Graphene-based flexile self-support mixed gel electrode and preparation method thereof

Abstract

The invention relates to a graphene-based flexile self-support mixed gel electrode and a preparation method thereof. In preparation, graphene oxide is reduced by adopting a hydrothermal method firstlyto obtain a graphene dispersion liquid; next, an active material and the graphene dispersion liquid are mixed uniformly to obtain a mixed dispersion object; and finally, the mixed dispersion object is subjected to suction filtration and washing to obtain the graphene-based flexile self-support mixed gel electrode. Compared with the prior art, graphene is adopted in the invention to replace a conductive agent, a binder and a current collector in the conventional electrode, so that the a self-support mixed gel electrode thin film with high flexibility is obtained; and the electrode has excellent specific capacity and rate capability, can be applicable to multiple active materials and solution systems, and has relatively high application prospect in the fields of a battery, a supercapacitorand other energy storage systems or other functional composite materials.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy storage, and relates to a graphene-based flexible self-supporting hybrid gel electrode and a preparation method thereof. Background technique [0002] Electrodes are crucial to the performance of energy storage devices. The active materials of traditional electrodes are basically in the form of powder or dispersed liquid. When preparing traditional electrodes, the active materials are mixed with conductive agents and binders to form a slurry and coated on On the current collector, an electrode can be formed. However, since the binder is a polymer, the presence of these polymer binders will affect the electronic conductivity and impair the electrochemical performance of the active material; the current collector usually requires the use of expensive metal thin films. Therefore, in traditional electrodes, the addition of conductive agents, binders, and current collectors will not onl...

AI Technical Summary

Problems solved by technology

However, since the binder is a polymer, the presence of these polymer binders will affect the electronic conductivity and impair the electrochemical performance of the active material; the current collector usually requires the use of expensive metal thin films

Therefore, in traditional electrodes, the addition of conductive agents, binders, and current collectors will not only increase additional costs and damage the performance of active materials, but also occupy too much mass and volume, which greatly limits the energy density of energy storage devices.

In addition, these traditional electrodes prepared by the slurry coating method also have great deficiencies in flexibility, and it is difficult to meet the needs of wearable devices for flexible electrodes.

However, the existing flexible electrodes are usually prepared by loading nanoscale active materials on flexible conductive current collectors, which are expensive, difficult to produce and apply on a large scale, and are not compatible with commercial active materials such as activated carbon or lithium iron phosphate.

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