Effect of electrolyte concentration on the electrochemical properties of an AB5-type alloy for Ni/MH batteries

Ruiz, Fabricio; Martínez, Paula; Castro, E.B.; Humana, Rita Mariangeles; Peretti, H.A.; Visintín, Arnaldo

doi:10.1016/j.ijhydene.2012.10.007

Cited by 27 publications

(16 citation statements)

References 17 publications

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“…A 30% KOH solution is widely used as the electrolyte for Ni/MH batteries due to the balance of conductivity and freezing point temperature. Performance comparisons for other concentrations [20] and alkaline metal hydroxides [21] are available. A small amount of LiOH (1.5 g•L −1 ), which has higher chemical reactivity, is added to boost low-temperature performance, while in hightemperature applications, part or all of the KOH is replaced by the less reactive (corrosive) NaOH to reduce corrosion.…”

Section: Basic Structure Of Nickel/metal Hydride Batterymentioning

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: Basic Structure Of Nickel/metal Hydride Batterymentioning

confidence: 99%

Capacity Degradation Mechanisms in Nickel/Metal Hydride Batteries

Kim

Yasuoka

2016

Batteries

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“…Figure 5 shows the influence of electrolyte concentration on the discharge capacity of the perovskite-type electrode at 298 K. Interestingly, the discharge capacity of the electrode increases monotonously with the increase of the KOH concentration. This behavior is remarkably different from that of conventional intermetallic alloys in which higher electrolyte concentration is harmful for their electrochemical performance [27]. In intermetallic alloys, the accentuated corrosion of the alloy in highly concentrated KOH electrolyte promotes degradation of the discharge capacity.…”

Section: Electrochemical Characterizationmentioning

confidence: 82%

Electrochemical performance of the rare-earth perovskite-type oxide La0.6Sr0.4Co0.2Fe0.8O3 as negative electrode material for Ni/oxide rechargeable batteries

Henao

Sotelo

Casales

et al. 2017

Mater Renew Sustain Energy

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In this paper, the perovskite-type oxide La 0.6-Sr 0.4 Co 0.2 Fe 0.8 O 3 was evaluated as a novel negative electrode material for Ni/oxide rechargeable batteries. The structure and morphology of the as-prepared powder was studied by scanning electron microscopy and X-ray diffraction. The electrochemical performance of the perovskite-type oxide was investigated using chronopotentiometric, chronoamperometric and potentiodynamic polarization techniques. The maximum discharge capacity values of the perovskite-type electrodes were obtained during the first three cycles (51, 172 and 462 mAh g -1 at 298, 313 and 333 K, respectively). The maximum adsorption capability of hydrogen in the perovskite-type electrode was 1.72% wt. hydrogen at a current rate of 125 mA g -1 , 333 K and 6 M KOH. The cycling ability was fairly good with 64% capacity conservation after 20 cycles at 333 K. The electrochemical evaluation was also performed using different electrolyte concentrations; interestingly, the maximum discharge capacity of the perovskite-type electrodes increased in a linear-like manner with the incremental changes in electrolyte concentration. The hydrogen diffusion coefficient and exchange current density were also estimated to discuss the kinetics of the process.

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“…Apparently, 6M KOH solution, considered to be the most appropriate solvent for Ni-MH batteries under ambient conditions [1,41], balancing positive aspect of high ionic conductivity of concentrated electrolyte with relatively low degradation of an alloy, does not behave optimally in low temperature ranges. However, the stability of the investigated alloy remained very good, with the full electrochemical capacity of the alloy recovered in a reference measurement when the system was reheated to room temperature after the low temperature tests.…”

Section: Low Temperature Performance Of the Alloy In 6m Single Cationmentioning

confidence: 99%

Low Temperature Characteristics of Hydrogen Storage Alloy LaMm-Ni4.1Al0.3Mn0.4Co0.45 for Ni-MH Batteries

2019

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Nickel hydride batteries (Ni-MH) are known of their good performance and high reliability at temperatures below 0 °C, which is significantly dependent on electrolyte composition. Here we present the low temperature characteristics of pristine AB5-type alloy, LaMm-Ni4.1Al0.3Mn0.4Co0.45, determined in various alkali metal hydroxide solutions. We found that the combination of KOH with NaOH showed a significant effect of enhancement of low temperature performance of the electrode material and diffusion of hydrogen in the alloy. This 6M binary mixed NaOH/KOH electrolyte, comprising 4M KOH component and 2M NaOH component, made it possible to maintain 81.7% and 61.0% of maximum capacity at −20 °C and −30 °C, respectively, enhancing the hydrogen storage properties of the alloy after reheating to room temperature.

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Effect of electrolyte concentration on the electrochemical properties of an AB5-type alloy for Ni/MH batteries

Cited by 27 publications

References 17 publications

Capacity Degradation Mechanisms in Nickel/Metal Hydride Batteries

Capacity Degradation Mechanisms in Nickel/Metal Hydride Batteries

Electrochemical performance of the rare-earth perovskite-type oxide La0.6Sr0.4Co0.2Fe0.8O3 as negative electrode material for Ni/oxide rechargeable batteries

Low Temperature Characteristics of Hydrogen Storage Alloy LaMm-Ni4.1Al0.3Mn0.4Co0.45 for Ni-MH Batteries

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