Electrodeposition of Silicon Fibers from KI–KF–KCl–K<sub>2</sub>SiF<sub>6</sub> Melt and Their Electrochemical Performance during Lithiation/Delithiation
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–K<sub>2</sub>SiF<sub>6</sub> melt at 72...
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MDPI AG
2024-03-01
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| author | Anastasia Leonova Natalia Leonova Lyudmila Minchenko Andrey Suzdaltsev |
| author_facet | Anastasia Leonova Natalia Leonova Lyudmila Minchenko Andrey Suzdaltsev |
| author_sort | Anastasia Leonova |
| collection | DOAJ |
| description | 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–K<sub>2</sub>SiF<sub>6</sub> melt at 720 °C. For this purpose, the parameters of silicon electrodeposition in the form of fibers were determined using cyclic voltammetry, and experimental samples of ordered silicon fibers with an average diameter from 0.1 to 0.3 μm were obtained under galvanostatic electrolysis conditions. Using the obtained silicon fibers, anode half-cells of a lithium-ion battery were fabricated, and its electrochemical performance under multiple lithiations and delithiations was studied. By means of voltametric studies, it is observed that charging and discharging the anode based on the obtained silicon fibers occurs at potentials from 0.2 to 0.05 V and from 0.2 to 0.5 V, respectively. A change in discharge capacity from 520 to 200 mAh g<sup>−1</sup> during the first 50 charge/discharge cycles at a charge current of 0.1 C and a Coulombic efficiency of 98–100% was shown. The possibility of charging silicon-based anode samples at charging currents up to 2 C was also noted; the discharge capacity ranged from 25 to 250 mAh g<sup>−1</sup>. |
| first_indexed | 2024-04-24T18:22:55Z |
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| issn | 2673-3293 |
| language | English |
| last_indexed | 2024-04-24T18:22:55Z |
| publishDate | 2024-03-01 |
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| series | Electrochem |
| spelling | doaj.art-e995fe09597e488896d07494d12137852024-03-27T13:34:42ZengMDPI AGElectrochem2673-32932024-03-015112413210.3390/electrochem5010008Electrodeposition of Silicon Fibers from KI–KF–KCl–K<sub>2</sub>SiF<sub>6</sub> Melt and Their Electrochemical Performance during Lithiation/DelithiationAnastasia Leonova0Natalia Leonova1Lyudmila Minchenko2Andrey Suzdaltsev3Scientific Laboratory of Electrochemical Devices and Materials, Ural Federal University, Mira St. 19, 620075 Ekaterinburg, RussiaScientific Laboratory of Electrochemical Devices and Materials, Ural Federal University, Mira St. 19, 620075 Ekaterinburg, RussiaInstitute of High Temperature Electrochemistry UB RAS, Academicheskaya St. 20, 620066 Ekaterinburg, RussiaScientific Laboratory of Electrochemical Devices and Materials, Ural Federal University, Mira St. 19, 620075 Ekaterinburg, RussiaThe 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–K<sub>2</sub>SiF<sub>6</sub> melt at 720 °C. For this purpose, the parameters of silicon electrodeposition in the form of fibers were determined using cyclic voltammetry, and experimental samples of ordered silicon fibers with an average diameter from 0.1 to 0.3 μm were obtained under galvanostatic electrolysis conditions. Using the obtained silicon fibers, anode half-cells of a lithium-ion battery were fabricated, and its electrochemical performance under multiple lithiations and delithiations was studied. By means of voltametric studies, it is observed that charging and discharging the anode based on the obtained silicon fibers occurs at potentials from 0.2 to 0.05 V and from 0.2 to 0.5 V, respectively. A change in discharge capacity from 520 to 200 mAh g<sup>−1</sup> during the first 50 charge/discharge cycles at a charge current of 0.1 C and a Coulombic efficiency of 98–100% was shown. The possibility of charging silicon-based anode samples at charging currents up to 2 C was also noted; the discharge capacity ranged from 25 to 250 mAh g<sup>−1</sup>.https://www.mdpi.com/2673-3293/5/1/8siliconelectrodepositionfibersSi-anodelithium-ion batteryelectrochemical performance |
| spellingShingle | Anastasia Leonova Natalia Leonova Lyudmila Minchenko Andrey Suzdaltsev Electrodeposition of Silicon Fibers from KI–KF–KCl–K<sub>2</sub>SiF<sub>6</sub> Melt and Their Electrochemical Performance during Lithiation/Delithiation Electrochem silicon electrodeposition fibers Si-anode lithium-ion battery electrochemical performance |
| title | Electrodeposition of Silicon Fibers from KI–KF–KCl–K<sub>2</sub>SiF<sub>6</sub> Melt and Their Electrochemical Performance during Lithiation/Delithiation |
| title_full | Electrodeposition of Silicon Fibers from KI–KF–KCl–K<sub>2</sub>SiF<sub>6</sub> Melt and Their Electrochemical Performance during Lithiation/Delithiation |
| title_fullStr | Electrodeposition of Silicon Fibers from KI–KF–KCl–K<sub>2</sub>SiF<sub>6</sub> Melt and Their Electrochemical Performance during Lithiation/Delithiation |
| title_full_unstemmed | Electrodeposition of Silicon Fibers from KI–KF–KCl–K<sub>2</sub>SiF<sub>6</sub> Melt and Their Electrochemical Performance during Lithiation/Delithiation |
| title_short | Electrodeposition of Silicon Fibers from KI–KF–KCl–K<sub>2</sub>SiF<sub>6</sub> Melt and Their Electrochemical Performance during Lithiation/Delithiation |
| title_sort | electrodeposition of silicon fibers from ki kf kcl k sub 2 sub sif sub 6 sub melt and their electrochemical performance during lithiation delithiation |
| topic | silicon electrodeposition fibers Si-anode lithium-ion battery electrochemical performance |
| url | https://www.mdpi.com/2673-3293/5/1/8 |
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