Effect of Y substitution on the high rate dischargeability of AB4.6 alloys as an electrode material for nickel metal hydride batteries

Tan, Cheng; Ouyang, Liuzhang; Wang, Hui; Deng, Min; Liao, Canhui; Xiao, Fangming; Tang, Renheng; Zhu, Min

doi:10.1016/j.jallcom.2020.156641

Cited by 10 publications

(2 citation statements)

References 47 publications

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“…The relative lower capacity for Y is due to the higher plateau pressure. Electrochemical properties for similar alloys have been studied and shown interesting capacity and cycle life [50,51]. Therefore, by further compositional adjustment of this compound, the pressure can be optimized thus leading to very promising properties for practical applications.…”

Section: 22mentioning

confidence: 99%

Improvement of reversible H storage capacity by fine tuning of the composition in the pseudo-binary systems A2-La Ni7 (A = Gd, Sm, Y, Mg)

Zhang

Madern

Monnier

et al. 2021

Journal of Alloys and Compounds

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A2B7 compounds (A = rare earth or Mg, B = transition metal) are widely studied as active materials for negative electrode in Ni-MH batteries. By playing on the substitution rate of both A and B elements, it is possible to prepare various compositions. This strategy will help to improve the properties, for example get a higher reversible hydrogen capacity and a well-adapted hydrogen sorption pressure. Indeed, A can be almost all light rare earths (La to Gd), yttrium and alkaline earth metals (Mg or Ca), whereas B can contain various late transition metals (Mn to Ni). To understand the effects of composition on the physicochemical properties of La2Ni7-based compound, various pseudo-binary systems have been investigated: Gd2-xLaxNi7 (x = 0, 0.6, 1, 1.5), Sm2-xLaxNi7 (x = 0, 0.5, 1, 1.5), Y2-xLaxNi7 (x = 0, 0.4, 0.5, 0.6, 0.8, 1, 1.5, 1.75) and A0.5La1.1Mg0.4Ni7 (A = Sm, Gd and Y). To determine their crystallographic properties, X-ray diffraction analysis was performed followed by Rietveld refinement. Thermodynamic properties regarding reversible hydrogen sorption were investigated at room temperature. Quaternary compounds present drastically improved sorption properties in the frame of practical energy storage applications with reversible capacity equivalent to 400 mAh/g for the compound La1.1Sm0.5Mg0.4Ni7.

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Section: 22mentioning

confidence: 99%

Improvement of reversible H storage capacity by fine tuning of the composition in the pseudo-binary systems A2-La Ni7 (A = Gd, Sm, Y, Mg)

Zhang

Madern

Monnier

et al. 2021

Journal of Alloys and Compounds

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“…In view of the above application scenarios and market demands, researchers never cease to pursue improvements in gravimetric energy density and applicability of wide temperature range for safer Ni-MH batteries [6]. Ouyang et al [7] studied that the substitution of Y contributed to the increase in the Ce 2 Ni 7 -type phase revealing maximum discharge capacity of 350.4 mAh g -1 for AB 4.6 alloys and the substitution of Sm demonstrated a high-power performance of 81.4% at 3000 mA g -1 [8].…”

Section: Introductionmentioning

confidence: 99%

Superior electrochemical characteristics of A2B7-type hydrogen storage alloy at ultralow temperature with the addition of alane

Liang

Yan

et al. 2021

J Mater Sci

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In an attempt to enhance the low-temperature dischargeability of A 2 B 7 -type hydrogen storage alloy, the addition of alane (AlH 3 ) by convenient ball milling method was investigated based on La-Y-Ni superlattice alloy containing Y 2 Ni 7type phase and YNi 3 -type phase primarily. The maximum discharge capacity of the composite with doping 1 wt.% AlH 3 increased by 364.2% reaching 208.9 mAh g -1 at 233 K compared with the pristine sample. The initial high-rate discharge capacity of doping 1 wt.% AlH 3 sample reached 151.7 mAh g -1 at 4000 mA g -1 current density. The improvement could be ascribed to strengthening of hydrogen diffusion channel and acceleration of H-kinetics at low temperatures derived from formation of new porous structure and modification of lattice defects by dissolution of aluminum on the surface. It has made a powerfully contribution to a pace of commercialization of A 2 B 7 -type superlattice hydrogen storage alloy applying in high altitude or latitude regions.

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High temperature phase transformation and low temperature electrochemical properties of La1.9Y4.1Ni20.8Mn0.2Al H2-storage alloy

Zhou

Wang

Xiong

et al. 2022

International Journal of Hydrogen Energy

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Effect of Y substitution on the high rate dischargeability of AB4.6 alloys as an electrode material for nickel metal hydride batteries

Cited by 10 publications

References 47 publications

Improvement of reversible H storage capacity by fine tuning of the composition in the pseudo-binary systems A2-La Ni7 (A = Gd, Sm, Y, Mg)

Improvement of reversible H storage capacity by fine tuning of the composition in the pseudo-binary systems A2-La Ni7 (A = Gd, Sm, Y, Mg)

Superior electrochemical characteristics of A2B7-type hydrogen storage alloy at ultralow temperature with the addition of alane

High temperature phase transformation and low temperature electrochemical properties of La1.9Y4.1Ni20.8Mn0.2Al H2-storage alloy

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