Research & Development

Effect of Nd replacing Y on electrochemical performance of hydrogen storage alloys for automotive battery anodes

  • CAO Shengliang ,
  • ZHENG Biaodi ,
  • ZHOU Xi ,
  • MENG Ranhao
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  • 1. Jiyuan vocational and technical college,Jiyuan 459000,China
    2. Zhengzhou University,Zhengzhou 450001,China

Received date: 2024-05-07

  Online published: 2025-04-21

Abstract

La0.15Y0.85-x Nd x Ni3.2Mn0.15Al0.15x=0~0.6) hydrogen storage alloy for automotive battery anode was prepared by replacing Y with A-end Nd element.The phase structure,microstructure,and electrochemical performance of hydrogen storage alloys with different Nd contents replacing Y were investigated.The results showed that when x=0~0.3,the hydrogen storage alloy was mainly composed of Ce2Ni7 and LaNi5 phases,when x≥0.4,the hydrogen storage alloy was mainly composed of Ce2Ni7 and PuNi3 phases.As the x value increased from 0 to 0.6,the cell parameters a and c of the hydrogen storage alloy gradually was increased,while c/a was gradually decreased.After replacing Y with different contents of Nd,hydrogen storage alloy electrodes could achieve maximum discharge capacity(Cmax) after 2~3 activations.Cmax had a linear correlation with the abundance of Ce2Ni7 type phases in the hydrogen storage alloy.The higher the abundance of Ce2Ni7 type phases,the greater the Cmax of the hydrogen storage alloy.As the x value increased from 0.2 to 0.6,the S100 of the hydrogen storage alloy was firstly increased and then decreased.The S100 of the hydrogen storage alloy with added Nd element was higher than that of the hydrogen storage alloy without Nd addition.Moreover,the x=0.4 hydrogen storage alloy had a high S100 and a large discharge capacity.The cycling stability of the hydrogen storage alloy electrode was mainly determined by its corrosion resistance in alkaline solution.At the same discharge current density,the high rate discharge performance of hydrogen storage alloys was highest at x=0.4.The high rate discharge performance of hydrogen storage alloy electrodes was mainly determined by the hydrogen diffusion coefficient D0 when x=0 and 0.1,and determined by the exchange current density I0 and hydrogen diffusion coefficient D0 when x=0.2~0.6.

Cite this article

CAO Shengliang , ZHENG Biaodi , ZHOU Xi , MENG Ranhao . Effect of Nd replacing Y on electrochemical performance of hydrogen storage alloys for automotive battery anodes[J]. Inorganic Chemicals Industry, 2025 , 57(4) : 45 -51 . DOI: 10.19964/j.issn.1006-4990.2024-0251

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