▎ 摘　　要

NOVELTY - Surface modification of lanthanum-magnesium-nickel-based hydrogen storage alloy by graphene, involves preparing lanthanum-magnesium-nickel-based hydrogen storage alloy using metal powder having purity of 99% based on chemical composition of AB3-type hydrogen storage alloy, under argon protection conditions, by vacuum induction melting method, pulverizing, sieving with 200-mesh sieve, mixing 95-99 wt.% lanthanum-magnesium-nickel-based hydrogen storage alloy powder with 1-5 wt.% graphene powder, and ball-milling at speed of 150-200 rpm for 0.5-1 hour, with ball-material ratio of 20:1. USE - Surface modification of lanthanum-magnesium-nickel-based hydrogen storage alloy used for preparing electrode. ADVANTAGE - The lanthanum-magnesium-nickel-based hydrogen storage alloy is surface modified with graphene, by simple process. The electrode prepared using the lanthanum-magnesium-nickel-based hydrogen storage alloy, has excellent cycle performance and corrosion resistance. DETAILED DESCRIPTION - Surface modification of lanthanum-magnesium-nickel-based (AB3-type) hydrogen storage alloy by graphene, involves preparing lanthanum-magnesium-nickel-based hydrogen storage alloy (La0.73Ce0.18Mg0.09Ni3.20Al0.21Mn0.10Co0.60) using metal powder having purity of 99% based on chemical composition of AB3-type hydrogen storage alloy, under argon protection conditions, by vacuum induction melting method, pulverizing, sieving with 200-mesh sieve, mixing 95-99 wt.% lanthanum-magnesium-nickel-based hydrogen storage alloy powder with 1-5 wt.% graphene powder, and ball-milling at speed of 150-200 rpm for 0.5-1 hour, with ball-material ratio of 20:1. The graphene powder is prepared by adding 10 g graphite powder to 250-300 mL sulfuric acid with concentration of 98 %mass, stirring for 30 minutes in an ice-water bath, adding 40 g potassium permanganate, stirring for 1 hour, adding resultant mixture to a water bath at 40 degrees C, stirring for 30 minutes, diluting resultant mixture to 900 mL with distilled water, adding 50-60 mL hydrogen peroxide with concentration of 30 %mass, filtering when hot, repeatedly washing the filtrate with 5 %mass hydrochloric acid and deionized water until the filtrate is neutral, and drying at 50 degrees C, obtaining graphite oxide, adding 200 mL distilled water to 0.5 g graphite oxide, ultrasonically processing for 3 hours, adding 5-8 g sodium borohydride at 80 degrees C, precipitating, repeatedly washing the precipitate with absolute ethanol and deionized water, and drying.