Electrochemical formation of Mg–Li alloys at solid magnesium electrode from LiCl–KCl melts

Yan, Yong De; Zhang, Mi Lin; Han, Wei; Cao, Dianxue; Yuan, Yue; Xue, Yun

doi:10.1016/j.electacta.2007.11.043

Cited by 36 publications

(21 citation statements)

References 15 publications

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“…Therefore, electrochemical methods for the preparation of magnesium base alloys are drawing increased attention. In our previous study, we have successfully prepared Mg-Li alloys on a magnesium cathode from the LiCl-KCl melts and investigated the electrochemical formation process and phase control of Mg-Li alloys at 693-783 K [6,7]. However, in these methods, remaining some shortcomings include a long process time and high energy consumption.…”

Section: Introductionmentioning

confidence: 98%

Study on the preparation of Mg–Li–Mn alloys by electrochemical codeposition from LiCl–KCl–MgCl2–MnCl2 molten salt

Zhang

Chen

et al. 2010

J Appl Electrochem

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This study presents a novel electrochemical study on the codeposition of Mg, Li, and Mn on a molybdenum electrode in LiCl-KCl-MgCl 2 -MnCl 2 melts at 893 K to form different phases Mg-Li-Mn alloys. Transient electrochemical techniques such as cyclic voltammetry, chronopotentiometry, and chronoamperometry have been used in order to investigate the codeposition behavior of Mg, Li, and Mn ions. The results obtained show that the potential of Li metal deposition, after the addition of MgCl 2 and MnCl 2 , is more positive than the one of Li metal deposition before the addition. The codeposition of Mg, Li, and Mn occurs at current densities lower than -1.43 A cm -2 in LiCl-KCl-MgCl 2 (8 wt%) melts containing 2 wt% MnCl 2 . The onset potential for the codeposition of Mg, Li, and Mn is -2.100 V. a, a ? b, and b phases Mg-Li-Mn alloys with different lithium and manganese contents were obtained via galvanostatic electrolysis from LiCl-KCl melts with different concentrations of MgCl 2 and MnCl 2 . The microstructures of typical a and b phases of Mg-Li-Mn alloys were characterized by X-ray diffraction (XRD), optical microscopy (OM), and scanning electron microscopy (SEM). The analysis of energy dispersive spectrometry (EDS) and EPMA area analysis showed that the elements of Mg and Mn distribute homogeneously in the Mg-Li-Mn alloys. The results of inductively coupled plasma analysis determined that the chemical compositions of Mg-Li-Mn alloys correspond with the phase structures of XRD patterns, and lithium and manganese contents of Mg-Li-Mn alloys depend on the concentrations of MgCl 2 and MnCl 2 .

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Section: Introductionmentioning

confidence: 98%

Study on the preparation of Mg–Li–Mn alloys by electrochemical codeposition from LiCl–KCl–MgCl2–MnCl2 molten salt

Zhang

Chen

et al. 2010

J Appl Electrochem

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“…This electrolyte had more lithium chloride than the eutectic composition of the lithium chloridepotassium chloride system, [10,16] to keep the composition close to the eutectic lithium chloride-potassium chloride for a long time despite the consumption of lithium chloride during electrolysis. In the literature, [8][9][10][11][12][13] the electrolyses of lithium depositing onto magnesium alloy cathodes in molten salt were carried in the temperature range of 693 to 903 K. In order to allow the gas to escape quickly from the electrolyte, the temperature should be kept at 30 to 50 K higher than the melting point of the electrolyte to keep the melt in good fluidity and low surface tension. Since low temperature is favorable to reduce energy consumption, all electrolyses in the present work were carried out at a relatively low temperature of 693 K.…”

Section: Methodsmentioning

confidence: 99%

“…[14] However, the diffusing and alloying steps were still regarded as the controlling step because of the difficulty of diffusion in solid materials. [14] In previous works, [8][9][10][11][12][13] the depth of penetration, which was also named the width of a single lithium containing layer, was less than 2 mm. Since high temperature leads to high diffusion of the lithium atoms, the lithium penetration depth can be improved by increasing the temperature.…”

