氢化镀铜预处理对LaMg0.26Ni3.44Co0.66Al0.14Fe0.14储氢合金电池性能的影响研究

Effect of Hydrogenation and Copper Plating on Properties of LaMg0.26Ni3.44Co0.66Al0.14Fe0.14 Alloy Battery

摘要:

针对AB5型储氢合金电极存在粉化严重、循环寿命短、循环稳定性差等问题，提出对合金粉进行氢化处理的新方法，选取LaMg0.26Ni3.44Co0.66Al0.14Fe0.14为实验原料，根据DSC测试结果，确定吸放氢条件，并进行吸氢镀铜放氢的预处理，预处理后的合金进行电池性能测试，结果表明：吸氢量0.7%合金镀铜放氢后最大放电容量达到318.0 mAh·g-1，且电化学容量衰减率小，循环稳定性好。粒度的影响研究表明：38~48 μm吸氢镀铜放氢合金的最大放电容量达到327.3 mAh·g-1

Abstract:

AB5 hydrogen storage alloy electrodes have some disadvantages in the process of battery charge and discharge such as grave pulverization, short cycle life, and poor cycle stability. In this paper, we selected LaMg0.26Ni3.44Co0.66Al0.14Fe0.14 alloy as raw materials and offered a method to deal with the base hydrogen storage alloy. Based on the DSC test result, the hydrogenation-dehydrogenation condition was determined and a pre-treatment of hydrogenation and copper plating followed by hydrogen release was performed for the alloy. Then the battery properties were studied. The results show that the alloy with 0.7% hydrogen mass and copper plating followed by hydrogen release possesses the max discharge capacity 318.0 mAh·g-1, the decay ratio of discharge capacity is low, and the cycle stability is good. The effect of particle size indicates that 38~48 μm mesh alloy with 0.7% hydrogen mass and copper plating followed by hydrogen release has the max discharge capacity 327.3 mAh·g-1