3 based melts Chapter 3. Cathode processes during the electrolysis of the KF-AlF3-Al2O3 based melts Chapter 4. Physico-chemical foundations of producing aluminum master alloys in the KF-AlF3-A...

FIELD: metallurgy. SUBSTANCE: invention relates to the metallurgy of semiconductor materials, in particular, to the electrolytic production ofsilicon from molten salts. The method includes electrolysis of molten halide electrolyte, which is a mixture of salts of 10-60 KCl wt.% and 40-90 CsCl with the addition of up to 50 wt.% K2SiF6. Electrolysisis...

Currently, silicon and silicon-based composite materials are widely used in microelectronics and solar energy devices. At the same time, silicon in the form of nanoscale fibers and various particles morphology is required for lithium-ion batteries with increased capacity. In this work, we studied the electrolytic production of nanosized silicon fro...

FIELD: battery production. SUBSTANCE: invention relates to materials of lithium-ion batteries with high specific energy. An elementary unit of a battery consists of current collectors, an anode, a cathode, an electrolyte and an insulator. Thin–film electrolytes are used as electrolytes, lithium-cation-conducting materials are used as cathodes. A mu...

In prior works, a novel method for continuously obtaining Al-Zr master alloys from oxide raw materials by electrolysis of a low-melting electrolyte based on the KF-NaF-AlF3-ZrO2 system at 800 °C to 820 °C was proposed. In the present work, the method for preparing the Al-Zr master alloy proceeded in an enlarged 100 A electrolyzer and the obtained m...

FIELD: chemical industry. SUBSTANCE: invention relates to the electrolytic production of silicon, which can be used in clean and relatively safe small-scale energy industries, for example, in lithium-ion batteries with anodes based on silicon nano-composite structures and solar cells, which have improved performance characteristics. The method incl...

FIELD: chemical industry. SUBSTANCE: invention makes it possible to determine the rate of dissolution of the oxide in the oxide-halide melt. The essence of the invention is that a portion of oxide is loaded into an oxide-halide melt placed in a crucible that is chemically stable with respect to the components of the melt at the measurement temperat...

FIELD: aluminum production. SUBSTANCE: invention relates to a method and an electrochemical device for determining the content of alumina in cryolite-alumina melt during the electrolytic production of aluminum. The method includes immersing an electrochemical device in a cryolite-alumina melt, polarization using a current source of the electrochemi...

The results of several different tests related to the low-temperature aluminum electrolysis were considered in this work. The role of mass transfer processes in the anode-cathode space was recommended to be significant during electrolysis in the low-temperature KF-AlF3 and NaF-AlF3-based melts. The stationary polarization and voltammetry methods we...

A brief overview of modern industrial and experimental methods for the synthesis of aluminozirconium ligatures is performed. The basic regularities of the proceeding processes, and also properties of the obtained ligatures are considered, technical and economic indicators and prospects of development of the considered technologies are estimated. Th...

Reduction of ZrO 2 by lithium during electrolysis of LiCl-KCl-Li 2 O melt at 650 °C was studied using a set of physicochemical methods of analysis. Influence of ZrO 2 in the space near a molybdenum cathode on the kinetics of the cathode process was established. Possible variations of the electrode reaction associated with the zirconium reduction we...

KF-AlF3-Al2O3-based melts are promising media for the electrolytic production of aluminum in next-generation energy efficient cells. This work analyzes the dissolution of Al2O3 in the KF-AlF3 melt with a mole ratio [KF]/[AlF3 ] = 1.5 mol/mol at 785°C using cyclic voltammetry and the carbothermic reduction of melt samples using a LECO analyzer. The...

New methods of liquid metals refining and separation operated with low energy consumption and environmental impact are highly desirable nowadays. This work presents an approach of Al refining and extraction from scrap in a thin layer of the multiple-pore molten salt electrochemical system, which appears promising. The new single-capillary cell desi...

В рамках модели стационарного процесса вторичного восстановления ионов тугоплавкого металла щелочным металлом (или щелочноземельным), образующимся на гладком катоде в ходе электролиза солевого расплава, проведено численное воспроизведение натурного эксперимента. Модельные расчеты сделаны на основе поляризации, измеренной при катодном восстановлении...

The behavior of potential ceramic materials (electrolytes conducting on oxygen ions) of electrochemical control devices of technological operations in oxide-halide melts was investigated. Based on the literature data and thermodynamic estimates for long-term tests in the LiCl, LiCl-Li 2 O and LiCl-Li 2 O-Li melts at a temperature of 650 ° C, mixtur...

To date, lithium-ion batteries have become one of the most important energy storage devices. Creating lithium ion microbatteries using materials structured at the nanoscale allow you to create solid-state lithium-ion batteries that have the fastest electrodes. In this work, we propose the design of an element of a lithium-ion current source, which...

Alumina content in electrolysis cells for aluminum production is one of the most important and poorly controlled parameters. The alumina is delivered to the cell by means of an alumina automatic feeding system, adjusted to the amperage or to the voltage alteration. However, a change in the alumina content in the cryolite-alumina melt depends not on...

Al-Mg alloys and composite materials based on Al-Mg alloys are widely used in various fields due to their unique characteristics. In this paper, compositions of salt fluxes for processing alloys, as well as for the synthesis of Al-Mg-based composites, are thermodynamically justified and experimentally tested. The NaCl-KCl (chloride-fluoride flux) w...

FIELD: physics. SUBSTANCE: invention relates to a method of separating spent nitride nuclear fuel from shell of fuel element fragments and can be used in technology of processing spent nitride nuclear fuel as part of closed nuclear fuel cycle technology. Fragments of fuel elements together with shell are heated to temperature of not less than 500 °...

FIELD: physics. SUBSTANCE: invention relates to nuclear power engineering, in particular to methods of processing spent nuclear fuel, and can be used in technology of processing spent nuclear fuel in closed nuclear fuel cycle circuit, extracted from fuel elements. Method of processing spent nitride nuclear fuel in salt melt includes its chlorinatio...

The alumina dissolution in a cryolite-alumina melt was studied by voltammetry using a new design of the electrochemical sensor. It consisted of a working carbon electrode, shielded with a pyrolytic boron nitride tube, and the counter electrode, forming an alloy with aluminum, with a developed surface. The difference of such electrochemical measurin...

The acceleration method of nuclear reactions is used to measure the content of lithium and oxygen in zirconium oxides. The purpose of the study stems from the fact that there are no direct methods for determining lithium concentration in solids, while lithium is currently widely used for alloying alloys in aircraft construction, nuclear power engin...

FIELD: nuclear energy. SUBSTANCE: invention relates to nuclear power engineering, particularly, to processing spent nitride nuclear fuel and can be used mainly in closed nuclear fuel cycle (CNFC). Method involves conversion of nitride fuel components into chlorides at temperature of not higher than 750 °C by chemical dissolving in molten chloride L...

A review of the existing methods for producing aluminum master alloys with silicon, zirconium, scandium and boron are given. Basic parameters, advantages and disadvantages of the existing methods are analyzed, indicating the need to develop new more energy-efficient technologies. The prospects of obtaining aluminum master alloys in the electrolysis...