Effect of the stoichiometric ratio on electrochemical properties of hydrogen storage alloys for nickel-metal hydride batteries

Structural and electrochemical characterization of a melt spun AB5-type alloy

“…This results in a lower discharge capacity for a lower unit cell volume. Similar trends have been reported earlier [38,[40][41][42]. Ye et al [40] observed Fig.…”

“…Ye et al [40] observed a decrease in the discharge capacity at low discharge currents, when the cell parameters decreased and the plateau pressure increased for over-stoichiometric AB 5 materials. Fukumoto et al [41] and Shu et al [42] also observed that the discharge capacity decreased when the unit cell volume decreased for over-stoichiometric alloy compositions. However, Rozdzynska-Kielbik et al [38] found that the unit cell volume increased, while the equilibrium plateau pressure and the hydrogen content decreased with increasing zinc content in LaNi 5−x Zn x .…”

“…This was explained by a decrease in the interstitial space and position for storing hydrogen as the cell parameters decrease [40]. For non-stoichiometric alloy compositions, Fukumoto et al [41] and Shu et al [42] also observed that Fig. 7.…”

Effect of ball-milling time on the electrochemical properties of La–Mg–Ni-based hydrogen storage composite alloys

“…Therefore, the Ni content exposed at the composite surface was increased with increasing ball-milling time. It is well known that, for hydrogen storage alloys, Ni element possesses good electrocatalytic activity and good electron conductibility [31,33,34], which results in the improvement of electrode kinetics. In addition, there may be the intrinsic synergetic effect between two alloys in composite electrode, which will account for the improvements of electrochemical kinetics.…”

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

“…Fukumoto et al reported that high-rate dischargeability and electrocatalytic activity for the hydrogen evolution reaction at the Mm(Ni 3.6 Mn 0.4 Al 0.3 Co 0.7 ) x (0.88 £ x £ 1.12) electrodes were improved by increasing x. [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.…”