Study on the electrochemical behavior of Mg and Al ions in LiCl-KCl melt and preparation of Mg-Al alloy

Li, Shaolong; Che, Yusi; Li, Chenyao; Shu, Yongchun; He, Jilin; Yang, Bin; Song, Jianxun

doi:10.1016/j.jma.2020.06.020

Cited by 9 publications

(6 citation statements)

References 30 publications

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“…Four potential platforms are observed in the figure. With the current intensity of −16 mA, the first deposition platform corresponds to the reduction of Al at −1.10 V, this current density (0.030 A/cm 2 ) is very different from the current density of Al precipitation in the literature (0.07, 0.093 A/cm 2 ), [ 27 ] but they are all within an order of magnitude. These differences are due to different systems and different temperatures.…”

Section: Resultsmentioning

confidence: 59%

“…At 953 K,

E_{Al / {Al}^{3 +}}^{* 0} = - 1.85 V

, the standard reduction potential of Al 3+ at 953 K is −1.77 V. Compared to reference (−1.66 V), [ 27 ] the difference between the calculated value and the standard reduction potential is smaller.…”

Section: Resultsmentioning

confidence: 95%

“…In this experiment, a lower temperature (653 K) was used to meet the requirements for preparing Li‐Al alloy. Compared to the literature (953 K), [ 27 ] it saves more energy and reduces electrolyte volatilization.…”

Section: Resultsmentioning

confidence: 97%

“…[ 25 ] The reduction of the three‐electron exchange of Al 3+ on the tungsten electrode was controlled by the rate of mass transfer in LiCl‐NaCl/KCl molten salts. [ 26,27 ] Sun investigated the electrochemical behaviour of Al 3+ in a LiCl‐KCl‐AlF 3 melt, measured the diffusion coefficient of Al 3+ by cyclic voltammetry (CV), and argued that the reduction of Al 3+ is not completely reversible. [ 28 ]…”

Section: Introductionmentioning

confidence: 99%

“…[25] The reduction of the three-electron exchange of Al 3+ on the tungsten electrode was controlled by the rate of mass transfer in LiCl-NaCl/KCl molten salts. [26,27] Sun investigated the electrochemical behaviour of Al 3+ in a LiCl-KCl-AlF 3 melt, measured the diffusion coefficient of Al 3+ by cyclic voltammetry (CV), and argued that the reduction of Al 3+ is not completely reversible. [28] Based on the literature survey, the electrochemical process of Al 3+ has not been investigated in LiCl-KCl-AlCl 3 melt, and most studies have not focused on theoretical guidance for the preparation of battery-grade Li-Al alloy by electrolysis.…”

Section: Introductionmentioning

confidence: 99%

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Study on the electrochemical behaviour of Al³⁺ in LiCl‐KCl‐AlCl₃ melt

Zhang

Zhao

2022

Can J Chem Eng

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The electrochemical behaviour of Al3+ reduction on a tungsten electrode in LiCl‐KCl‐AlCl3 molten salt was investigated by electrochemical techniques. Using cyclic voltammetry (CV) and square wave voltammetry (SWV), Al3+ was reduced to Al in one step, and Li was deposited on Al to form Al‐Li alloys of different compositions. According to chronoamperometry (CA), co‐deposition of Li‐Al alloys can be obtained at cathode current densities greater than 0.045 A cm−2 or cathode potentials lower than −2.28 V (vs. Ag/AgCl). The apparent standard potential was calculated using the equilibrium electrode potential obtained from the open‐circuit chronopotentiometry. Al3+ diffusion coefficient calculated by CV at 703 K is 0.82 × 10−5 cm2/s. In addition, the diffusion activation energy of Al3+ in LiCl‐KCl‐AlCl3 molten salt was also obtained using the Arrhenius equation. The linear polarization was used to calculate exchange current density at different temperatures. Based on the theoretical model of metal nucleation deposition developed by Scharifker and Hills, the nucleation process of Al3+ involves instantaneous nucleation in the range of 673~763 K.

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Section: Resultsmentioning

confidence: 59%

“…At 953 K,