Preparation method of foamed electrode sheet

Abstract

The invention discloses a preparation method of a foamed electrode sheet. The method comprises the following steps that: 1) graphite oxide and polyacrylonitrile are added into a planetary ball mill soas to be ground, and a ground mixture is added to 75% of ethanol so as to be subjected to ultrasonic dispersion, so that a suspension liquid can be formed; 2) foamed nickel is soaked in the above suspension liquid, after removal is performed, a solvent is evaporated to dryness, an obtained product is arranged into a muffle furnace protected by a mixture of hydrogen and nitrogen, so that the obtained product can undergo a reaction in the muffle furnace, after the reaction is carried out completely, natural cooling is performed; 3) a newly obtained product is immersed in 70% of hydrochloric acid so as to be subjected to a reaction, after the reaction is carried out completely, foamed graphene is obtained; and 4) carbon aerogel and nano carbon fibers in a ratio of 1: (0.3 to 3) are added toabsolute ethyl alcohol, ultrasonic treatment is performed, so that a suspension liquid can be formed, and the suspension liquid coats the foamed graphene, and the foamed graphene coated with the suspension liquid is dried, cooled and rolled, so that the electrode sheet can be obtained. According to the foamed electrode sheet prepared by using the preparation method of the invention, graphene stacking can be avoided; and the foamed electrode sheet has high specific surface area and high conductivity. With the preparation method adopted, preparation processes can be simplified, and costs can bereduced.

Description

technical field [0001] The invention relates to the technical field of foam electrodes. Background technique [0002] Graphene is a carbon atom with sp 2 The honeycomb planar film formed by hybridization is a quasi-two-dimensional material with only one atomic layer thickness, so it is also called single atomic layer graphite. Andre Geim and Konstantin Novoselov, physicists at the University of Manchester in the United Kingdom, successfully separated graphene from graphite by micromechanical exfoliation, so they jointly won the 2010 Nobel Prize in Physics. The common powder production methods of graphene are mechanical exfoliation method, redox method, and SiC epitaxial growth method, and the film production method is chemical vapor deposition (CVD). Due to its very good strength, flexibility, electrical conductivity, thermal conductivity, and optical properties, it has been greatly developed in the fields of physics, materials science, electronic information, computers, a...

AI Technical Summary

Problems solved by technology

However, graphene is prone to stacking during the preparation process, which affects the dispersion and surface wettability of graphene materials in electrolytes, and reduces the effective specific surface area and electrical conductivity of graphene materials.