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

Small-sheet-diameter graphene powder, graphene conductive paste, preparation method of graphene conductive paste, and application

A technology of graphene powder and conductive paste, which is applied in the field of graphene, can solve the problems of difficulty in realizing industrialized production and popularization and application, difficulty in optimizing the energy density of ternary batteries, and insignificant graphene characteristics, etc., so as to be suitable for industrialization Promotion and application, low cost, easy to control the effect

Pending Publication Date: 2021-06-18
HAIKE GRP RES INST OF INNOVATION & TECH
View PDF6 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although graphene has excellent performance, in practical applications, graphene still has many problems and restrictive factors. As far as its preparation method is concerned, the graphene prepared by the existing physical exfoliation method has thicker sheets. The characteristics of graphene are not significant, and as a lithium-ion battery additive, it is difficult to optimize the energy density of the ternary battery under the condition of a small amount of addition
Graphene prepared by redox, although the sheet is thinner, has poor electrical conductivity, which seriously affects battery performance.
The laboratory-level CVD preparation process is too cumbersome and the conditions are harsh, which affects production efficiency and is difficult to achieve large-scale industrial production and popularization and application

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
  • Small-sheet-diameter graphene powder, graphene conductive paste, preparation method of graphene conductive paste, and application
  • Small-sheet-diameter graphene powder, graphene conductive paste, preparation method of graphene conductive paste, and application
  • Small-sheet-diameter graphene powder, graphene conductive paste, preparation method of graphene conductive paste, and application

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0070] The present invention also provides a kind of preparation method of graphene powder, comprises the following steps:

[0071] 1) Under the condition of airtight pressure, the graphite is immersed in the supercritical fluid and mixed to obtain the supercritical state mixed liquid;

[0072] 2) After pressurizing the supercritical mixed liquid obtained in the above steps, the graphene powder is obtained after being sprayed and peeled off through a slit.

[0073] The present invention can correspond to the parameters, selection of raw materials and products in the above-mentioned preparation method, and the corresponding optimization principles, and the parameters, selection, and corresponding optimization principles of the raw materials and products in the aforementioned graphene powder. Let me repeat them one by one. The specific process and parameter control in the preparation method of the present invention, and its corresponding optimization principle and the specific ...

Embodiment 1

[0102] Grind 10g of graphite powder with a jet mill for 5 minutes for homogenization to obtain graphite powder with a particle size of 2-4μm, and put the powder into 1L of supercritical CO 2 Soak in the fluid, after 800r / min high-speed stirring, soak for 0.5h, pressurize to 100MPa high-pressure slit peeling, and collect graphene powder with filter cloth.

[0103] The graphene powder prepared in Example 1 of the present invention was characterized.

[0104] see figure 1 , figure 1 It is the SEM scanning electron micrograph of the graphene powder prepared in Example 1 of the present invention.

[0105] Depend on figure 1 It can be seen that in the graphene powder prepared by the present invention, the graphene sheet diameter is small, the size is about 600nm, and the sheet thickness is thin.

[0106] After the graphene powder, PVDF and NMP are mixed, they are homogenized and dispersed by a 70MPa high-pressure homogenizer for 30 minutes to obtain a nano-graphene conductive pa...

Embodiment 2

[0131] Grind 10g of graphite powder with a jet mill for 5 minutes for homogenization to obtain graphite powder with a particle size of 2-4μm, and put the powder into 1L of supercritical CO 2 Soak in the fluid, stir at 1000r / min at high speed, soak for 1 hour, pressurize to 100MPa and peel off the high-pressure slit, and collect the graphene powder with filter cloth.

[0132] The graphene powder prepared in Example 2 of the present invention was characterized.

[0133] see image 3 , image 3 SEM scanning electron micrograph of the graphene powder prepared in Example 2 of the present invention.

[0134] Depend on image 3 It can be seen that in the graphene powder prepared by the present invention, the graphene sheet diameter is small, the size is about 500nm, and the sheet thickness is thin.

[0135] After the graphene powder, PVDF and NMP are mixed, they are homogenized and dispersed by a 70MPa high-pressure homogenizer for 30 minutes to obtain a nano-graphene conductive ...

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
particle diameteraaaaaaaaaa
lengthaaaaaaaaaa
widthaaaaaaaaaa
Login to View More

Abstract

The invention provides graphene powder. The graphene powder is obtained by conducting slit spraying stripping on graphite through a supercritical fluid. According to the invention, graphene with relatively thin thickness and relatively small sheet diameter can be prepared under the conditions of low cost and no pollution through a supercritical liquid phase narrow hole stripping technology, so that the graphene can be uniformly dispersed in an oil phase or a water phase subsequently, and the small-sheet-diameter graphene conductive paste for a lithium ion battery is prepared. According to the small-sheet-diameter graphene conductive paste provided by the invention, graphene nanocrystallization can be realized, electronic conductance can be improved as far as possible, ion resistance can be reduced, and on the premise of ensuring battery performance, the dosage of a conductive agent can be reduced as far as possible, the dosage of active substances can be improved, and the energy density of a battery can be increased as far as possible. The preparation method is low in cost, mild and pollution-free in condition, easy to control and more suitable for industrial popularization and application.

Description

technical field [0001] The invention belongs to the technical field of graphene, and relates to a graphene powder, a graphene conductive paste and a preparation method and application thereof, in particular to a small-diameter graphene powder, a graphene conductive paste, a preparation method and an application thereof . Background technique [0002] Graphene is a new material with a single-layer sheet structure composed of carbon atoms. It is a carbon atom with sp 2 The hybridized orbitals form a hexagonal planar film with a honeycomb lattice, a two-dimensional material with a thickness of only one carbon atom. Since Geim et al first prepared graphene by micromechanical exfoliation method in 2004, graphene has attracted widespread attention because of its excellent properties such as high conductivity, high specific surface area, high strength and high electron mobility. In turn, it also promotes the rapid development of graphene preparation technology. It is precisely ...

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): C01B32/19C01B32/194H01M4/62H01M10/0525
CPCC01B32/19C01B32/194H01M10/625H01M10/0525C01B2204/04C01B2204/32Y02P20/54Y02E60/10
Inventor 杨亚东吴炳辉
Owner HAIKE GRP RES INST OF INNOVATION & TECH
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

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com