Graphene Production via Ultra-High Pressure Exfoliation

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Solution Overview

Problem

Current methods for producing graphene from graphite materials face limitations such as low yield, high-defect density, and difficulty in achieving high electrical conductivity and uniformity, often requiring complex processes, toxic chemicals, and high temperatures.

Innovation Solution

A method involving dispersing graphite in a solution and subjecting it to ultra-high pressure (at least 800 bar) and low temperature (no more than 30°C) without the use of chemical reagents or sonication, using an ultra-high pressure reactor to exfoliate the graphite and produce graphene with controlled particle size and thickness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional methods are used to produce graphene, then production can be achieved, but the yield is low and defect density is high

Engineering Contradiction:

Improvegraphene production yieldVSAvoidgraphene purity and defect density

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The invention changes the physical parameters of the graphite material by applying ultra-high pressure (at least 800 bar) and controlled temperature (no more than 30°C) to transform the graphite structure into graphene. This parameter-based transformation enables high-yield production while maintaining low defect density, resolving the contradiction between productivity and manufacturing precision.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention replaces chemical methods (oxidation, reduction, use of toxic chemicals) with a mechanical/physical approach using ultra-high pressure and low temperature. This substitution eliminates the need for complex chemical processes that typically introduce defects, thereby improving both yield and purity simultaneously.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of manufacture

If chemical reagents and high temperatures are used, then graphene can be produced, but the process becomes complex and costly

Engineering Contradiction:

Improveproduction process simplicityVSAvoidprocess complexity and equipment requirements

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The invention replaces complex chemical processes with a simpler physical process involving ultra-high pressure and low temperature treatment. This substitution eliminates the need for multiple chemical reagents, oxidation steps, and high-temperature equipment, thereby simplifying the manufacturing process and reducing equipment complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention uses a solution (water or organic solvent) as a temporary medium that can be easily removed, replacing the need for expensive and complex chemical reagents. The solution serves its purpose during the exfoliation process and is then discarded, simplifying the overall process and reducing costs.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If sonication and chemical reagents are used, then graphene exfoliation can be achieved, but electrical conductivity and uniformity are compromised

Engineering Contradiction:

Improveelectrical conductivity and uniformityVSAvoiddefect density in graphene

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The invention replaces sonication (acoustic energy) with ultra-high pressure mechanical energy to achieve exfoliation. This substitution prevents the formation of defects that typically occur during sonication, thereby maintaining high electrical conductivity and uniformity in the produced graphene.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention converts the harmful effect of strong interlayer forces in graphite into a beneficial process by using ultra-high pressure to overcome these forces and achieve controlled exfoliation. The pressure that would normally compress graphite is instead used to separate layers cleanly, producing high-quality graphene with minimal defects.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This method results in graphene with low-defect density and high uniformity, achieving efficient production with improved electrical conductivity and mechanical properties, as demonstrated by Raman spectroscopy and particle size analysis.

Implementation Method 1

subjecting the graphite suspension at a pressure of at least 800 bar and a temperature no more than 30° C.

Methodology Applied

Scientific EffectUltra-high pressure: Pressure Increase

Implementation Method 2

shearing and exfoliating the graphite material to produce a graphene-containing solution

Methodology Applied

Scientific EffectShear stress: Shear Stress

Data Source

PatentUS10273159B2Method of producing graphene

Publication Date: 2019.04.30 CHUNG YUAN CHRISTIAN UNIVERSITY

AI summary

Disclosed herein is a method of producing a graphene from a graphite material. The method comprises the step of dispersing the graphite material in a solution, followed by shearing and exfoliating the graphite material produce a graphene-containing solution. The present method does not involve the use of chemical reagent and/or sonication treatment.