Electrodeposition of Silicon from the KCl–CsCl–K2SiF6 Melt

Gevel, Timofey; Zhuk, Sergey I.; Leonova, Natalia M.; Leonova, Anastasia M.; Suzdaltsev, Andrey; Zaikov, Yu. P.

doi:10.1134/s0036029522080237

Cited by 10 publications

(4 citation statements)

References 22 publications

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“…We carried out a series of experiments on silicon electrodeposition from low-fluoride systems based on mixtures of KCl, CsCl, and LiCl with additions of K2SiF6 and SiO2 in the temperature range 350 to 790 °С [32][33][34][35][36]. Due to the possibility of deep purification of chlorides by zone recrystallization [37], the proposed systems are suitable for use to obtain high-purity silicon.…”

Section: Results Of the Silicon Electrodepositionmentioning

confidence: 99%

“…As a result of the electrolysis of KCl-K2SiF6, KCl-K2SiF6-SiO2, KCl-CsCl-K2SiF6, and LiCl-KCl-CsCl-K2SiF6 melts, we obtained silicon deposits of various morphologies by varying the electrolysis parameters [32][33][34][35][36]. In particular, at a cathode current density of 20 to 150 mA cm −2 , silicon fibers (diameter 100-700 nm), tubes, and needles (diameter 100-400 nm) were obtained, the specific capacity of which after 15 cycles varied from 200 to 850 mAh g −1 .…”

Section: Electrolytic Silicon For Lithium-ion Current Sourcesmentioning

confidence: 99%

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Silicon Electrodeposition for Microelectronics and Distributed Energy: A Mini-Review

Suzdaltsev

2022

Electrochem

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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 brief analysis of alternative methods for obtaining silicon by electrolysis of molten salts. The review covers factors determining the choice of composition of molten salts, typical silicon precipitates obtained by electrolysis of molten salts, assessment of the possibility of using electrolytic silicon in microelectronics, representative test results for the use of electrolytic silicon in the composition of lithium-ion current sources, and representative test results for the use of electrolytic silicon for solar energy conversion. This paper concludes by noting the tasks that need to be solved for the practical implementation of methods for the electrolytic production of silicon, for the development of new devices and materials for energy distribution and microelectronic application.

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Section: Results Of the Silicon Electrodepositionmentioning

confidence: 99%

Section: Electrolytic Silicon For Lithium-ion Current Sourcesmentioning

confidence: 99%

Silicon Electrodeposition for Microelectronics and Distributed Energy: A Mini-Review

Suzdaltsev

2022

Electrochem

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“…Adding CsCl to molten KCl-containing K 2 SiF 6 can reduce the liquidus temperature of the melt and the diameter of Si nanowires. The decrease in cathodic current density would increase the diameter of Si nanowires (Gevel et al, 2022a). In KCl-K 2 SiF 6 melts, the Si(IV) reduction process comprises a reversible 4-electron process, Si nanofibers with a diameter of 200 to 300 nm and a purity of 99.99% can be deposited (Gevel et al, 2022b).…”

Section: Chloride-based Electrolytesmentioning

confidence: 99%

Silicon electrowinning by molten salts electrolysis

Padamata

Sævarsdóttir

2023

Front. Chem.

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Electrochemically produced Si in molten salts can be used to fabricate electronic and photovoltaic devices. The major factors influencing the structure and morphology of Si deposits are electrolyte composition, applied current densities and overpotentials, type of precursors, operating temperature, and electrodeposition duration. For Si electrodeposition, a less corrosive electrolyte with the ability to dissolve Si species and easily soluble in water should be used. This review provides a brief analysis of the Si production by electrolysis in molten salts.

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“…Silicon materials to be used in devices for solar energy conversion, accumulation and storage are being actively developed [2][3][4]. Silicon is a promising anode material for lithium-ion power sources because its specific lithium-adsorption capacity (4200 mAh•g -1 ) is by an order of magnitude higher than those of graphite-containing anode materials (372 mAh•g -1 ) [5][6][7]. However, high silicon anode lithium-adsorption capacity implies a significant volume expansion (up to 300%) that may result either in destruction of the power source or in the contact fault between the anode material and the substrate (current collector).…”

Section: Introductionmentioning

confidence: 99%

Electroreduction of silicon from the NaI–KI–K₂SiF₆ melt for lithium-ion power sources

Abdurakhimova¹,

Laptev²,

Leonova³

et al. 2022

Chim.Tech.Acta

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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 cells. In the present paper a possibility of silicon electroreduction from the NaI–KI–K2SiF6 melt in the argon atmosphere is studied. With this aim in view the electrolysis of the NaI–KI–K2SiF6 melt with glassy carbon cathode was performed under galvanostatic and potentiostatic regimes at the temperatures ranging from 650 to 750 °С. The morphology, phase and elemental analyses of the obtained silicon deposits were performed after their separation from the electrolytes by the ICP, SEM-EDX, XRD and Raman spectroscopy methods. Fiber and thread-like silicon samples of 60 to 320 nm in dimeter with admixtures concentrations (mainly oxygen) from 1.2 to 4.6 wt.% were experimentally synthesized. The obtained samples were tested as possible Si/C composite anodes for lithium-ion power sources. The discharge capacity of such power sources after 30 cycles of lithiation-delithiation ranged from 440 to 565 mAh·g–1 and the coloumbic efficiency ranged from 89 to 91%.

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Electrodeposition of Silicon from the KCl–CsCl–K2SiF6 Melt

Cited by 10 publications

References 22 publications

Silicon Electrodeposition for Microelectronics and Distributed Energy: A Mini-Review

Silicon Electrodeposition for Microelectronics and Distributed Energy: A Mini-Review

Silicon electrowinning by molten salts electrolysis

Electroreduction of silicon from the NaI–KI–K₂SiF₆ melt for lithium-ion power sources

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Electrodeposition of Silicon from the KCl–CsCl–K2SiF6 Melt

Cited by 10 publications

References 22 publications

Silicon Electrodeposition for Microelectronics and Distributed Energy: A Mini-Review

Silicon Electrodeposition for Microelectronics and Distributed Energy: A Mini-Review

Silicon electrowinning by molten salts electrolysis

Electroreduction of silicon from the NaI–KI–K2SiF6 melt for lithium-ion power sources

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Product

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Electroreduction of silicon from the NaI–KI–K₂SiF₆ melt for lithium-ion power sources