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Production and electrochemical characterization of Mg-Ni alloys by molten salt electrolysis for Ni-MH batteries

机译:Ni-MH电池熔盐电解Mg-Ni合金的制备及电化学表征

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Mg-Ni alloys are produced by molten salt electrolysis and diffusion method on a nickel plate in KCl-NaCl based melts. Structure, alloy composition and electrochemical properties of these alloys are evaluated. Electrolyte composition and applied current density parameters are studied for the characterization of the alloys. It is found that Mg-Ni alloys with 45 wt% to 49 wt% Ni content which can be defined as MgNi-type alloys, have both higher discharge capacity and good retaining rate (72%). These alloys are mainly composed of Mg2Ni phases and displayed a maximum discharge capacity of 384 mAhg(-1). Increased Ni content is advantageous for the enhancement of the cycle life. At the same time, the discharge capacity of Mg-Ni alloy electrode is found to be decreasing. The highest capacity retaining (85%) rate is observed in the highest Ni content alloys (72 wt% Ni). Electrochemical impedance spectroscopy and potentiodynamic polarization measurements show that the controlling-step of the discharge process changed from a mixed rate determining process at lower depth of discharge to a mass transfer controlled process at higher depth of discharge. The charge transfer resistance increases from 0.5 Omega to 23 Omega with increasing depth of discharge. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
机译:Mg-Ni合金是通过在KCl-NaCl基熔体中在镍板上通过熔融盐电解和扩散方法生产的。对这些合金的结构,合金成分和电化学性能进行了评估。研究了电解质的组成和施加的电流密度参数,以表征合金。发现可以被定义为MgNi型合金的具有45wt%至49wt%的Ni含量的Mg-Ni合金具有更高的放电容量和良好的保持率(72%)。这些合金主要由Mg2Ni相组成,最大放电容量为384 mAhg(-1)。 Ni含量的增加对于延长循环寿命是有利的。同时,发现Mg-Ni合金电极的放电容量降低。在镍含量最高的合金(镍72 wt%)中,观察到了最高的容量保持率(85%)。电化学阻抗谱和电位动力学极化测量结果表明,排放过程的控制步骤从较低排放深度的混合速率确定过程变为较高排放深度的传质控制过程。随着放电深度的增加,电荷转移电阻从0.5Ω增加到23Ω。 (C)2018氢能出版物有限公司。由Elsevier Ltd.出版。保留所有权利。

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