Influence of Ce and Nd contents of Ml(NiCoMnAl)5 alloy on the performances of Ni–MH batteries

Guo, Jiaqi; Jiang, Zhongmin; Duan, Qing; Liu, G.Z; Zhang, J.H; Xia, Chen; Guo, Sheng

doi:10.1016/s0925-8388(99)00364-3

Cited by 8 publications

(1 citation statement)

References 6 publications

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“…The effects of the replacement on both A and B sides on the performances, the discharge capacity, cycle life, etc., of the alloy electrodes have been extensively investigated by many researchers. [2][3][4][5][6][7][8][9][10][11] The partial substitution of Ni by Co in many alloys increases the thermodynamic stability of the hydride phase as well as its corrosion resistance, providing a long cycle life. 12,13 The effects have been attributed to a diminution in the volume changes upon hydrogen absorption and desorption and to a surface passivation mechanism (i.e., oxide formation) and a smaller stress-cracking phenomenon due to a lowering of the Vickers hardness.…”

Section: Introductionmentioning

confidence: 99%

Effect of partial substitution of nickel by tin, aluminum, manganese and palladium on the properties of LaNi5-type metal hydride alloys

Souza¹,

Ticianelli²

2003

J. Braz. Chem. Soc.

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Neste trabalho é feito um estudo do comportamento eletroquímico de eletrodos formados por pó de ligas de hidreto metálico do tipo AB 5 com formulações LaNi (5-x) Z x , onde Z é um elemento metálico que substitui parcialmente o Ni, que inclui Sn, Al, Mn e Pd. No caso do Mn, algumas estruturas do tipo AB 6 são também consideradas. A substituição de uma pequena fração do Ni pelo Al, Sn e Mn (x ≅ 0.3) promove um aumento da capacidade de armazenamento de hidrogênio (CAH), enquanto que o Pd leva à um decréscimo desta propriedade. Em geral todas as ligas apresentam alta CAH inicial, mas exibem baixa estabilidade. Foi observado que a diminuição da pressão de equilíbrio de hidrogênio em função do teor de Mn, nas ligas AB 5 , relaciona-se diretamente com o aumento do volume da cela cristalina unitária. Através de experimentos de impedância eletroquímica nota-se um aumento significativo da cinética de reação de hidretação/desidretação com o aumento do número de ciclos de carga/descarga do eletrodo, devido ao aumento da área ativa. Também foi observado que, no geral, as ligas que apresentam maior CAH são aquelas que possuem menor energia de ativação para a reação de oxidação de hidrogênio.This work reports studies on the electrochemical behavior of AB 5 -type hydrogen storage alloys, formed by LaNi (5-x) Z x , where Z is a metallic element partially replacing Ni, which included Sn, Al, Mn, and Pd. In the case of Mn, some AB 6 -type structures were also considered. Substitution of a small fraction of Ni by Al, Sn, and Mn (x ≅ 0.3) leads to an increase of the hydrogen storage capability (HSC), while for Pd there is a decrease of this property. Generally all alloys presenting larger initial HSC exhibit lower stability. A decrease of the hydrogen equilibrium pressure as a function of Mn content is observed for the AB 5 alloys and this is related to an increase of the crystalline unit cell volume. Electrochemical impedance measurements show a significant increase of the hydration/dehydration reaction kinetics due to a raise on the active area as a function of the charge/discharge cycle number. It is also seen that the alloys presenting larger HSC are those showing smaller activation energies for the hydrogen oxidation reaction.Keywords: hydrogen storage materials, electrode materials, energy storage materials, nickelmetal hydride battery IntroductionThe use of metal-hydride (MH) alloys as negative electrode material in rechargeable alkaline batteries has grown in recent years, because of its high energy density, high rate capability, and environmental acceptability. Ni-MH batteries have been developed and commercialized to meet a strong market demand as a power source with a high performance/cost ratio. 1,2 Currently, the anodes of most Ni-MH batteries are based on the AB 5 family of intermetallic compounds. To improve the electrode performance and lower costs of hydrogen storage alloys, AB 5 type alloys have been developed with substitution of pure earth elements in A side (La) by a mischmetal-based multicomponent and the parti...

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Section: Introductionmentioning

confidence: 99%

Effect of partial substitution of nickel by tin, aluminum, manganese and palladium on the properties of LaNi5-type metal hydride alloys

Souza¹,

Ticianelli²

2003

J. Braz. Chem. Soc.

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Effect of al on behavior of AB5-type metal hydride anodes at elevated temperature

Fang

Zhang

et al. 2000

J. of Shanghai Univ.

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ABs-type hydrogen storage alloys are the most promising materials used as the anode in commercial Ni-MH secondary battery. It is very important for electrode materials to have a wider operation temperature range. The component AI is the dominant element to control the electrochemical behavior of the ABs-type alloys at elevated temperature. With the increase of the amount of AI the discharge capacity decreases and the retention of discharge capacity increases with increasing temperature. It is mainly due to the formation of stable and dense surface oxide film A1203, which inhibits the electrode corrosion and the further oxidation underneath the surface films.

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Alkaline Fuel Cells, Theory and Applications

Ferriday

Middleton

2022

Comprehensive Renewable Energy

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Influence of Ce and Nd contents of Ml(NiCoMnAl)5 alloy on the performances of Ni–MH batteries

Cited by 8 publications

References 6 publications

Effect of partial substitution of nickel by tin, aluminum, manganese and palladium on the properties of LaNi5-type metal hydride alloys

Effect of partial substitution of nickel by tin, aluminum, manganese and palladium on the properties of LaNi5-type metal hydride alloys

Effect of al on behavior of AB5-type metal hydride anodes at elevated temperature

Alkaline Fuel Cells, Theory and Applications

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