▎ 摘　　要

NOVELTY - The preparation method of graphene-coated magnesium oxide involves adding graphite oxide to deionized water, ultrasonically processing to give uniformly dispersed aqueous graphene oxide solution, adding magnesium chloride hexahydrate to graphite oxide solution, mixing resulting solution uniformly, placing resultant solution in water bath, mechanically stirring, adding ammonia solution and filtering resulting precipitate, drying to give graphene-coated magnesium oxide precursor, and sintering precursor under argon condition. USE - Preparation of graphene-coated magnesium oxide (claimed). ADVANTAGE - The method enables simple, efficient, environmentally-friendly and economical preparation of graphene-coated magnesium oxide in large-scale. DETAILED DESCRIPTION - The preparation method of graphene-coated magnesium oxide involves adding graphite oxide to deionized water, ultrasonically processing for 1-2 hours to give uniformly dispersed aqueous graphene oxide solution with concentration of 0.1-2 mg/ml, adding magnesium chloride hexahydrate with molar mass of 0.5-5 times to graphite oxide solution, mixing resulting solution uniformly for 10-30 minutes, placing resultant solution in water bath at a temperature of 30-80 degrees C, mechanically stirring at a rate of 10 rpm, dripping ammonia solution with molar concentration of 0.5-1 mol/ml into mixed solution at a rate of 0.1-10 ml/minute, adjusting pH to 9.0, and filtering resulting precipitate, drying to give graphene-coated magnesium oxide precursor, and sintering precursor under argon condition at 500-600 degrees C for 2-4 hours.