Highlighting the stability control of superlattice structures by fine tuning of subunit volumes

ABy compounds with superlattice structures are considered as new generation materials for hydrogen storage and very promising negative electrode Ni-MH batteries. These can be the stacking of two fundamental layers along c crystallographic axis: [A2B4] [AB5]. Binary RNix (R = rare earths) adopting absorb large quantity but show poor reversibility. The built by constraining ab planes subunit to that more stable [AB5] one. volume mismatch between subunits is main cause multi-plateau behavior binary compounds. multi-element often improved properties. In this review we highlight structural evolution element substitution correlation matches hydrogenation