Co替代Ni对汽车电池用La0.8Mg0.2Ni3.8-x Co x 储氢合金电化学性能的影响

doi:10.19964/j.issn.1006-4990.2023-0625

Abstract

Abstract:

As-cast La_0.8Mg_0.2Ni_3.8-_x Co _xhydrogen storage alloy was prepared by magnetic levitation melting furnace，the effect of Co content（x=0.65~2.25） on the phase structure and electrochemical performance of hydrogen storage alloy were studied.The results showed that the phases of hydrogen storage alloys with different Co contents were mainly LaNi₅，Ce₅Co₁₉，Pr₅Co₁₉ and CeNi₂ phase.The increase of x value（Co content） in La_0.8Mg_0.2Ni_3.8-_x Co _x hydrogen storage alloy promoted the transformation of Ce₅Co₁₉ phase to Pr₅Co₁₉ phase，and the LaNi₅ phase content in the hydrogen storage alloy was the smallest when x=1.05.As the value of x increased，the hydrogen release platform of the hydrogen storage alloy was firstly decreased and then increased，and the maximum hydrogen storage capacity was firstly increased and then decreased.The capacity retention rate （S₁₀₀） after the 100th charge and discharge was firstly increased and then decreased.When x=0.15，the hydrogen storage alloy obtained the maximum values of C_max and S₁₀₀，which were 352.39 mA·h/g and 81.29% respectively.With the increase of x value from 0.65 to 2.25，the AC impedance of hydrogen storage alloy electrodes was gradually increased，and the exchange current density was gradually decreased.The hydrogen diffusion coefficient was firstly increased and then decreased，and reached its maximum value at x=1.05.The high rate discharge performance was gradually decreased at current densities of 300，600，and 900 mA/g.The results indicated that the exchange current density was the key factor determining the high rate discharge performance of La_0.8Mg_0.2Ni_3.8-_x Co _x hydrogen storage alloy electrodes.

Key words: Co content, hydrogen storage alloy, phase structure, micro morphology, electrochemical performance

CLC Number:

TM912

PENG Weifeng, SHI Wei. Effect of Co replacing Ni on electrochemical performance of La_0.8Mg_0.2Ni_3.8-_x Co _x hydrogen storage alloy for automotive batteries[J]. Inorganic Chemicals Industry, 2024, 56(11): 65-71.

Figures/Tables 14

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试样	物相（质量分数）	晶格常数/nm		晶胞体积/nm³
试样	物相（质量分数）	a	c	晶胞体积/nm³
x=0.65	LaNi₅（57.52%）	5.030 2	3.976 4	0.087
	Ce₅Co₁₉（35.50%）	5.068 4	48.817 1	1.085
	Pr₅Co₁₉（6.14%）	5.013 4	32.608 5	0.710
	CeNi₂（0.84%）	7.157 7	7.157 7	0.366
x=1.05	LaNi₅（50.71%）	5.053 0	4.000 0	0.088
	Ce₅Co₁₉（32.60%）	5.108 0	48.688 0	1.094
	Pr₅Co₁₉（14.22%）	5.054 0	32.639 0	0.719
	CeNi₂（2.47%）	7.192 4	7.192 4	0.372
x=1.45	LaNi₅（53.51%）	5.042 7	3.992 3	0.088
	Ce₅Co₁₉（25.89%）	5.064 0	48.622 3	1.079
	Pr₅Co₁₉（15.16%）	5.041 8	32.614 9	0.718
	CeNi₂（5.43%）	7.191 0	7.191 0	0.372
x=1.85	LaNi₅（57.11%）	5.053 2	3.988 2	0.088
	Ce₅Co₁₉（24.30%）	5.084 7	48.276 3	1.079
	Pr₅Co₁₉（18.06%）	5.044 3	32.354 8	0.713
	CeNi₂（0.53%）	7.111 9	7.111 9	0.360
x=2.25	LaNi₅（60.04%）	5.064 8	3.995 8	0.089
	Ce₅Co₁₉（15.87%）	5.087 8	48.409 0	1.085
	Pr₅Co₁₉（22.11%）	5.065 0	32.605 5	0.724
	CeNi₂（1.98%）	7.004 2	7.004 2	0.343

试样	区域	w（La）/%	w（Mg）/%	w（Ni）/%	w（Co）/%	相
x=0.65	位置①	32.83	—	54.82	12.35	AB₅
	位置②	38.40	0.86	51.27	9.48	A₅B₁₉
	位置③	41.41	1.18	48.53	8.87	AB₂
x=1.05	位置①	31.20	—	48.13	20.67	AB₅
	位置②	34.52	2.71	47.17	15.59	A₅B₁₉
	位置③	42.08	3.26	47.53	7.13	AB₂
x=1.45	位置①	31.21	—	40.70	28.09	AB₅
	位置②	32.28	1.15	41.44	25.14	A₅B₁₉
	位置③	37.57	3.75	39.93	18.75	AB₂
x=2.25	位置①	31.12	—	32.65	26.23	AB₅
	位置②	31.31	2.05	31.80	34.48	A₅B₁₉
	位置③	38.57	3.55	39.43	18.45	AB₂

试样	活化次数/次	最大放电容量/（mA·h·g^-1）	容量保持率/%	腐蚀电位/V	腐蚀电流密度/（mA·g^-1）
x=0.65	2	299.16	68.90	-0.953	3 365.42
x=1.05	2	352.39	81.29	-0.921	5 083.27
x=1.45	2	347.50	80.06	-0.931	3 984.47
x=1.85	3	326.13	79.79	-0.934	3 892.39
x=2.25	3	325.31	71.98	-0.940	3 814.85

试样	HRD₃₀₀/ %	HRD₆₀₀/ %	HRD₉₀₀/ %	交流阻抗R_ct/Ω	交换电流密度I₀/（mA·g^-1）	氢扩散系数D₀/ （×10^-10 cm²·s^-1）
x=0.65	98.70	95.09	90.11	0.292	267.37	0.83
x=1.05	98.54	93.02	85.45	0.378	239.42	1.18
x=1.45	97.87	93.10	84.22	0.432	230.68	1.16
x=1.85	97.26	91.21	84.00	0.469	216.01	1.10
x=2.25	90.83	58.03	32.64	0.575	212.89	0.49

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Effect of Co replacing Ni on electrochemical performance of La_0.8Mg_0.2Ni_3.8-_x Co _x hydrogen storage alloy for automotive batteries

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Effect of Co replacing Ni on electrochemical performance of La0.8Mg0.2Ni3.8-x Co x hydrogen storage alloy for automotive batteries