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首页> 外文期刊>International Journal of Electrochemical Science >Phase Structure and Electrochemical Properties of La0.7Ce0.3Ni3.83-xMn0.43Co0.25Al0.26Cu0.48(Fe0.43B0.57)x Hydrogen Storage Alloys
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Phase Structure and Electrochemical Properties of La0.7Ce0.3Ni3.83-xMn0.43Co0.25Al0.26Cu0.48(Fe0.43B0.57)x Hydrogen Storage Alloys

机译：La 0.7 Ce 0.3 Ni 3.83-x Mn 0.43 Co 0.25 < /sub>Al0.26Cu0.48(Fe0.43B0.57） x 氢储存合金

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摘要

Microstructures and electrochemical characteristics of La0.7Ce0.3Ni3.83- xMn0.43Co0.25Al0.26Cu0.48(Fe0.43B0.57)x hydrogen storage alloys have been investigated. X-ray diffractionresults indicate that the pristine alloy is single LaNi5 phase with CaCu5 type hexagonal structure andthe alloys containing Fe0.43B0.57 consist of two phases, LaNi5 matrix phase and La3Ni13B2 secondaryphase. The abundance of La3Ni13B2 phase increases with the increase of x value. The substitution of Niby Fe0.43B0.57 contributes to the activation property of alloy electrodes. Maximum discharge capacity ofthe alloy electrodes monotonically decreases from 302.5 mAh/g (x = 0) mAh/g to 277.1 (x = 0.20) withincreasing x value. High-rate dischargeability of the alloy electrodes first increases with increasing xfrom 0 to 0.15, and then decreases until x increases to 0.20. Cycling stability decreases with increasingx from 0 to 0.20. The adequate substitution of Ni by FeB can improve the overall electrochemicalperformances and reduce the raw cost of alloy electrode.
机译：研究了La0.7Ce0.3Ni3.83-xMn0.43Co0.25Al0.26Cu0.48（Fe0.43B0.57）x储氢合金的组织和电化学特性。 X射线衍射结果表明，原始合金为单层LaNi5相，具有CaCu5型六方结构，含Fe0.43B0.57的合金由LaNi5基体相和La3Ni13B2第二相组成。 La3Ni13B2相的丰度随着x值的增加而增加。 Niby Fe0.43B0.57的取代有助于合金电极的活化性能。合金电极的最大放电容量在增加x值的范围内从302.5 mAh / g（x = 0）mAh / g单调降低到277.1（x = 0.20）。合金电极的高倍率放电率首先随着x从0到0.15的增加而增加，然后降低，直到x增加到0.20。循环稳定性随着从0增加到0.20而降低。 FeB充分替代Ni可以提高整体电化学性能，降低合金电极的原始成本。

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