Graphene with large flake diameter and high conductivity and preparation method thereof

Through the method of treating graphene by static expansion and peeling, the problems of structural failure and high energy consumption in the existing graphene preparation process are solved, and the preparation of large-size high-conductive graphene is realized, which has improved its application prospects.

CN119683610APending Publication Date: 2025-03-25SOUTHWEAT UNIV OF SCI & TECH
3 Cites 0 Cited by

Patent Information

Application Number
CN202510155206.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2022-06-21
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

In the existing graphene preparation methods, redox method leads to damage to the graphene structure and affects the conductivity; the expanded graphite process produced in industrial production is complex, has high energy consumption, and has great environmental hazards, and has large water consumption in cleaning and uneven expansion, which damages the graphene structure.

Method used

A mixture of graphite, concentrated sulfuric acid and expansion agent is used for static expansion reaction, followed by adding a peeling additive for peeling treatment to obtain large-size highly conductive graphene. This method has no oxide intercalation, simple process, low energy consumption and environmental protection.

Benefits of technology

The preparation of large-size graphene has been achieved, with low structural damage, few defects, and significantly improved conductivity, which is suitable for a wide range of application prospects.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention provides graphene with large flake diameter and high conductivity and a preparation method thereof, the preparation method comprises the following steps: adding graphite, concentrated sulfuric acid and an expanding agent into a reaction container according to a ratio of 1: (3-12): (10-30) g / ml / g, and uniformly stirring and mixing to obtain a fluffy graphite mixture containing the concentrated sulfuric acid and the expanding agent; carrying out static expansion reaction on the fluffy graphite mixture at a preset temperature for a preset time to obtain coarse expanded graphite with a high expansion rate; adding a stripping aid into the coarse expanded graphite with the high expansion rate, and performing stripping treatment to obtain a coarse graphene suspension with a large flake diameter; settling and separating the crude large-flake-diameter graphene suspension to obtain a refined large-flake-diameter graphene dispersion liquid; and filtering, washing and drying the large-sheet-diameter refined graphene dispersion liquid to obtain the large-sheet-diameter high-conductivity graphene. The preparation method has the advantages of simple preparation process flow, mild reaction, low energy consumption, environmental protection, large sheet diameter of the prepared graphene, excellent conductivity and the like.
Need to check novelty before this filing date? Find Prior Art