Phase transformation of the La0.7Mg0.3Ni2.8Co0.5-H2 system studied by in situ X-ray diffraction

Effects of Mo additive on the structure and electrochemical properties of low-temperature AB5 metal hydride alloys

“…Recently, AB 2 [1][2][3][4][5][6][7][8], AB 3 [9][10][11], and AB 5 [12][13][14][15], and BCC [16,17] metal hydride (MH) alloys have been intensively investigated to improve the performance of nickel metal hydride (Ni/MH) batteries. In one direction of compositional modification, molybdenum was found to be beneficial to the low-temperature applications of Ni/MH batteries [18][19][20][21].…”

Effect of Magnesium on the Crystal Transformation and Electrochemical Properties of A2B7-Type Metal Hydride Alloys

“…Within the Mg concentration range of the existence of 2H-and 3R-type (La,Mg) 2 Ni 7 phases, the H/M of the two allotropes are similar about 0.93. The P-C isotherms show that the alloys with (La,Mg) 2 Ni 7 phase show one plateau and similar H/M values, stating similar discharge behavior of the 2H-and 3R-type phases 3. …”

“…[1][2][3][4][5] As the battery cathode materials, the commercialized AB 5 -type alloys, however, are subjected to low discharge capacity, restricting the development of MH/Ni batteries. 6,7 Recently, La-Mg-Ni-based hydrogen storage alloys with AB 3 -type or A 2 B 7 -type superlattice structures have been on focus for their higher discharge capacities than AB 5 -type alloys (reaching to 410 mAh g −1 , 30% superior compared to that of the AB 5 -type alloy electrodes), especially the A 2 B 7 -type La-Mg-Ni-based alloys of which studies have shown that their cycling stabilities are superior than that of AB 3 -type alloys.…”

Effects of B, Fe, Gd, Mg, and C on the structure, hydrogen storage, and electrochemical properties of vanadium-free AB2 metal hydride alloy

“…Magnesium-incorporation in MH alloys is essential for stabilizing AB 3 and A 2 B 7 crystal structures [28][29][30][31][32][33][34][35][36][37][38][39]. Partial replacement of rare earth metals with Mg can adjust the metal-hydrogen bond strength to appropriate levels for room temperature battery applications.…”