Composite electrode material for supercapacitor, preparation method of composite electrode material and supercapacitor

Abstract

The invention provides a preparation method of a composite electrode material for a supercapacitor. The preparation method comprises the following steps of: 1) preparing a three-dimensional graphene oxide-hydroxyl carbon nano tube aerogel, wherein the step 1) comprises the following steps of: 1-1) preparing a graphene oxide-hydroxyl carbon nano tube dispersioin liquid; 1-2) carrying out hydrothermal reaction to obtain a three-dimensional graphene oxide-hydroxyl carbon nano tube composite gel; and 1-3) freezing and drying the composite gel to obtain the three-dimensional graphene oxide-hydroxyl carbon nano tube aerogel; 2) uniformly dispersing carbon black particles in a potassium permanganate solution to obtain a carbon black-potassium permanganate dispersion liquid; and 3) carrying out hydrothermal reaction of the three-dimensional graphene oxide-hydroxyl carbon nano tube aerogel in the carbon black-potassium permanganate dispersion liquid to obtain the composite electrode material. The invention also provides the composite electrode material for the supercapacitor and the supercapacitor.

Description

technical field [0001] The invention relates to a composite electrode material for a supercapacitor, a preparation method thereof and a supercapacitor using the electrode material. Background technique [0002] As an energy storage device with high energy density, high power density and high cycle stability, supercapacitor has attracted more and more attention. The performance of supercapacitors depends on the electrode material, which can be divided into two categories according to the energy storage mechanism: one is the electric double layer material that uses the electric double layer mechanism to store energy, such as activated carbon, activated carbon fiber, carbon nanotubes, carbon gel, etc. This material relies on electrostatic adsorption of electrolyte ions to achieve the purpose of energy storage; the second is a pseudocapacitive material that uses redox reactions between electrode materials and electrolyte ions to store energy, such as ruthenium oxide, vanadium ox...

AI Technical Summary

Problems solved by technology

Usually, however, crystals with two-dimensional structures are not stable

As a two-dimensional atomic crystal, the thin-layer structure of graphene is prone to agglomeration and stacking, which will greatly reduce the effective specific surface area of ​​graphene, making it difficult to exert the excellent characteristics of graphene itself.

Images