Preparation method for three-dimensional porous graphene for supercapacitor

A supercapacitor, three-dimensional porous technology, applied in the field of energy material graphene preparation, can solve the problems of restricting development, graphene specific surface size and surface structure, etc., to improve specific capacity and conductivity, reduce agglomeration degree, improve The effect of surface structure
CN102923698AInactive Publication Date: 2013-02-13CENT SOUTH UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CENT SOUTH UNIV
Publication Date
2013-02-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a preparation method for three-dimensional porous graphene for a supercapacitor. The preparation method comprises steps as follows: ultrasonically dispersing graphene oxide; fully mixing with a strong alkali solution; pre-drying until a surface is humidified; then activating at a vacuum environment at 120 to 180 DEG C or in protective gas atmosphere at 180 to 1200 DEG C under a high temperature; and etching the surface of the graphene to obtain a three-dimensional porous structure through high-temperature strong alkali and stream, so as to improve a specific surface area of a graphene material. According to the preparation method, activated graphene oxide is reduced through chemical reduction and high-temperature reduction methods, so as to improve a performance of activated graphene. The activated graphene and an adhesive are mixed to prepare into electrode paste based on a certain mass ratio, and the electrode paste is loaded on a conductive current collector to prepare into a supercapacitor electrode, so that a degree of agglomeration of the graphene on a pole piece can be further reduced, and a high electrochemical performance can be obtained.
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Description

technical field

[0001] The invention relates to a method for preparing graphene materials by chemical treatment, and belongs to the technical field of energy material graphene preparation. Background technique

[0002] A supercapacitor, also known as an electric double layer capacitor or an electrochemical capacitor, is composed of an electrode (Electrode), an electrolyte (Electrolyte), and a separator (Separator) composed of a current collector loaded with electrode active materials. Supercapacitors mainly form an electric double layer with opposite charges at the interface between the electrode and the electrolyte for energy storage, and its power density and energy density are between secondary batteries and traditional physical capacitors. Since the supercapacitor does not undergo electrochemical reactions during charging and discharging, the cycle life can reach 100,000 times, and it has excellent performance under high current charging and discharging. Supercapacitors...

Claims

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