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Cobalt aluminum hydrotalcite/fluorinated graphene composite material, and preparation method thereof

A technology of fluorinated graphene and composite materials, applied in cobalt compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as limited binding, reduced specific surface area, and reduced binding sites, achieving good stability and conditions Gentle, long cycle life effect

Active Publication Date: 2016-12-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Diethylaminosulfur trifluoride has a good fluorination effect in organic solvents, but organic solvents limit the combination of prepared fluorinated graphene with other high specific capacitance materials
However, the use of hydrofluoric acid to fluorinate graphene oxide, the obtained fluorinated graphene product is easy to aggregate, resulting in a decrease in its specific surface area, and a corresponding reduction in the binding sites with high specific capacitance materials

Method used

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  • Cobalt aluminum hydrotalcite/fluorinated graphene composite material, and preparation method thereof
  • Cobalt aluminum hydrotalcite/fluorinated graphene composite material, and preparation method thereof
  • Cobalt aluminum hydrotalcite/fluorinated graphene composite material, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare cobalt aluminum hydrotalcite / fluorinated graphene composite material, the steps are as follows:

[0033] 1) adopt Hummers method to prepare graphite oxide powder;

[0034] 2) Disperse 25 mg of graphite oxide powder obtained in step 1) in 50 mL of deionized water to obtain a graphite oxide dispersion, then peel it off with an ultrasonic cell pulverizer for 6 min (pulse: 01 01, amplitude: 30%), and then use a centrifuge at 4500r Centrifuge under the condition of 25min / min, take the supernatant, and add 2mL of hydrofluoric acid solution with a mass concentration of 40% to the supernatant, stir for 2h, then transfer to an autoclave and react at a constant temperature of 150°C for 8h, then Cool to room temperature, filter and wash to neutrality to obtain fluorinated graphene;

[0035] 3) Disperse 22 mg of the fluorinated graphene obtained in step 2) in 100 mL of ethanol solution with a mass concentration of 25%, and peel it off for 10 minutes with an ultrasonic cell...

Embodiment 2

[0040] Prepare cobalt aluminum hydrotalcite / fluorinated graphene composite material, the steps are as follows:

[0041] 1) adopt Hummers method to prepare graphite oxide powder;

[0042] 2) Disperse 40 mg of the graphite oxide powder obtained in step 1) in 50 mL of deionized water to obtain a graphite oxide dispersion, then peel it off with an ultrasonic cell pulverizer for 9 minutes (pulse: 01 01, amplitude: 30%), and then use a centrifuge at 4000r Centrifuge under the condition of 40min / min, take the supernatant, and add 2mL hydrofluoric acid solution with a mass concentration of 40% to the supernatant, stir for 4h, then transfer to an autoclave and react at a constant temperature of 120°C for 10h, then Cool to room temperature, filter and wash to neutrality to obtain fluorinated graphene;

[0043] 3) Disperse 36 mg of the fluorinated graphene obtained in step 2) in 80 mL of ethanol solution with a mass concentration of 20%, and peel it off for 12 minutes with an ultrasonic...

Embodiment 3

[0047] Prepare cobalt aluminum hydrotalcite / fluorinated graphene composite material, the steps are as follows:

[0048] 1) adopt Hummers method to prepare graphite oxide powder;

[0049] 2) Disperse 60 mg of the graphite oxide powder obtained in step 1) in 50 mL of deionized water to obtain a graphite oxide dispersion, then peel it off with an ultrasonic cell pulverizer for 12 min (pulse: 01 01, amplitude: 40%), and then use a centrifuge at 4000r Centrifuge under the condition of 30min / min, take the supernatant, and add 6mL hydrofluoric acid solution with a mass concentration of 40% to the supernatant, stir for 6h, then transfer to an autoclave and react at a constant temperature of 140°C for 12h, then Cool to room temperature, filter and wash to neutrality to obtain fluorinated graphene;

[0050] 3) Disperse 55 mg of the fluorinated graphene obtained in step 2) in 50 mL of ethanol solution with a mass concentration of 30%, and peel it off for 15 minutes with an ultrasonic ce...

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Abstract

This invention relates to a cobalt aluminum hydrotalcite / fluorinated graphene composite material, and a preparation method thereof. The composite material is prepared by the steps of: 1) preparing graphite oxide powder by a Hummers method; 2) dispersing the graphite oxide powder in deionized water; stripping by an ultrasonic cell crusher; centrifuging by a centrifuge; obtaining supernatant liquor; adding hydrofluoric acid solution in the supernatant liquor to stir and react; putting the solution into a high-pressure reactor to perform constant-temperature fluoridation; cooling to room temperature; filtering and washing till the solution is neutral, so as to obtain the fluorinated graphene; 3) dispersing the fluorinated graphene in ethanol solution; stripping by the ultrasonic cell crusher to obtain fluorinated graphene suspension; 4) adding cobalt sulfate heptahydrate, aluminum chloride hexahydrate and urea into the fluorinated graphene suspension to stir and react; putting the solution into the high-pressure reactor to perform hydrothermal reaction; then cooling to the room temperature; and obtaining the cobalt aluminum hydrotalcite / fluorinated graphene composite material after post-processing.

Description

technical field [0001] The invention relates to a cobalt aluminum hydrotalcite / fluorinated graphene composite material and a preparation method thereof. Background technique [0002] Fluorinated graphene can be regarded as graphene partially or fully fluorinated, sp in graphite 2 The structure is partially or fully converted to sp 3 , but still maintain a flaky structure. Fluorinated graphene has strong electrochemical activity and good electrode stability, so it is widely used in the field of energy storage, such as the positive electrode of high energy density lithium batteries, the negative electrode of lithium ion batteries and the counter electrode of dye-sensitized solar cells, etc. General and high specific capacitance material SnO 2 And so on compound use. [0003] At present, there are two main methods for preparing fluorinated graphene, one is to exfoliate fluorinated graphite, and the other is to modify graphene or graphene oxide with fluorine reagents. The y...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/32C01G51/00C01B31/04
CPCY02E60/13H01G11/30C01G51/00H01G11/32
Inventor 宋少先彭伟军李洪强刘艳艳
Owner WUHAN UNIV OF TECH
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