Study on Li-Mg co-deposition mechanism in LiCl-KCl-MgCl<sub>2</sub> melt

ZHANG Yuanjing; LIU Zhaoting; ZHU Shigui; LU Guimin

doi:10.13264/j.cnki.ysjskx.2023.03.003

Volume 14 Issue 3

Jun. 2023

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Nonferrous Metals Science and Engineering > 2023 > 14(3): 311-317. > DOI: 10.13264/j.cnki.ysjskx.2023.03.003

ZHANG Yuanjing, LIU Zhaoting, ZHU Shigui, LU Guimin. Study on Li-Mg co-deposition mechanism in LiCl-KCl-MgCl₂ melt[J]. Nonferrous Metals Science and Engineering, 2023, 14(3): 311-317. DOI: 10.13264/j.cnki.ysjskx.2023.03.003

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Study on Li-Mg co-deposition mechanism in LiCl-KCl-MgCl₂ melt

ZHANG Yuanjing^{1, 2},
LIU Zhaoting^{1, 2},
ZHU Shigui³,
LU Guimin^{1, 2, ,}

1.
National Engineering Research Center for Integrated Utilization of Salt Lake Resources, East China University of Science and Technology, Shanghai 200237, China
2.
Joint International Laboratory for Potassium and Lithium Strategic Resources, Shanghai 200237, China
3.
Fengxin Ganfeng Lithium Industry Co., Ltd., Yichun 336000, Jiangxi, China

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Received Date: May 25, 2022
Revised Date: June 13, 2022
Available Online: June 30, 2023

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Abstract

Abstract

Li-Mg alloys, as cathode materials for lithium batteries, have broad application prospects in the field of new energy, and the preparation of Li-Mg alloys by molten salt electrolysis has great advantages. The electrochemical behavior of Mg²⁺ on a tungsten electrode in LiCl-KCl-MgCl₂ melt and the Li-Mg co-deposition process were studied by a three-electrode system, respectively. The effect of MgCl₂ concentration on electrolytic co-deposition of Li-Mg was also investigated. The experimental results of square wave voltammetry and timing current method show that the one-step two electrons reduction of Mg²⁺ to metallic Mg on the tungsten electrode is an instantaneous nucleation process, which is not affected by temperature. The results of the timing potentiometric experiment show that with the increasing concentration of MgCl₂, the cathodic current density required for the electrolytic co-deposition of Li-Mg from LiCl-KCl-MgCl₂ melt is gradually increased. When the MgCl₂ concentration in the LiCl-KCl-MgCl₂ melt is 5%, the minimum cathodic current density to achieve Li-Mg co-deposition is 0.287 A/cm². The galvanostatic electrolysis results show that when the MgCl₂ concentration is less than or equal to 5%, the metal Mg content in the Li-Mg product increases with MgCl₂ concentration in the melt. When the MgCl₂ concentration reaches 10%, electrolysis only obtains metal Mg.
- molten salt electrolysis,
- Li-Mg co-deposition,
- electrochemical,
- MgCl₂ concentration

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