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| Effects of Impurities on Electrolysis Process of Lithium Metal |
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Received:May 21, 2020
Revised:May 25, 2020
Accepted:May 26, 2020
Published Online:July 17, 2020
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| DOI：doi：10.3969/j.issn.1007-7545.2020.08.008 |
| KeyWord:lithium; electrolysis; impurities |
| Author | Institution |
| Li Quan |
中国科学院青海盐湖研究所 |
| Wang Shi-dong |
中国科学院青海盐湖研究所 |
| Huo Yan |
中国科学院青海盐湖研究所 |
| Li Ming-zhen |
中国科学院青海盐湖研究所 |
| Ye Xiu-shen |
中国科学院青海盐湖研究所 |
| Pang Quan-shi |
青海金昆仑锂业有限公司 |
| Wu Zhi-jian |
中国科学院青海盐湖研究所 |
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| Abstract: |
| Effects of impurities of NaCl, CaCl2, MgCl2, FeCl3 and Li2SO4 in electrolysis process were studied at 420 ℃ with 50%KCl-50%LiCl as molten salt electrolyte system. The results show that deposition of sodium, magnesium and calcium is precipitated prior to lithium and entered into lithium metal cathode products, causing poor aggregation of lithium metal and reducing current efficiency and lithium yield. Impurity FeCl3 is preferentially reduced to sponge iron resulting in cathode passivation then affects electrolysis process. Li2SO4 reacts with lithium metal by oxidation and reduction, consuming lithium metal to produce Li2O and Li2S, and reducing current efficiency and lithium yield. |
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