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Graphene electrode sheet and manufacturing method, and method for manufacturing supercapacitor by using graphene electrode sheet

A technology for graphene electrodes and supercapacitors, which is applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of large liquid absorption, low solid content of slurry, and low density of graphene materials, and achieve improved Excellent content, specific surface area, low dosage effect

Inactive Publication Date: 2018-08-31
NINGBO CRRC NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene materials have low density, large liquid absorption, and low solid content of slurry, which pose challenges to the processability and portability of supercapacitors, and face huge technical difficulties in engineering applications.

Method used

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  • Graphene electrode sheet and manufacturing method, and method for manufacturing supercapacitor by using graphene electrode sheet
  • Graphene electrode sheet and manufacturing method, and method for manufacturing supercapacitor by using graphene electrode sheet
  • Graphene electrode sheet and manufacturing method, and method for manufacturing supercapacitor by using graphene electrode sheet

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Experimental program
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Effect test

Embodiment 1

[0046] Super shear the graphene and conductive agent at a mass percentage of 88:6 to obtain a premixture; put the premixture into a kneader, add an appropriate amount of binder water emulsion, and stir for 30 minutes to obtain a dough-like electrode slurry pre-product. Among them, the specific surface area of ​​graphene is 1000-1500m 2 / g, the tap density is 0.2-0.5g / cm 3 , the pore size is 2-10nm, the particle size is 7-10μm, the carbon content is greater than 99.8%, the oxygen-containing functional group content is less than 0.35meq / g, the water content is less than 0.40%, and the total metal content is less than 100ppm. Its microscopic appearance is as follows figure 1 Shown; the current collector is a foamed aluminum current collector with a three-dimensional porous structure, and its microscopic appearance is as follows figure 2 As shown, the thickness of the aluminum foam current collector is 200-1500 μm, the average pore size is 50-200 μm, and the porosity is 85-95%; ...

Embodiment 2

[0051] Graphene and conductive agent are super-sheared at a mass percentage of 90:4 to obtain a pre-mixture; put the pre-mixture into a kneader, add an appropriate amount of binder water emulsion, and stir for 35 minutes to obtain a dough-like electrode slurry pre-finished product. Among them, the specific surface area of ​​graphene is 1000-1500m 2 / g, the tap density is 0.2-0.5g / cm 3 , the pore size is 2-10nm, the particle size is 7-10μm, the carbon content is greater than 99.8%, the oxygen-containing functional group content is less than 0.35meq / g, the water content is less than 0.40%, and the total metal content is less than 100ppm; the current collector is a foam with a three-dimensional porous structure Aluminum current collector, foamed aluminum current collector has a thickness of 200-1500 μm, an average pore diameter of 50-200 μm, and a porosity of 85-95%; the conductive agent is carbon black, carbon nanotubes and graphene in a mass ratio of 1:0.8:1.2 composite conduc...

Embodiment 3

[0056] Super-shear the graphene and conductive agent according to the mass percentage (80:8) to obtain a pre-mixture; put the pre-mixture into a kneader, add an appropriate amount of binder water emulsion, and stir for 25 minutes to obtain a dough-like electrode slurry pre-finished product .Wherein, the specific surface area of ​​graphene is 1000-1500m 2 / g, the tap density is 0.2-0.5g / cm 3 , the pore size is 2-10nm, the particle size is 7-10μm, the carbon content is greater than 99.8%, the oxygen-containing functional group content is less than 0.35meq / g, the water content is less than 0.40%, and the total metal content is less than 100ppm; the current collector is a foam with a three-dimensional porous structure Aluminum current collector, foamed aluminum current collector has a thickness of 200-1500 μm, an average pore diameter of 50-200 μm, and a porosity of 85-95%; the conductive agent is carbon black, carbon nanotubes and graphene in a mass ratio of 1:1.2:0.8 composite ...

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Abstract

The invention relates to a graphene electrode sheet and a manufacturing method, and a method for manufacturing a high specific-energy and ultra-high-power graphene supercapacitor by using the grapheneelectrode sheet and belongs to the new energy storage device technology field. The graphene electrode sheet comprises a current collector and a graphene electrode slurry. The graphene electrode slurry comprises, by weight, 75-93% of graphene, 2-10% of conductive agent, and 5-15% binder. The current collector is a foamed aluminum current collector. The specific surface area of graphene is 1000 to1500 m<2> / g, a tap density is 0.2 to 0.5 g / cm<3>, an aperture is 2 to 10 nm, a particle size is 7 to 10 micron, and a carbon content is greater than 99.8%. The content of an oxygen-containing functional group is less than 0.35 meq / g, a water content is less than 0.40%, and a total metal content is less than 100 ppm. The energy density of the graphene supercapacitor manufactured by the electrode sheet is 12 Wh / kg and a power density is 30.14 kW / kg.

Description

technical field [0001] The invention relates to a graphene electrode sheet, a preparation method thereof, and a method for preparing a graphene supercapacitor with high specific energy and ultra-high power, and belongs to the technical field of new energy storage devices. Background technique [0002] Supercapacitors have extremely high safety, million-cycle life, super-high power characteristics, good low-temperature performance, and environmental friendliness, and are a powerful choice to replace batteries. The United States "Discovery" listed it as one of the world's seven major scientific and technological discoveries in 2006. It is a national strategic emerging industry, a core key energy storage device for the core components of new energy vehicles and the field of high efficiency and energy saving. However, the current commercial supercapacitors have small capacity and low energy density. The energy density of traditional activated carbon-based electric double layer ...

Claims

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Application Information

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IPC IPC(8): H01G11/36H01G11/86
CPCH01G11/36H01G11/86Y02E60/13
Inventor 阮殿波郑超潘国林陈雪丹李林艳周洲
Owner NINGBO CRRC NEW ENERGY TECH CO LTD
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