Porous graphene enhanced supercapacitor and preparation method thereof

A porous graphene and supercapacitor technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of inability to provide charges, low specific capacity, and low specific surface area of ​​graphene, so as to improve the volumetric energy density , short preparation time and simple preparation method

Inactive Publication Date: 2020-03-20
杭州阳名新能源设备科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene prepared by chemical methods is prone to stacking due to the van der Waals force between the sheets, so the specific surface area of ​​graphene is much lower than the theoretical value.
Cannot provide enough active sites to store charge, so when it is used as a capacitor electrode material, the actual specific capacity is low

Method used

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  • Porous graphene enhanced supercapacitor and preparation method thereof
  • Porous graphene enhanced supercapacitor and preparation method thereof
  • Porous graphene enhanced supercapacitor and preparation method thereof

Examples

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preparation example Construction

[0036] A kind of supercapacitor preparation method reinforced by porous graphene of the present invention, comprises the following steps:

[0037] S1. After mixing activated carbon, porous graphene and polyvinylidene fluoride (PVDF), add N-methylpyrrolidone (NMP) solvent, stir evenly through a ball mill tank to make electrode slurry, and coat it on carbon-coated aluminum foil;

[0038] The mass percentage of activated carbon, porous graphene and PVDF is (80%~89%): (1%~10%): 10%, the mass ratio of solute to solvent is 1: (4~6), and the ball milling speed is 300~ 400rpm, the thickness of the carbon-coated aluminum foil is 15-20 microns, and the thickness of the coating is 150-200 microns.

[0039] S2. Put the coated carbon-coated aluminum foil into a blast oven for drying treatment, put the dried carbon-coated aluminum foil into a vacuum oven to continue processing, and put it on an electric double-roller machine and roll it tightly to form a pole piece;

[0040] The temperatur...

Embodiment 1

[0048] Take 0.8g of activated carbon, 0.1g of porous graphene, 0.1g of PVDF, add 3.5ml of NMP solvent through a ball mill and stir at a speed of 400rpm to form an electrode slurry, and coat it on a 20μm thick carbon-coated aluminum foil with a 150μm scraper;

[0049] Put the coated carbon-coated aluminum foil in a blast oven for 3 hours at 80°C, then put the dried carbon-coated aluminum foil in a vacuum oven at 70°C for 10 hours, take it out, put it on an electric double-roller machine, and roll it tightly. Pole piece, so that the thickness is 80% of that before rolling;

[0050] Cut the prepared pole piece and package the button battery for electrochemical test and charge-discharge test.

Embodiment 2

[0052] Take 0.85g of activated carbon, 0.05g of porous graphene, 0.1g of PVDF, add 3.0ml of NMP solvent through a ball mill and stir at a speed of 350rpm to form an electrode slurry, and use a 100μm scraper to coat it on a 18μm thick carbon-coated aluminum foil;

[0053] Put the coated carbon-coated aluminum foil in a blast oven at 90°C for 3 hours, put the dried carbon-coated aluminum foil in a vacuum oven at 100°C for 10 hours, take it out, put it on an electric roller machine and roll it tightly to make it Pole piece, the thickness is 90% of that before rolling;

[0054] Cut the prepared pole piece and package the button battery for electrochemical test and charge-discharge test.

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Abstract

The preparation method comprises the following steps: mixing activated carbon, porous graphene and PVDF (Polyvinylidene Fluoride), adding an N-methyl pyrrolidone solvent, carrying out ball-milling andstirring to prepare electrode slurry, and coating a carbon-coated aluminum foil with the electrode slurry; putting the coated carbon-coated aluminum foil into a blast drying oven for drying treatment, putting the dried carbon-coated aluminum foil into a vacuumizing drying oven for continuous treatment, and putting the carbon-coated aluminum foil on an electric double-roller machine for roller compaction to prepare a pole part; and cutting and packaging the prepared pole part to prepare the super capacitor. The method is simple in design, pollution-free in preparation process, free of high temperature and safe in process. And the cost can be reduced, large-scale production can be carried out, and wide application of the porous graphene-based supercapacitor with high energy density is realized.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to a porous graphene-enhanced supercapacitor and a preparation method thereof. Background technique [0002] Supercapacitor is a new type of electric energy storage device between traditional capacitors and secondary batteries. It has outstanding advantages such as high power density, long cycle life, short charge and discharge time, environmental friendliness and wide operating temperature range. The field of energy shows great application prospects. However, its energy density is lower than that of secondary batteries, and it is difficult to meet the urgent needs of large-scale hybrid equipment and electric vehicles that have higher requirements for power and energy density. Therefore, it is crucial to pursue high energy density without sacrificing power density and cycle life in parallel with the rapidly growing demands of supercapacitor technology. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/84H01G11/38H01G11/36
CPCH01G11/36H01G11/38H01G11/84H01G11/86Y02E60/13
Inventor 韩晓刚白宇鸽吴晓东尹玉婷王琦杨超
Owner 杭州阳名新能源设备科技有限公司
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