▎ 摘　　要

NOVELTY - A storage composite material comprises cobalt-copper-silicon composite with nitrogen and sulfur co-doped graphene (I). USE - Storage composite material. ADVANTAGE - The cobalt-copper-silicon hydrogen storage alloy doped with nitrogen-sulphur co-doped graphene is capable of improving discharge capacity and cycle stability of hydrogen storage alloy. The capacity decay rate of the composite material is lower than that of the cobalt-copper-silicon hydrogen storage alloy after 50 cycles. DETAILED DESCRIPTION - A storage composite material comprises cobalt-copper-silicon composite with nitrogen and sulfur co-doped graphene, of formula: Co0.9Cu0.1Si+x wt.% NSG (I), where x is 3-10. An INDEPENDENT CLAIM is included for preparation the composite material, which involves: weighing cobalt powder, copper powder and silicon powder according to stoichiometric ratio; putting into ball milling tank under high-purity argon atmosphere; ieving to obtain cobalt-copper-silicon hydrogen-storage alloy of formula: Co0.9Cu0.1Si; ultrasonically dispersing 70 mg graphene oxide in 30 mL of deionized water to obtain a graphene oxide suspension; adding thiourea; ultrasonicating for 1-2 hours; transferring the mixed solution to reaction kettle lined with polytetrafluoroethylene; reacting at 160-180° C for 10-12 hours; uction-filtering and placing in an oven for drying; and grinding obtained nitrogen-sulfur co-doped graphene and the cobalt-copper-silicon hydrogen storage alloy for 5-10 minutes in proportion.