The role of Mn in C14 Laves phase multi-component alloys for NiMH battery application

Studies on Incorporation of Mg in Zr-Based AB2 Metal Hydride Alloys

“…The slope factor (SF) indicates the degree of disorder (DOD) in an alloy. SF is defined as the ratio of the storage capacity between 0.01 MPa and 0.5 MPa to the total capacity in the desorption isotherm [2,19,51]. An alloy with a large SF has a flatter plateau and less DOD (less components or less variations among the components).…”

“…Its reversible hydrogen storage capacity can be as high as 3 wt% [1], which is equivalent to an electrochemical capacity of 804 mAh¨g´1. The measured electrochemical discharge capacity can reach up to 436 mAh¨g´1 [2], which is about 25% higher than the conventional AB 5 MH alloys based on rare earth metals (330 mAh¨g´1) [3,4]. Early in their development, AB 2 MH alloys suffered from a harder activation and a shorter cycle life when compared to AB 5 MH alloys [5][6][7][8].…”

Stoichiometry in Inter-Metallic Compounds for Hydrogen Storage Applications

“…First, the hydrogen storage characteristics and other important features of the IMC will be reviewed and then there will be a discussion of the AB 5 , AB 2 , A 2 B 7 , and AB metal hydride (MH) alloy systems with variations in stoichiometry. The experiments that provide the basis for this chapter's discussion are described in detail (experimental set-up and chosen parameters) in earlier publications (Young, et al, 2008(Young, et al, , 2009a(Young, et al, , 2010a.…”

Substitution effects on the hydrogen storage behavior of AB2 alloys by first principles

“…By mechanically alloying with the catalytic element like Pd or Ni, the thermodynamic properties, activation process and the hydriding/dehydriding kinetic of TiFe systems have been substantially modified [24][25][26], similar to the behavior observed in the Mg 2 Ni-based compounds [27][28][29][30]. For the AB 2 -based systems, substitution of both A-type and B-type elements leads to the great improvements in the activation process, hydrogen storage capacity, thermodynamic properties and charging/discharging kinetics [31][32][33][34][35][36]. For instance, Mani et al reported that partial substitution of B-type transition elements (M =V, Cr, and Al) in ZrMnFe 0.5 Ni 0.5 and ZrMnFe 0.5 Co 0.5 systems has significant effects on the lattice parameter, hydrogen storage properties including plateau pressure, plateau slope, and thermodynamic, etc.…”