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| Study on Mechanism of Influence of Cell Voltage on Electrochemical Reduction of SiO2 in CaCl2-NaCl Molten Salt |
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Received:November 17, 2019
Revised:November 19, 2019
Accepted:November 20, 2019
Published Online:April 18, 2020
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| DOI：doi：10.3969/j.issn.1007-7545.2020.05.008 |
| KeyWord:silicon; cell voltage; microstructure; molten salt electrolysis |
| Author | Institution |
| ZHANG Ying-jie |
昆明理工大学 冶金与能源工程学院 |
| ZHOU Zhong-ren |
昆明理工大学 冶金与能源工程学院;锂离子电池及材料国家地方联合工程实验室 |
| HUA Yi-xin |
昆明理工大学 冶金与能源工程学院 |
| DONG Peng |
昆明理工大学 冶金与能源工程学院 |
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| Abstract: |
| Nanosized metallic silicon was prepared via molten salt electrolysis of SiO2. Effects of cell voltage on electrochemical reduction of SiO2 and microstructure of metallic silicon were investigated. The results suggest that higher cell voltage is in favor of electrochemical reduction of SiO2 with cell voltage varying from 1.7 V to 2.0 V. As cell voltage is operated under 1.8-2.0 V, SiO2 can be thoroughly electrolyzed to form metallic Si. Micro-structure of electro-produced Si is nanowire in the width of around 40 nm when cell voltage is 1.8 V. As cell voltage rises to 1.9 V, microstructure of silicon contains nanowire in the width of around 50 nm and nanosized particles with size of around 100 nm. As cell voltage is controlled at 2.0 V, microstructure of silicon is converted to accumulation of nanoparticles with size of 100-300 nm. |
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