▎ 摘　　要

NOVELTY - Rare-earth-magnesium-nickel-based alloy is designed. The designed alloy is placed in copper crucible and smelted in high-frequency furnace, the resulting alloy is heat-treated at 800-1000 degrees C for 4-24 hours under degree of vacuum of 1x 102 Pa in argon atmosphere to obtain A2B7 main phase alloy. The resulting alloy is subjected to mechanical milling in inert gas, and graphene is added to obtain superlattice-type rare-earth-magnesium-nickel-based hydrogen storage alloy. USE - Preparation of superlattice-type rare-earth-magnesium-nickel-based hydrogen storage alloy (claimed). ADVANTAGE - The method provides superlattice-type rare-earth-magnesium-nickel-based hydrogen storage alloy having high electrochemical capacity, excellent activation property, and durability. DETAILED DESCRIPTION - Rare-earth-magnesium-nickel-based alloy of formula: (RExMgy)(NikCoaAlbMnc)n is designed, where x is 0.6-0.7, n is 3-4, k+a+b+c is 1, a is 0.1-0.2, b is 0.01-0.1, c is 0-0.1, z is 8 or less, x+y is 1, k+a+b+c is 1, and RE is rare-earth element. The designed alloy is placed in copper crucible and smelted in high-frequency furnace, the resulting alloy is heat-treated at 800-1000 degrees C for 4-24 hours under degree of vacuum of 1x 102 Pa in argon atmosphere to obtain A2B7 main phase alloy. The resulting alloy is subjected to mechanical milling in inert gas, and graphene is added to obtain superlattice-type rare-earth-magnesium-nickel-based hydrogen storage alloy.