Low Temperature Characteristics of Hydrogen Storage Alloy LaMm-Ni(4.1)Al(0.3)Mn(0.4)Co(0.45) 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-Ni(4.1)Al(0.3)Mn(0.4)Co(0.45), deter...

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Detalles Bibliográficos
Autores principales: Karwowska, Malgorzata, Fijalkowski, Karol J., Czerwiński, Andrzej A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6947314/
https://www.ncbi.nlm.nih.gov/pubmed/31888168
http://dx.doi.org/10.3390/ma12244220
Descripción
Sumario: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-Ni(4.1)Al(0.3)Mn(0.4)Co(0.45), 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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