Method for preparing high-energy-density supercapacitor by taking oxide as template

Abstract

The invention provides a method for preparing a high-energy-density supercapacitor by taking oxide as a template. The method belongs to the technical field of supercapacitors, and comprises the steps of: mixing the oxide, polyvinylidene chloride and melamine in an organic solvent, and conducting ball milling on the mixture to obtain a precursor; placing the precursor in an oven for drying, increasing the temperature quickly under the condition of inert gas protection, and calcining the precursor at high temperature to obtain a porous mesoporous carbon material; and pickling the obtained carbon material, and then forming the capacitor by adopting the pickled carbon material and a neutral electrolyte. Tests show that the prepared supercapacitor has a very high voltage window which can be up to 1.8 v while the energy density is up to 21.5 Wh/kg<-1>.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to a method for preparing supercapacitors with high energy density using oxides as templates. Background technique [0002] Nowadays, energy has become one of the most concerned issues of all scientific researchers, so supercapacitors have entered our field of vision. Supercapacitors have many advantages, such as high power density, fast charging and discharging, and long service life. It is beneficial to the protection of the environment, among which carbon material is a good electrode material because of its good conductivity and large specific surface area. Carbon materials are used in many ways. There are many ways to synthesize porous carbon, and there are many adjustments to different structures, sizes, and shapes. However, most of the methods are cumbersome, and the amount of preparation is very small, which cannot be mass-produced industrially. There ar...

AI Technical Summary

Problems solved by technology

However, most of the methods are cumbersome, and the amount of preparation is very small, which cannot be mass-produced industrially.

There are also many kinds of carbon sources. Natural carbon materials are relatively cheap, but the purity of the synthesized samples is low.

At the same time, the main disadvantage of current supercapacitors is that the voltage window is too low and the energy density is also very low. If alkaline electrolyte is used, the maximum voltage window can reach 1.25v, which is the main aspect that limits the application of supercapacitors.

Images