Improvement in the low-temperature performance of AB5 metal hydride alloys by Fe-addition

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

doi:10.1016/j.jallcom.2011.04.102

Cited by 37 publications

(30 citation statements)

References 59 publications

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“…The rapid deterioration in cycle life caused by increasing Fe-content in A 2 B 7 HAAs was seen previously in AB 5 HAAs [19]. positive and negative electrodes caused by oxides of Mn and Zn [20].…”

Section: Cycle Life and Peak Powersupporting

confidence: 61%

“…Fe5 shows inferior LT electrochemical performance when compared to the Fe-free cell (Fe1), with a 12% lower discharge capacity and a 9% lower mid-point voltage at −20 • C. Higher Fe-content leads to a lower discharge capacity and a lower mid-point discharge voltage, which is consistent with the general trends in AC impedance and magnetic susceptibility measurements reported in Part 1 [10], where RC (the product of charge-transfer susceptibility measurements reported in Part 1 [10], where RC (the product of charge-transfer resistance and double-layer capacitance, reflecting the surface catalytic capability) increases and Ms decreases with increasing Fe-content in the alloy. In previous studies, Fe rendered positive and negative influences on the LT performance of AB2 [18] and AB5 [19] HAAs, respectively. The impact of the addition of Fe on the LT performance of A2B7 HAA is closer to that of AB5 HAA.…”

Section: Cell Capacities At Room Temperature and Low Temperaturementioning

confidence: 78%

“…The accelerated capacity degradation at a temperature above 50 °C is common for HAA and can be attributed to higher degrees of oxidation, leaching and poisoning of the positive electrode [22,23]. The rapid deterioration in cycle life caused by increasing Fe-content in A2B7 HAAs was seen previously in AB5 HAAs [19]. The peak power of cells Fe1 to Fe5 was measured every 50 cycles at 50% DOD and RT.…”

Section: Cycle Life and Peak Powermentioning

confidence: 89%

“…More severe oxidation in the Fe containing alloys may have a role in capacity loss as well, which was observed by SEM/EDS and will be presented in the failure analysis section. Fe improved the charge retention properties of AB2 [18] HAAs and deteriorated those of AB5 [19] HAAs. Similar to LT performance, the effects of Fe for A2B7 HAA are similar to those for AB5 HAA with regard to charge retention performance.…”

Section: Cycle Life and Peak Powermentioning

confidence: 94%

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Fe-Substitution for Ni in Misch Metal-Based Superlattice Hydrogen Absorbing Alloys—Part 2. Ni/MH Battery Performance and Failure Mechanisms

Meng¹,

Kim

Nei³

et al. 2017

Batteries

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Abstract:The electrochemical performance and failure mechanisms of Ni/MH batteries made with a series of the Fe-substituted A 2 B 7 superlattice alloys as the negative electrodes were investigated. The incorporation of Fe does not lead to improved cell capacity or cycle life at either room or low temperature, although Fe promotes the formation of a favorable Ce 2 Ni 7 phase. Fe-substitution was found to inhibit leaching of Al from the metal hydride negative electrode and promote leaching of Co, which could potentially extend the cycle life of the positive electrode. The failure mechanisms of the cycled cells with the Fe-substituted superlattice hydrogen absorbing alloys were analyzed by scanning electron microscopy, energy dispersive spectroscopy and inductively coupled plasma analysis. The failure of cells with Fe-free and low Fe-content alloys is mainly attributed to the pulverization of the metal hydride alloy. Meanwhile, severe oxidation/corrosion of the negative electrode is observed for cells with high Fe-content alloys, resulting in increased internal cell resistance, formation of micro-shortages in the separator and eventual cell failure.Keywords: metal hydride (MH); nickel/metal hydride (Ni/MH) battery; hydrogen absorbing alloy (HAA); superlattice alloy; failure mechanism

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Section: Cycle Life and Peak Powersupporting

confidence: 61%

Section: Cell Capacities At Room Temperature and Low Temperaturementioning

confidence: 78%

Section: Cycle Life and Peak Powermentioning

confidence: 89%

Section: Cycle Life and Peak Powermentioning

confidence: 94%

See 2 more Smart Citations

Fe-Substitution for Ni in Misch Metal-Based Superlattice Hydrogen Absorbing Alloys—Part 2. Ni/MH Battery Performance and Failure Mechanisms

Meng¹,

Kim

Nei³

et al. 2017

Batteries

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“…For start-stop vehicle applications [22], the low-temperature crank power plays a significant role and has led to a great amount of research on enhancement of crank power for MH alloy at low temperature over the past decade [23,24]. The easiest way to increase the HRD performance in the Ni/MH battery is by elemental substitution [25].…”

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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High-performance nickel metal hydride battery anode with enhanced durability and excellent low-temperature discharge capability

Chen,

Liu,

Nei

et al. 2024

Nano Res.

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Improvement in the low-temperature performance of AB5 metal hydride alloys by Fe-addition

Cited by 37 publications

References 59 publications

Fe-Substitution for Ni in Misch Metal-Based Superlattice Hydrogen Absorbing Alloys—Part 2. Ni/MH Battery Performance and Failure Mechanisms

Fe-Substitution for Ni in Misch Metal-Based Superlattice Hydrogen Absorbing Alloys—Part 2. Ni/MH Battery Performance and Failure Mechanisms

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

High-performance nickel metal hydride battery anode with enhanced durability and excellent low-temperature discharge capability

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