Section: Introductionmentioning

confidence: 99%

“…[8,9] This kind of method allows the lithium atoms from lithium chloride to alloy with other metals directly, as a result, eliminating preparation of the highly reactive lithium. During the last 5 years, researchers studied the methods of preparing magnesium-lithium alloys by electrolysis at relatively low temperatures of 693 to 783 K, [10][11][12][13] because electrolysis at low temperature will reduce the corrosion of containers and lower the energy consumption. In the electrolytic method, the processes of producing alloys can be divided into two steps.…”

Section: Introductionmentioning

confidence: 99%

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Electrolytic Deposition and Diffusion of Lithium onto Magnesium-9 Wt Pct Yttrium Bulk Alloy in Low-Temperature Molten Salt of Lithium Chloride and Potassium Chloride

Dong

Wang

2009

Metall Mater Trans B

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The electrolytic deposition and diffusion of lithium onto bulk magnesium-9 wt pct yttrium alloy cathode in molten salt of 47 wt pct lithium chloride and 53 wt pct potassium chloride at 693 K were investigated. Results show that magnesium-yttrium-lithium ternary alloys are formed on the surface of the cathodes, and a penetration depth of 642 lm is acquired after 2 hours of electrolysis at the cathodic current density of 0.06 AAEcm À2 . The diffusion of lithium results in a great amount of precipitates in the lithium containing layer. These precipitates are the compound of Mg 41 Y 5 , which arrange along the grain boundaries and hinder the diffusion of lithium, and solid solution of yttrium in magnesium. The grain boundaries and the twins of the magnesium-9 wt pct yttrium substrate also have negative effects on the diffusion of lithium.

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“…Therefore, electrochemical methods for the preparation of magnesium base alloys are drawing increased attention. In our previous work, we successfully prepared Mg-Li alloys on a magnesium cathode from LiCl-KCl melts, and investigated the electrochemical formation process and phase control of Mg-Li alloys at 693-783 K [9,10]. Lin et al [11] studied a method of preparing a Mg-Li-Al-Zn alloy on a Mg-AlZn cathode by electrodeposition and diffusion of the lithium atoms.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical study of the codeposition of Mg–Li–Al alloys from LiCl–KCl–MgCl2–AlCl3 melts

et al. 2008

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This work presents a novel electrochemical study on the codeposition of Mg, Li and Al on a molybdenum electrode in LiCl-KCl-MgCl 2 -AlCl 3 melts at 943 K to form Mg-Li-Al alloys. Cyclic voltammograms (CVs) showed that the underpotential deposition (UPD) of magnesium on pre-deposited aluminum leads to the formation of a liquid Mg-Al solution, and the succeeding underpotential deposition of lithium on pre-deposited MgAl leads to the formation of a liquid Mg-Li-Al solution. Chronopotentiometric measurements indicated that the codeposition of Mg, Li and Al occurs at current densities lower than -0.47 A cm -2 in LiCl-KCl-MgCl 2 (0.525 mol kg -1 ) melts containing 0.075 mol kg -1 AlCl 3 . Chronoamperograms demonstrated that the onset potential for the codeposition of Mg, Li and Al is -2.100 V, and the codeposition of Mg, Li and Al is formed when the applied potentials are more negative than -2.100 V. The diffusion coefficient of aluminum ions in the melts was determined by different electrochemical techniques. X-ray diffraction and inductively coupled plasma analysis indicated that a, a ? b and b Mg-Li-Al alloys with different lithium and aluminum contents were obtained via potentiostatic and galvanostatic electrolysis.

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Electrochemical formation of Mg–Li alloys at solid magnesium electrode from LiCl–KCl melts

Cited by 36 publications

References 15 publications

Study on the preparation of Mg–Li–Mn alloys by electrochemical codeposition from LiCl–KCl–MgCl2–MnCl2 molten salt

Study on the preparation of Mg–Li–Mn alloys by electrochemical codeposition from LiCl–KCl–MgCl2–MnCl2 molten salt

Electrolytic Deposition and Diffusion of Lithium onto Magnesium-9 Wt Pct Yttrium Bulk Alloy in Low-Temperature Molten Salt of Lithium Chloride and Potassium Chloride

Electrochemical study of the codeposition of Mg–Li–Al alloys from LiCl–KCl–MgCl2–AlCl3 melts

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