▎ 摘　　要

NOVELTY - Preparing carbon-based supercapacitor involves obtaining supercapacitor by the composite material composed of carbon and manganese dioxide, which is pretreating by the current collector, pulping, mixing, coating, drying, and cutting, and including the preparation of the electrode sheet and the preparation of the electrode material. The preparation of the electrode sheet involves pretreating of corroded aluminum foil current collector. The adhesive, conductive agent, and nitroxide-mediated radical polymerization (NMP) are mixed in a mass ratio of 7:3:1 to form a pulping material. A ball milling process is used for mixing, and used a planetary ball mill to grind for 2 hours. A scraper is used to scrape the grinded pulping material on the corroded aluminum foil at one time to prepare the electrode substrate. USE - Method for manufacturing a carbon-based super capacitor. ADVANTAGE - The method enables improving quality and service life of the electrode piece. DETAILED DESCRIPTION - Preparing carbon-based supercapacitor involves obtaining supercapacitor by the composite material composed of carbon and manganese dioxide, which is pretreating by the current collector, pulping, mixing, coating, drying, and cutting, and including the preparation of the electrode sheet and the preparation of the electrode material. The preparation of the electrode sheet involves pretreating of corroded aluminum foil current collector. The adhesive, conductive agent, and nitroxide-mediated radical polymerization (NMP) are mixed in a mass ratio of 7:3:1 to form a pulping material. A ball milling process is used for mixing, and used a planetary ball mill to grind for 2 hours. A scraper is used to scrape the grinded pulping material on the corroded aluminum foil at one time to prepare the electrode substrate. The electrode sheet substrate is placed in a vacuum drying oven at a pre-drying temperature of 50-60 degrees for 10-12 hours, and then placed the electrode sheet substrate in a 120 degrees high-temperature drying oven. A cutting machine is used to cut pieces of the electrode base material to make electrode pieces. The preparation of the electrode material involves using an extraction method to prepare a binary composite, mixing manganese nitrate solution, pure activated carbon, and ultrapure water together with a mass ratio of 2:2:30. The acetone is added for extraction, wash the mixture once after extraction and dried in a 60 degrees C blast drying oven, and formed the binary compound of carbon dioxide substrate and manganese dioxide. The above binary composite should be sintered under the protection of argon, the sintering time is 2 hours, and the sintering temperature is 400 degrees C. The graphene dispersion is added to the binary composite to form a ternary composite. The preparation method of the graphene dispersion involves mixing 10 g of graphene into 200 ml of NMP solution, taking 0.5 g of graphene each time, mixing into the NMP solution, keep stirring, adding 50 ml of NMP solution to the homogenizer. The graphene solution is added, during which the pressure of the chamber is continuously increased to 1300 bar, kept for 30 minutes, and the solution is taken out, and the solution is ultrasonically treated for 2 hours in ultrasound. The solution is subjected to suction filtration, filtered in a 2um filter membrane to obtain a graphene dispersion, and finally coated on the binary composite, and dried at 60 degrees in a blast drying box for 12 hours to obtain a ternary composite. The materials such as the diaphragm and the battery case are prepared, and the capacitor is assembled according to the conventional process.