The Paton Welding Journal, 2022, №10



2022 №10 (07)

DOI of Article 10.37434/tpwj2022.10.08

2022 №10 (01)

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The Paton Welding Journal, 2022, #10, 49-56 pages

Plasmo-chemical process of obtaining nanosilicon for lithium-ion batteries

S.V. Petrov¹, S.G. Bondarenko², Sato Koichi³

¹The Gas Institute of the National Academy of Sciences of Ukraine 39, Degtyarivska str., Kyiv, Ukraine, 03113. E-mail: svp_plazer@i.ua
²National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute». 37, Pobedy ave., Kyiv, Ukraine, 03056. E-mail: s_g_bondarenko@ukr.net
³Kankyo Techno Co. LTD Japan. 959-2633 Niigata pref. Tainai city Sekizawa 69-5. E-mail: bz659804@bz04.plala.or.jp

Abstract
The process of complete plasma evaporation of the initial solid material for the synthesis of Si — nanoparticles as applied to lithium-ion batteries and energy storage devices was studied in this work. The use of numerical modeling methods made it possible to determine the flow parameters of a two-phase high-temperature flow - temperature fields, velocities and concentrations. To study the processes of evaporation and subsequent synthesis of nanopowders, a plasma reactor with an electric arc plasmatron with a linear circuit and using an argon-hydrogen mixture as a plasma-forming gas was developed. The influence of the external magnetic field on control of the plasma jet parameters was studied in a series of experiments using an electric arc plasmatron in plasma laboratory installations of 30 and 150 kW power. The influence of the magnetic field on the configuration, geometric dimensions and structure of the initial section of the plasma jet was determined. The initial dispersed material — silicon powder was fed to the section of the plasmatron nozzle in a radial pattern. Experimental confirmation of the phenomenon of elongation of the high-temperature initial section of the plasma jet in an axial magnetic field was obtained. It was experimentally established that the creation of a peripheral gas curtain significantly improves the characteristics of heat and mass transfer in the reactor. The influence of two-phase flow, heat exchange and mass flow of nanoparticles, including on the surface of a plasma reactor with a limited jet flow, in the processes of obtaining silicon nanopowders was studied. The obtained regularities can be used to develop and put into operation a pilot plant for high-performance production of nanosilicon powders. Ref. 12, Fig. 10.
Keywords: plasma-chemical synthesis; arc reactor; plasma jet; nanosilicon; lithium-ion battery; numerical modeling

Received: 11.07.2022
Accepted: 01.12.2022

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