Low internal resistance and high power graphene super capacitor electrode sheet and manufacturing method

A technology for supercapacitors and graphene electrodes, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., and can solve problems such as difficulty in the preparation of graphene electrode sheets, low density of graphene materials, and low solid content of slurry , achieve good mechanical properties, increase specific energy, and excellent specific surface area

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, the density of graphene material is low, the amount of liquid absorption is large, and the solid content of slurry is low. It is difficult to realize the preparation of graphene electrode sheet by traditional wet coating process.

Method used

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  • Low internal resistance and high power graphene super capacitor electrode sheet and manufacturing method
  • Low internal resistance and high power graphene super capacitor electrode sheet and manufacturing method
  • Low internal resistance and high power graphene super capacitor electrode sheet and manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The graphene, the conductive agent and the adhesive are uniformly mixed in advance according to the mass percentage of 88:6:6, and the above-mentioned mixture is super-shear mixed at a shear rate of 10000rpm, and then under a pressure of 150MPa, the dry mixture is sequentially Carry out "vertical" and "horizontal" two-step rolling to obtain a graphene carbon film with uniform thickness. The specific surface area of ​​described 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 conductive agent is a three-phase composite conductive agent of conductive carbon black, carbon nanotubes and graphene, and the mass ratio of the three is 1:1:1. The compos...

Embodiment 2

[0037] The graphene, conductive agent and adhesive are pre-mixed uniformly according to the mass percentage of 90:4:6, and the above-mentioned mixture is super-sheared and mixed under the condition of a shear speed of 11000rpm, and then under a pressure of 200MPa, the dry mixture is successively Carry out "vertical" and "horizontal" two-step rolling to obtain a graphene carbon film with uniform thickness. The specific surface area of ​​described 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 conductive agent is a three-phase composite conductive agent of conductive carbon black, carbon nanotubes and graphene, and the mass ratio of the three is 1:1.1:0.9. The composite conductive agent powder is obtained b...

Embodiment 3

[0041] The graphene, conductive agent and adhesive are pre-mixed uniformly according to the mass percentage of 85:8:7, and the above-mentioned mixture is super-sheared and mixed under the condition of a shear speed of 9000rpm, and then under a pressure of 250MPa, the dry mixture is successively Carry out "vertical" and "horizontal" two-step rolling to obtain a graphene carbon film with uniform thickness. The specific surface area of ​​described 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 conductive agent is a three-phase composite conductive agent of conductive carbon black, carbon nanotubes and graphene, and the mass ratio of the three is 1:0.9:1.1. The composite conductive agent powder is obtained by...

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Abstract

The invention relates to a graphene super capacitor electrode sheet, especially relates to a low internal resistance and high power graphene super capacitor electrode sheet and a manufacturing methodand 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% of binder. The current collector is a coating aluminum foil. The thickness of the graphene electrode sheet is 100-200 microns, and a surface density is 0.5-0.7g / cm<3>. The super capacitor graphene electrode sheet has characteristics of a low internal resistance, high power and the like.

Description

technical field [0001] The invention relates to a graphene supercapacitor electrode sheet, in particular to a low internal resistance, high power graphene supercapacitor electrode sheet and a preparation method thereof, belonging 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. 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 capacitors is close to the limit, and it is difficult to further increase the power density. It is urgent to devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/36H01G11/86
CPCH01G11/36H01G11/86Y02E60/13H01G11/38H01G11/24
Inventor 阮殿波郑超陈雪丹李林艳周洲
Owner NINGBO CRRC NEW ENERGY TECH CO LTD
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