▎ 摘　　要

NOVELTY - Preparing carbon-based composite electrode material involves dissolving phenol and formaldehyde in volume ratio of 0.9-1.1:2.5-4.5 0.3-0.6 molar sodium hydroxide solution. The solution is heated to 65-75 degrees C for 0.4-0.7 hours to obtain the oligomeric phenolic resin resol. Concentrated sulfuric acid is added into the mixture of sodium nitrate and graphite under ice water bath condition. The mixture is stirred for 10-60 minutes to obtain the first mixture. The concentration of the concentrated sulfuric acid is 95-98%. USE - Method for preparing carbon-based composite electrode material used in super capacitors (claimed). ADVANTAGE - The method enables to prepare carbon-based composite electrode material which has high specific surface area, large pore volume, high specific capacity, excellent rate capacity and excellent cyclical stability. The method is is simple, feasible, cost effective and easy for industrial production. DETAILED DESCRIPTION - Preparing carbon-based composite electrode material involves dissolving phenol and formaldehyde in volume ratio of 0.9-1.1:2.5-4.5 0.3-0.6 molar sodium hydroxide solution. The solution is heated to 65-75 degrees C for 0.4-0.7 hours to obtain the oligomeric phenolic resin resol. Concentrated sulfuric acid is added into the mixture of sodium nitrate and graphite under ice water bath condition. The mixture is stirred for 10-60 minutes to obtain the first mixture. The concentration of the concentrated sulfuric acid is 95-98%. Sodium nitrate and graphite are mixed in weight volume ratio of 90-300:0.5-5.5:2.2. The first mixture is added with potassium permanganate in batches and allowed to react for 12-48 hours to obtain the second mixture. Graphite and potassium permanganate are mixed in weight ratio of 0.5-5.5:5-25. The second mixture is mixed with de-ionized water with stirring for 30-60 minutes and then heated to 97-99 degrees C for 45-55 hours to obtain the rough product of oxidized graphite alkene which is treated with 35% hydrogen peroxide solution for 30-60 minutes. The resulting solution is filtered and the residue is washed and dried to obtain graphene oxide. Potassium permanganate and deionized water are mixed in weight volume ratio of 5-25:25-350. Deionized water and hydrogen peroxide are mixed in volume ratio of 25-350:50-100. The obtained graphene oxide is ultrasonically dispersed in deionized water to obtain 1-10 mg/ml of graphene oxide dispersion liquid. The oligomeric phenolic resin resol is mixed with triblock copolymer P123 and F127 and the mixture is heated to 65-75 degrees C with stirring for 2.5-4 hours then cooled down to room temperature to obtain the third mixture. The oligomeric phenolic resin resol is mixed with triblock copolymer P123 and F127 in weight ratio of 0.9-1.1:0.75-0.85:1.25-1.15. The solution is filtered to obtain the graphene oxide dispersion of block material which is hydrothermally heated to 150-200 degrees C for 15-30 hours and then cooled down to room temperature to obtain multi-stage carbon-based composite electrode material.