A kind of supercapacitor flexible film electrode material and preparation method thereof

Abstract

The invention belongs to the technical field of electrode material preparation, and discloses a flexible film electrode material for a supercapacitor and a preparation method thereof. The preparation method is as follows: after mixing the nanocellulose and the electrode active material, they are added to the foaming liquid prepared by the surfactant to obtain a mixed slurry; then the obtained mixed slurry is foamed and formed by a foam molding process, and after drying Obtain the supercapacitor flexible film electrode material. The invention adopts foam molding process to prepare supercapacitor flexible film electrode materials by foam molding, which can fully mix nanocellulose and other electrode active substances, and can ensure the flexibility, strength and excellent electrochemical performance of electrode materials, and can be bent and folded several times After that, the internal structure of the electrode material and its specific capacity can be well maintained; after being recycled for several times, its specific capacity can still be maintained well. At the same time, the foam molding process can save a lot of fiber raw materials, water and energy consumption, and save production costs.

Description

technical field [0001] The invention belongs to the technical field of electrode material preparation, and in particular relates to a supercapacitor flexible film electrode material and a preparation method thereof. Background technique [0002] With the update and iteration of electronic products, wearable, foldable, portable and lightweight flexible electronic devices have attracted great attention. The energy storage devices corresponding to flexible electronic devices must also be flexible. In many application fields, super As a unique innovative technology, capacitors have the advantages of high power density and long cycle life, and have shown great market potential in the field of flexible electronics research. In recent years, as the research in the field of flexible electronics has become more and more in-depth, at present, most of the existing technologies for preparing flexible electrode materials use conductive substrates to provide flexibility, such as carbon fi...

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Problems solved by technology

In recent years, as the research in the field of flexible electronics has become more and more in-depth, at present, most of the existing technologies for preparing flexible electrode materials use conductive substrates to provide flexibility, such as carbon fibers, carbon cloth, carbon nanotubes and carbon nanofibers, etc., such as Murat Cakici et al. applied carbon fiber textiles as a substrate on which coral-like MnO was uniformly grown. 2 Nanomaterials, the prepared flexible supercapacitor electrodes have a high specific capacitance of 467F / g (Advanced electrochemical energy storage supercapacitors based on the flexible carbonfiber fabric-coated with uniform coral-like MnO 2 structured electrodes); Huyan Yongjiang et al. used carbon nanofibers to assemble supercapacitors with a specific capacitance of 114.6F / g (research on the influence of graphene doping on the electrochemical performance of lignin-based carbon nanofibers), and the production cost of using conductive substrates is high , not conducive to industrialization

Existing preparation techniques mostly use methods such as wet molding, vacuum filtration, magnetron sputtering, and electrochemical deposition. The chemical deposition method deposits conductive polymers or transition metal oxides on the surface of graphene films to prepare graphene-based composite films (a method for preparing graphene-based flexible supercapacitors and their electrode materials). The flexible electrode materials prepared by this process There are problems such as weak combination of active substances and substrates, uneven dispersion of raw materials, and low porosity of materials, so it is urgent to explore new methods and new processes

[0003] Foam forming process is a new paper forming technology. Foam is used as a carrier to carry fibers, so that the fibers can be well dispersed on the water-based foam, and the fibers overlap each other. By controlling the bursting of the foam, the fibers are deposited in the forming process. The web part forms a one-layer or multi-layer paper structure. At present, there are few reports on the preparation of flexible electrode materials by foam molding

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