Preparation method of activated carbon for making supercapacitors

Abstract

The invention relates to a preparation method of activated carbon for making supercapacitors, which comprises the following steps: by using pre-calcination petroleum coke and potassium hydroxide as raw materials, pulverizing, screening, carrying out impregnating pretreatment on the raw material, mechanically stirring, activating at high temperature, washing with water, washing with acid, and drying. The raw materials are subjected to pulverization, screening, impregnating pretreatment, mechanical stirring pre-activation, high-temperature activation and the like, so that the activation technique for preparing activated carbon from petroleum coke is effectively controlled. The ethanol-water mixed solvent impregnation technique is adopted to lower the carbon / alkali ratio to 3.5, thereby lowering the apparatus corrosion. The prepared activated carbon has centralized micropore distribution, the mesopore rate is controlled at 20-30%, and the pore size is centralized at 2nm or so, thereby being beneficial to the intercalation of the electrolyte in the pore canals. The pore structure of the product is effectively controlled, the tap density of the product is stabilized at 0.3 g / cm<3> above, and the specific capacity of the supercapacitor prepared from the activated carbon can reach 160 F / g above.

Description

technical field

[0001] The invention belongs to the technical field of preparation methods of activated carbon in material science and electrochemistry, and in particular relates to a preparation method based on the preparation of activated carbon for supercapacitors. Background technique

[0002] Supercapacitor is a new type of energy storage device, its performance is between that of battery and traditional capacitor, it has the advantages of short charging time, long service life, good temperature characteristics, energy saving and environmental protection, etc. Fields such as intermittent power supplies have broad prospects. Activated carbon has become the carbon material of choice for commercial supercapacitors due to its large specific surface area, controllable pore size, abundant and low-cost raw materials, and good stability in electrochemistry. At present, the preparation methods of activated carbon for supercapacitors are mainly physical activation method, chemic...

Images