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Electrochemical properties of the CaNi5−xMnx electrodes synthesized by mechanical alloying
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2020-06-30 , DOI: 10.1002/er.5625 Youssef Dabaki 1 , Chokri Khaldi 1 , Omar ElKedim 2 , Nouredine Fenineche 3 , Jilani Lamloumi 1
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2020-06-30 , DOI: 10.1002/er.5625 Youssef Dabaki 1 , Chokri Khaldi 1 , Omar ElKedim 2 , Nouredine Fenineche 3 , Jilani Lamloumi 1
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In this article, we exhaustively examined the effects of Mn substitution for Ni on the structures and electrochemical characterization of the CaNi5−xMnx (x = 0.2, 0.3, 0.5, 1) alloys prepared by mechanical synthesis for 40 hours at ball to powder weight ratio of 8:1. The characterization of electrodes was examined by X‐ray diffraction, scanning electron microscope and electrochemical tests. In this context, the structural properties for each alloy have two major phases Ni, Ca2Ni7; Ni, CaNi3; Ni, CaNi5; Ni, CaNi3 where x = 0.2, 0.3, 0.5 and 1 respectively. The powder micrograph shows the existence of agglomerates has average particle size between 22 and 35 μm. In addition, the quantification by energy dispersive spectroscopy has been indicated the chemical composition of the all produced alloys is near their nominal composition. All electrodes are activated during the first cycle, independent of the Mn substitution rate. The highest values of discharge capacity and reversibility are obtained for x = 0.3 (125 mAh g−1, 0.17 V) and x = 0.5 (119 mAh g−1, 0.19 V) despite their low cycle stability. The evolution of DH/a2 ratio and the I0 exchange current density for the different Mn substitution rates is in accordance with that of the evolution of discharge capacities. The better kinetic properties is observed for x = 0.5 during electrochemical cycling.
中文翻译：
机械合金化合成的CaNi5-xMnx电极的电化学性能
在本文中，我们详尽地研究了Mn替代Ni对通过球化至室温的40小时机械合成制备的CaNi 5− x Mn x（x = 0.2，0.3，0.5，1 ）合金的结构和电化学特性的影响。粉末重量比为8：1。通过X射线衍射，扫描电子显微镜和电化学测试检查了电极的特性。在这种情况下，每种合金的结构性能具有两个主要相Ni，Ca 2 Ni 7；Ni，CaNi 3；Ni，CaNi 5；Ni，CaNi 3其中x分别为0.2、0.3、0.5和1。粉末显微照片显示，附聚物的存在具有22至35μm的平均粒径。另外，通过能量色散光谱法的定量已经表明所有生产的合金的化学组成接近其标称组成。在第一个循环中，所有电极均被激活，与Mn替代率无关。对于得到的放电容量和可逆性的最高值X = 0.3（125毫安克-1，0.17 V）和X = 0.5（119毫安克-1，0.19 V）尽管它们的低的循环稳定性。D H / a 2比和I 0的演化不同Mn替代率下的交换电流密度与放电容量的变化一致。在电化学循环期间，对于x = 0.5，观察到更好的动力学性能。
更新日期：2020-06-30
中文翻译：
机械合金化合成的CaNi5-xMnx电极的电化学性能
在本文中，我们详尽地研究了Mn替代Ni对通过球化至室温的40小时机械合成制备的CaNi 5− x Mn x（x = 0.2，0.3，0.5，1 ）合金的结构和电化学特性的影响。粉末重量比为8：1。通过X射线衍射，扫描电子显微镜和电化学测试检查了电极的特性。在这种情况下，每种合金的结构性能具有两个主要相Ni，Ca 2 Ni 7；Ni，CaNi 3；Ni，CaNi 5；Ni，CaNi 3其中x分别为0.2、0.3、0.5和1。粉末显微照片显示，附聚物的存在具有22至35μm的平均粒径。另外，通过能量色散光谱法的定量已经表明所有生产的合金的化学组成接近其标称组成。在第一个循环中，所有电极均被激活，与Mn替代率无关。对于得到的放电容量和可逆性的最高值X = 0.3（125毫安克-1，0.17 V）和X = 0.5（119毫安克-1，0.19 V）尽管它们的低的循环稳定性。D H / a 2比和I 0的演化不同Mn替代率下的交换电流密度与放电容量的变化一致。在电化学循环期间，对于x = 0.5，观察到更好的动力学性能。
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