Nd替代Y对汽车电池负极用储氢合金电化学性能的影响

doi:10.19964/j.issn.1006-4990.2024-0251

Abstract

Abstract:

La_0.15Y_0.85-_x Nd _x Ni_3.2Mn_0.15Al_0.15（x=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（C_max） after 2~3 activations.C_max 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 C_max 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.

Key words: element substitution, Nd, hydrogen storage alloys, phase composition, microscopic morphology, electrochemical performance

CLC Number:

TQ133.3

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.

Figures/Tables 9

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Table 1

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References 20

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x	最大放电容量 C_max/（mA∙h∙g^-1）	容量保持率S₁₀₀/%	高倍率放电性能HRD₉₀₀/%	腐蚀电位/ V	腐蚀电流密度/ （mA·cm^-2）	交换电流密度/ （mA·g^-1）	氢扩散系数/ （10^-10cm²·s^-1）
0	377.8	20.33	79.23	-0.945	6.330	22.82	1.70
0.1	359.5	81.50	14.75	-0.912	5.253	54.54	1.54
0.2	349.8	80.75	70.82	-0.925	6.054	96.36	1.59
0.3	344.9	81.32	76.09	-0.920	5.745	214.72	1.65
0.4	378.8	84.27	82.99	-0.911	5.067	310.07	1.86
0.5	358.7	88.28	69.64	-0.906	4.698	201.42	1.14
0.6	355.7	81.33	74.66	-0.919	5.321	305.91	1.29

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

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