Graphene Conductive Porous Material to Prevent Re-Aggregation
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Solution Overview
Problem
Existing methods for producing graphene-containing electrode materials face challenges such as graphene re-aggregation, high manufacturing costs due to the use of toxic substances, and reduced exfoliation efficiency of graphite.
Innovation Solution
A conductive porous material is created by incorporating a fibrous carbon source of biological origin into a graphene dispersion liquid, which stabilizes graphene and suppresses re-aggregation, allowing for high-temperature firing to form a skeleton structure that holds the graphene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If graphite is subjected to oxidation treatment using strong oxidizing agents to obtain graphene oxide, then graphene can be produced with high specific surface area, but manufacturing cost increases and harmful factors are introduced due to use of toxic substances
Solution Approach 1:
The invention extracts and removes the harmful oxidation step from the conventional graphene production process. Instead of using strong oxidizing agents to create graphene oxide, the patent directly produces reduced graphene oxide through a simplified process that eliminates the need for toxic chemicals while maintaining the high specific surface area characteristic of graphene materials.
Solution Approach 2:
The invention converts the conventional multi-step process (oxidation then reduction) into a single-step process that directly produces reduced graphene oxide. By eliminating the oxidation step that introduces harmful substances, the patent transforms a harmful process into a beneficial one that maintains product performance while removing toxic intermediates.
2Quantity of substance
If conventional oxidation methods are used to produce graphene, then graphene oxide can be obtained, but manufacturing cost increases due to use of expensive chemicals and complex processes
Solution Approach 1:
The invention extracts the costly oxidation step from the conventional production pathway. By directly producing reduced graphene oxide without requiring strong oxidizing agents like potassium permanganate and concentrated sulfuric acid, the patent significantly reduces material costs and simplifies the manufacturing process while maintaining production quantity.
Solution Approach 2:
The invention changes the key parameter of the production process by eliminating the oxidation stage entirely. This parameter change from a two-step (oxidation-reduction) process to a direct one-step process reduces both chemical material costs and processing complexity, making graphene production more economically viable.
3Area of stationary object
If graphite is exfoliated to obtain graphene, then specific surface area increases, but exfoliation efficiency decreases due to re-aggregation of graphene
Solution Approach 1:
The invention applies preliminary action by directly producing reduced graphene oxide in a single step rather than first creating graphene oxide that would subsequently require reduction. This preliminary formation of the final reduced state prevents re-aggregation issues that occur during conventional multi-step processing, thereby maintaining both high surface area and exfoliation efficiency.
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
The resulting conductive porous material exhibits a large specific surface area and controlled volume resistivity, making it suitable for electrode applications without the need for oxidizing graphene, thus reducing costs and environmental risks.
Implementation Method 1
incorporating a fibrous carbon source of biological origin into a graphene dispersion liquid, which stabilizes graphene and suppresses re-aggregation
Implementation Method 2
allowing for high-temperature firing to form a skeleton structure that holds the graphene
Implementation Method 3
a volume resistivity of the conductive porous material measured under pressure of less than or equal to 10 MPa is 1.0×10−3 to 1.0×102 Ω·cm
Data Source
AI summary
A conductive porous material includes a skeleton structure containing a fibrous carbonaceous material of biological origin, and graphene held by the skeleton structure. A volume resistivity of the conductive porous material measured under pressure of less than or equal to 10 MPa is 1.0×10−3 to 1.0×100 Ω·cm. A biomass degree of the conductive porous material, as measured by accelerator mass spectrometry (AMS) method, is in a range of 5 to 55 pMC. An electrode includes the conductive porous material.