Phase Structure and Electrochemical Properties of Melt-Spun La4MgNi17.5Mn1.5 Hydrogen Storage Alloys

doi:10.1007/s40195-017-0577-4

Abstract

Abstract:

The (La₄MgNi_17.5Mn_1.5) alloys at different melt-spun speeds were prepared by using a vacuum melt-spun furnace, and the phase structure and electrochemical properties of alloys were studied. X-ray diffraction analysis results show that melt-spun La₄MgNi_17.5Mn_1.5 alloys are composed of CeCu₅-type, Pr₅Co₁₉-type and CeNi₂-type phase. As the melt-spun speed increased, the phase abundance of CeCu₅-type increased, but that of Pr₅Co₁₉-type decreased. Scanning electron microscopy-energy-dispersive spectroscopy analysis results show that melt-spun treatment can refine grain and make the alloys homogenization. Electrochemical tests show that all alloys have good activation performance within four cycles. With the increase in melt-spun speed, the cycle stability (S) of the alloys was improved obviously. After 100 cycles, the retention rate (S ₁₀₀) of the alloy increased from 54.82% (as-cast) to 82.29% (25 m/s). Nevertheless, the maximum discharge capacity (C _max) and high-rate dischargeability gradually decreased.

Key words: Hydrogen storage alloy, Melt-spun, Crystal structure, Electrochemical property

Yu Zhang, Fan-Song Wei, Jia-Ning Xiao, Xin Cai. Phase Structure and Electrochemical Properties of Melt-Spun La₄MgNi_17.5Mn_1.5 Hydrogen Storage Alloys[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(11): 1033-1039.

Figures/Tables 10

References

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Samples	Phase	Space group	Phase abundance (%)	Lattice constants (nm)		Cell volume (×10^-3 nm³)
Samples	Phase	Space group	Phase abundance (%)	a	c	Cell volume (×10^-3 nm³)
As-cast	LaNi₅	P6/mmm (191)	47.9	5.0419	4.0091	88.149
	Pr₅Co₁₉	R-3 m (166)	30.0	5.0391	32.3712	711.638
	LaNi₂	Fd-3 m (227)	22.1	7.2278	7.2278	377.677
10 m/s	LaNi₅	P6/mmm (191)	51.8	5.0352	3.9907	87.639
	Pr₅Co₁₉	R-3 m (166)	27.9	5.0375	32.5348	715.362
	LaNi₂	Fd-3 m (227)	20.3	7.2319	7.2319	378.934
15 m/s	LaNi₅	P6/mmm (191)	56.2	5.0308	4.0023	87.743
	Pr₅Co₁₉	R-3 m (166)	26.0	5.0353	32.5316	714.503
	LaNi₂	Fd-3 m (227)	17.8	7.1812	7.1812	370.331
20 m/s	LaNi₅	P6/mmm (191)	60.9	5.0167	3.9803	86.779
	Pr₅Co₁₉	R-3 m (166)	18.3	5.0423	32.4677	715.023
	LaNi₂	Fd-3 m (227)	20.8	7.1949	7.1949	372.543
25 m/s	LaNi₅	P6/mmm (191)	62.8	5.0261	4.0003	87.523
	Pr₅Co₁₉	R-3 m (166)	14.3	5.0538	32.3888	716.549
	LaNi₂	Fd-3 m (227)	22.9	7.1938	7.1938	372.434

Samples	Phase	Space group	Phase abundance (%)	Lattice constants (nm)		Cell volume (×10^-3 nm³)
Samples	Phase	Space group	Phase abundance (%)	a	c	Cell volume (×10^-3 nm³)
As-cast	LaNi₅	P6/mmm (191)	47.9	5.0419	4.0091	88.149
	Pr₅Co₁₉	R-3 m (166)	30.0	5.0391	32.3712	711.638
	LaNi₂	Fd-3 m (227)	22.1	7.2278	7.2278	377.677
10 m/s	LaNi₅	P6/mmm (191)	51.8	5.0352	3.9907	87.639
	Pr₅Co₁₉	R-3 m (166)	27.9	5.0375	32.5348	715.362
	LaNi₂	Fd-3 m (227)	20.3	7.2319	7.2319	378.934
15 m/s	LaNi₅	P6/mmm (191)	56.2	5.0308	4.0023	87.743
	Pr₅Co₁₉	R-3 m (166)	26.0	5.0353	32.5316	714.503
	LaNi₂	Fd-3 m (227)	17.8	7.1812	7.1812	370.331
20 m/s	LaNi₅	P6/mmm (191)	60.9	5.0167	3.9803	86.779
	Pr₅Co₁₉	R-3 m (166)	18.3	5.0423	32.4677	715.023
	LaNi₂	Fd-3 m (227)	20.8	7.1949	7.1949	372.543
25 m/s	LaNi₅	P6/mmm (191)	62.8	5.0261	4.0003	87.523
	Pr₅Co₁₉	R-3 m (166)	14.3	5.0538	32.3888	716.549
	LaNi₂	Fd-3 m (227)	22.9	7.1938	7.1938	372.434

Samples	C _max (mA h g^-1)	N_a	HRD (%)			R (Ω)	I ₀ (mA g^-1)	D (×10^-10 cm² s^-1)
Samples	C _max (mA h g^-1)	N_a	HRD₃₀₀	HRD₆₀₀	HRD₉₀₀	R (Ω)	I ₀ (mA g^-1)	D (×10^-10 cm² s^-1)
As-cast	328.09	2	96.89	89.41	85.61	0.36	199.69	1.331
10 m/s	329.01	2	97.73	92.28	86.98	0.36	196.82	1.388
15 m/s	314.27	3	97.42	90.96	85.92	0.42	180.15	1.209
20 m/s	291.56	3	88.10	67.97	50.00	0.94	140.46	1.092
25 m/s	291.43	4	88.00	65.00	49.50	0.97	138.31	1.023

Samples	C _max (mA h g^-1)	N_a	HRD (%)			R (Ω)	I ₀ (mA g^-1)	D (×10^-10 cm² s^-1)
Samples	C _max (mA h g^-1)	N_a	HRD₃₀₀	HRD₆₀₀	HRD₉₀₀	R (Ω)	I ₀ (mA g^-1)	D (×10^-10 cm² s^-1)
As-cast	328.09	2	96.89	89.41	85.61	0.36	199.69	1.331
10 m/s	329.01	2	97.73	92.28	86.98	0.36	196.82	1.388
15 m/s	314.27	3	97.42	90.96	85.92	0.42	180.15	1.209
20 m/s	291.56	3	88.10	67.97	50.00	0.94	140.46	1.092
25 m/s	291.43	4	88.00	65.00	49.50	0.97	138.31	1.023

Phase Structure and Electrochemical Properties of Melt-Spun La₄MgNi_17.5Mn_1.5 Hydrogen Storage Alloys

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