Preparation method for carbon aerogel composite material

Abstract

The invention discloses a preparation method for a carbon aerogel composite material. The preparation method comprises the following steps: crushing prepared oxidized graphene aerogel powder, ultrasonically treating the oxidized graphene aerogel powder, and dispersing the treated oxidized graphene aerogel powde into a phenolic resin precursor solution, thereby obtaining an oxidized graphene aerogel phenolic resin precursor solution; sealing the oxidized graphene aerogel phenolic resin precursor solution and preserving the heat for certain time, thereby preparing oxidized graphene phenolic resin wet gel; replacing water in the oxidized graphene phenolic resin wet gel and drying, thereby preparing oxidized graphene phenolic resin aerogel; thermally treating the oxidized graphene phenolic resin aerogel for simultaneously reducing oxidized graphene aerogel in the oxidized graphene phenolic resin aerogel and carbonizing phenolic resin aerogel in the oxidized graphene phenolic resin aerogel, thereby preparing graphene in-situ doped carbon aerogel; and finally, activating the in-situ doped carbon aerogel, thereby preparing the carbon aerogel composite material with high electric conductivity. The preparation method is simplified in technological process, and is convenient in controlling and regulating electrical conductivity.

Description

technical field [0001] The invention relates to the field of composite materials, more specifically, to a method for preparing a carbon airgel composite material. Background technique [0002] In 1989, Pkeala R.W. of the Lawrence Livemore National Laboratory in the United States used resorcinol and formaldehyde as raw materials to prepare organic aerogels with low density and low thermal conductivity through processes such as sol-gel and supercritical drying. Carbon aerogels were prepared by high-temperature carbonization process. Carbon airgel is an amorphous carbon material with a three-dimensional nano-network structure composed of nano-carbon particles bonded and stacked with each other. Its porosity is as high as 80 to 98%, the typical pore size is less than 50nm, and the specific surface area is as high as 600 to 3000m 2 / g, is a new type of carbon material with controllable nanopore structure and high purity, which can be widely used in electrochemical energy storage...

AI Technical Summary

Problems solved by technology

However, in the existing preparation methods of graphene airgel, the controllability of the electrical conductivity of the graphene airgel material is poor, and the preparation process is relatively complicated.

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