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A kind of preparation method of biochar/graphene flexible composite film

A biochar and olefin flexible technology, applied in the field of biochar/graphene flexible composite film preparation, can solve the problems of low specific surface area of ​​graphene film, toxic/polluting by-products, inconvenient large-scale preparation, etc., to achieve Avoid synthesis process, improve surface activity, increase flexibility

Active Publication Date: 2020-01-07
BEIJING UNIV OF CHEM TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene films prepared by the above methods generally have low specific surface area, high cost, and are not convenient for large-scale preparation.
[0004] Studies have shown that organic polymers such as polypropylene, phenolic resin, and polypyrrole are electrospun into fiber membranes by electrospinning, and then activated by carbonization to prepare flexible porous carbon materials, but these carbon materials have poor electrical conductivity. The synthesis process of organic polymer raw materials is complex and usually produces toxic / polluting by-products, which does not conform to the current concept of green environmental protection and sustainable development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Put 100g of mulberry silk into 3000ml of 1wt% anhydrous sodium carbonate aqueous solution, heat it at 80°C for 1h, then wash it with deionized water, put it in a 40°C oven and dry it for 12h to obtain silk fiber;

[0032] (2) Add a certain mass of LiBr solid to deionized water, stir and dissolve to prepare a 9.3mol / L LiBr aqueous solution;

[0033] (3) Take 50 g of the silk fiber prepared in step (1), put it into 185 ml of LiBr aqueous solution with a concentration of 9.3 mol / L, stir in a constant temperature water bath at 60°C for 3 hours until completely dissolved; wait for the mixed solution to cool to room temperature Put it into a dialysis bag, dialyze it continuously in deionized water for 2 days, and then filter it with absorbent cotton to obtain the silk fibroin aqueous solution;

[0034] (4) Add 80g of silk fibroin aqueous solution with a concentration of 1wt% to 10g of a graphene oxide aqueous solution with a concentration of 10wt%, then add formic acid an...

Embodiment 2

[0039] (1) Put 100g of tussah silk into 6000ml of 1wt% anhydrous sodium carbonate aqueous solution, heat at 110°C for 1h, then wash it with deionized water, dry it in an oven at 70°C for 9h, and obtain silk fiber;

[0040] (2) Add a certain mass of LiBr solid to deionized water, stir and dissolve to prepare a 9.3mol / L LiBr aqueous solution;

[0041] (3) Take 50 g of the silk fiber prepared in step (1), put it into 371 ml of LiBr aqueous solution with a concentration of 9.3 mol / L, stir in a constant temperature water bath at 65°C for 1 hour until completely dissolved; wait for the mixed solution to cool to room temperature Put it into a dialysis bag, dialyze it continuously in deionized water for 4 days, and then filter it with absorbent cotton to obtain the silk fibroin aqueous solution;

[0042] (4) Add 144g of silk fibroin aqueous solution with a concentration of 10wt% to 100g of a graphene oxide aqueous solution with a concentration of 1wt%, then add phosphoric acid and 30....

Embodiment 3

[0047] (1) Put 100g willow silk into 4000ml of 1wt% anhydrous sodium carbonate aqueous solution, heat it at 100°C for 1h, then wash it with deionized water, put it in a 60°C oven and dry it for 11h to obtain silk fiber;

[0048] (2) Add a certain mass of LiBr solid to deionized water, stir and dissolve to prepare a 9.3mol / L LiBr aqueous solution;

[0049] (3) Take 50 g of the silk fiber prepared in step (1), put it into 309 ml of LiBr aqueous solution with a concentration of 9.3 mol / L, and stir it in a constant temperature water bath at 65°C for 2 hours until it is completely dissolved; after the mixed solution is cooled to room temperature Put it into a dialysis bag, dialyze it continuously in deionized water for 3 days, and then filter it with absorbent cotton to obtain a silk fibroin aqueous solution;

[0050] (4) Add 250g of silk fibroin aqueous solution with a concentration of 2wt% to 20g of a graphene oxide aqueous solution with a concentration of 5wt%, then add acetic a...

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Abstract

The invention provides a preparation method of a biomass charcoal / graphene flexible composite film. The nitrogen-rich biomass charcoal / graphene flexible composite film is prepared by the blended spinning solution containing the silk fibroin, the graphene oxide and the activator through the electrospinning technology and high temperature one-step carbonization activation. The material has the characteristics of being nitrogen-rich, porous and flexible. According to the method, the silk fibroin is rich in amino acids and can react with the graphene oxide in a cross-linking way through heating and stirring so that the graphene oxide is enabled to be aminated, the graphene oxide can be further reduced in the carbonization process, and the nitrogen atom part of the biomass residues in the composite material. The mass ratio of the biomass charcoal to the graphene in the obtained biomass charcoal / graphene flexible composite film is (0.5-9):1, the specific area is 1850-2740m2 / g and the mitogencontent is 3.6-9.4%. The composite film is applied to the electrode material of the supercapacitor and the sodium ion battery so as to show high specific capacity, long cycle life and excellent rateperformance.

Description

technical field [0001] The invention belongs to the field of graphene materials, in particular to a method for preparing a biomass charcoal / graphene flexible composite film. Background technique [0002] With the continuous advancement of science and technology and the increasing market demand for personal electronic products, concepts such as smart textiles and flexible mobile phones have been proposed, and various flexible and wearable electronic devices have been developed one after another. With the requirements of life, electronic products tend to be miniaturized and lightweight. It is an urgent need to develop a new generation of energy storage devices with high energy density, high power density and high cycle stability, which are lightweight, portable and flexible. [0003] Energy storage devices are mainly composed of four parts: cathode / anode, electrolyte, separator and outer packaging, among which electrolyte, separator and outer packaging are easy to achieve flex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/40H01G11/44H01G11/86H01M4/36H01M4/587H01M10/054
CPCH01G11/40H01G11/44H01G11/86H01M4/364H01M4/587H01M10/054Y02E60/10Y02E60/13
Inventor 徐斌官亦标吴琪沈进冉周淑琴胡龙丰
Owner BEIJING UNIV OF CHEM TECH
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