Mechanically alloyed MmNi5-type materials for metal hydride electrodes

Microstructural evolution during mechanical alloying of Mg and Ni

“…However, it is now possible to avoid the inherent difficulties of the fusion technique by using mechanical alloying [3,[12][13][14]. This is so because the reaction between Mg and Ni takes place in solid state and, more importantly, the compound obtained possesses microstructural characteristics such as nanocrystallinity [4,15,16] that are more suitable for hydrogen absorption [17][18][19].…”

Effect of substitution of Mm for La on the electrochemical properties of the LaNi3.55Mn0.4Al0.3Co0.75 compound

“…Researches dealing with hydride forming intermetallics, such as AB n (A, rare earth or transition element; B, transition element; n = 5, 2 or 1) [1], are very developed nowadays because of the wide application for the rechargeable nickel-metal hydride (Ni-MH x ) batteries. Compared to the conventional lead acid and nickel cadmium batteries, the Ni-MH battery has many advantages [1,2].…”

Study and characterization of a metal hydride container

“…By comparing the discharge volumes determined after the first successive charge/discharge cycles, we considered that the alloy became activated after the first cycle, in accordance with the claim that AB 5 alloys activate easily [2]. The determined PCT curve under desorption at 23 1C is depicted in Fig.…”

“…The material selected to fill the container is [2], decrease the capacity and lower down the equilibrium pressure [3,4]. However, the presence of Ce tends to raise the equilibrium pressure, allowing the tailoring of the alloy to the desired working conditions.…”