Graphene Production via Salt-Mediated Graphite Intercalation
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Solution Overview
Problem
Current methods for producing graphene are often expensive, complex, and dangerous, with high temperatures causing damage and incomplete removal of oxygen atoms, leading to low-quality graphene production, especially in scalable and flexible electronic device applications.
Innovation Solution
A method using alkaline metal or alkaline earth metal salts to form a graphite intercalation compound at a low temperature, avoiding direct use of reactive metals and oxygen-containing salts to produce high-quality graphene without oxidation, enabling mass production of scalable and high-quality graphene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high temperature processes (700°C or higher) are used for graphene production, then graphene can be produced in quantity, but the graphene may be damaged and production cost increases greatly
Solution Approach 1:
The patent changes the temperature parameter from high temperature (700°C or higher) to low temperature (below 700°C) process conditions. This parameter change enables graphene production while avoiding thermal damage to the graphene structure, thus resolving the contradiction between productivity and manufacturing precision.
Solution Approach 2:
The patent utilizes phase transition of the intercalant material (from solid to liquid state at melting point) to enable the intercalation process at low temperatures. The intercalant melts and penetrates between graphite layers, achieving graphene production without high temperature damage.
2Reliability
If alkaline metals or alkaline earth metals are directly used to form graphite intercalation compound, then the compound can be formed effectively, but the process becomes dangerous due to high reactivity and explosiveness
Solution Approach 1:
The patent introduces an intermediary substance (salt containing alkaline metal ion or alkaline earth metal ion) that mediates the formation of graphite intercalation compound. Instead of using highly reactive metals directly, the salt serves as a safe intermediary that releases the metal ion gradually, maintaining effectiveness while eliminating safety hazards.
Solution Approach 2:
The patent replaces expensive and dangerous alkaline metals with inexpensive and safe salt compounds. The salt is consumed in the process to form the GIC, serving as a disposable intermediary that eliminates ongoing safety concerns associated with storing and handling reactive metals.
3Ease of operation
If oxygen-containing salts are used in the production process, then the salt can be handled safely, but oxygen atoms are not fully removed leading to low-quality graphene
Solution Approach 1:
The patent extracts and removes oxygen atoms from the final graphene product through a reduction process. After the GIC is formed using safe salts, the intercalant is removed and oxygen atoms are extracted, leaving high-quality graphene without compromising the safety benefits of using non-oxygenous salts in the production process.
4Productivity
If conventional methods are used to produce graphene, then production can proceed, but the process is expensive and complex
Solution Approach 1:
The patent employs inexpensive salt compounds as intermediaries that are consumed in the process to form GIC. This replaces expensive catalysts and complex equipment required by conventional methods, simplifying the overall process while maintaining production capability.
Solution Approach 2:
The patent replaces complex mechanical and thermal processing systems with a chemical intercalation process using salt intermediaries. This substitution simplifies the production methodology, reducing equipment requirements and process complexity while achieving effective graphene production.
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 approach results in a safe, cost-effective, and efficient process for producing high-quality graphene at low temperatures, reducing the risk of damage and ensuring high-quality graphene with minimal oxygen content, suitable for commercialization and flexible electronic devices.
Implementation Method 1
inserting alkaline metal ions or alkaline earth metal ions generated by melting the salt mixture in intercalation of the graphite so as to increase an interval between layers of the graphite and to separate the layers of the graphite from each other
Implementation Method 2
heating the mixture at a eutectic point of the salt mixture or more so as to melt the salt mixture
Implementation Method 3
heating the mixture at a eutectic point of the salt mixture or more so as to melt the salt mixture; obtaining alkaline metal ions or alkaline earth metal ions generated by melting the salt mixture
Data Source
AI summary
The present invention relates a method for producing a graphite intercalation compound (GIC) and to the production of graphene using the same. The method of the present invention comprises the following steps: (a) obtaining alkaline metals or alkaline metal ions, or alkaline earth metals or alkaline metal ions, from alkaline metal salts or alkaline earth metal salts; (b) forming a graphite intercalation compound using the alkaline metals or alkaline metal ions, or the alkaline earth metals or alkaline earth metal ions; and (c) dispersing the graphite intercalation compound so as to obtain graphene. As the method of the present invention uses salts which are inexpensive and safe, graphite intercalation compounds can be easily produced at a low cost, and the graphene can be obtained from the thus-produced compounds, thereby reducing the costs of producing the graphene and enabling the easy mass production of the graphene.