Effects of Mo additive on the structure and electrochemical properties of low-temperature AB5 metal hydride alloys

Kim, Young; Ouchi, T.; Reichman, B.; Koch, J.; Fetcenko, M.A.

doi:10.1016/j.jallcom.2010.12.205

Cited by 60 publications

(19 citation statements)

References 43 publications

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“…EDS results indicate that the solubility of Mo in the superlattice phases and LaMgNi 4 phase are negligible. The solubility of Mo is 3-5 at% in C14 phase and 0.2 at% in LaNi 5 phase as reported previously [26,27]. It is thus suspected that the segregation of Mo in the superlattice phases is due to the immiscible nature between La and Mo [32].…”

Section: Microstructure Analysissupporting

confidence: 56%

“…Recently, Sm was also used to substitute the costly Nd and Pr [13]. For the B-site element in the misch-Citation: Kwo-Hsiung Young, Xinting Lin, Chuanpeng Jiang and Shigekasu Yasuoka (2018) [13][14][15][16][17][18][19][20][21][22][23][24][25][26]. doi: https://doi.org/10.24218/msear.2018.…”

Section: Introductionmentioning

confidence: 99%

“…The easiest way to increase the HRD performance in the Ni/MH battery is by elemental substitution [25]. Mo, a second-row transition metal, has been demonstrated to improve the low-temperature performance of AB 5 [26] and AB 2 [27]. The partial substitution of Mo for a La-only superlattice alloy also exhibited excellent lowtemperature performance [28] and improved discharge kinetics [29].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Microstructure Analysissupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…The discharge capacities obtained at different temperatures are plotted in Figure 9. Mo-addition in the Mm-based superlattice alloy improved the low-temperature performance of the Ni/MH cells, which is also observed in cells with AB 2 [23], AB 5 [24,25], and La-based superlattice [26,27] MH alloys. While Cell Mo3 gave the highest discharge capacity at −10 and −20 °C, Cell Mo5 was the champion at −30 and −40 °C.…”

Section: Cell Performancementioning

confidence: 59%

“…Among these substitutions, 4.7 at% Co benefits the cycle stability by the largest amount. Compared to other substitutional elements, Mo has little influence on the cycle performance of the superlattice MH alloy, similar to the case of Mo in AB 5 MH alloys [24]. In both alloy families, Mo does not participate in the main phase, but rather segregates out to form its own secondary phase.…”

Section: Failure Modes For Superlattice Alloysmentioning

confidence: 65%

Properties of Nickel Metal Hydride Battery Using Molybdenum-added Superlattice Metal Hydride Alloy

Kim¹

2018

Mater. Sci. Eng. Adv. Res

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The performance of sealed cells comprising of a series of superlattice metal hydride (MH) alloys with compositions of Mm 0.83 Mg 0.17 Ni 2.94-x Al 0.17 Co 0.20 Mo x (Mm is a mixture of La, Pr, and Nd, x = 0.00, 0.05, 0.10, 0.15, and 0.20) was evaluated and compared against other substitutional elements, such as Fe, Mn, and Co. The capacities of cells with Mo-containing alloys are higher than the ones using Mo-free alloy due to the former's higher active material utilization in positive electrodes. Cells with alloy of x = 0.10 showed the highest capacity and high-rate dischargeability, the best low-temperature (−10 and −20 °C), and the longest cycle performance (C-rates charge and discharge). This level of Mo (x = 0.10) is effective in protecting the alloy surface from oxidation. The main failure mechanism of the sudden capacity drop for cells in this study is the venting of gas/ electrolyte mixture from the build-up of internal pressure; this is caused by a dense surface oxide layer formed on the MH alloy blocking the path for gas-recombination during overcharge.

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Gaseous sorption and electrochemical properties of rare-earth hydrogen storage alloys and their representative applications: A review of recent progress

Liang

Lin

Cheng

et al. 2018

Sci. China Technol. Sci.

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Effects of Mo additive on the structure and electrochemical properties of low-temperature AB5 metal hydride alloys

Cited by 60 publications

References 43 publications

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

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

Properties of Nickel Metal Hydride Battery Using Molybdenum-added Superlattice Metal Hydride Alloy

Gaseous sorption and electrochemical properties of rare-earth hydrogen storage alloys and their representative applications: A review of recent progress

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