Cooperative effects of Sm and Mg on electrochemical performance of La–Mg–Ni-based alloys with A 2 B 7 - and A 5 B 19 -type super-stacking structure

Liu, Jingjing; Han, Shumin; Li, Yuan; Zhao, Xiuchen; Yang, Shuqin; Zhang, Xiaochen

doi:10.1016/j.ijhydene.2014.11.024

Cited by 47 publications

(3 citation statements)

References 35 publications

(44 reference statements)

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“…LaSm-based superlattice MH alloys with the La/Sm ratio above 1 were previously reported. While the AB 5 phase cannot be removed completely by annealing in those alloys, the AB 5 phase abundance still decreased with the increase in Sm-content [27,[68][69][70][71][72]. In this experiment, a La/Sm ratio of 0.4 was adopted to attempt to suppress the AB 5 phase abundance.…”

Section: Resultsmentioning

confidence: 99%

Comparison among Constituent Phases in Superlattice Metal Hydride Alloys for Battery Applications

Kim

Ouchi²,

Nei³

et al. 2017

Batteries

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Abstract:The effects of seven constituent phases-CeNi 3 , NdNi 3 , Nd 2 Ni 7 , Pr 2 Ni 7 , Sm 5 Ni 19 , Nd 5 Co 19 , and CaCu 5 -on the gaseous phase and electrochemical characteristics of a superlattice metal hydride alloy made by induction melting with a composition of Sm 14 La 5.7 Mg 4.0 Ni 73 Al 3.3 were studied through a series of annealing experiments. With an increase in annealing temperature, the abundance of non-superlattice CaCu 5 phase first decreases and then increases, which is opposite to the phase abundance evolution of Nd 2 Ni 7 -the phase with the best electrochemical performance. The optimal annealing condition for the composition in this study is 920 • C for 5 h. Extensive correlation studies reveal that the A 2 B 7 phase demonstrates higher gaseous phase hydrogen storage and electrochemical discharge capacities and better battery performance in high-rate dischargeability, charge retention, and cycle life. Moreover, the hexagonal stacking structure is found to be more favorable than the rhombohedral structure.

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Section: Resultsmentioning

confidence: 99%

Comparison among Constituent Phases in Superlattice Metal Hydride Alloys for Battery Applications

Kim

Ouchi²,

Nei³

et al. 2017

Batteries

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“…After [24] . La-Mg-Ni based hydrogen storage alloys synthesized by the classical methods have typical discharge capacities change between 350 mAh/g and 365 mAh/g [25] . The discharge capacities presented in Fig.…”

Section: The Hydrogen Storage Characteristics Of the Synthesized Alloysmentioning

confidence: 99%

Direct synthesis of La-Mg-Ni-Co type hydrogen storage alloys from oxide mixtures

Aybar

Anık

2017

Journal of Energy Chemistry

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“…Hydride-forming AB n -type alloys (A = rare earth, B = transition metal) are widely used for hydrogen storage [1], as well as negative electrode materials for nickel-metal hydride (Ni-MH) batteries [2]. Recently, (A, Mg)Ni-based AB n alloys (3 ≤ n ≤ 4) with stacking structures have been developed for hydrogen storage [3,4], with the capacity increasing from 1.5 wt.% for AB 5 -type alloys to 1.8 wt.% for AB n (3 ≤ n ≤ 4)-type alloys [5][6][7][8]. AB 2 -type alloys with a C15 Laves phase structure possess more tetrahedral sites than AB 5 and AB n alloys (3 ≤ n ≤ 4) to accommodate hydrogen atoms; thus, a higher hydrogen absorption capacity is foreseen [9].…”

Section: Introductionmentioning

confidence: 99%

Structural Evolution and Hydrogen Sorption Properties of YxNi2−yMny (0.825 ≤ x ≤ 0.95, 0.1 ≤ y ≤ 0.3) Laves Phase Compounds

Shen,

Paul-Boncour,

et al. 2024

Inorganics

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The YxNi2−yMny system was investigated in the region 0.825 ≤ x ≤ 0.95, 0.1 ≤ y ≤ 0.3. The alloys were synthesized by induction melting and corresponding annealing. The substitution of Mn for Ni (y = 0.1) favors the formation of a C15 structure with disordered Y vacancies against the superstructure of Y0.95Ni2. For y = 0.2 and 0.3, Mn can substitute in both Y and Ni sites. Single-phase compounds with a C15 structure can be formed by adjusting both the Y and Mn contents. Their hydrogen absorption–desorption properties were measured by pressure–composition isotherm (PCI) measurements at 150 °C, and the hydrides were characterized at room temperature by X-ray diffraction and TG–DSC experiments. The PCIs show two plateaus corresponding to the formation of crystalline and amorphous hydrides. The heating of the amorphous hydrides leads to an endothermic desorption at first and then a recrystallization into Y(Ni, Mn)3 and YHx phases. At higher temperatures, the Y hydride desorbs, and a recombination into a Y(Ni, Mn)2 Laves phase compound is observed. For y = 0.1, vacancy formation in the Y site and partial Mn substitution in the Ni site enhance the structural stability and suppress the hydrogen-induced amorphization (HIA). However, for a larger Mn content (y ≥ 0.2), Mn substitutes also in the Y sites at the expense of Y vacancies. This yields worse structural stability upon hydrogenation than for y = 0.1, as the mean ratio r(Y, Mn)/r(Ni/Mn) becomes larger than for y = 0.1 r(Y, ☐)/r(Ni/Mn).

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Cooperative effects of Sm and Mg on electrochemical performance of La–Mg–Ni-based alloys with A 2 B 7 - and A 5 B 19 -type super-stacking structure

Cited by 47 publications

References 35 publications

Comparison among Constituent Phases in Superlattice Metal Hydride Alloys for Battery Applications

Comparison among Constituent Phases in Superlattice Metal Hydride Alloys for Battery Applications

Direct synthesis of La-Mg-Ni-Co type hydrogen storage alloys from oxide mixtures

Structural Evolution and Hydrogen Sorption Properties of YxNi2−yMny (0.825 ≤ x ≤ 0.95, 0.1 ≤ y ≤ 0.3) Laves Phase Compounds

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