Preparation method of graphene composite current collector

Abstract

The invention discloses a preparation method of a graphene composite current collector. The preparation method comprises the following steps of preparing a graphene oxide suspension liquid, adding a conductive polymer monomer into the graphene oxide suspension liquid for in-situ polymerization to obtain a graphene oxide / conductive polymer composite suspension liquid, adding a hydrazine hydrate solution into the graphene oxide / conductive polymer composite suspension liquid for a reaction to obtain a graphene / conductive polymer composite suspension liquid, carrying out vacuum filtration of the graphene / conductive polymer composite suspension liquid by a microporous membrane, drying the filter cake, and separating the filter cake from the microporous membrane to obtain the graphene composite current collector. According to the preparation method, the conductive polymer monomer is added into the graphene oxide suspension liquid so that a conductive polymer is formed, and the conductive polymer can be dispersed between graphene sheets well so that graphene aggregation is prevented and the graphene mixed suspension liquid having good dispersity is obtained. Compared with the traditional graphene current collector preparation method, the preparation method can realize preparation of the graphene composite current collector having good integrity and good film-forming properties.

Description

technical field

[0001] The invention relates to a preparation method of a graphene composite current collector. Background technique

[0002] Supercapacitor is a new type of energy storage device, which has the advantages of high power density (more than 10 times that of ordinary batteries), high cycle life (the number of cycles can reach more than 100,000 times), and good fast charge and discharge performance. It is widely used in Military fields, mobile communication devices, computers, and hybrid power sources for electric vehicles, etc. Generally, a supercapacitor is mainly assembled by an electrode active material layer, an electrolyte, a separator, a current collector, and a casing. The energy density of existing supercapacitors is generally relatively low. The main factors affecting the energy density of supercapacitors are the capacitance of the electrode material, the voltage of the system, and the proportion of the electrode material to the total weight of the ele...

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