Influence of surface treatment by HCl aqueous solution on electrochemical characteristics of a Mm(Ni–Co–Al–Mn)4.76 alloy for nickel–metal hydride batteries

Imoto, T.; Kato, Kikuko; Higashiyama, Nobuyuki; Kimoto, Mamoru; Itoh, Yasuhiko; Nishio, Koji

doi:10.1016/s0925-8388(98)00842-1

Cited by 11 publications

(2 citation statements)

References 9 publications

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“…Magnetic susceptibility (MS) measurements can be used to monitor the evolution of the count and size of metallic Ni-clusters embedded in the surface oxide [26,34,35]. Both X-ray photoelectron spectroscopy (XPS) [36][37][38][39][40] and Auger electron spectroscopy (AES) [41] have been used to study the surface composition, with the former being able to identify the oxidation state. The acoustic emission (AE) technique has also been used to study the volume change and pulverization of the MH alloy [42,43].…”

Section: Experimental Methods Used In Failure Analysismentioning

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: Experimental Methods Used In Failure Analysismentioning

confidence: 99%

Capacity Degradation Mechanisms in Nickel/Metal Hydride Batteries

Kim

Yasuoka

2016

Batteries

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“…AB 5 -based alloys are all hexagonal (where A = La, Ce, Nd, Pr; B = Ni, Co, Mn, Al) [17][18][19][20][21][22][23][24][25]; d. A 2 B 7 -based alloys (where A = La, Y; B = Ni, Mn) can be hexagonal 2H or rhombohedral 3R polytypes [24,26,27].…”

Section: Introductionmentioning

confidence: 99%

Chemical Structure Comparison via Scanning Electron Microscopy of Spent Commercial Nickel–Metal Hydride Batteries

Walther

2023

Materials

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Back-scattered electron imaging and X-ray elemental mapping were combined in a tabletop scanning electron microscope (SEM) to investigate cross-sections of three AA-type (mignon) nickel–metal hydride (NiMH) batteries from different manufacturers. All batteries underwent 500–800 charge/discharge cycles and reached their end of lifetime after several years as they could no longer hold any significant electric charge (less than 20% of nominal charge capacity), but none showed any short-circuiting. The types of degradation observed in this field study included electrode swelling, metallic nickel formation and carbon incorporation into pores in the positive electrodes and, in the negative electrodes, metal alloy segregation of different elements such as nickel, lanthanum and, in one case, sodium, as well as grain break-up and pore formation. All these phenomena could readily be observed at rather small magnifications. This will be important for the improvement of NiMH batteries, for which new generations with nominally slightly increased charge capacities are being marketed all the time.

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Hydrogen storage alloy development for wide operating temperature nickel-metal hydride battery applications

Nei,

Wang

2024

International Journal of Hydrogen Energy

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Influence of surface treatment by HCl aqueous solution on electrochemical characteristics of a Mm(Ni–Co–Al–Mn)4.76 alloy for nickel–metal hydride batteries

Cited by 11 publications

References 9 publications

Capacity Degradation Mechanisms in Nickel/Metal Hydride Batteries

Capacity Degradation Mechanisms in Nickel/Metal Hydride Batteries

Chemical Structure Comparison via Scanning Electron Microscopy of Spent Commercial Nickel–Metal Hydride Batteries

Hydrogen storage alloy development for wide operating temperature nickel-metal hydride battery applications

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