Effect of Ni content on the structure, thermodynamic and electrochemical properties of the non-stoichiometric hydrogen storage alloys

Development of Hydrogen-Storage Alloys for High-Power Nickel-Metal Hydride Batteries

“…[11] The discharge capacity of overstoichiometric Mm(Ni 3.6 Mn 0.4 Al 0.3 Co 0.7 ) 1.12 could even release about 85.2 % capacity at a high current density of 2000 mA/g. Our former work [12] also showed that the commercial MmNi x Mn 0.4 Al 0.3 Co 0.75 with high Ni content (x > 3.55) displays superior rate capability. For example, MmNi 4.05 Mn 0.4 Al 0.3 Co 0.75 alloy can still discharge over 60 % of capacity at 3000 mA/g.…”

A macroscopic investigation to interpret the absorption and desorption of hydrogen in LaNi4.85Al0.15 alloy using the grand canonical ensemble

“…The chemical potential is obtained by the equation (27). It governs diffusive interactions as the pressure and temperature govern mechanical and thermal interactions respectively.…”

“…So, a large reduction of the enthalpy of formation contributes dramatically to improve the storage properties of hydrogen in metal hydrides [21]. Moreover, at desorption the calculated ∆H des and ∆S des data contributed to explain the decrease of hydrogen equilibrium pressure in alloys doped with Al, Mg and Bi and its increase in the Sb-doped LaNi 5 compound [26] and contributed to characterize the hydride phase stability [27].…”

Effects of annealing treatment on the microstructure and electrochemical properties of low-Co hydrogen storage alloys containing Cu and Fe

“…3 shows the activation profiles of LaNi 3.55 Mn 0.35 -Co 0.20 Al 0.20 Cu 0.75 Fe 0.10 alloy electrodes. The activation of the annealed alloy is facilitated, and the activation is retarded with the annealing temperature increasing from 1073 to 1273 K. The initial activation is usually attributed to the particle pulverization and surface reconstruction [19]. The slow activation of the annealed alloys may be due to their good homogeneity and/or small internal stain.…”