新型无镁YNi3.5-xAlx(x=0~0.3)储氢合金的结构和电化学性能

doi:10.11896/cldb.19050139

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Abstract YNi_3.5-xAl_x(x=0,0.05,0.1,0.15,0.2,0.3) hydrogen storage alloys were prepared by vacuum arc melting and vacuum annealing heat treatment.Structural analysis of the alloys showed that the main phase of the alloys was A₂B₇ superlattice structural phase.The main phase of alloys was Gd₂Co₇-type. When x=0,which transformed to Ce₂Ni₇-type after adding Al element.Aluminium occurs mainly at the 6h site of CaCu₅-type slab in Ce₂Ni₇ phase althongh the solubility is limited.When x>0.1, the CaCu₅ phase as the second phase appears in the alloy, which has the greater solid solution for Al elecment than that of the main phase.The greater the solid solution in Ce₂Ni₇ phase for Al elecment, the smaller the volume mismatch between Laves slab and CaCu₅ slab in superlattice. The plateau pressure during hydrogen absorption/desorption of alloy electrodes decreases with the increase of Al element,while the plateau pressure increases slightly due to the appearance of CaCu₅ -type phase after x>0.1. The maximum discharge capacity of alloy electrodes increases from 105.52 mAh·g^-1 at x=0 to 282.7 mAh·g^-1 at x=0.3 with the increase of Al content. With further increasing Al content, especially when x≥0.1, Al was dissolved greater into the second phase of CaCu₅ while the solid solution in the main phase of Ce₂Ni₇ decreases gradually. The cyclic stability of alloy electrodes decreases from 52.89% at x=0 to 6.5% at x=0.3 due to the increase of volume mismatch between Laves slab and CaCu₅ slab.The electrode kinetics of Y₂Ni₇ alloy electrodes was poor, and the HRD₉₀₀ was only 5.83%. With increasing the Al content, the dynamic properties of the alloys first increased and then decreased, and HRD₉₀₀ was 79.04% at x=0.15.High rate dischargeability characteristics of alloy electrode was controlled by the hydrogen diffusion rate in the bulk alloy when x≤0.15 and by the charge transfer rate on the alloy electrode surface when x>0.15.

Key words： superlattice structure mismatch plateau pressure electrochemical properties

Published: 14 July 2020

CLC number:

TG139.7

Fund:This work was financially supported by the National Natural Science Fund (51761026), Ningxia Natural Science Fund (2019AAC03003) and the Fund of the State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology (SKLAB02019004).

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	DENG Anqiang
	LUO Yongchun
	WANG Hao
	ZHAO Lei
	ZHENG Kun

Cite this article:

DENG Anqiang,LUO Yongchun,WANG Hao, et al. Structure and Electrochemical Properties of New Mg-free YNi_3.5-xAl_x(x=0—0.3) Hydrogen Storage Alloys[J]. Materials Reports, 2020, 34(14): 14110-14115.

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http://www.mater-rep.com/EN/10.11896/cldb.19050139 OR http://www.mater-rep.com/EN/Y2020/V34/I14/14110

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