Method for preparing non-symmetrical electrochemical supercapacitor and electrode materials

Abstract

The invention relates to a method for preparing a non-symmetrical electrochemical supercapacitor and electrode materials, and the method comprises the steps of crushing petroleum coke, drying, mixing with an activator according to the proportion, heating, activating, cooling, then using hydrochloric acid for washing, and further using deionized water for washing prepared activated carbon till neutral; carrying out high-temperature graphitization on the obtained activated carbon; and adopting the activated carbon and the graphitized activated carbon for producing a positive electrode and a negative electrode respectively, and finally assembling the non-symmetrical electrochemical supercapacitor. The method can improve the working voltage by 1.1V and improve the specific energy by 8.2 timesin comparison with the method of assembling an electric double-layer capacitor by adopting the pure activated carbon, and be used for producing the electrochemical supercapacitor with high specific energy, high power and long service life.

Description

technical field

[0001] The invention belongs to the fields of material science and electrochemical technology science, and in particular relates to a preparation method of an electrode material of an asymmetric electrochemical supercapacitor.

[0002] The invention also relates to a method for preparing an asymmetric electrochemical supercapacitor with the above-mentioned electrode material. Background technique

[0003] Electrochemical capacitor is a new, efficient and practical electrochemical energy storage device, which has the advantages of high power density, high energy density, long cycle life, and no pollution. It is widely used in electric / hybrid vehicles, mobile energy storage devices , industrial power management and composite power systems and other modern high-tech fields.

[0004] According to different energy storage mechanisms, electrochemical supercapacitors can be divided into:

[0005] (1) Electric double-layer capacitors, whose capacitance is mainly ba...