Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparation of flexible self-support electrode with graphene as conductive binder and electrode

A technology of self-supporting electrodes and conductive binders, applied in battery electrodes, hybrid capacitor electrodes, electrolytic capacitors, etc., can solve the problems of damaging the electrochemical performance of active materials, limiting the energy density of energy storage devices, and high cost, and achieving improvement Electronic conductivity and ion mobility, avoiding the use of current collectors, and the effect of good mechanical properties

Inactive Publication Date: 2018-08-10
TONGJI UNIV
View PDF5 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the binder is a polymer, the presence of these polymer binders will affect the electronic conductivity and impair the electrochemical performance of the active material; the current collector usually requires the use of expensive metal thin films
Therefore, in traditional electrodes, the addition of conductive agents, binders, and current collectors will not only increase additional costs and damage the performance of active materials, but also occupy too much mass and volume, which greatly limits the energy density of energy storage devices.
In addition, these traditional electrodes prepared by the slurry coating method also have great deficiencies in flexibility, and it is difficult to meet the needs of wearable devices for flexible electrodes.
However, the existing flexible electrodes are usually prepared by loading nanoscale active materials on flexible conductive current collectors, which are expensive, difficult to produce and apply on a large scale, and are not compatible with commercial active materials such as graphite or lithium iron phosphate.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparation of flexible self-support electrode with graphene as conductive binder and electrode
  • Method for preparation of flexible self-support electrode with graphene as conductive binder and electrode
  • Method for preparation of flexible self-support electrode with graphene as conductive binder and electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) With 50 mesh expanded graphite as raw material, large-size graphene oxide is prepared by the Hummers method;

[0039] 2) Take 22.4mg of artificial graphite powder (particle size about 15μm), put it into a weighing bottle, add 3mL of 4.915mg / mL graphene oxide solution, stir magnetically for 2 hours and place it in an ultrasonic cleaning device for ultrasonic dispersion for 30 minutes to make it well mixed;

[0040] 3) Pour the product of step 2) into a petri dish with a diameter of 55 mm, and freeze-dry to obtain a round cake-shaped airgel;

[0041] 4) Press the product obtained in step 3) into thin slices with a pressure of 10 MPa with a hydraulic press, and cut it into small discs with a diameter of 12 mm with a slicer;

[0042] 5) The product obtained in step 4) is calcined and reduced in a tube furnace at 600°C for 3 hours in an argon protective atmosphere (the mass ratio of graphene:artificial graphite after reduction is about 1:4), and a graphene-based flexible...

Embodiment 2

[0047] 1) With 50 mesh expanded graphite as raw material, large-size graphene oxide is prepared by the Hummers method;

[0048]2) Take 22.4 mg of commercial lithium iron phosphate powder (particle size about 1 μm), put it into a weighing bottle, add 3 mL of 4.915 mg / mL graphene oxide solution, stir magnetically for 2 hours and place it in an ultrasonic cleaner for ultrasonic dispersion for 30 minutes to mix well;

[0049] 3) Pour the product of step 2) into a petri dish with a diameter of 55 mm, and freeze-dry to obtain a round cake-shaped airgel;

[0050] 4) Compress the product obtained in step 3) into thin slices with a pressure of 20 MPa with a hydraulic press, and cut it into small discs with a diameter of 12 mm with a slicer;

[0051] 5) The product obtained in step 4) is calcined and reduced in a tube furnace at 600°C for 3 hours in an argon protective atmosphere (the mass ratio of graphene: lithium iron phosphate after reduction is about 1:4), and graphene-based flexi...

Embodiment 3

[0053] 1) With 50 mesh expanded graphite as raw material, large-size graphene oxide is prepared by the Hummers method;

[0054] 2) Take 11.2mg of silicon nanoparticles (particle size about 200nm), put them into a weighing bottle, add 3mL of 4.915mg / mL graphene oxide solution, stir magnetically for 2 hours and place in an ultrasonic cleaner for ultrasonic dispersion for 30 minutes to make it well mixed;

[0055] 3) Pour the product of step 2) into a petri dish with a diameter of 55 mm, and freeze-dry to obtain a round cake-shaped airgel;

[0056] 4) Press the product obtained in step 3) into thin slices with a pressure of 40 MPa with a hydraulic press, and cut it into small discs with a diameter of 12 mm with a slicer;

[0057] 5) The product obtained in step 4) is calcined and reduced in a tube furnace at 600° C. for 3 hours in an argon protective atmosphere (the mass ratio of graphene:silicon after reduction is about 1:2), and a graphene-based flexible silicon electrode is o...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
tensile stressaaaaaaaaaa
current efficiencyaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for preparation of a flexible self-support electrode with graphene as a conductive binder and an electrode. The preparation method includes: firstly mixing a grapheneoxide solution with an electrode active material evenly to obtain a mixed slurry; then drying the mixed slurry to obtain a three-dimensional aerogel; then molding the three-dimensional aerogel; and then conducting high-temperature calcination under gas protection so as to obtain the flexible self-support electrode. Compared with the prior art, the method provided by the invention uses graphene toreplace the conductive agent, binder and current collector used in the traditional electrode, and acquires a good flexibility self-support electrode film, which can be applicable to a variety of active materials and solution systems, and has great application prospects in batteries, supercapacitors and other energy storage systems or other functional composite material fields.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy storage and composite material preparation, and relates to a method for preparing a flexible self-supporting electrode using graphene as a conductive binder and the electrode. Background technique [0002] Electrodes are crucial to the performance of energy storage devices. The active materials of traditional electrodes are basically in the form of powder or dispersed liquid. When preparing traditional electrodes, the active materials are mixed with conductive agents and binders to form a slurry and coated on On the current collector, an electrode can be formed. However, since the binder is a polymer, the presence of these polymer binders will affect the electronic conductivity and impair the electrochemical performance of the active material; the current collector usually requires the use of expensive metal thin films. Therefore, in traditional electrodes, the addition of conducti...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/139H01G11/22H01G11/86
CPCH01G11/22H01G11/86H01M4/139H01M4/621H01M4/625Y02E60/10Y02E60/13
Inventor 杨晓伟周怡王嘉赫张润婧
Owner TONGJI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products