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Porous graphene electrode for supercapacitor and preparation method thereof

A technology of porous graphene and supercapacitor, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc., can solve the problems of poor dispersion effect, discount of supercapacitor effect, and easy agglomeration of graphene, with short time and cost. Low, the effect of improving the electrode structure

Active Publication Date: 2021-05-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the graphene conductive paste prepared by mixing graphene and activated carbon, graphene is easy to agglomerate and the dispersion effect is poor, which leads to a greatly reduced effect of the prepared supercapacitor

Method used

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  • Porous graphene electrode for supercapacitor and preparation method thereof
  • Porous graphene electrode for supercapacitor and preparation method thereof
  • Porous graphene electrode for supercapacitor and preparation method thereof

Examples

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preparation example Construction

[0043] A kind of preparation method of porous graphene electrode for supercapacitor of the present invention comprises the following steps:

[0044] S1, disperse the graphene oxide in water, and magnetically stir to make a graphene oxide aqueous dispersion;

[0045] The speed of magnetic stirring is 100-300 rpm / min.

[0046] S2, adding porous graphene to the graphene oxide aqueous dispersion prepared in step S1, and obtaining dispersion A through magnetic stirring and ultrasonic dispersion;

[0047] S3, adding carbon nanotubes to the dispersion A prepared in step S2, and adding a binder a, homogenizing, magnetic stirring, and ultrasonic dispersion to make a stable dispersion B;

[0048] The mass percent of porous graphene, graphene oxide and carbon nanotubes in the modifier is 70%: (1%~29%): (29%~1%), and porous graphene is a high-energy microwave rapid self-made high-energy compound in the laboratory. Conductive porous graphene, in the process of preparing porous graphene b...

Embodiment 1

[0067] S1, disperse graphene oxide in water, control the speed of magnetic stirring to 300rpm / min, and make graphene oxide aqueous dispersion;

[0068] S2, the time for controlling the microwave action is 40s, and the power control of the microwave action per gram of raw material is 400W; the used oxidative atmosphere of the microwave action is air; the atmosphere of the purified porous graphene is argon, and the porous graphene is prepared using the microwave method, which will be prepared The porous graphene was added to the graphene oxide aqueous dispersion prepared in step S1, and the speed of magnetic stirring was controlled to 300rpm / min for magnetic stirring, and then ultrasonically dispersed at 1200W for 1.5 hours to prepare dispersion A;

[0069] S3. Add carbon nanotubes to the dispersion A prepared in step S2, wherein the mass ratio of porous graphene, graphene oxide and carbon nanotubes is 7:1:2. Add binding agent a then, binding agent a is sodium carboxymethylcellu...

Embodiment 2

[0075] S1, disperse graphene oxide in water, control the speed of magnetic stirring to 300rpm / min, and make graphene oxide aqueous dispersion;

[0076] S2, the time for controlling the microwave action is 10s, and the power control of the microwave action per gram of raw material is 200W; the used oxidizing atmosphere of the microwave action is air; the atmosphere of the purified porous graphene is argon, and the porous graphene is prepared using the microwave method, and the prepared The porous graphene was added to the graphene oxide aqueous dispersion prepared in step S1, and the speed of magnetic stirring was controlled to 300rpm / min for magnetic stirring, and then ultrasonically dispersed at 1200W for 1.5 hours to prepare dispersion A;

[0077] S3. Add carbon nanotubes to the dispersion A prepared in step S2, wherein the mass ratio of porous graphene, graphene oxide and carbon nanotubes is 7:1:2. Add binding agent a then, binding agent a is sodium carboxymethylcellulose (...

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Abstract

The invention discloses a porous graphene electrode for a supercapacitor and a preparation method thereof, and the method comprises the steps: dispersing graphene oxide in water, and carrying out magnetic stirring to prepare a graphene oxide aqueous dispersion; adding porous graphene into the graphene oxide aqueous dispersion, magnetically stirring, and ultrasonically dispersing to obtain a dispersion A; adding carbon nanotubes into the dispersion liquid A, adding a binder a, and performing homogenization, magnetic stirring and ultrasonic dispersion to prepare a stable dispersion liquid B; adding conductive carbon black into the stable dispersion liquid B, magnetically stirring and ultrasonically dispersing to prepare conductive agent dispersion liquid C; and adding the conductive agent dispersion liquid C, activated carbon and a binder b into deionized water for ultrasonic dispersion, performing vacuum stirring and oscillation to prepare supercapacitor slurry, coating the supercapacitor slurry on a carbon-coated aluminum foil, drying the coated carbon-coated aluminum foil, then performing vacuum drying and compaction, and then cutting into an electrode and packaging to prepare the supercapacitor. The preparation process is simple to operate and high in controllability.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to a porous graphene electrode for supercapacitors and a preparation method thereof. Background technique [0002] A supercapacitor is a new type of energy storage conversion device that stores energy through an interfacial double layer formed between an electrode and an electrolyte. According to the principle of energy storage, it can be divided into double-electric capacitors, quasi-Faraday capacitors and hybrid supercapacitors. Supercapacitors have been widely used due to their advantages such as high power density, long cycle charge-discharge life, high charge-discharge efficiency, long energy storage life, high reliability and wide operating temperature range. Compared with traditional capacitors, electric double-layer supercapacitors stand out among various energy storage devices due to their ultra-high capacity and ultra-high power density due to the use o...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/24H01G11/32
CPCH01G11/24H01G11/32H01G11/86Y02E60/13
Inventor 韩晓刚李鸿杰陈韦蒙白宇鸽杨超卢亚飞
Owner XI AN JIAOTONG UNIV
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