Electrode pad for graphene-based supercapacitor and preparation method of electrode pad

A technology of supercapacitors and electrode pole pieces, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, etc. It can solve the problems of detachment of active materials from current collectors, insufficient bonding strength of binders, and shortened cycle life. Achieve strong electrolyte adsorption and storage capacity, improve high-rate discharge performance, and reduce battery internal resistance

Active Publication Date: 2016-06-15
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This connection method often leads to the gradual separation of the active material and the current collector during the charging and discharging process due to the insufficient bonding strength of the binder, which increases the internal resistance of the battery, shortens the cycle life, and has safety problems in the battery.
In addition, due to the high density of metal current collectors, the proportion of active materials in the entire electrode will be reduced, which limits the further improvement of battery energy density.

Method used

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  • Electrode pad for graphene-based supercapacitor and preparation method of electrode pad
  • Electrode pad for graphene-based supercapacitor and preparation method of electrode pad
  • Electrode pad for graphene-based supercapacitor and preparation method of electrode pad

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A preparation method for an electrode pole piece of a graphene-based supercapacitor comprises the following steps:

[0039] 1) Prepare layered graphene slurry: 2.5g graphene and 0.5g carbon nanotube prepared by physical exfoliation are dispersed in 50ml water to form slurry;

[0040] 2) Prepare porous graphene slurry: 25g graphene, 5g carbon nanotubes, 50g potassium hydroxide prepared by chemical oxidation method are dispersed in 100ml water to form slurry;

[0041] 3) Preparation of electrode pole piece: Brush the mixed slurry obtained in steps 1) and 2) successively on the substrate, heat at 800°C for 2h in an inert atmosphere, soak the obtained sample in 1M hydrochloric acid for 2h for cleaning, and then Wash with water, dry at 100°C for 10 hours, and roll the dried sample directly to obtain the electrode sheet.

[0042] figure 1 Shown is the laminated graphene layer (current collector layer), and it can be seen that the surface of the laminated graphene layer is u...

Embodiment 2

[0048] A preparation method for an electrode pole piece of a graphene-based supercapacitor comprises the following steps:

[0049] 1) Prepare laminated graphene slurry: disperse 5g of graphene and 0.5g of carbon nanotubes prepared by physical exfoliation in 80ml of water to form a slurry;

[0050] 2) Preparation of porous graphene slurry: disperse 30g of graphene, 5g of carbon nanotubes, and 70g of sodium hydroxide prepared by chemical oxidation into 200ml of water to form a slurry;

[0051] 3) Preparation of electrode pole piece: brush the mixed slurry obtained in steps 1) and 2) on the substrate successively, heat at 1000° C. for 1 h in an inert atmosphere, and soak the obtained sample in 1M hydrochloric acid for 2 h for cleaning. Then wash with water, dry at 100°C for 10 hours, and roll the dried sample directly to obtain the electrode sheet.

Embodiment 3

[0053] A preparation method for an electrode pole piece of a graphene-based supercapacitor comprises the following steps:

[0054] 1) Prepare stacked graphene slurry: disperse 5 g of graphene and 0.5 g of carbon nanotubes prepared by physical exfoliation in 90 ml of water to form a slurry;

[0055] 2) Preparation of porous graphene slurry: disperse 100g of graphene, 5g of carbon nanotubes, and 400g of cobalt particles prepared by chemical oxidation into 900ml of water to form a slurry;

[0056] 3) Preparation of electrode pole piece: brush the mixed slurry obtained in steps 1) and 2) successively on the substrate, heat at 500°C for 8 hours in an inert atmosphere, soak the obtained sample in 1M hydrochloric acid for 2 hours, and then Wash with water, dry at 100°C for 10 hours, and roll the dried sample directly to obtain the electrode sheet.

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Abstract

The invention provides an electrode pad for a graphene-based supercapacitor and a preparation method of the electrode pad. The electrode pad comprises a current collector layer and an active material layer, wherein the current collector layer is a stacked graphene layer; and the active material layer is a porous graphene layer. The preparation method comprises the following steps: (1) preparing mixed slurry containing physically stripped graphene and a carbon nanotube or/and carbon fiber; (2) preparing mixed slurry containing the graphene which is prepared by a chemical oxidation method, a pore-forming agent and the carbon nanotube or/and carbon fiber; and (3) sequentially painting the mixed slurry obtained in the step (1) and the mixed slurry obtained in the step (2) on a substrate, carrying out heating in an inert atmosphere, carrying out pickling and washing in sequence, and drying and rolling the mixed slurry to obtain the electrode pad. The active material layer of the electrode pad is in tight contact with the current collector layer, so that the interface resistance and the internal resistance of a battery can be effectively reduced; and the electrode pad has high electrolyte adsorption and storage capacities and improves the high-rate discharge performance and the energy density of the capacitor.

Description

technical field [0001] The invention relates to an electrode pole piece of a supercapacitor, in particular to an electrode pole piece for a graphene-based supercapacitor and a preparation method thereof. Background technique [0002] In recent years, with the acceleration of industrialization and the increasingly severe energy and environmental problems in today's world, people's demand for clean, efficient and renewable energy continues to increase, and the efficient conversion and storage of energy has also attracted increasing attention. As an important energy storage device, supercapacitors have the characteristics of high power density, fast charging and discharging, long cycle life of millions of times, and safety and reliability. However, current supercapacitors have the disadvantage of low energy density, and the energy density of commercial activated carbon supercapacitors is only 5-7 Wh / kg. In order to meet the growing needs, it is one of the development trends in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/28H01G11/36H01G11/86
CPCH01G11/24H01G11/28H01G11/36H01G11/86Y02E60/13
Inventor 徐丽陈新韩钰盛鹏刘双宇王博赵广耀刘海镇马光祝志祥杨富尧陈川
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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