Electrochemical investigations of activation and degradation of hydrogen storage alloy electrodes in sealed Ni/MH battery

Chen, W.X.; Xu, Zhihua; Tu, Jiangping

doi:10.1016/s0360-3199(01)00136-7

Cited by 12 publications

(5 citation statements)

References 10 publications

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“…The mechanical disintegration of the positive electrode may include breakage of the Ni-foam substrate due to large amounts of stress from electrode expansion/distortion [110], especially in a small wounded cylindrical cell [111], and separation of spherical particles from the substrate [112]. Venting occurs when high pressure (mostly H 2 ) is built up inside the cell primarily from inadequate gas recombination capabilities of the MH alloy surface and/or unbalanced capacity distribution [113], which results in reduced electrolyte content [114].…”

Section: Capacity Degradationmentioning

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: Capacity Degradationmentioning

confidence: 99%

Capacity Degradation Mechanisms in Nickel/Metal Hydride Batteries

Kim

Yasuoka

2016

Batteries

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“…Chen et al [12] investigated electrochemical activation and degradation of hydrogen storage alloy electrodes in sealed Ni/ MH battery. Young et al [13] conducted the Ni/MH battery study and revealed the effects of H 2 O 2 addition to the cell balance and self-discharge with AB 5 and A 2 B 7 alloys.…”

Section: Introductionmentioning

confidence: 99%

Self-discharge characteristics and performance degradation of Ni-MH batteries for storage applications

Zhu

Tatarchuk

2014

International Journal of Hydrogen Energy

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“…Hydrogen storage alloys (HMs) have been actively investigated as a high capacity negative material of nickel−metal hydride batteries for use in various electronic devices and hybrid low-emission vehicles. − In the past few decades, many metal hydrides, such as AB 5 -type rare-earth metal alloys, − AB 2 -type Laves phase alloys, , A 2 B-type Mg-based alloys, , and AB-type intermetallic compounds, , have been explored, and a large amount of work, such as the optimization of alloy composition − and surface modifications, − has been done to improve the electrochemical capacity and high rate capability of these materials. Though some of the Mg-based alloys have very high capacities of ≥600 mAh/g, their cycling abilities and poor dynamics are insufficient for practical applications. , At the present state of the art, the commercially used MHs usually have a reversible capacity of ∼300 mAh/g, , and therefore, the search for new hydrogen storage materials with higher energy density has been continuously carried out in recent years.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Hydrogen Storage Behaviors of Ultrafine Amorphous Co−B Alloy Particles

2004

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Ultra-fine amorphous alloy particles (UAAP) of Co−B were synthesized and investigated as an anode material in aqueous KOH solution. The experimental results demonstrated that the Co−B particles so prepared show excellent electrochemical reversibility and considerably high charge−discharge capacity. The reversible discharge capacity of the Co−B UAAP electrode is found to exceed 300 mAh/g at a current rate 100 mA/g, similar to values for conventional hydrogen storage alloys. In addition, the cycling ability and high rate capability of the Co−B electrode are fairly good with only 10% capacity decay after 100 cycles at a high rate of 300 mA/g. These exceptional electrochemical performances are suggested to arise from the electrochemical hydrogen storage reaction on the Co−B material, which is brought about by the nanosize effects and special amorphous structure of the Co−B UAAP particles.

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Electrochemical investigations of activation and degradation of hydrogen storage alloy electrodes in sealed Ni/MH battery

Cited by 12 publications

References 10 publications

Capacity Degradation Mechanisms in Nickel/Metal Hydride Batteries

Capacity Degradation Mechanisms in Nickel/Metal Hydride Batteries

Self-discharge characteristics and performance degradation of Ni-MH batteries for storage applications

Electrochemical Hydrogen Storage Behaviors of Ultrafine Amorphous Co−B Alloy Particles

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