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Super capacitor and preparation method thereof

A supercapacitor, ultrasonic dispersion technology, applied in the manufacture of hybrid/electric double-layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of agglomeration and stacking, difficulty in mass production, etc., to prevent agglomeration, avoid loss, and good flexibility.

Active Publication Date: 2016-11-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, graphene-based supercapacitors have the problem of easy agglomeration and stacking of graphene under the action of van der Waals force during the preparation process, and it is difficult to achieve large-scale production at low cost.

Method used

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  • Super capacitor and preparation method thereof
  • Super capacitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) 0.192g of graphite oxide (prepared by the improved Hummers method) is added to a beaker with 80ml of ultrapure water, stirred evenly for 20min, then the beaker is transferred to the cell disruptor, and then the cell disruptor (30 ℃, 400W) ultrasonic for 10min. A graphene oxide aqueous dispersion with a graphene oxide concentration of 0.0024 g / ml was obtained.

[0035] (2) Cut 2.208g of waste newspapers (after vacuum drying) into pieces and put them into a pulp deflaking machine, add 1000ml of water to decompose at 10,000 rpm. A pulp of approximately 0.22% consistency was obtained.

[0036] (3) Add 0.01g of cationic polyacrylamide into a beaker filled with 10ml of ultrapure water, and stir at 100rpm for 12h. An aqueous solution of cationic polyacrylamide with a concentration of about 0.001 g / ml was obtained.

[0037] (4) Add 3.84ml of the cationic polyacrylamide aqueous solution in (3) to the cellulose pulp in (2), and stir slowly with a glass rod for 2 minutes. ...

Embodiment 2

[0041] (1) Add 0.192g of graphite oxide (prepared by the improved Hummers method) into a beaker containing 80ml of ultrapure water, stir evenly for 20min, then transfer the beaker to an ultrasonic cleaner, 80W, 60°C for 2h. A graphene oxide aqueous dispersion with a graphene oxide concentration of 0.0024 g / ml was obtained.

[0042] (2) Add 2.208g of coniferous wood pulp slurry (after vacuum drying) into the pulp deflaking machine, add 1000ml of water to deflank at 15,000 rpm. A softwood pulp with a consistency of about 0.22% is obtained.

[0043] (3) Add 0.01 g of chitosan quaternary ammonium salt into a beaker containing 10 ml of ultrapure water, and stir at 100 rpm for 12 h. A chitosan quaternary ammonium salt aqueous solution with a concentration of about 0.001 g / ml was obtained.

[0044] (4) Add 3.84ml of the chitosan quaternary ammonium salt aqueous solution in (3) to the cellulose pulp in (2), and slowly stir for 2 min with a glass rod. Then add the graphene oxide aqu...

Embodiment 3

[0048] (1) 0.192g of graphite oxide (prepared by the improved Hummers method) is added to a beaker with 80ml of ultrapure water, stirred evenly for 20min, then the beaker is transferred to the cell disruptor, and then the cell disruptor (30 ℃, 400W) ultrasonic for 10min. A graphene oxide aqueous dispersion with a graphene oxide concentration of 0.0024 g / ml was obtained.

[0049] (2) Add 2.208g of coniferous wood pulp slurry (after vacuum drying) into the pulp deflaking machine, add 1000ml of water to deflank at 15,000 rpm. A softwood pulp with a consistency of about 0.22% is obtained.

[0050] (3) Add 0.01g of cationic polyacrylamide into a beaker filled with 10ml of ultrapure water, and stir at 100rpm for 12h. An aqueous solution of cationic polyacrylamide with a concentration of about 0.001 g / ml was obtained.

[0051] (4) Add 3.84ml of the cationic polyacrylamide aqueous solution in (3) to the cellulose pulp in (2), and stir slowly with a glass rod for 2 minutes. Then ad...

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Abstract

The invention belongs to the field of material science, and discloses a supercapacitor and a preparation method thereof, comprising the following steps: (1) adding a positively charged cationic retention aid aqueous solution into cellulose pulp and stirring to obtain a wrapped retention aid (2) mix the graphene oxide aqueous solution with the fiber mixed pulp wrapped with retention aid, and stir slowly to obtain graphene oxide cellulose mixed pulp; (3) mix the obtained mixed pulp manually Papermaking on the sheet machine, pressing and dehydrating to obtain graphene oxide / cellulose composite paper after drying; (4) adding a reducing agent to the obtained composite paper to reduce it into graphene / cellulose composite paper; (5) to the above-mentioned composite paper The paper is cut, attached to the current collector, electrolyte and separator are added for packaging and fixing, and assembled into a symmetrical supercapacitor. The preparation process of the invention is simple, and the prepared supercapacitor is light in weight and good in flexibility.

Description

technical field [0001] The invention relates to a supercapacitor based on graphene / cellulose composite paper and a preparation method thereof, belonging to the technical field of supercapacitors. Background technique [0002] A supercapacitor is a new type of energy storage device between a physical capacitor and a secondary battery. This device is unique in its energy storage and release process, which is not only reflected in the high pulse rate charge and discharge process, but also has the advantages of high energy and high specific power, that is, the charge and discharge time is only tens of seconds, and its power density is comparable to that of Compared with batteries, it is 10-100 times higher; the energy density is 100 times that of physical capacitors. [0003] Graphene is a single-layer carbon molecule composed of carbon atoms arranged in a hexagonal shape and connected to each other. Research has found that supercapacitors using graphene as electrode materials...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/36H01G11/84H01G11/86
CPCY02E60/13H01G11/30H01G11/36H01G11/84H01G11/86
Inventor 王小慧黄权波孙润仓徐曼曼
Owner SOUTH CHINA UNIV OF TECH
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