Synthesis of Silumins in KF-AlF<sub>3</sub>-SiO<sub>2</sub>Melts

Pershin, P. S.; Suzdaltsev, Andrey; Zaikov, Yu. P.

doi:10.1149/2.0521605jes

Cited by 18 publications

(16 citation statements)

References 17 publications

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“…Those waves can be associated with the discharge of different oxy containing electroactive Si-O-Cl-F anions, which appear in the melt during dissolution [50,51]. A similar effect was observed in the works, aimed a electroreduction of silicon and other elements from halide-oxide melts [52][53][54]. In the K2SiF6-SiO2 melt, an increase of the silicon electroreduction current was observed, the silicon content has been increased.…”

Section: Effect Of Sio2 On the Kinetics Of Silicon Electrodepositionsupporting

confidence: 69%

Electrochemical Synthesis of Nano-Sized Silicon from KCl–K2SiF6 Melts for Powerful Lithium-Ion Batteries

et al. 2021

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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 from low-fluoride KCl–K2SiF6 and KCl–K2SiF6–SiO2 melts. The effect of SiO2 addition on the morphology and composition of electrolytic silicon deposits was studied under the conditions of potentiostatic electrolysis (cathode overvoltage of 0.1, 0.15, and 0.25 V vs. the potential of a quasi-reference electrode). The obtained silicon deposits were separated from the electrolyte residues, analyzed by scanning electron microscopy and spectral analysis, and then used to fabricate a composite Si/C anode for a lithium-ion battery. The energy characteristics of the manufactured anode half-cells were measured by the galvanostatic cycling method. Cycling revealed better capacity retention and higher coulombic efficiency of the Si/C composite based on silicon synthesized from KCl–K2SiF6–SiO2 melt. After 15 cycles at 200 mA·g−1, material obtained at 0.15 V overvoltage demonstrates capacity of 850 mAh·g−1.

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Section: Effect Of Sio2 On the Kinetics Of Silicon Electrodepositionsupporting

confidence: 69%

Electrochemical Synthesis of Nano-Sized Silicon from KCl–K2SiF6 Melts for Powerful Lithium-Ion Batteries

et al. 2021

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“…[18][19][20] The results of the study supplement scarce data on the kinetics of aluminum electrowinning from KF-AlF 3 -Al 2 O 3 melts and suspensions. [21][22][23]…”

mentioning

confidence: 99%

Cathode Process at the Electrolysis of KF-AlF₃-Al₂O₃Melts and Suspensions

Nikolaev

Suzdaltsev

Polyakov

et al. 2017

J. Electrochem. Soc.

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The kinetics of the cathode process on tungsten in KF-AlF 3-Al 2 O 3 melts and suspensions was studied by means of voltammetry and galvanostatic polarization. The effects of the temperature, [KF]/[AlF 3 ] ratio, Al 2 O 3 content on the kinetic parameters of electrowinning of aluminum from the KF-AlF 3-Al 2 O 3 melts and suspensions were determined. Introducing Al 2 O 3 slurry into the suspension and increasing its proportion make the diffusion of the electroactive ions to the cathode more difficult. The parameters for the suspension electrolysis were chosen on the basis of electrochemical measurements. The possibility of aluminum production during the electrolysis of KF-AlF 3-Al 2 O 3 suspension with 45 wt% Al 2 O 3 in the solid phase was demonstrated.

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“…The aluminium reduction takes place closer to the potential of -0.2 V with the cathode limiting current density (il) ranging in between 0.45 and 0.5 A.cm -2 depending on the [KF/AlF3] ratio and Al2O3 wt.%. The potential at high ic (between -0.7 and -1.1 V) did not vary much which is associated to the potassium reduction on the cathode and the deposition of the K3AlF6 and KAlF4 salts mixture [49].…”

Section: Stationary Polarizationmentioning

confidence: 89%