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Title: Electrochemical Synthesis of Nano-sized Silicon from KCI–K2SiF6 Melts for Powerful Lithium-Ion Batteries
Authors: Gevel, T.
Zhuk, S.
Leonova, N.
Leonova, A.
Trofimov, A.
Suzdaltsev, A.
Zaikov, Y.
Issue Date: 2021
Publisher: MDPI
Citation: Electrochemical Synthesis of Nano-sized Silicon from KCI–K2SiF6 Melts for Powerful Lithium-Ion Batteries / T. Gevel, S. Zhuk, N. Leonova et al. // Applied Sciences (Switzerland). — 2021. — Vol. 11. — Iss. 22. — 10927.
Abstract: 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 . © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85119852707
PURE ID: 29068487
ISSN: 2076-3417
metadata.dc.description.sponsorship: This research received no external funding. This work is performed in the frame of the State Assignment number 075-032020-582/1, dated 18 February 2020 (the theme number 0836-2020-0037).
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