Method for manufacturing high-energy-density and high-power-density asymmetric supercapacitor based on eggshell inner membranes

Abstract

The invention discloses a method for manufacturing a high-energy-density and high-power-density asymmetric supercapacitor based on eggshell inner membranes. According to the manufacturing method, after carbonization and activating treatment in the air are carried out on one eggshell inner membrane, the eggshell inner membrane serves as negative electrode material of the supercapacitor, after carbonization and activating treatment in the strong alkaline environment are carried out on one eggshell inner membrane, MnO2 nano particles grow on the eggshell inner membrane to serve as positive electrode material of the supercapacitor, the eggshell inner membrane without treatment serves as a diaphragm, a Na2SO4 neutral solution serves as an electrolytic solution, and the asymmetric supercapacitor is assembled. The asymmetric supercapacitor based on the eggshell inner membranes has the advantages of being high in energy density, high in power density, safe to use, low in cost, environment-friendly and the like, cycling stability of the asymmetric supercapacitor reaches a usage level, and the eggshell inner membranes can be recycled as daily household garbage.

Description

technical field [0001] The invention relates to a method for manufacturing an asymmetric supercapacitor, in particular to a method for manufacturing an asymmetric supercapacitor based on an eggshell inner membrane with high energy density and high power density. Background technique [0002] With the consumption of non-renewable resources and the aggravation of environmental pollution, the demand for low-cost and environment-friendly high-power energy sources is becoming more and more urgent. Compared with batteries and ordinary capacitors, supercapacitors have the characteristics of being able to provide high power density and high energy density, but symmetrical supercapacitors cannot provide high enough energy density. Based on this asymmetric supercapacitor came into being, the asymmetric supercapacitor is mainly composed of a battery-type Faraday electrode as an energy source and a capacitive electrode as a power source. [0003] The performance of an asymmetric super...

AI Technical Summary

Problems solved by technology

However, for electric double layer capacitors, the diameter of hydrogen ions is between 0.6 and 0.76 nm, and the micropores of most activated carbons are less than 0.4 nm, so the increase in the specific capacity of activated carbon materials is limited.

In addition, the use of alkaline or acidic electrolyte is not conducive to the safe use of supercapacitors, and there may be problems such as flammability, corrosion, and inconvenient assembly in the air.

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