▎ 摘　　要

NOVELTY - Preparation of coated nitrogen-doped graphene ternary material by taking ternary material precursor and lithium source, grinding, and mixing uniformly to obtain sample; adding volatile solvent to sample to obtain second sample; adding second sample, blending in volatile solvent, and ball milling to obtain third sample; stirring third sample, and oven-drying at 80-100 degrees C for 6-10 hours to obtain dried sample; and putting dried sample to tubular furnace, introducing air or argon gas in tube furnace, heating tubular furnace uniformly, heating, and calcining to obtain ternary material. USE - Method for preparing coated nitrogen-doped graphene ternary material used as battery material (claimed). ADVANTAGE - The capacity retention rate is 3.54%. The synthesized coated nitrogen-doped graphene material has excellent cycle stability, and higher cycle capacity. The preparation has simple operation, and low cost. The material is suitable for industrial production, and environment-friendly. DETAILED DESCRIPTION - Preparation of coated nitrogen-doped graphene ternary material comprises taking ternary material precursor and lithium source, grinding, and mixing uniformly to obtain sample; adding volatile solvent to sample to obtain second sample; adding second sample, blending in volatile solvent, and ball milling to obtain third sample; stirring third sample, and oven-drying at 80-100 degrees C for 6-10 hours to obtain dried sample; putting dried sample to tubular furnace, introducing air or argon gas in tube furnace, heating tubular furnace uniformly, heating, and calcining to obtain ternary material; mixing graphene oxide to ternary material, adding water to dilute, and cell crushing to obtain prepared sample; and crushing sample, putting in tubular furnace, introducing ammonia gas, heating uniformly, calcining to obtain coated material of nitrogen-doped graphene, using ammonia gas, nitrogen-doping, and coating ternary material on graphene.