Phase structures and electrochemical properties of La–Mg–Ni-based hydrogen storage alloys with superlattice structure

Liu, Jingjing; Han, Shumin; Li, Yuan; Zhang, Lu; Zhang, Xiaochen; Yang, Shuqin; Liu, Baozhong

doi:10.1016/j.ijhydene.2016.08.149

Cited by 65 publications

(21 citation statements)

References 106 publications

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“…In earlier superlattice MH alloy studies of various phases' contributions to the EC performances, phases are grouped according to the phase stoichiometry, such as AB 3 [28][29][30]. In this study, we correlated the properties with the phase stoichiometry, and the resulted R 2 s are summarized and shown in the first three columns of Table 8.…”

Section: Performance Correlation With Phase Stoichiometrymentioning

confidence: 99%

“…Several comparative works on the EC performances of various superlattice phases were previously reported and are summarized as follows. In a (LaMg)Ni x (x = 3, 3.5, and 3.8) system, the capacity decreased, and both HRD and cycle stability increased with the increase of x from 3 to 3.5 and finally 3.8 [28]. In a (LaY)(NiMnAl) x (x = 3, 3.5, and 3.8) system, both capacity and cycle stability reached the maximum at x = 3.5, and increase of x from 3 to 3.5 and finally 3.8 [28].…”

Section: Introductionmentioning

confidence: 99%

“…In a (LaMg)Ni x (x = 3, 3.5, and 3.8) system, the capacity decreased, and both HRD and cycle stability increased with the increase of x from 3 to 3.5 and finally 3.8 [28]. In a (LaY)(NiMnAl) x (x = 3, 3.5, and 3.8) system, both capacity and cycle stability reached the maximum at x = 3.5, and increase of x from 3 to 3.5 and finally 3.8 [28]. In a (LaY)(NiMnAl)x (x = 3, 3.5, and 3.8) system, both capacity and cycle stability reached the maximum at x = 3.5, and HRD increased with the increase in x [29].…”

Section: Introductionmentioning

confidence: 99%

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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: Performance Correlation With Phase Stoichiometrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Kim

Ouchi²,

Nei³

et al. 2017

Batteries

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“…While the conventional active material in the negative electrode of Ni/MH batteries is a rare-earth (RE) based AB 5 metal hydride (MH) alloy, the superlattice MH alloy has become increasingly attractive over the last decade due to its higher energy density, superior high-rate dischargeability (HRD), low self-discharge, improved low-temperature, and hightemperature performances compared to the AB 5 alloy [2−8]. The name of superlattice comes from its unique arrangement of alternative stacking of A 2 B 4 and different numbers of AB 5 slabs along the c-axis of the crystal [9]. For example, one A 2 B 4 plus one AB 5 leads to AB 3 stoichiometry, and one A 2 B 4 plus two AB 5 renders A 2 B 7 stoichiometry.…”

Section: Introductionmentioning

confidence: 99%

Effects of Molybdenum to the Hydrogen Storage and Electrochemical Properties of Superlattice Metal Hydride Alloy

Kim¹

2018

Mater. Sci. Eng. Adv. Res

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where Mm is a mixture of La, Pr, and Nd and x = 0.00, 0.05, 0.10, 0.15, and 0.20, prepared by induction melting method were studied. The Mo segregates out of the main phase to form a metallic secondary phase, leading to a larger reactive surface area. The unit cell of the main Nd 2 Ni 7 increases with an increase in Mo-content through changes in both phase composition and abundance. The addition of Mo reduces the abundance of the main Nd 2 Ni 7 phase, and consequently lowers both the gaseous phase storage and electrochemical discharge capacities. However, Mo also promotes the formation of a Nd 5 Co 19 phase, which contributes to a higher surface reactive area at both room temperature and −40°C. A 1.1 at% of Mo partially replacing Ni is recommended for improvement in low-temperature performance without sacrificing the discharge capacities and high-rate dischargeability owing to the improvement in the surface catalytic ability. In addition, the effects of Mo substitutions to the electrochemical properties of the superlattice alloy are also compared to those from other substitutions, such as Mn, Fe, and Co.

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“…The A-site of the superlattice MH alloy contains both rare-earth (RE) and alkaline earth (usually Mg) elements. While almost all academic research has focused on the single RE element (La or Nd)-based superlattice MH alloys (for reviews, see [9][10][11]), commercial applications have adopted the Mm composition for a higher cycle stability [2,12]. In the past, a few papers about the substitution works performed in the Mm-based superlattice alloy family with Al [13], Mn [14,15], Fe [16,17], Co [18][19][20], and Ce [21] were published, but a systematic performance comparison between a Mm-based superlattice MH alloy and a standard AB 5 MH alloy is absent.…”

Section: Introductionmentioning

confidence: 99%

Performance Comparison between AB5 and Superlattice Metal Hydride Alloys in Sealed Cells

Koch¹,

Kim

Nei³

et al. 2017

Batteries

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High-power cylindrical nickel metal/hydride batteries using a misch metal-based Al-free superlattice alloy with a composition of La 11.3 Pr 1.7 Nd 5.1 Mg 4.5 Ni 63.6 Co 13.6 Zr 0.2 were fabricated and evaluated against those using a standard AB 5 metal hydride alloy. At room temperature, cells made with the superlattice alloy showed a 40% lower internal resistance and a 59% lower surface charge-transfer resistance compared to cells made with the AB 5 alloy. At a low temperature (−10 • C), cells made with the superlattice alloy demonstrated an 18% lower internal resistance and a 60% lower surface charge-transfer resistance compared to cells made with the AB 5 alloy. Cells made with the superlattice alloy exhibited a better charge retention at −10 • C. A cycle life comparison in a regular cell configuration indicated that the Al-free superlattice alloy contributes to a shorter cycle life as a result of the pulverization from the lattice expansion of the main phase.

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Phase structures and electrochemical properties of La–Mg–Ni-based hydrogen storage alloys with superlattice structure

Cited by 65 publications

References 106 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

Effects of Molybdenum to the Hydrogen Storage and Electrochemical Properties of Superlattice Metal Hydride Alloy

Performance Comparison between AB5 and Superlattice Metal Hydride Alloys in Sealed Cells

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