Influence of Different Electrolyte Concentrations on the Performance of an AB<sub>2</sub>-Type Alloy

Martínez, Paula; Ruiz, Fabricio; Visintín, Arnaldo

doi:10.1149/2.042403jes

Cited by 5 publications

(2 citation statements)

References 26 publications

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“…While studies of degradation in MH alloys such as AB 2 [147][148][149][150][151][152][153], Mg-Ni [154][155][156][157], and V-based body-center-cubic [158] are available, we will singularly focus on the discussion of misch-metal based AB 5 and A 2 B 7 superlattice MH alloys and their related electrode properties. In this section, improvements in cycle stability related to the negative electrodes are summarized in Table 5 and are categorized by alloy formula, alloy preparation, alloy post-treatment, electrode additives, and different electrode types.…”

Section: Negative Electrodementioning

confidence: 99%

Capacity Degradation Mechanisms in Nickel/Metal Hydride Batteries

Kim

Yasuoka

2016

Batteries

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The consistency in capacity degradation in a multi-cell pack (>100 cells) is critical for ensuring long service life for propulsion applications. As the first step of optimizing a battery system design, academic publications regarding the capacity degradation mechanisms and possible solutions for cycled nickel/metal hydride (Ni/MH) rechargeable batteries under various usage conditions are reviewed. The commonly used analytic methods for determining the failure mode are also presented here. The most common failure mode of a Ni/MH battery is an increase in the cell impedance due to electrolyte dry-out that occurs from venting and active electrode material degradation/disintegration. This work provides a summary of effective methods to extend Ni/MH cell cycle life through negative electrode formula optimizations and binder selection, positive electrode additives and coatings, electrolyte optimization, cell design, and others. Methods of reviving and recycling used/spent batteries are also reviewed.

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Section: Negative Electrodementioning

confidence: 99%

Capacity Degradation Mechanisms in Nickel/Metal Hydride Batteries

Kim

Yasuoka

2016

Batteries

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“…Generally, KOH solutions with concentrations varying from 4.0 M to 8.5 M are used for Ni/MH batteries in the research field and for commercial applications [11,[56][57][58]. In this study, the electrolyte concentration (KOH + Cs 2 CO 3 ) is fixed at 6.77 M. Concentrations of KOH and Cs 2 CO 3 in various electrolytes are shown in Table 2.…”

Section: Electrochemical Performances For Electrolytes With Cs 2 Co 3mentioning

confidence: 99%

Effects of Cs2CO3 Additive in KOH Electrolyte Used in Ni/MH Batteries

Yan

Nei²,

et al. 2017

Batteries

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Abstract:The effects of Cs 2 CO 3 addition in a KOH-based electrolyte were investigated for applications in nickel/metal hydride batteries. Both MgNi-based and Laves phase-related body-centered cubic solid solution metal hydride alloys were tested as the anode active materials, and sintered β-Ni(OH) 2 was used as the cathode active material. Certain amounts of Cs 2 CO 3 additive in the KOH-based electrolyte improved the electrochemical performances compared with a conventional pure KOH electrolyte. For example, with Laves phase-related body-centered cubic alloys, the addition of Cs 2 CO 3 to the electrolyte improved cycle stability (for all three alloys) and discharge capacity (for the Al-containing alloys); moreover, in the 0.33 M Cs 2 CO 3 + 6.44 M KOH electrolyte, the discharge capacity of Mg 52 Ni 39 Co 3 Mn 6 increased to 132%, degradation decreased to 87%, and high-rate dischargeability stayed the same compared with the conventional 6.77 M KOH electrolyte. The effects of Cs 2 CO 3 on the physical and chemical properties of Mg 52 Ni 39 Co 3 Mn 6 were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, inductively coupled plasma, and electrochemical impedance spectroscopy. The results from these analyses concluded that Cs 2 CO 3 addition changed both the alloy surface and bulk composition. A fluffy layer containing carbon was found covering the metal particle surface after cycling in the Cs 2 CO 3 -containing electrolyte, and was considered to be the main cause of the reduction in capacity degradation during cycling. Also, the Cs 2 CO 3 additive promoted the formations of the C-O and C=O bonds on the alloy surface. The C-O and C=O bonds were believed to be active sites for proton transfer during the electrochemical process, with the C-O bond being the more effective of the two. Both bonds contributed to a higher surface catalytic ability. The addition of 0.33 M Cs 2 CO 3 was deemed optimal in this study.

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Corrosion in Nickel-Metal Hydride (Ni-MH) Batteries—Recent Developments

Monnier,

Zhang,

Paul-Boncour

et al. 2024

Corrosion and Degradation in Fuel Cells, Supercapacitors and Batteries

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Influence of Different Electrolyte Concentrations on the Performance of an AB₂-Type Alloy

Cited by 5 publications

References 26 publications

Capacity Degradation Mechanisms in Nickel/Metal Hydride Batteries

Capacity Degradation Mechanisms in Nickel/Metal Hydride Batteries

Effects of Cs2CO3 Additive in KOH Electrolyte Used in Ni/MH Batteries

Corrosion in Nickel-Metal Hydride (Ni-MH) Batteries—Recent Developments

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Influence of Different Electrolyte Concentrations on the Performance of an AB2-Type Alloy

Cited by 5 publications

References 26 publications

Capacity Degradation Mechanisms in Nickel/Metal Hydride Batteries

Capacity Degradation Mechanisms in Nickel/Metal Hydride Batteries

Effects of Cs2CO3 Additive in KOH Electrolyte Used in Ni/MH Batteries

Corrosion in Nickel-Metal Hydride (Ni-MH) Batteries—Recent Developments

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Influence of Different Electrolyte Concentrations on the Performance of an AB₂-Type Alloy