Structure and electrochemical properties of La2−xMgxNi7.0 (x=0.3–0.6) hydrogen storage alloys

Hydrogen diffusion behavior in α-solid solution phase of LmNi3.55Co0.75Mn0.4Al0.3 metal hydride electrode—Effect of temperature

“…Specifically, AB 5 -type hydrogen storage intermetallic compounds based on substitution derivatives of LaNi 5 have been predominantly used in Ni/MH batteries as negative electrodes because of their better overall electrochemical properties compared to other metal hydrides [1,[4][5][6][7].…”

Hydrogenation and electrochemical studies of La–Mg–Ni alloys

“…Diffraction peaks shifted toward higher angles with increasing Mg-content due to the decrease of the unit-cell volume induced by the Mg-substitution. Slight decrease of lattice constant is caused by smaller atomic size of Mg than La [10,11]. It is important to note, that normally, decrease of cell volume causes deterioration of hydrogen sorption properties which is not observed in our work (shown below).…”

“…These oxides hinder the hydrogen atoms from diffusion in or out in alkaline solutions [13]. Another reason can be expansion and contraction of cell volume in the process of hydrogenation and dehydrogenation leading to the pulverization of alloy particles [11]. Moreover, after electrochemical measurements we found a part of material at the bottom of H-type shape i n t e r n a t i o n a l j o u r n a l o f h y d r o g e n e n e r g y x x x ( 2 0 1 6 ) 1 e8 glass cell.…”

Study on the phase structures and electrochemical performances of La0.6Gd0.2Mg0.2Ni3.15-xCo0.25Al0.1Mnx (x = 0-0.3) alloys as negative electrode material for nickel/metal hydride batteries

“…Generally speaking, two important factors lead to the discharge capacity degradation of metal-hydride electrodes: the surface oxidation/corrosion and the pulverization of alloy particles [18,19]. For La-Mg-Ni-based hydrogen storage alloys, Mg is an key element to improve the overall electrochemical performance of the hydrogen storage alloys [20][21][22]. The discharge capacity and the cyclic stability of La-Mg-Ni-based alloy electrodes are sensitive to Mg content whereas Mg is easily oxidized and then partly dissolved in the alkaline electrolyte which can cause the loss of active component and deteriorate cycle life of the alloy electrodes.…”