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

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

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...

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Veröffentlicht in:Materials 2019-12, Vol.12 (24), p.4220
Hauptverfasser: Karwowska, Malgorzata, Fijalkowski, Karol J., Czerwiński, Andrzej A.
Format: Artikel
Sprache:eng
Schlagworte:
Alkali metal alloys
Binary alloys
Corrosion
Electrode materials
Electrodes
Electrolytes
Heating
Hydrogen
Hydrogen storage
Hydrogen storage materials
Low temperature
Metal hydrides
Nickel
Rechargeable batteries
Room temperature
Sodium hydroxide
Storage batteries
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Zusammenfassung: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.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma12244220