Method for preparing carbon aerogel by utilizing normal-pressure drying

A technology of carbon aerogel and atmospheric pressure drying, which is applied in the direction of airgel preparation, carbon preparation/purification, chemical instruments and methods, etc., can solve the problem of affecting carbon aerogel ion transmission capacity and cycle stability, affecting Electrochemical properties of airgel, reducing the specific surface area of ​​RF gel, etc., to achieve the effects of avoiding skeleton collapse, reducing shrinkage, and low price

Inactive Publication Date: 2020-08-07
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Method for preparing carbon aerogel by utilizing normal-pressure drying
  • Method for preparing carbon aerogel by utilizing normal-pressure drying

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A method for preparing carbon airgel by drying under normal pressure:

[0033] (1) Precursor preparation: Weigh 15g of resorcinol, 8.181g of formaldehyde, and 50ml of deionized water, place them in a 500ml beaker, stir on a magnetic stirrer, and wait until the resorcinol is completely dissolved. Add 0.1443g of anhydrous sodium carbonate, stir in a 40-60°C constant temperature oil bath for 30-50min, then add 1.59g of F127 into the above solution and stir until the solution is uniform, then stir in a 60°C constant temperature oil bath for 30-50min , and then add deionized water to make the solid content of the precursor become 40%, and then magnetically stir at a speed of 600-800r / min to obtain a uniformly dispersed reddish-brown emulsion;

[0034] (2) Sol-gel: transfer the reddish-brown emulsion to a stoppered Erlenmeyer flask for sealing; then place the sealed Erlenmeyer flask with a stopper in a constant temperature oil bath at 40-60°C for sol-gel reaction for 1d, The...

Embodiment 2

[0039] The amount of F127 in Example 1 was adjusted to 2.01g, other experimental conditions were the same as above, the structure and performance test results of the prepared material were: the specific surface area of ​​the prepared material was 801.1m 2 / g; Electrochemical performance tests show that its specific capacity is 195.77F / g; it provides an energy density of 20.76Wh / kg at a power density of 590.97W / kg, showing good performance; carbon airgel materials in After 2000 cycles at a current density of 0.1A / g, the capacity retention rate reaches 94.38%, and the material performance is better than that of Example 1; the morphology of the prepared material is as follows figure 2 As shown, the specific surface area and pore structure analysis data are shown in Table 1.

[0040] The specific surface area and pore structure analysis data of table 1 embodiment 1 and embodiment 2

[0041] sample S BET (m 2 / g)

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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, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05B01J13/00
CPCB01J13/0091C01B32/05
Inventor 陈安国石斌张亮廖敏会刘力陈晓涛王庆杰陈铤
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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