Method for preparing carbon aerogel by utilizing normal-pressure drying

Abstract

The invention belongs to the technical field of preparation of carbon aerogel, and specifically relates to a method for preparing carbon aerogel by using normal-pressure drying. The preparation methodcomprises the following steps: introducing a reinforcing agent into a reaction monomer and catalyst system, preparing wet gel by using a sol-gel method, carrying out aging treatment on the wet gel, replacing moisture in the wet gel by using a low-surface-tension solvent, putting the wet gel into air, carrying out normal-pressure drying to obtain organic aerogel, and carbonizing the organic aerogel to obtain carbon aerogel, wherein the reaction monomers are resorcinol and formaldehyde, and the reinforcing agent is high-molecular polymer F127; according to the method disclosed by the invention,complex processes of a conventional supercritical drying method and a freeze drying method are avoided, meanwhile, the shrinkage rate of the carbon aerogel material in a normal-pressure drying process is greatly reduced, and the supercapacitor electrode material with excellent performance can be obtained at a low price.

Description

technical field [0001] The invention belongs to the technical field of carbon aerogel preparation, and in particular relates to a method for preparing carbon aerogel by normal pressure drying. Background technique [0002] As a new type of energy storage device, supercapacitors have many advantages of traditional capacitors and batteries, which can be summarized as follows: (1) Ultra-high capacitance, with a capacity of several Farads or even thousands of Farads; (2) Leakage current Very small, with voltage memory function, long voltage retention time; (3) high power density; (4) long cycle life, charge and discharge times greater than 100,000 times; (5) long-term storage without failure; (6) operating temperature range (7) Electrode materials do not use polluting substances and are environmentally friendly; supercapacitors are mainly used in the fields of national defense, aerospace, transportation, electronic information, and instrumentation , but its low energy density, ...

AI Technical Summary

Problems solved by technology

[0006] Although the introduction of P123 increases the average pore size of the RF gel, thereby avoiding the collapse of the gel skeleton during the drying process, but the introduction of P123 will block some micropore structures, greatly reducing the specific surface area of ​​the RF gel, making the RF gel Only two-dimensional channels can be realized, which greatly affects the electrochemical performance of carbon aerogels, especially the ion transport ability and cycle stability of carbon aerogels.

Images